All posts by Matt W6CSN

Field Reports, Guest Posts, Morse Code, POTA, QRP

Offline QRP Activation

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When you have activated the same park nearly 160 times, it starts to get a bit routine. Certainly, any day that you’re alive and able to participate in ham radio is a day to be thankful for, but I have to admit that lately I’ve gotten rather bored with activating from the Presidio of San Francisco US-7889.

the Golden Gate Bridge in a clear morning.
Not a bad view from the activation location.

What could I do to spice things up a little bit? Recently, the W6CSN shack welcomed a new member into the QRP radio lineup, the venerable Heathkit HW-8. This got me to thinking about the days when the HW-8 was new, QRP was a niche part of the hobby, and the Internet was something that connected mainframes at universities.

Heathkit HW-8 Front Panel

That’s an idea! Try to activate a park for POTA without using the internet tools on which we’ve come to rely. The rules are: no self spotting on the POTA website and no looking at the POTA spots page to find stations to hunt. If you want to hunt, you’re going to have tune around and listen for stations calling CQ.

close up photo of antenna mounted to a steel post
The stainless steel vertical mounts to a fence post which provides a good counterpoise.

The HW-8 would not debut on this activation as it’s waiting on a power cord and we haven’t really gotten to know each other yet. Instead, the trusty KH1 would be the radio choice today, coupled to a quarter wave vertical on 20 meters and sending via the Bencher BY-1.

KH1 transceiver and Bencher paddles on a park bench
It is only fitting to use the BY-1 on a park bench.

I set up camp on 14.059 MHz and began calling CQ POTA with no prescheduled activation, no spot on pota.app, not even looking at my phone to see what the propagation numbers were saying. In fact, I only used my phone as a camera to take pictures for this field report.

Within a few minutes I got my first call, from Ken VE7HI. The next 40 minutes were spent calling CQ and hunting other stations until I had six contacts in the log. Then came the long, desolate hour of calling with no responses and being unable to break through any of the “pileups” around other activators. The drought ended with a P2P with NR1D/0 at Barr Lake State Park in Colorado and 15 minutes later the activation was complete with K6BBQ coming through for QSO number 11.

map showing location of contacted stations
Map of “offline” POTA activation QSOs.

While the internet certainly makes it so much easier, this activation proves that the QRPer can be successful in POTA with just a 5 watt radio and a half decent antenna. If you are looking to spice up your POTA routine, why not give an “offline” activation a try?

72 de W6CSN

Guest Posts, New Products, News

New Mountain Topper MTR-3B Details

21 Comments

by Matt (W6CSN)

The Mountaintopper MTR-3B is a popular QRP portable HF transceiver that has a bit of “cult-ish” mystique about it. The radio seems to hit the sweet spot of size, weight, performance and capability desired by so many portable operators.

While I have operated the MTR-4B, and quite like it, I have yet to get my hands on the much vaunted 3B. Hopefully that’s about to change as LNR Precision has released details and pricing for the next iteration of this legendary radio.

LNR website showing the new MTR-3B “Curahee”

You can check the specs for yourself on the LNR Precision web site. What piques my interest is that the band plan adds 15 meters at the expense of 30 meter coverage and the integrated touch keyer eliminates the need to pack a set of paddles.

Things that I am wondering out loud:

  • Does plugging in paddles disable the touch sensors?
  • Can the frequency display be configured to show MHz?
  • What is the receive current draw?
  • How many “R”s in “Curahee”?

Perhaps the announced pre-release of the user manual will answer these questions.

What do you all think of what we’ve seen of this new Mountaintopper so far?

72 de W6CSN

Guest Posts, Morse Code, POTA, QRP, Travel

Western States POTA Roadtrip Summary

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Introduction

by Matt (W6CSN)

In early August, my family and I had occasion to take a road trip totaling nearly 2800 miles (4500 km) across six different U.S. states.

The title of this posting might lead you to think that this trip was dedicated to doing Parks On The Air activations, but that was not the case. Instead, we were in the process of delivering a kid to their next adventure in higher education.

Since I have already gone into some detail of these POTA activations on my blog at w6csn.blog, this post will be just a summary of the amateur radio aspects of the trip, plus some of the pictures taken along the way.

