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!
What is the #IC705's transmit power?
I recently did a bunch of measurements.
Takeaways:
With the power knob at 0%, output can still be as much as 100 mW.
When using the "max power" setting, actual power delivered is always a little lower.
Output power mildly dependent on which band you transmit.
To achieve 5 W output, I'll set "max power" to 10 W and the percentage to 61%.
More details: https://dj3ei.famsik.de/blog/posts/2025/ic-705_pwr/
🇬🇧 Receiving sstv from Fram2 space mission (EN subtitles) 🇵🇱 Odbiór sstv z misji kosmicznej Fram2
https://video.citizen4.eu/videos/watch/b1c56fa9-32ea-439c-aa9b-ddbdd7242cc9
FRAM2 HAM An amateur radio competition for the Fram2 space mission What is Fram2?The Fram2 mission is set to become the first human space flight in polar orbit – flying over the North and South poles. Named after the famous polar exploration ship Fram, which completed voyages to both the Arctic and Antarctica, we want
ISS 2m/70cm transponder reception test with simple vertical antenna
https://video.citizen4.eu/videos/watch/758e370d-fd7f-4eae-873f-817f3d3614e1
Braved the storm this afternoon to do some 24GHz (12.5mm wavelength) #MicrowaveRadio #AmateurRadio.
One contact made with Pete G1DFL over a 24KM path on #SSB and #DStar. 59+20dB both ways.
#Icom #IC705 IF and #Wavelab based transverter & 1.5w PA into a 30cm Andrew dish.
1.5w x 34.4dBi = 4131w ERP!
DG1JAN 
Gary @N8DMT
Andreas, DJ3EI, he/him
Miłosz SP9UNB
miklo
MrJoshua