Tag Archives: (tr)uSDX

Field Reports, FT8, Guest Posts, News, Portable, POTA, QRP, SSB, Travel

Navigating Quetico: Rod’s POTA Adventure with the (tr)uSDX

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Many thanks to Rod (VA3MZD) for sharing the following guest post:

Operating POTA from the interior of Quetico Provincial Park CA-0359 with a (tr)uSDX

By Rod Murray (VA3MZD)

In a previous guest post here on QRPer I gave a brief history of my introduction to Ham radio and specifically POTA and my experiences activating local parks by bicycle. My initial excitement about POTA was inspired by the YouTube channels of some noteworthy field operators, Tracy VE3TWM, Julian OH8STN, Adam K6ARK, Stuart VE9CF, and Thomas K4SWL of course, just to name a few.

Tracy VE3TWM’s experiences on a canoe trip to Algonquin Provincial Park, Ontario, a place he and I know well (although we’ve never met) were particularly inspirational. In this video from 2021 Tracey activated Algonquin Provincial Park CA-0138 from a lake that I’d previously paddled to on a canoe trip. I wanted to do that too! But it would take quite a while. Let me tell you.

In 2022, with my regular paddling buddy Tom, we planned to take our wives to one of the premier canoe tripping parks in North America that we’d never visited.  We’ve been paddling together since we were teenagers at an Ontario summer camp and had been taking our partners along on canoe trips for over 30 years.

Quetico Provincial Park in North Western Ontario, Canada, one of the province’s crown jewels, stands as a legendary wilderness area that can only be accessed by canoe or kayak in summer and ski or snowshoe in winter, with one exception. There is one road accessible campground and visitor centre in the park’s northeast corner. The Park, which is over 4700 square kilometres, is also surrounded by thousands more square kilometres of wilderness public land, known in Canada as “Crown land.” Numerous First Nation communities are also adjacent to the Park.

To the south is the equally famous Boundary Waters Canoe Area in Minnesota, USA. Indeed, one can start a canoe trip in one country and finish in another, or paddle a route along the International Boundary (hence the name!), crossing the border numerous times as you go, with the required documentation of course.

Location of Quetico Park, Ontario,The Boundary Waters, MN, and Algonquin Park, Ontario in North America from ottertooth.com

We had a successful trip to Quetico in 2022 and I vowed to return when the opportunity arose. Meanwhile, I’d since become very active in POTA, and was more determined to complete a POTA activation from a wilderness park while on a canoe trip.

Quetico Park close up map from the Ontario Parks Master Plan

That determination was finally put in motion in early 2024 when another Quetico canoe trip was planned for August. But the challenge would be to put together a radio, an antenna and battery light enough and compact enough to pack in a canoe trip barrel.

Canoe Trip Barrels and Waterproof Eureka Pack ready to go!

Our plan was to enter the Park at one of the north east access points, travel south across immense Pickerel Lake, then paddle and portage our way as far as Fern or Olifaunt Lakes, depending on our progress and the weather, and return via the same route. Or, if we were feeling adventurous, to complete the circle route made possible by the historic Deux Rivière and Pine Portages. See Map below:

Canoe Route across Pickerel Lake into Bud and Fern Lakes with Start, Campsites and Portages marked and possible Circle Route

Either way would require 8 portages totalling more than 7 km. Everything has to be small and light because a portage is a rugged trail between lakes where you must carry everything on your back.

Because my wife and I have four packs in total for a 10 day trip, plus the canoe, each portage must be walked 3 or more times, back and forth, until all the gear is carried over. Incoming History lesson: From my university days as a researcher for the Kanawa Canoe Museum, now the Canadian Canoe Museum in Peterborough, Ontario, I learned that “portager” is a French verb that translates “to carry” and has its origins with the French Voyageurs who paddled the continent trading furs. Therefore “portage” should always be pronounced in French.

At 67 years young, I now own a Swift Kevlar canoe that weighs under 14 kg, about 30 pounds. The food and equipment barrels are about 20kg each. I wasn’t about to pack or portage much more in the form of radio equipment. It had to be light!

It so happened that a new member of my club, the Elmira Radio Club of Ontario, Hagen VE3QVY, had recently built a (tr)uSDX radio. The radio is a masterpiece of miniature hardware and brilliant software thanks to Manuel DL2MAN and Guido PE1NNZ.

Hagen is an electronics whiz, to say the least, and he knew of my interest in this radio (I was on the original list for the Canada group kit build). He lent me his (tr)uSDX back in April and after making an easy trans-Atlantic QSO with it on 5W, I immediately ordered a Classic band kit. I was already thinking about activating Quetico from the park’s interior when I started my build.

My (tr)uSDX build in progress

Hagen offered considerable help with my (tr)uSDX since the last time I built a kit was in 1970 when I worked on a Heathkit SW receiver I got for Christmas. Hagen installed some improved MOSFETS, precisely rewound all the toroids, tested and improved the radio’s performance and measured all the specifications, to the point where the radio was transmitting a minimum 5W on all bands with very high efficiency. And it only weighed 150 grams, perfect for my needs!