Spring water flows from a cave in Logan Canyon.

There was limited space in the tightly packed car and some tough decisions had to be made about what radio equipment to bring. I settled on the Elecraft KH1, the most compact HF CW station you can carry. I also brought the Yaesu FT-818 and microphone. The all-band, all-mode capability of the ‘818 gives me some peace of mind when traveling through dark territory. Of course, I also carried a Garmin InReach on my radio bag.

Park POTA reference State QSO count
Bud Phelps WMA US-11044 Utah 10
Pioneer Historic Byway US-10420 Idaho 12
Lory State Park US-1228 Colorado 12
Wyoming Territorial Prison US-6122 Wyoming 11
Great Salt Lake SP US-3075 Utah 10
Rye Patch SRA US-4444 Nevada 10
All activations combined on a single map, with apologies to my Alaskan friends..

Operating Notes

The first POTA activation happened at Bud Phelps WMA in the Cache Valley near Logan, Utah. Surrounded by farm fields and livestock, the FT-818 and MFJ-1979 telescoping whip brought in 10 QSOs for a complete activation.

The FT-818 is truly a “field” radio.

Later the same day we detoured up into Idaho to bag Pioneer Historic National Scenic Byway. With an afternoon temperature of 95°F, I was happy that the KH1 and Gabil GRA-7350T antenna got the job done in short order.

Remembering the victims of the massacre.

On the way over the mountains from Utah to Wyoming we stopped briefly to stretch our legs at the Bear Lake Overlook. I thought this would be a perfect place to whip out the KH1 with built-in whip and see if I could make a contact or two as a hunter. Alas, the bands were truly “dead” and I could not hear any signals, let alone make contact in the short time spent at this rest area.

No QSOs but the KH1 is looking great at Bear Lake Overlook.

Several days later, we dodged thunderstorms to sneak in an activation at Colorado’s Lory State Park. Again, the KH1 and 7350T paired up for a quick 12 QSOs before threatening weather called an end to the operation.

Mountain thunderstorms kept us on our toes.

Now on the return leg of our journey, we stopped in Laramie, Wyoming for fuel, some snacks, and to activate Wyoming Territorial Prison State Historic Site. This time the 7350T antenna perched atop the Gabil GRA-GNT Tiny Tripod with ground spike, a compromise for sure, but it works well enough for POTA.

Territorial prison restored and welcoming guests.

Back in Utah, a POTA of opportunity presented itself with a brief visit to Great Salt Lake State Park. With no place to setup a more extensive antenna system, I deployed the Tufteln right-angle adapter to use the KH1 on a picnic table with the 4 foot whip. This setup certainly attracts some curious looks from passersby.

The red Tufteln adapter is certainly eye catching.

Later, at home, I realized that when we had stopped to marvel at the Bonneville Salt Flats that there was a “2-fer” right under my nose. The salt flats themselves are private property, but the adjacent rest area counts for the California National Historic Trail and the Pony Express National Historic Trail.

The Bonneville Salt Flats are a must see.

The final POTA activation of trip came at Rye Patch State Recreation Area, about a half hour west of Winnemucca, Nevada on Interstate 80. Here it was time to use the FT-818 once again to try to get the activation done in the morning before the desert heat really got cooking. After an hour on the air, 10 QSOs were in the log and we were once again on the road for our final day of driving on this tour of The West.

The high desert is uniquely beautiful.

Equipment Used

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Donner Summit in California

72 and POTA ON!

de W6CSN

Field Reports, Guest Posts, Morse Code, Portable, POTA, QRP, Travel

UK POTA Rain and Shine

6 Comments

by Matt (W6CSN)

Bletchley Park

Most readers of this blog are probably familiar with Bletchley Park and the significance of this place in breaking the codes used by the axis military forces during the second world war.

The electromechanical systems developed and used here to aid the codebreakers in their daily work led directly to the electronic digital computers of the mid-twentieth century, and then to the modern world as we know it.

After boarding the London Northwestern Railway at Euston station, the hour long train journey took us from central London, through the suburbs, then the pastoral English countryside to the station at Bletchley, just south of Milton Keynes.

