QRPing in the backyard in order to test that gears are OK. This time multi-length QRP EFHW with choke and trusty #IC705 on CW

OK just worked #K4NDX in SC from my backyard here in Brittany.
Rig is my trusty #ic705 with 5W.

The antenna is the "rotated delta loop for 10m" that is in Salty Walt's portable antenna sketchbook.

I've used my #IC705 as my main #hamRadio rig for some five years now. Time for a detailed report of my experiences.

Spoiler: Mostly good, but there are a few things I'm missing: USB-C jack, easy CW side tone audio level adjust, 5 GHz WiFi, USB-access to the SD card, open source firmware.

If the "detailed" of "detailed report" does not scare you (as in: fairly long), be welcome to https://dj3ei.famsik.de/blog/posts/2025/ic-705/ .

IC-705

I unwrapped my IC-705, serial number 13001835, on November 21, 2020, so a bit more than five years ago. I’ve been using it as my main rig ever since and mostly like it. Time for a detailed report of

DJ3EI's blog
@jelle I really like my 705, using it is fun on a bun (as the kids don't say). #AmateurRadio #IC705 #Hashtag

My preparations for contact with the International Space Station. Reception is working very well. I can hear Oleg Platonov, a Russian cosmonaut. I still need an antenna for transmitting.

#RS0ISS #ARISS #ISS #ICOM #IC705

Life isn't too short for QRP.

Today I went for 10W WWFF activation which turned into 5W activation as I forgot the battery lead home for my IC-705.

Of course I could have thrown a tantrum but I just laughed and thought "well this is going to be now different" (changes are good for humans)

I snatched over 30 QSOs on only CW with 5W, middle of day of scorching summer.

I would say not bad at all!

QRP is not dead! :D

#qrp #hamradio #amateurradio #wwff #ohff #ic705

Problems using my #IC705 radio together with my computer, the two connected via CAT via USB.

I use the rig's controls to change frequency. Often, frequency sync is lost: Changes of the frequency are apparently no longer communicated to the computer.

I use CAT-controlled Morsecode transmission heavily. That and other commands, including frequency changes from the compuyer, continue to work.

I've seen this problem with different setups, but all using hamlib.

Others seen this also?

#HamRadio

From the picture i've ssen before (and from the Yaesu Manual) the #FTX1F was looking a bit smaler than the #IC705. But it looks like the dimensions in the Yaesu datasheet are without the battery. So basicly both radios are quite equal in size (esp. depth).
Future HF Portable Fun Project (Step 1): Fasten HF antenna base to Rush 24 backpack using Diamond HRKS UHF mount and Comet AD-35M UHF to 3/8-24 adapter. Used 2 thin-ties (0.5 x 8 inches) to attach mount. Still need to route coax and add a detachable dangle counterpoise wire. Planning fixed site setup, 20-6 meters (single band at a time) coverage with CHA SS-17 telescoping whip. Also supports VHF/UHF on-the-go with Diamond NR-770 UHF antenna. Outside setup tests next… #HamRadio #IC705

I recently measured #IC705 transmit power 🧵. But I did not dive into output power's dependency on supply voltage. Jürgen DF3PM kindly made me aware of results by George, M1GEO. George found out that (unsurprisingly), output power drops as supply voltage is decreased from 13 V to 12 V or less.

Interestingly and somewhat surprising, output power is stable as supply voltage is increased to 14, 15, or 16 V, though efficiency drops.
https://www.george-smart.co.uk/2024/07/measuring-the-icom-ic-705-rf-power-vs-dc-input-voltage/

Thanks, Jürgen and George!

Measuring the Icom IC-705 RF Power vs DC Input Voltage | George Smart – M1GEO