It was time to gather the necessary accessories to complete this rig keeping it lightweight and portable. I added a short length of thin RJ-316 BNC coax to my kit and included the high performance Tim Ortiz N9SAB Nano QRP 20m dipole that I’d been using for POTA with my FT-818. At only 100 grams and a reliable performer, it would fit the bill, but limit my operation to 20m.

I already had a small Bioenno 3Ah battery that could power the radio through more than a few activations, which added another 400 grams. With a few extra accessories and cables and a N6ARA mini paddle, just in case (I’ve never made a CW contact but might try if needed) my lightweight kit was well under 1 kg and complete. The rig and accessories easily fit inside the soft pouch with my fishing reels, so no extra space was required.

I started to think about how I could get spotted while in the wilderness far away from any cell towers. Perhaps, I thought, if I could add a few FT8 contacts while in the Park I could surely make 10 QSOs to confirm an activation without a spot on POTA.app. I solved the spotting quandary for an SSB activation after much deliberation.

I also tested a number of mobile phone apps that run FT8. I tried both iOS and Android apps and settled on FT8CN for Android. After updating the (tr)uSDX firmware to run CAT and audio through a single USB cable to an Android phone, I gathered a few of the USB micro to USB-C cables needed to connect the radio to a phone running the FT8CN App. Eventually, after considerable trial and error, it all worked! To be clear, the FT8CN software has a bit of a learning curve, but that is another story. It works well with some practice.

In early August, the barrels were packed and ready to go. After two full days of driving north and west 1500 km on the Trans-Canada Highway from our QTH in South Western Ontario, we arrived at Quetico Provincial Park. Yes, the province of Ontario is that big!

Map of Ontario showing the 1500 km driving route to Quetico from SW Ontario

We camped overnight at the Park’s Dawson Trail campground and set off on our canoe trip the following morning crossing the expanse of Pickerel Lake in breezy, warm, pleasant summer weather. A few open stretches of the lake required that we paddle behind islands to avoid the bigger waves. But all that would change, dramatically.

Continue reading Navigating Quetico: Rod’s POTA Adventure with the (tr)uSDX →

Field Reports, Guest Posts, News, Portable, POTA, QRP

Climbing an old hill and struggling to get ten in the logs!

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by Anthony (M7TAW)

Introduction

After the success that was my first ever activations at Devil’s Punch Bowl, I’d earmarked another close by POTA spot for my second activation.

This one had an unusually low number of activations, given the local activity in surrounding parks. I just figured maybe it’s a bit out the way and a smaller area, slightly less popular. There can’t be another reason, right…right?

Only a few activations at this park, but G7SQW (pota.app) had a good one!

Old Winchester Hill National Nature Reserve (GB-0029)

Old Winchester Hill is a 164-acre nature reserve, with an Iron Age hill fort at the summit of its largest hill. Interestingly when checking out the location I did spot the phrase “Some unexploded Ordnance may still remain in ‘fenced-off’ sections of the hill” as the hill was used as target practice back in WW2. Watch where you’re walking then!

History buffs delight. An iron age hill fort!

Gear

The radio gear list was basically the same as my last activation apart from throwing in the Baofeng, so I just had to grab the already filled backpack again, and not have to think about it too much!

The only thing I did check was that the batteries were fully charged. I’ve seen a couple of videos of people mentioning running out of battery on an activation Lee – MØVKR!  Also I decided that I’d also bring a camping chair, which wound up being a bit hefty to carry and not very useful in the end…more on that later.

A full list of gear and links below.

Setting up

The presence of a dedicated car park is a definite plus, especially for visitors who may not be familiar with driving on narrow UK country roads. Finding suitable parking near some parks can be a challenge, so having a designated parking area makes access much easier!

After having parked up, I donned my cap and grabbed my back and the chair. The day was warm, and the sun was out. It was a glorious day, but I’d forgotten one thing…it wasn’t radio related but you’ll see the consequences of that later.

I set off down the path and was greeted by a lovely view, and a fork in the path. Do I go left or right?

In a poor choose your own adventure, I chose right and realised about half way down a huge hill that I’d chosen incorrectly. What is this SOTA?!

I was carrying my backpack, a camping chair, and a huge bottle of water. The amount of vegetation and the incline of where I was walking meant I didn’t particularly feel good about setting up anywhere. So on I trod.

The heat was exhausting and the terrain was a little tricky. I then had to get through a pretty overgrown forested area.

The route so far.

What goes down…must also come up? Whatever…I was panting and I broke through the forested area to be greeted with this hill.

Deceptively tiring.

I have to say, looking at the image now it doesn’t look that bad, but at the time it felt horrendous. There were other people struggling getting up, and the heat didn’t help! I calculated the incline afterwards using google earth and it turns out it’s about 16 degrees, or roughly 25% grade.

In either case, I can see why this park has so few activations. It’s a bit of a slog to get up and down, and there aren’t many great spots to activate.

Thankfully, after I got to the top of the hill, I found a nice looking bench, which turned out to be a fairly precariously balanced bit of wood on top of some sort of water trough. I didn’t care though, I’d found a spot to sit down.

The spot for the day.

I’d spent a bit of time practicing setting up the antenna for both 20m and 40m at home using a wider range display on the NanoVNA which really helped. I could setup quickly, and boy after the walk that was helpful!

I’m loving this antenna for it’s quick setup and ease of being pretty discreet.