Bletchley Park is a five minute walk from the train station at Bletchley, the town of the same name. In keeping with the formerly clandestine nature of the work at Bletchley Park, there are no loud signs to welcome you, just the Union Jack flying over the nondescript visitor center in Block C.

Exiting the visitor center, any ham will quickly spot the three-element SteppIR Yagi perched atop a roof-mounted tower. Also from the tower, a folded dipole extends over the the Block B building which houses the Alan Turing museum exhibits. The other end of this antenna farm is plugged into GB3RS, the amateur radio station for the National Radio Centre of the RSGB.

The friendly and helpful staff of amateurs at the NRC played a crucial role in my hoped-for plan of activating Bletchley Park for Parks On The Air.

Surprisingly, the POTA page for GB-0507 showed only a handful of activations of this iconic location. Seeing as this is a heritage site, I sent an email to the NRC about week before my visit asking for advice on how to be a welcome guest POTA operator.

Note, the NRC is colocated on the grounds of the museum but they are not a part of Bletchley Park. The NRC is a separate organization.

Martyn G0GMB, the Director of the NRC, kindly responded to my enquiry and informed me that individual amateur radio activity is not generally permitted on the grounds of Bletchley Park due to the number of visitors they receive and concerns about RF safety. This could explain the low number of activations.

The sharp eyed will spot the GB3RS beam across the pond.

Martyn suggested I could set up in the overflow car park few minutes walk down the road from the visitor center. While not on the grounds of Bletchley Park proper, the parking lot operation would still be in the spirit of POTA and would reasonably count as a valid activation location.

When I arrived at Bletchley Park on Friday afternoon, I was met by Mervyn G4KLE who was expecting me thanks to a note left by OM G0GMB. Mervyn asked where all my equipment was and I motioned to the pack on my back.

Because my radio and antenna was a low impact, minimal footprint QRP setup, I was told that I could make use of the picnic table just out the side door of the GB3RS shack, with my antenna setup just beside it. This dead-end spot was not on any of the paths frequented by park visitors and my antenna would not be easily visible.

The antenna is low profile

This was a much better arrangement than trying to activate from a car park without a car! I quickly deployed a GRA-GNT micro tripod with center spike pushed easily into the soft ground. The GRA-7350T loaded vertical and a set of short radials provided an SWR of 1.05 to 1.

I chose the QMX as a travel radio while in Britain because with it, the overall kit is very lightweight and compact. With the exception of the tripod the whole kit fits in my carry-on. The GRA-GNT antenna mounting kit has to fly in checked baggage due to several aggressive looking spikes that would certainly be flagged by airport security. Continue reading UK POTA Rain and Shine →

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

The Adventure You Get

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Many thanks to Matt (W6CSN) who shares the following post from his blog at W6CSN.blog:

The Adventure you get is not always the adventure you expect. Recently I’ve been plotting a unique activation of the De Anza National Historic Trail, but that particular POTA activation is going to need a good antenna and just as importantly, time.

This day afforded a few hours in the morning for outdoor radio but not enough to retrace the steps of the De Anza expedition. Instead, I headed down to the San Francisco Bay side for a quick outdoor amateur radio session.

Marina entrance light from years gone by

Since it was was a Saturday, my usual spot at Presidio East Beach was heavily impacted by weekend recreation enthusiasts, so I continued for a quarter mile to the practically empty parking lot east of the St. Francis Yacht Club.

Small dry beach on the marina side of the jetty

Thence on foot past the old stone light tower and the clubhouse of the Golden Gate Yacht Club, you find yourself of the path to the end of the breakwater where a unique art installation sits.

Alcatraz Island at anchor off the point

The Wave Organ is a curious sculpture that uses tubes and cavities between old cemetery stones to channel and amplify the watery sounds of waves as the tides move in and out of the Bay.

Surrounded by saltwater at the end of this jetty, which by my reckoning is within the boundary of the Golden Gate National Recreation Area (US-0647), this location was perfect for the “no impact” operation afforded by the Elecraft KH1.

