Tag Archives: Icom

Dan’s homebrew Icom IC-705 protective case

Many thanks to Dan (KQ8Q) who writes:

Hi Tom,

I saw your recent video post of an activation using the IC-705 and I thought you might appreciate one of my recent related projects. Earlier this year I purchased an Icom IC-705 and because I planned to carry it backpacking for Parks and Summits on the Air, I knew I needed some type of physical protection for it since it would be knocked around a bit on rocks and rough surfaces and during transport. The only cases I could find did not fit my vision; they were either too expensive or too flimsy. So I decided to fabricate my own.

I purchased a 9″ x 18″ sheet of 1/8”, 5052 aluminum. I bent it (with LOTS of effort) in two places which created a “U” channel. The lengths were 4.5″ x 3.5″ x 4.5″. I then cut off the excess and used it to make the side pieces. I then did some research on aluminum brazing which led me to purchase some “AlumiWeld Rods” from Harbor Freight and a canister of MAP gas. I then cut the pieces for the front and sides and brazed them in. You may notice the amateur looking joints on the sides of the armor.

I also wanted to have a mic and key port on the front of the enclosure so as not to be continuously connecting and disconnecting those items directly from the radio and for convenience.

The entire assembly was planned to fit perfectly in the plastic orange ammo box also shown. It is made by a company called Sheffield which is in the U.S.

The radio mounts in the armor via the AMPS pattern screw holes on the bottom. I believe they are 4mm screws… not supplied by Icom. The radio is also electrically connected to the armor via the four screws as well as the shields of the mic and keyer ports.

I recently added the vent holes on the top panel for a less than obvious reason. Although they do serve a dual purpose, my primary reason for adding them was to avoid blocking its GPS reception, but factors of cooling and weight reduction do apply.

73 de Dan (KQ8Q)

This is an absolutely brilliant project, Dan, and to my eye, there’s nothing amateur about it. The coating looks fantastic and I like all of the effort you put into stand-off space to protect the rig and connections. Mounted in that orange box, I think you’ve got an all-weather solution. 

Thank you for sharing this project, Dan!

Upgrading the ICOM IC-705 with BHI’s Amazing Noise Reduction Module

IC-705 switch/LED control for the BHI NEDSP1901-KBD module
An easily accessible, multi-function button on the IC-705’s “back rim” gives a great improvement over the stock noise reduction. (ICOM, with all your resources, why can’t you design a DSP NR circuit that works as well as BHI’s? )

I admit it! I’m in love with BHI Ltd.’s DSP noise reduction accessories. I’ve owned most of their popular models like the DSP Desktop Speaker, and have installed BHI low-level audio modules in six different receivers and transceivers.

How is it that an audio-based DSP noise reduction accessory can be so effective? Only BHI knows, but they clearly have top-notch algorithms that rival the best of noise reduction circuits in contemporary Yaesu transceivers. (Personal bias alert: I find Yaesu’s approach to noise reduction (“DNR” in Yaesu-speak) to be quite superior to ICOM’s, and this is what got me thinking about improving the transceiver with an internal BHI NEDSP1901-KBD module in the first place.)

The noise reduction feature in the IC-705 and its IC-7300 base station counterpart is merely “OK” in my opinion, but the addition of BHI’s NR makes a significant difference in S/N and intelligibility of signals. It’s simple enough to use an external BHI product and connect it to your rig’s speaker or headphone’s audio path, but it adds wiring and complexity. The ICOM IC-705 modification described in this article is a neat, clean, internal solution needing no external wiring or power supply.

Continue reading Upgrading the ICOM IC-705 with BHI’s Amazing Noise Reduction Module

Joe’s DIY stand for the Icom IC-705

Many thanks to Joe (KD2QBK) who writes:

Hi Thomas:

Like many I’ve taken the plunge on an Icom IC-705. Even though I sold off an old Yaesu 817 to finance part of it, it still cost a very pretty penny and I didn’t want to shell out more for a tilt stand or bail.

Especially at the rather extravagant prices they’re going for now. $30, $40? No thank you. (Really, the radio, at $1300, should have come with one in the box, but why beat that dead horse – it is what it is.)

In any case, I looked around the house for something to DIY one with. I found a couple of metal angle brackets, screws that fit the mounting holes, and some tiny rubber bumpers to shield from nicking up the radio’s plastic case. Voila! Instant tilt stand. See pics:

And just the right angle too. My plan is to plastic-dip the brackets so I can get rid of the bumpers as well as not nick up any softer surface the radio sits on.

IC-705 Bluetooth Question

Meanwhile, a question for you and other owners of this radio.