I found that for 20m I really needed to spread the radials out to get a good SWR. 40m tended to find a low SWR with just the radials lengthened out together. Not really that much trouble!

All setup and ready to go!

On The Air

Before I started, I actually pulled out my Baofeng this time, and tried to give a few calls out to no avail. I coordinated with a fellow Online Amateur Radio Community (oarc.uk) member over on Discord, and whilst we couldn’t make a straight line QSO, we did manage to chat via a repeater (which doesn’t count for POTA).

This time, I prioritised CW, and with my low SWR and nice spot high up on a hill, I thought I’d be getting out and getting calls in in no time. That great ball in the sky had other ideas though.

After setting my spot on the website, I called CQ on 40m for about 10 mins and noticed I wasn’t even getting heard on the RBN. I gave it another 5 minutes of trying and thought, “damn, maybe I’ll switch to 20m.”

A quick slide on the coil and adjustment of the whip and I’m on 20m. Okay, CQ again…nothing still. I tried moving about the frequencies a little but still nothing on the RBN and no calls coming in. That’s frustrating, I was really looking forward to some CW.

Okay let’s change tact, and go with FT8. Again, the (tr)uSDX is pretty handy for this as I can just plug directly into my phone via USB and boot up FT8CN and that’s that…I’m working FT8.

I tried on 40m first, and I found HB9XQH (pota.app) who was also POTA at that time! My first P2P, that seems like a good start!

It was another 6 minutes to get the next QSO with PA3CPS, immediately followed by M6BLV (pota.app). Then nothing for a good 15 minutes on 40m. Drat!

I then switched to 20m. My friend from the first activation came back this time DK5UR (pota.app), then followed EA7HTE (pota.app), and quickly SP1JQJ, and also OH1NOA (pota.app). Phew! At least it looks like I’ll be getting my 10 (foreshadowing).

At least there were some nice views to pass the time.

I then spent another hour working both 20m and 40m, FT8 and CW to no avail. I didn’t seem to either be getting out much, or anybody coming in. I had a couple of sniffs of a QSO on FT8 but they didn’t complete.

Finally, I got M0PTZ (pota.app) after this hour, but the day had gone on about 3 hours now, and I was starting to get too hot and tired. That was only 8 in the log, and it felt super frustrating to only be 2 away, but I needed to get back and I had to come up with the energy to make my way back up the hill!

After the high of the first activation, to go to a low of not being successful was disheartening, but it shall not dissuade me from future attempts! Just maybe I’ll give this old hill a miss for a while.

Oh, and also that thing that I forgot? Sunscreen…don’t forget that or you’ll end up looking like I did.

A British confectionary representation of my skin colour palette the next day.

Where are those last 2 hiding?

73s

Anthony (M7TAW)

Field Reports, Guest Posts, News, Portable, POTA, QRP

Code, Contacts, and a Stunning View: A POTA First-Timer’s Experience at the Devil’s Punch Bowl

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Many thanks to Anthony (M7TAW) who shares the following guest post:

A first timer’s POTA activation at the Devil’s Punch Bowl!

Anthony (M7TAW)

Introduction

Let me start with the confession that I am an amateur radio operator born out of the Covid lockdown. With the switch to remote examinations by the RSGB in 2020, and a lot of free time on my hands, I thought why not get myself on the air! However, it wasn’t until this year, and a nice birthday gift from the fiancée, that I finally managed to reach into the HF bands with a (tr)uSDX.

This 5W QRP multiband and multi(ish) mode transceiver was going to be my first serious foray into what I deemed “proper radio”. So, I endeavoured to try and learn and maximise every bit of usage I could out of it. Like many newcomers to radio, I started with getting an EFHW strung out my window and got onto digital modes with FT8 on 20m just to confirm that I could in fact be heard. I also managed to SSB over to Italy at one point, though the in-built microphone gave me a 337 RST. At this point though, I was buzzing to be heard!

That’s USB covered, but what is this CW mode I can select?

As a graduate in history, there’s something about “old timey” technology and methods that intrigue me. Don’t get me wrong, I’m a technophile at heart (you kind of have to be a data scientist), but there’s something about post-industrial mechanical and electrical advancements that amazes me still!

Of course, morse code was going to be next on the list of things to explore then it seemed!

I ordered a cheap but decent key from our favourite Chinese marketplace, and started cramming LCWO, Morse Mania, and Morsle as much as I could, and getting that muscle memory rhythm with practicing sending the alphabet and my name. Luckily, the (tr)uSDX has a practice mode and a decent decoder in-built so I can just power the radio from a USB connection and practice away!

No better setup than practicing on the sofa in your pyjamas.

Naturally, the YouTube algorithm decided that if you’re learning about CW, you might also be interested in this POTA thing. A few K4SWL videos, a dash of K2EJT, and a splash of newcomer-encouraging KI7QCF, I was hooked. I could combine what I’d started learning, with equipment in the field, and also a slight competitive (I’m eyeing that top spot) and award-based activity.

I started obsessively watching POTA spots on Gridtracker to make sure I could hunt FT8 contacts, and also kept my eye on the spots for any CW contacts that I thought I’d be able to hear. Finally I did it; about 25 days after I seriously started learning CW, and with a bit of a crutch with the morse decoder on the radio, I finally made a POTA hunter CW QSO – DC5LY (pota.app) thank you very much.