This granite wall served as the operating bench

My plan was to see if I could complete an activation of making 10 contacts entirely by hunting other POTA activators, perfectly reasonable given it was a weekend with no geomagnetic storms to disrupt radio propagation.

An entire station in the palm of your hand

What I did not count on was that it was a contest weekend with both 20 and 15 meters wall-to-wall with rapid fire contesters. As a QRP station, finding the POTA needles in that haystack was going to be tough.

The wave organ is a naturally contemplative environment

I retreated to 17 meters which should offer good daytime propagation and no contesters. There on 18 MHz, I was was able to collect five park-to-park contacts in a span of 23 minutes.

At that point I’d exhausted all of the 17m active CW stations on the POTA spots page and didn’t really have time to wait for more to show up. Therefore the “all hunting” activation strategy was abandoned and I commenced calling “CQ POTA.”

A fresh charge delivers nearly 6 watts into a matched antenna on 17m

The activation was “validated” with a call from Dave, AA7EE as the 10th QSO and then completed with one more park hunted, K9DXA in US-1001. Most of the contacts were with stations east of the Rockies.

http://tools.adventureradio.de/analyzer/

One thing I learned from earlier outings with the KH1 was to not cut the log sheets too small, as might be suggested by the lines printed on the page. Without enough paper under the top and bottom tabs of the logging tray the sheets can easily be caught and snatched away by the wind.

Leave enough margin on the logging sheets and they are easily secured in the tray, even in the face of brisk Bay breezes.

Looking across the marina entrance toward Fort Mason

The “hunting only” activation plan didn’t quite work out but it was a great time out playing radio at scenic spot in San Francisco Bay.

Sailing season is well underway on SF Bay

While I didn’t expect to activate from the wave organ today, it turned out to be a fun adventure and an excellent spot from which to get on the air with the KH1.

73 de W6CSN

Field Reports, News, Portable, POTA, QRP

Change Is Good

7 Comments

by Matt (W6CSN)

Recently, OM Witherspoon (K4SWL) wrote a blog here and shared a POTA activation video in which he described the benefit of changing up your operating location within a large park to keep things fresh or simply to be able to activate within a given schedule.

Activation zone looking over the Pacific

That got me to thinking about my own “home” park, Presidio of San Francisco US-7889, a large park which is also part of an even larger reference, Golden Gate National Recreation Area (GGNRA) US-0647. Recently my XYL, who is very patient, has been subjected to my complaining about being bored by doing the same activation over and over.

Classic vistas from the Presidio of SF

My typical POTA outing is after work, I drive ten minutes down to the East Beach parking area, set up a base-loaded vertical on the roof of my car and plug in the trusty FT-818. Mind you, this is not a bad setup. The location combined with repeatable antenna installation reliably produces contacts and I usually have a complete activation in about 30 minutes.

GRA-7350T antenna deployed

The XYL’s suggestion was, “hey, why not play radio somewhere else?” and K4SWL’s blog and video were an inspiration as well. So I left the FT-818 in the shack, packed up a QMX kit, and headed for the high bluffs in the Presidio that overlook the Pacific Ocean to the west. I setup on an out of the way granite bench that was part of a World War II memorial to servicemen who perished in the coastal waters of the Pacific.

World War Two commemorative wall

My plan was to get on 15 meters in the hope of catching some early JA’s or other Pacific rim DX. The vertical antenna deployed easily and though the location was substantially protected from the strong wind gusts, I did stake the tripod down with a pair of tent pegs.

Tent pegs keep the tripod secure

With an SWR of below 2:1 on 21 MHz I set to calling CQ and posted a spot on pota.app advertising that I was in US-0647 GGNRA, even though I was also still in US-7889. Turns out 15 meters was dead, for me at least. Not a single nibble after 15 minutes of calling.

Good SWR on 15 meters

After a QSY to 20 meters, another half hour brought in only four QSOs! This location and radio combo was certainly a nice break from the usual and even though the QSO pace was glacial, it was quite satisfying and refreshing to do something different.

The QMX station ready for action

Since the clock read just after 00 UTC there was plenty of opportunity to gather the needed contacts for a complete activation. If necessary I could even come out the next day before 23:59 UTC. But since I had no particular time constraint for the evening, I decamped for East Beach where I was pretty sure I could wrap up the activation in short order.