What’s up with the Bluetooth function? I have three bluetooth speakers and a small audio amp with built in BT, and I can’t get audio to play through them. The unit sees the accessories and connects. But no sound. I’d updated the firmware to 1.24, just in case they might have addressed any issue. Still no joy.

That being said, I can control the radio via BT with android apps, etc, but no audio. A very disappointing development for such an expensive radio.

Oh well. The good with the bad and all that…

Joe Patti (KD2QBK)

Thank you for sharing this, Joe!  That’s a very clever and simple solution for the IC-705 stand. 

As for the Bluetooth functionality, I’ve yet to use it. Hopefully, someone here can chime in and comment with advice!

Comparing the lab599 Discovery TX-500 and the Icom IC-705

By request, I’ve just posted another transceiver comparison video. This time, we take a look at the lab599 Discovery TX-500 and Icom IC-705 to determine which radio might better suit your needs.

As I mention in the video, I see these portable QRP radios as being in two different classes:

  • the TX-500 for operators who want the most rugged, efficient, and weather-resistant general coverage transceiver currently on the market and
  • the IC-705 for operators who want the most feature-packed high-performance portable transceiver on the market

Both radios are excellent options for hams who, like me, prefer playing radio outdoors.

Video

Click here to watch on YouTube.

What did I miss?

As I mentioned in the video, I knew I’d forget some important points while making the live recording. Here are some extra notes I wish I would have included:

SSB operation: Both radios have excellent features for the SSB operator including EQ settings for both transmit and receive which is a major plus for a QRP radio. I wouldn’t make a purchase decision based on SSB operation–both are excellent.

CW operation: CW operators will be pleased with both rigs. It’s important to note, though, that the TX-500 doesn’t have full break-in QSK like the IC-705. The TX-500 has at minimum a 100ms recovery time after keying a character. That’s a quick recovery, but not fast enough so that an operator can hear between characters formed; especially at high speeds. The IC-705 has full break-in QSK and it sounds great. Note that both the TX-500 and IC-705 use relays, not pin diode switching, so you can hear relays clicking inside the radio, but both are pretty quiet.

Protecting the IC-705: There are a number of IC-705 3rd party cages appearing on the market. These can be used to help protect the IC-705 in the field. Numerous readers and YouTube channel viewers have recommended the IC-705 Carry Cage by Peovi. From what I’ve seen, it looks to be the best of the bunch, but it doesn’t do a lot to protect the lower back portion of the radio–the part of the chassis that meets a surface. I feel like it’s not quite what I’d want, thus hard to justify $135 for it. Other aluminum and 3D printed cages seem to add too much bulk to the radio or obstruct some of the most common connection points on the sides (antenna, key, ATU control cable, speaker/mic, etc.).

TX-500 connectors and cables: The TX-500 uses GX12 mm connectors that are widely used in aviation, commercial and military applications. They’re easy to find online, but the price per each with shipping is typically around $7.00-8.00 US.  You get a better deal if you buy in bulk, but often bulk packages of 5 or more are of the same pin count/configuration. W2ENY has posted a number of accessory cables, spare connectors and even a military-style handset on his eBay store and website. The Icom IC-705 uses more standard 1/8″ and smaller two and three conductor plugs.

Receiver Performance: Based on Rob Sherwood’s receiver test data table, the IC-705 has a performance edge over the TX-500.  In the field, this difference is not noticeable. Indeed, both radios have very respectable numbers. If I had to choose one radio over the other if operating in a CW contest, for example, I’d give slight preference to the IC-705. I’ve used the TX-500 during a CW contest before, however, and found it did a brilliant job blocking tightly-spaced signals–click here to watch the short video.

Warranties: Both the Icom IC-705 and TX-500 come with a one year factory warranty. Click here for lab599 warranty service contacts and centers. Click here for Icom.

Feel free to comment if you have other specific points I might have forgotten.

Resources and links

Icom IC-705:

lab599 Discovery TX-500:

Feel free to comment and please let me know if there are other transceiver comparisons you’d like to see!

Which should you buy? The Icom IC-705 or the Elecraft KX2?

Without a doubt, the most popular type of question I receive from readers here on QPRer.com and over at the SWLing Post has to do with making equipment purchase decisions.

In the past two months, I’ve had numerous questions from QRPer readers asking my opinion about choosing between the new Icom IC-705, or the Elecraft KX2. In fact, as I started putting this post together this morning, I received yet another email from a reader asking my opinion about these two iconic QRP transceivers!

I love both of these radios for different reasons, so the answer is not an easy one.

Let’s discuss this in some detail…

I decided to make a video talking about the pros and cons of each transceiver and note the reasons why one might pick one over the other. My hope is that this will help inform a purchase decision:

Click here to view on YouTube.