As fun as hunting is, I had to follow the YouTubers I’d been watching and actually get out there for an activation. However, actually getting out there – shudders – in public and getting my antenna up seemed a daunting task. Add in the fact that I was determined to not rely on digital only to get an activation, but also CW.

I started to plan…

Firstly, I looked for sites that had decent parking, but were also probably big enough that I could tuck away uninterrupted (something to take the nerves away). Luckily for me, about 20 minutes up the road is a large stunning National Trust area known as The Devil’s Punch Bowl – the legend has it that the Devil scooped up a handful of earth and hurled it at Thor, God of Thunder, the depression that remained is the Devil’s Punch Bowl. Also, unluckily for me, I had to take a day off work to visit the dentist, so why not mitigate that by trying out my first activation!

Wealden Heaths SPA – Devil’s Punch Bowl Site of Significant Scientific Interest (GB-0243)

Devil’s Punch bowl – Surrey Hills National Landscape
GB-0243 Wealden Heaths SPA – Devil’s Punch Bowl Site of Significant Scientific Interest (pota.app)

Gear

When planning for this little adventure, I thought to myself that I’d likely panic if I had to combine putting up a mast for an EFHW or trying to throw a wire in the tree for the first time. Coupled with the fact that the (tr)uSDX doesn’t come with an ATU, I thought why not invest in a quick and easy vertical. After a bit of research, and another visit to our favourite Chinese marketplace, I opted for a JPC-12 vertical antenna along with an investment in a NanoVNA.

The (tr)uSDX comes with an inbuilt SWR meter but I wasn’t sure how reliable it was, and I’d have a hard time tuning with it. I grabbed some 18650 batteries and the stage was set! Helpfully, the JPC-12 antenna comes with a nice little carry case with supplementary space, and the compact size of the (tr)uSDX means I could just throw everything in there.

Full gear list and links below:

Setting up

I was up bright and early on a Friday morning, and headed over to the park slightly nervous, but also excited!

As a nervy POTA first timer, my original plan was to maybe just activate from the car park and hide my antenna behind my car. However, when I got there, it became very clear that there was nowhere to hide, and frankly there weren’t many great spots to plant a vertical in the ground.

I’d have to suck it up, and venture deeper into the park! After grabbing my backpack, and trotting down a marked route, I chose to go left onto a track that bikes weren’t allowed in the hope that it’d be quieter. Albeit the path was quite dense with overgrown bushes and plants. I was beginning to think I’d not have a clearing to even sit in, let alone mount the antenna.

What a view.

However, a couple of minutes later I chanced up a bench and table that was nestled slightly into the trees with a bit of a clearing! It was like the POTA gods had answered my calls for a perfect location. I quickly plonked my backpack on the table, claimed the spot, and started unpacking the gear. You can see below how efficient I’d been in packing, and I was surprised myself how I could get this antenna and all the equipment I’d need neatly into my bag.

Can’t recommend this antenna enough (with my limited experience)

A few minutes later, the vertical was up, and I’d got it tuned to 40m like I’d practiced at home. Helpfully, the loading coil has marked points which correspond to the bands, and all I had to do was slightly adjust the length of the whip whilst keeping an eye on the NanoVNA. I got it down to 1:1.18 around the CW bands for 40m in Europe (7000-7040MHz) – couldn’t be happier!

What a find for a first-time location!

On The Air

Part 1 – A job half done

Now came the exciting part! Finally getting on the air portable for the first time and POTA for the first time! I thought I’d settle my nerves by starting with the familiar FT8. I booted up FT8CN, and plugged the (tr)uSDX into the phone. A few firmware updates ago, the (tr)uSDX got audio over USB, and being able to plug it directly into the phone with a single cable and receive and send FT8 seems like magic to me. Continue reading Code, Contacts, and a Stunning View: A POTA First-Timer’s Experience at the Devil’s Punch Bowl →

Field Reports, Guest Posts, News, Portable, POTA, QRP, Travel

Joe’s Adirondack Adventure: POTA activations in the Independence River Wilderness

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Many thanks to Joe (N0LSD) who shares the following guest post:

Independence River Wilderness – Adirondacks, NY

by Joe (N0LSD)

A recent family engagement offered me the perfect opportunity to travel to a part of my state I rarely get the chance to visit.

This trip would be a single over-nighter, but allow for the activation of three POTA entities by hitting two different locations.  One stop would be a two-fer, while the other location would be a single-park activation.  Additionally, this trip would offer the potential for ‘late-shift’ contacts:  always a nice feature of overnight activations.

The Planning

In northern New York lies a vast, 6-million acre (over 2.4 million hectare) area that has been set-aside in the State’s constitution as protected land, and half of this area contains wildernesses that are meant to be kept ‘forever wild’.  This area, known as the Adirondack State Park, is fully 20% of the land area of the state of New York, and constitutes the largest area of state-protected land in the United States.

By way of comparison, one could fit Yellowstone, Grand Canyon, Yosemite, Everglades, and Great Smoky National Parks all within the Adirondack State Park boundary – at the same time.  (Wood-Tikchik State Park, in Alaska, has more *contiguous* protected land, at 1.6-million acres, and the Alaskan National Wildlife Refuge is the largest Federally-protected area.)