Sunset over SF Bay

Even though I was back at my “usual” spot, starting the activation somewhere else was the change I needed to break the routine. Six more QSOs validated the activation in a matter of minutes. I swear being down close to the waters of San Francisco Bay adds at least 3db to my signal. There is a reason I frequent this particular spot.

Sun going down behind the Golden Gate

I feel fortunate to have so many locations within US-0647 and US-7889 that are quite close to home. I plan to take advantage of this diversity of operating spots, knowing that the “East Beach Amplifier” is always available if my QRP is not cutting it.

72 de W6CSN Matt

P.S. I did, in fact, log this activation as a two’fer.

Articles, Field Reports, Guest Posts, How To, Kits, News, Portable, POTA, QRP, QRP Radios, Reviews

QMX – From Kit to Field!

16 Comments

by Matt (W6CSN)

The Radio

The QMX by QRP Labs is a five band, multi-mode radio introduced by Hans Summers G0UPL at FDIM in 2023. The QMX is the next logical step in the radio development journey at QRP Labs, bringing together the innovative approach to FSK modes like FT8 from the QDX and the CW performance of the QCX series. This is all done in same enclosure as the QCX-Mini which is not much larger than a deck of playing cards.

Size of the QMX compared to standard deck of playing cards.
The QMX is about the size of a deck of cards.

The keen observer will notice that the QMX also sports a built-in microphone which, along with associated circuitry, supports future introduction of voice modes by way of firmware update. Other notable features include SWR metering with protection as well as solid-state “PIN” diode T/R switching, plus the option for “high band” coverage of 20 through 10 meters in addition to the original 80m-20m version.

Most hams have, at one point or other, forgotten to throw the antenna switch, adjust the tuner, or even connect an antenna before transmitting. The SWR meter and protection really sets the QMX apart from earlier QRP Labs radios. There are plenty of sad tales on the QRP-Labs forums from QCX or QDX users that “smoked” the BS170 mosfet finals in a moment of operating into a badly mismatched load. It’s remarkably easy to do, ask me how I know!

The Build

Based on experience with the QCX-Mini and having put together several QDX’s, I admit to being hesitant to starting assembly of this radio. The level of integration in the QMX as a multi-band, multi-mode unit is probably the highest yet to come out of QRP Labs. The components that were merely small in earlier radios are absolutely tiny in the QMX, specifically the LPF toroidal cores. The main board, internal switching power supplies, display, and controls board are all sandwiched together in a tight fit for the custom enclosure.

photo showing a partially completed circuit board
Most of the electronic components installed on the main board.

The build started with a slow and methodical approach of doing a little bit each day and working in the morning when my mind was fresh and there was good light on my workbench, a.k.a. the dining room table.

The first “disaster” happened when performing the factory recommended modification to Revision 2 boards shipped in 2023. The mod calls for a protection diode to be installed across a SMD mosfet. Several leaded 1N4148 diodes were available in my “junque” box so I attempted to carefully fit one of these in the right position on the board. While soldering the diode in place I managed to lift C508, a microscopic .1uF SMD capacitor, clean off the board!

photo of circuit board with modifications
The suggested modification adding a protection diode.

Given the tools at my disposal, there was no way I was going to be able to get that capacitor back into place. Therefore, I grabbed a standard through hole .1uF cap and painstakingly got it connected in the right place, verified by lots of continuity testing.

Once finished with all the electronic components on the main board, I was feeling pretty cocky and also the completion of the project was more clearly in view. The cautious and methodical approach gave way to a faster build pace, which directly lead to the second “disaster.” While installing the headers that connect the main board to the display board, I failed to CAREFULLY READ THE ASSEMBLY MANUAL and soldered the male pin headers where I should have installed the female sockets!

This misstep might have ended the project right then and there if I had not at some point in the last year bought a proper desoldering tool. This is not an expensive automatic vacuum pump powered solder re-work stations, but rather a heating tip and manually actuated solder sucker built into one tool. Twenty-two unsoldered connections later, we were back on track. Continue reading QMX – From Kit to Field! →