Do you own both of these radios? Or did you recently decide to purchase one instead of the other? Please comment with your thoughts and opinions!

Activating the New River State Park with the Icom IC-705 and EFT-MTR end-fed antenna

On Monday, March 22, 2021, I performed three QRP field activations in one day. I started off the day with a visit to Three Top Mountain Game Land, and then headed to Mount Jefferson State Natural Area for a POTA and SOTA activation before heading to my final destination: New River State Park.

I had never visited the New River State Park before but I knew since it was an NC State Park, it would be a beautiful site…and it certainly was.

It being a mid afternoon on a Monday in mid-March, I had the entire park to myself.  Well…at least I had the entire park from my access point (this particular park has a number of entry points).

Sadly, I didn’t have a lot of time to explore the park nor any of its trails, because I was on a fairly tight schedule.

New River State Park (K-2748)

I decided to deploy my EFT-MTR 40/30/20 end fed antenna and pair it with the Icom IC-705. Since New River had a spacious picnic area with numerous tall trees, setup really couldn’t have been easier.

Gear:

In the video below, I actually demo how I used my arborist throw line to deploy the EFT-MTR antenna.

On The Air

While the weather and the POTA site were ideal, propagation was not.  I knew that going into the site and that’s exactly why I deployed a near resonant wire antenna instead of a vertical.  I say “near-resonant” but the EFT-MTR is actually a resonant antenna on 40, 30 and 20 meters–I repaired mine recently, however, and it affected the resonance. I need to take an antenna analyzer to it and sort that out. In the meantime, though, I simply used the mAT-705 Plus ATU to take the edge off of the SWR.

I ended up only using the 40 meter band to make my 11 contacts in the span of about 33 minutes. Considering the propagation and the fact it was a Monday mid-afternoon, I was pleased with the results.

If I had the time, I would have moved up to the 30 and 20 meter bands, but again, I had a schedule to maintain so I went QRT after working my buddy K8RAT.

Video

Here’s a real-time, real-life video of the entire activation:

I’m definitely coming back to the New River State Park later this year. In fact, I think this would be an ideal spot for a family canoeing and camping trip.

As I’ve said so many times before, this is what I love about POTA and WWFF: they provide an excuse to check out public lands that wouldn’t normally be on my radar.  New River is a perfect example since it’s a little too far from the QTH to be a day trip, yet a little too local to be a destination we’d typically plan in our cross-country travels.

Thank you for reading this report.

73,

Thomas (K4SWL)


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Icom IC-705 Firmware Update (Version 1.24)

Many thanks to Markku (VA3MK) who writes:

New Icom IC-705 firmware has been posted for version 1.24.

IC-705 | Firmware / Software | Support | Icom Inc. (icomjapan.com)

Changes from Version 1.20

– Improved the Scope function of the RS-BA1.
– Supports a 64-digit hexadecimal format WPA/WPA2 Password.

Thank you for the tip, Markku!

My review of the Icom IC-705 QRP transceiver

I recently published my full review of the Icom IC-705 over at the SWLing Post. If you’ve been following QRPer for long, you’ve likely seen this little radio in action.

If you’d like to read the full review, which was originally posted in the February 2021 issue of The Spectrum Monitor magazine, click on this link to visit the SWLing Post.

POTA Field Report: Pairing the Icom IC-705 with the CHA MPAS Lite at Tuttle

Last week, we had a glorious break in the weather–it felt almost spring-like.

On my way back home after visiting my parents, I decided I would take in a quick afternoon hike. I originally planned to go to one of my favorite county parks, but I also had a hankering to get on the air and that park wasn’t a part of the POTA network.

Tuttle Educational State Forest (K-4861)

I decided to stop by Tuttle Educational State Forest (K-4861) instead and make February 19, 2021 not only a hiking day, but a Parks On The Air day. Tuttle sports both excellent sites for POTA and a nice little trail system.

Gear:

I decided to play radio first then go on a hike, so I pulled out an antenna that I thought would give me quick deployment and pack-up: the CHA MPAS Lite.

I also remembered that a reader recently asked if I would include the deployment of the CHA MPAS Lite in one of my real-time, real-life activation videos. So I did just that!

Deployment was quick and the mAT-705 Plus ATU did a fine job finding matches on the CHA MPAS Lite.

I started calling CQ on 40 meters and worked quite a few stations in short order. When the first batch of eight chasers was worked, I moved up to the 20 meter band and started calling CQ. My hope was that I could work at least a couple of stations on 20 meters then pack up and go for a hike.