My goal was to probe the very western edge of this region.  Situated east-southeast of the town of Lowville, NY are two parks that straddle the Blue Line, which serves as the official border of the Adirondack Park itself.

To the west is the Independence River State Forest (POTA US-5067):  this park falls outside the Blue Line.  Bordering this park to the east is Independence River Wild State Forest (POTA US-10295) – which falls within the Blue Line, and thus within the border of the Adirondack Park (POTA US-2001).

My Amateur operations over the last number of years have been primarily utilizing digital modes; however, because the destination is a place I can seldom travel, and solar activity has been unkind to the HF bands as of late, I’d not leave anything to chance.

This meant having the ability to activate these parks via SSB Voice, if necessary.  I’ve been activating parks with the TruSDX, because it is a light-weight radio.  In addition to carrying this, however, I also took the Xeigu G90, and a Bioenno 12Ah battery.  A good bit of extra weight, but it provided a bit of insurance against the possibility of a failed activation attempt.

On Arrival

In Desert Solitaire, Edward Abbey, one of the great writers of the 20th Century, wrote, “In the first place you can’t see anything from a car; you’ve got to get out of the [G.D.] contraption and walk, better yet crawl, on hands and knees, over the sandstone and through the thornbush and cactus.  When traces of blood begin to mark your trail you’ll begin to see something, maybe.  Probably not.”

Map reconnaissance showed it would probably be feasible to drive through the Independence River State Forest park on a forestry road, then hike a couple miles further into the Independence River Wild State Forest along established trails to make camp on Little Otter Lake.  This would be my overnight location and first activation opportunity – a two-fer, as this place lies entirely within the Adirondack Park border.  This would put my vehicle at a midpoint between the two POTA entities.

I tend to pour over maps in preparation for trips like this, but I know better than to trust maps implicitly, especially in the wilderness.  A couple enterprising beavers can turn a whole forest into a pond; and a stroke of a pen in a far-away capital can make a road disappear back into the woods within a few short years.  Topology rarely changes, but what is on that topology can only be trusted once one sets eyes on it. Continue reading Joe’s Adirondack Adventure: POTA activations in the Independence River Wilderness →

Guest Posts, News, Portable, QRP, QRP Radios, Reviews

Bob takes a look at the (tr)uSDX

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Many thanks to Bob (K7ZB) for sharing the following guest post:

A CW Operator’s First Look at the (tr)uSDX by Malahit

by Bob Houf  (K7ZB)  

April 22, 2024 – Gilbert, AZ

I recently bought an assembled (tr)uSDX from Amazon.com [affiliate link] in April, 2024, the mainboard is version 1.2 and the RF board is version 1.0.

Due to antenna limitations – a 17-foot wire antenna with a 6-foot counterpoise hanging from a second-floor condo balcony, matched through a Tokyo Hi-Power antenna coupler for an SWR well below 2:1 – I’ve been operating exclusively on the 20-meter band.

A short coax run into the dining room has given me some great on-air time over the weekend, with good band conditions for 20-meter CW.

The radio powers up when 13VDC is applied and I quickly figured out the menu structure with the minimal documentation available from DL2MAN.

I’ve learned that the filter is best set to 500Hz and it is effective for the conditions, and as the band gets hot with all the various weekend contests, I drop in a little attenuation and soon the radio begins to sound good – actually, for the money, it sounds really good.

QSK set to ON allows my keyer in Iambic B to do a good job and I don’t miss any contacts which are forthcoming across the US from Oregon out to the East coast, on down to the Virgin Islands and then, quite a surprise, my Magnificent 7 Watts is heard for a choice contact with a VK2 down under.

I pound out contest QSO’s all up and down the band, adding in a few SOTA and POTA stations and very few have trouble copying me – I certainly had no problem copying weak signals from them.

I do notice that this is not a $1,500 transceiver, especially in the receiver performance, but for the price the satisfaction derived from effortlessly working CW makes up for any limitations.

During the MST contest, as I write this, stations were piled on top of each other. I found that tightening the filter down to 50Hz wasn’t ideal – 500Hz worked better for my ears. Signals filled the band from 14.030 to nearly 14.050, ranging from very weak to extremely strong. Thankfully, the well-behaved AGC prevented any ear-splitting surprises.

I also tested SSB mode briefly and it works and sounds good, though I’m unlikely to use it much myself.

Overall, this little gem is far from a toy. With its filters, AGC, attenuator, and fine-tuning, it should bring a smile to any CW operator’s face.

Articles, Digital Modes, Guest Posts, How To, News, QRP

Getting Started with HF Digital Modes (Without Breaking the Bank)

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Many thanks to Joe (N0LSD) who shares the following guest post:

Getting Started with HF Digital Modes – Without Breaking the Bank

by Joe (N0LSD)

Amateur radio can be an expensive hobby:  the reasons are myriad, made more difficult for newcomers because they tend to not have the experience to know what their requirements might be.  Brick-and-mortar stores where one might bounce ideas off knowledgeable staff, browse the aisles, and walk away with a suitable set-up are pretty few and far between.  Similarly, asking on various internet forums will often be met with, “It depends…” –followed by a wall of text filled with jargon and terminology that can be…intimidating.