I started calling CQ on 20 meters and was quickly rewarded six additional contacts.

Without a doubt–if this wasn’t completely obvious in my video–the highlight was working my friend John Harper (AE5X) in Texas. I’ve known John for years now and have followed his excellent blog but we’ve never managed to catch each other on the air!

Turns out, John was using his recently unboxed Icom IC-705 as well. Click here to check out his post which includes a mention of this very activation. In addition, check out his thoughts after taking the IC-705 (all amped-up with the KPA-500) on the ARRL CW contest that weekend.

Another highlight was logging CU3BL in the Azores again. To me, it’s still mind blowing that 5 watts can reach out that far.  Here’s a QSOmap of the activation (click to enlarge):

In total, I logged 14 stations with 5 watts and a vertical in very short order, leaving me a full hour of hiking time! Mission accomplished!

Video

Here’s a real-time, real-life video of the entire activation:

The hike afterwards was just what the doctor ordered, too. I’ve mentioned before that my ankle has been healing nicely after twisting it badly in December. This hike was an easy one and gave me a chance to properly test my ankle before the (epic-to-me) SOTA activation I planned with my daughter, K4TLI the following week. (More on that in a future post!)

Here are a few photos from the Tuttle hike:

If you ever find yourself at Tuttle Educational State Forest doing a POTA activation, make time to take in a hike as well. It’s a gentle hike and even the long loop can be completed within an hour at a very leisurely pace.

Thanks for reading this field report and please comment with your experiences on the air and in the great outdoors!

Poor propagation but impressive QRP DX with the CHA MPAS 2.0 vertical antenna

One of the funny things about doing field activations is you never know what to expect when you arrive on site, setup, and hop on the air. It’s part of the fun, really. There are certain things you can control, and then there’s propagation.

On Sunday, February 14, 2021 (yes, Valentine’s Day), we had a modest break in the weather and my wife and daughters encouraged me to hit the field to do a quick activation before an afternoon movie marathon. Sunday was the first day I had seen the sun at our house since the previous Wednesday when the cloud ceiling descended to the altitude of our house (3,300′ ASL) and stayed there. It also wasn’t raining incessantly on Sunday, which was a welcome change.

I checked with my go-to propagation friend Mike (K8RAT) before heading out the door and he informed me that things were dismal. I wasn’t surprised: earlier that morning I worked a couple CW stations calling CQ POTA on 40 meters who had very few takers.

Still…I wasn’t going to let propagation stop me.

“Damn the torpedoes, full steam ahead.”

I chose the Zebulon B. Vance Birthplace (K-6856) as my POTA site because it’s the closest park to me that has a covered shelter. I fully expected rain to move in within an hour and really didn’t want that to cut my radio play short.

Once I arrived on site, I decided to deploy my  Chameleon MPAS 2.0 vertical antenna. Why would I use a multi-band vertical instead of a more efficient wire antenna on a day with dodgy prop?

Aren’t you a handsome antenna!

For one thing, I had a limited amount of time and the MPAS 2.0 can be deployed and packed up within a few minutes. Also, I could position the MPAS 2.0 close to the shelter so if heavy rain moved in, I could even keep the base of the antenna protected and pack it up under cover. That and I really didn’t want to fiddle with a wire antenna in the rain if I didn’t have to.

Gear:

On The Air

In short: I only made 12 contacts during this brief activation.

But what I lacked in quantity, I made up for in quality!

Let’s skip straight to the QSOmap of the activation. Keep in mind these are contacts made with a vertical antenna and only 5 watts of power (green poly lines are CW, red is SSB):

Click to enlarge.

Days like Sunday we can’t expect large pileups with five watts, but we can expect normal–albeit brief–openings that allow for some serious low-power DX.

My five watts and a vertical caught Raffaelle’s (IK4IDF) attention in Italy. Sure…he has good ears with a nine element HF Yagi, but I worked him with 5 watts over a distance of 7653 km / 4755.36 mi.

951 miles per watt? Yes, please! I’ll take that!

Parks On The Air isn’t really about working DX, but it’s so much fun when it does happen.

Video

I made a video of the full activation which includes setting up the Chameleon CHA MPAS 2.0. As I mention each time, this is a real-time, real-life video so keep expectations low. 🙂 It includes a number of mistakes on my part.

Click here to view on YouTube.

I’m hoping this odd pattern of bad weather will break soon. I shouldn’t complain: I feel pretty fortunate that we haven’t gotten hit hard with some of the heavy winter conditions affecting much of North America right now.

As soon as it dries up a bit, I’m ready to hike to a local summit for a little SOTA (Summits On The Air) fun! I can’t wait…