For newcomers that maybe don’t have the time to invest in learning CW right off the hop, and perhaps get a bit of mic fright, digital modes such as FT8, JS8, and the like tend to be a great fit.  While “shack-in-a-box” solutions by the big-name manufacturers offer convenience, this convenience comes at a price that can be cost-prohibitive.

What follows is a QRP digital modes kit that I’ve experimented with over the last year.  No single piece of this kit cost more than US$150, and the entire kit can be had for under US$600.  What’s more, nearly everything can be purchased from Amazon.

We’ll start with the most expensive part of this kit:  the radio, which is the Tr(u)SDX.  It can be had on Amazon for US$138, and covers 20m, 30m, 40m, 60m, and 80m bands.  It is a quirky little radio with a sub-par speaker and a tiny little microphone.

The Tr(u)SDX is just about as bare-bones as one can get with an HF transceiver, and is decidedly a compromise.  However, unlike other ultra-compact transceivers, this one will do CW, it will do voice, and it will do *any* digital mode.  It can run on USB power at 1 watt output (micro-USB port on the side of the case); but it can also run on 12v (nominal) power via a 5.5mm x 2.1mm barrel connector on the top of the unit.

I’m powering this radio with a US$43 battery bank (Romoss Sense8P+), and a USB-C to 5.5 x 2.1mm cable (US$8.99) –both available on Amazon.  This battery bank will keep the Tr(u)SDX going for hours –long enough to do multiple POTA activations.  And, because there’s no special adapters, the battery bank can be re-charged in the same manner as a cell phone –or even off a small solar panel.

The sound card interface is the Digirig (US$57) with a US$19.97 cable that is TRRS 3.5mm on one end, and breaks out separate Mic and Speaker 3.5mm TRS.  Now, I will say that a recent firmware revision on the Tr(u)SDX has been demonstrated by the developers of the radio to allow for audio through the micro-USB connector of the radio – so the use of a sound card interface *may* be redundant.  However, in viewing the demonstration video for this, it seems rather dependent upon finding the right micro-USB to USB-A cable; with no clear indication on where one can obtain a cable that meets the specification.  Now, add a USB-C to USB-A or a USB-C to USB-C cable to interface with the computing device, and we’re in business!

So far we have a radio, power, and a way to get sound in and out of the radio.  Now, let’s talk about antennas.  Of course, one can homebrew an antenna for the cost of parts and time in construction and testing.  For the kit I’m using, I went with the N9SAB OCF Dipole –specifically because I do a lot of 80m QRP work.  Also available from N9SAB is a 6m-80m random-wire end-fed for US$89.99 from his eBay store.

If using a non-resonant antenna, an antenna tuner will be needed:  I went with the ATX-100 (US$126 from Amazon).  The reason I went with this is because it recharges with USB-C, which is consistent with everything else in this kit.

For coax, I personally use Times Microwave LMR-240 –a 50-foot length terminated in BNC is US$65 on Amazon.  For something less bulky, perhaps RG-316 from ABR Industries (abrind.com) might fit the bill  The ABR-240 coax at 50-feet in length is US$58.  For a jumper from the tuner to the radio, I use a 3ft RG316 cable from Amazon – which cost me US$13.99.

All that’s left is a device to run software…this can be a Raspberry Pi, or one’s laptop, certainly –however, these are bulky and require special power…and are a pain to re-charge easily.  Another solution is something one might already have:  an Android smartphone.  There are apps (some free, some paid) for RTTY, PSK31/63, WSPR, SSTV – these have been out for some time.  Additionally, one can do many of the modes contained in FLDigi, using the AndFLMsg app (not available on the Play Store –one has to download the .apk file from a 3rd party).  However, what I’ve been using –especially on POTA activations – is FT8CN.  This allows for full-function FT8 using just an Android phone –which can also be charged via USB-C.

[Note: eBay, Amazon and ABR links below are affiliate/partner and support QRPer.com at no cost to you]

Tr(u)SDX $138.00 Amazon
N9SAB Random Wire End-Fed $89.95 N9SAB eBay Store
ATU-100 Antenna Tuner $126.00 Amazon
RG316 Coax Jumper (3ft) $13.99 Amazon
USB-C to 5.5×2.1mm cable $8.99 Amazon
ABR-240 50 ft Coax $58.00 abrind.com
Romoss Sense8P+ Battery Bank $42.99 Amazon
DigiRig MobileSoundcard Interface $49.97 digirig.net/store
uSDX Cable for DigiRig Mobile $19.97 digirig.net/store
Total $547.86

This kit is –for sure– a compromise:  one isn’t going to bust pile-ups or win contests with it  However, for a “starter kit” that can easily be carried in a small backpack that can not only be used for HF digital modes, but also can do SSB voice and CW, it will at least get an operator on the air and enjoying the bands –without breaking the bank.

Field Radio Kits, News, Portable, QRP

Field Radio Kit Gallery: IW2EPE Pairs the (tr)uSDX with QRPguys Antennas

3 Comments

Many thanks to Luca (IW2EPE) who shares the following article about his portable field radio kit which will be featured on our Field Kit Gallery page. If you would like to share your field kit with the QRPer community, read this post.

My (tr)uSDX Field Radio Kit

by Luca (IW2EPE)

My POTA kit is assembled around the (tr)uSDX radio. I am a hunter and I have only been a fox this last summer but with poor results. However, I would like to try again with this kit because I think it can do it.


The weight of the kit is approximately 1kg.

The kit consists of:

  • Radio (tr)uSDX cw ssb capable of working on 20/17/15/12/10 m. I only use the 20m with 3w of power.
  • EFHW mini tuner antenna by QRPguys. This is a nice simple and efficient product.
  • QRPguys dummy load.
    3-cell 2200 maH lipo battery, type used in model aircraft.
  • 5v power bank to test the connection in wspr.
  • Sony headphones.
  • Homemade condenser microphone.
  • Homemade RF choke.
  • Smarthpone with some apps like FT8CN and wspr.
  • About 15m of 4mm nylon rope.

Lastly I also added the home-made DS1 antenna from QRPguys. This is my version and is not an original kit.

Digital Modes, Field Radio Kits, Guest Posts, News, Portable, POTA, QRP

Field Radio Kit Gallery: KI7URL’s (tr)USDx Ultralight Portable Kit

3 Comments

Many thanks to Jim (KI7URL) who shares the following article about his portable field radio kit which will be featured on our Field Kit Gallery page. If you would like to share your field kit with the QRPer community, read this post. Jim writes:

(tr)USDx Ultralight Portable Kit

by Jim (KI7URL)

I like to take amateur radio with me wherever I go. In my backpack, I keep a Yaesu FT-60 (powered by 18650 batteries, but that is a different discussion). But I do not like to limit myself to VHF/UHF.

My wife, on the other hand, does not think my “go bag” should take up a significant portion of our suitcase when we travel. I did build a slimmed-down go kit with my Yaesu 891, but that was still north of 12 pounds (vetoed by Wife). Then, I made a go kit with my Yaesu 818, but that was still near the 10-pound zone (again, vetoed). I needed a slimmer package.

I turned to the likes of the QCX mini or other CW-only radios. The problem is that I still am far from proficient with my code, so relying only on CW was a bit more frustrating than I wanted it to be. The (tr)USDx, an open-source radio about the size of two stacked decks of cards, interested me in both price point and functionality. It has SSB, CW, and digital capabilities….on five different bands! Once it was in my hands, I had to build a kit around this new radio!

I want to keep my radio protected, so I started with a small dry box. On the inside, I printed a ‘redneck laminated’ (see also: packing taped) a quick setup guide for using the radio on digital modes if I ever have an in-field case of “the dumb.”

The radio is powered by a small RC battery. I chose this for size, weight, and availability (had it lying around from another project). When fully charged, it reads 12.6 volts. I added powerpole connectors to it because who does love powerpoles (be careful not to short the battery when adding power poles)? I have a small power adapter that goes from powerpoles to the 1.3mm connector so I can use my bench supply or other power sources without making another cable.

I have two antennas that I use (a K6ARK end fed and a QRP Guys No-Tune end fed with 26 gauge wire for 20m). But I like the QRP Guys one because I mostly do 20m and I think it was slightly lighter than the K6ARK antenna (don’t quote me on that though, I loaned the K6ARK one out and have not gotten it back). Plus, not having a tuner lightens my load as well!

Deployed for digital modes.

I have a retired smartphone in my kit that I use for some logging and some other ham-related apps, but mostly for FT8 using the FT8CN app. I also have WoAD on there and soon I hope I can get WinLink functionality with a small TNC as per this video by OH8STN. HF WinLink would be a good benefit with a lighter load than packing in a laptop or Raspberry Pi.

The kit weighs in at 2 pounds 6 ounces (just over a kilogram). This could be stripped down if I only did an SSB, Digital, or, gasp, a CW activation. But as it stands, the small form factor and low weight make the wife happy!

73,
Jim
KI7URL

Equipment:

Accessories, Field Reports, Hacks and Hints, Morse Code, News, Portable, POTA, QRP, Videos

Field Report: Testing the bhi Dual In-Line with the (tr)uSDX, making a big blunder, and P2P with Teri!

10 Comments

On March 30, 2022, I took my factory-assembled (tr)uSDX transceiver on a POTA activation at South Mountains State Park.

It was a “test flight” of sorts since I’d only had the (tr)uSDX for a few days and had not taken it to the field.

I wrote up an assessment from that initial POTA activation mainly to give other potential (tr)uSDX owners an idea of how well one of these super-affordable radios might perform.

Difficult to critique

It’s difficult to critique a 5 band HF radio that you can purchase as a kit for less than $100 and fully-assembled and tested for less than $150…shipped!

On the one hand, I think it’s one of the most amazing portable HF radio innovations of the past decade. It simply blows my mind that the developers (DL2MAN and PE1NNZ) could make this modest radio hardware do so very much. It’s truly a triumph of engineering and a fun little radio.

On the other hand, this isn’t a high-end radio, so we can’t expect performance like we’d see in an Elecraft, Icom, or Yaesu field radio, for example. I never expected this, in fact, but was very curious if the performance would be “good enough” for POTA or SOTA.  So many had asked me about buying a (tr)uSDX as their dedicated POTA radio.

I found using the (tr)uSDX for POTA was actually quite fun, and I certainly achieved my goal of activating a POTA park with it.

So yes, it’s good enough!

That said, I haven’t reached for the (tr)uSDX to do POTA or SOTA since last March because I prefer the performance characteristics of my other radios.

My biggest complaint, frankly, is that the audio fidelity is pretty poor. The noise floor of the (tr)uSDX is higher than most HF radios and audio amplification is very basic. I notice a lot of electronic noises (pulsing, etc.) in my unit. I find it a bit fatiguing to listen to for long sessions with my headphones. The internal speaker isn’t really a viable speaker for doing an activation–it’s more akin to an emergency speaker, if anything.

When plugged into an external amplified speaker, the audio is much improved. The pops and internal noises are still there, but it has better overall fidelity and the volume can be raised enough to hear weak signals (this can’t be easily done via the internal speaker).

It struck me that a DSP device might clean up the (tr)uSDX’s audio and noise floor a bit.

Enter the bhi Dual In-Line DSP filter

Sometime during the beginning of the pandemic, I reached out to bhi Noise Cancelling Products and asked if I could test one of their DSP units as a loaner. I’ve always felt that bhi manufactured the best DSP products in the amateur radio market.

At the time, I wanted one of my friends and contributors on the SWLing Post blog to test the bhi unit and see if it might help out a QRM situation that popped up at his QTH. I thought it would make for a great evaluation since I have little to no QRM at my home.

Graham, at bhi, kindly sent me a unit–the Dual In-Line Noise Eliminating Module–and as I prepared to forward it to my friend, his noise was no longer an issue. I can’t remember the details now, but there was no need to send it to him.

I notified Graham that I would like to test it myself, but that my plate was so full it would take time. What ended up happening, though, was I completely forgot about it due to a busy family life at the time.

I re-discovered the unit this year and spoke (apologized) to Graham at the 2023 Hamvention. Of course, he had no issue at all and was very forgiving. He’s a great fellow.

I thought pairing this bhi DSP unit to the (tr)uSDX would be a great way to, perhaps, cut down on the listening fatigue.

Fort Dobbs State Historic Site (K-6839)

On Wednesday, July 5, 2023, I had an opportunity to test the (tr)uSDX/bhi pairing at Fort Dobbs State Park. Continue reading Field Report: Testing the bhi Dual In-Line with the (tr)uSDX, making a big blunder, and P2P with Teri! →

News, QRP, QRP Radios, Reviews

What are my favorite QRP field radios in terms of audio quality–?

38 Comments

Many thanks to QRPer.com reader, Charles, who recently sent me the following question:

Thomas, I’ve watched a number of your videos and read your activation reports. I’m studying for both my Technician and General class license right now and hope to pass both in one session later this month. I’m also learning CW.

I consider myself an audiophile and appreciate good audio fidelity. I know that amateur radio modes are narrow and by their very nature have less audio fidelity than commercial broadcast modes. 

I’ve already obtained a Kenwood TS-590G for the shack. It was practically given to me by a friend. I’m very pleased with its audio fidelity especially when I connect it to an external speaker.

Next year, I plan to buy a dedicated QRP field radio. Out of the radios you’ve owned, what are your favorites in terms of audio fidelity. Also, what are your least favorites?

Thank you.

What a great question, Charles!

Being an audiophile, I’m sure you understand that this is a very subjective area: one person’s idea of good audio might not match that of someone else’s.

I can only speak to how I evaluate a transceiver’s audio.

What makes for good audio?

A lot goes into what I would call “good audio” in an amateur radio transceiver.

To me, “good audio” means the radio

  • produces clear accurate sound,
  • has stable AGC (Auto Gain Control),
  • has audio properties that benefit amateur radio modes like CW and SSB,
  • has enough audio amplification to be heard in noisy field conditions,
  • and has little to no internally-generated noises leaking into the audio amplification chain. (In other words, a low noise floor.)

In contrast, radios with poor audio

  • sound noisy/harsh,
  • have a high noise floor or produce audio hash making it difficult to hear weak signals,
  • have speakers that become distorted at higher volume levels,
  • have poor AGC characteristics which lead to pumping,
  • and are simply fatiguing to listen to during extended on-air sessions (like long activations or contests).

I would add that a good receiver front end is an important part of audio because it keeps imaging and overloading at bay, thus producing a less cluttered and noisy audio experience.

My field audio favorites

I’ll keep this discussion limited to QRP field portable radios. There are numerous 100 watt desktop radios with excellent audio because those models aren’t trying to limit their current consumption like field radios typically do. They can use more amperage to benefit audio amplification and push a much larger speaker.

In addition, I’ll limit the scope to field radios with built-in speakers. There are some great CW-only radios out there that lack an internal speaker but have great audio (thinking of the Penntek TR-35 and the Elecraft KX1, for example); choice of earphones or headphones can have a dramatic effect on audio. That’s a different discussion altogether!

Best audio: My top three picks

The following are three of my favorite portable field radios in terms of audio quality. I limited myself to three simply because all of the radios I use regularly in the field have what I would consider good and acceptable audio.

The following are simply stand-outs, in my opinion:

Continue reading What are my favorite QRP field radios in terms of audio quality–? →