Re: [Hamlib-developer] IC7300 output power
Library to control radio transceivers and receivers
Brought to you by:
n0nb
Menu
▾
▴
Re: [Hamlib-developer] IC7300 output power
|
From: Philip R. <gm...@bt...> - 2025-05-30 18:32:01
|
Nate, Can you please ignore the patch. I am seeing a different behaviour now. The way the IC-7300 appears to limit power output on 50 MHz is to cap the drive at 50%. I can set 100% on the drive level setting but this is ignored and the drive level appears to be kept at 50%. Well it actually creeps up to 55% power output at 100% drive, and 50% power out at 50% drive. After Sakari, I also looked at the current consumption. At 100% drive (55% power out) I draw 8A from the PSU with IDD about 7A on the Icom meter. So that indicates about 90W DC to the PA for 50W RF. Until I can get hold of a power meter that handles 70 MHz (mine are either too low or too high a frequency range) I'll not be able to do further work on this. I rushed into this earlier as I could only manage 10 minutes or so to take the measurements. Phil GM3ZZA On 30/05/2025 17:06, gm3zza--- via Hamlib-developer wrote: > Hi Sakari, > > I saw that anomaly after I had sent the e-mail. My default drive is > 50% and I do remember having to change it at one point after switching > from 70 MHz to 28 MHz. I forgot the IC-7300 remembers these by band. I > did read the right result, but mustn't have updated my notes. > > I can't retest it right now. > > 73 Phil. > ------------------------------------------------------------------------ > *From:* Sakari Nylund <sak...@ni...> > *Sent:* 30 May 2025 4:57 PM > *To:* ham...@li... > <ham...@li...> > *Subject:* Re: [Hamlib-developer] IC7300 output power > > That looks good, but I wonder how you get only 25W rigctld reading on > 70Mhz/CW and almost the same with emergency mode? > > > My SX-1000 shows 55W out with ~1.5W reflected when using normal mode > an my home made dummy load. > > Switching emergency tuner mode 70MHz/CW shows 30W out with ~0.9W > reflected with same dummy load. > > > SX-1000 should go from 1.8 to 160MHz with selected connectors. There > are another connectors for UHF 430 to 1300MHz not used now. > > I think it is not accurate, but "quite close enough" meter. > > > Current drain shows 12A for "normal" mode 70MHz/CW carrier, so > ~144Watts DC input should produce at least the measured 55W RF output > using CW. > > Curious to see Hamlib readings here after the PR is in use. > > -- > Saku > OH1KH > gm3zza--- via Hamlib-developer kirjoitti 30.5.2025 klo 17.44: >> Guys, >> >> Just tested now with CW and AM on 28 MHz and 70 MHz: emergency mode >> and not. >> >> >> Normal Mode >> Band >> >> Mode >> >> Drive >> >> Internal Meter >> >> External Meter >> >> Hamlib >> 28 MHz >> >> AM >> >> 100% >> >> ~25% >> >> 24W >> >> 22W >> >> >> CW >> >> 100% >> >> 95% >> >> 79W >> >> 94W >> 70 MHz >> >> AM >> >> 100% >> >> 25% >> >> N/A >> >> 9.6W >> >> >> CW >> >> 100% >> >> 95% >> >> N/A >> >> 25W >> >> >> Emergency Mode >> Band >> >> Mode >> >> Drive >> >> Internal Meter >> >> External Meter >> >> Hamlib >> 28 MHz >> >> AM >> >> 100% >> >> 25% >> >> 13W >> >> 12W >> >> >> CW >> >> 100% >> >> 50% >> >> 51W >> >> 46W >> 70 MHz >> >> AM >> >> 100% >> >> 15% >> >> N/A >> >> 5W >> >> >> CW >> >> 100% >> >> 50% >> >> N/A >> >> 23W >> >> >> Notes: External meter: MFJ-993C so does not read for 70 MHz >> >> So basically with my patch hamlib is now providing the user with >> figures in the right ball park. At the lower power ratings there is a >> non-linearity between the internal meter provided by IC-7300 and to >> get a more accurate translation would need using different LUTs for >> Emergency/Normal and AM/non-AM, which I reckon would be a non-starter. >> >> I will see if I can generate a pull request (I've never done one >> before!). If not I'll repost the patch file here. >> >> 73 Phil GM3ZZA >> >> ------------------------------------------------------------------------ >> *From:* Nate Bargmann <n0...@n0...> <mailto:n0...@n0...> >> *Sent:* 30 May 2025 2:36 AM >> *To:* ham...@li... >> <mailto:ham...@li...> >> <ham...@li...> >> <mailto:ham...@li...> >> *Subject:* Re: [Hamlib-developer] IC7300 output power >> * On 2025 29 May 10:48 -0500, gm3zza--- via Hamlib-developer wrote: >> > PS. I applied that patch to the pull I took this morning. >> >> I must have missed the patch. >> >> When you all get it tested either post it here or create a PR on GitHub. >> >> 73, Nate >> >> -- >> "The optimist proclaims that we live in the best of all >> possible worlds. The pessimist fears this is true." >> Web: https://www.n0nb.us <https://www.n0nb.us> >> Projects: https://github.com/N0NB <https://github.com/N0NB> >> GPG fingerprint: 82D6 4F6B 0E67 CD41 F689 BBA6 FB2C 5130 D55A 8819 >> >> >> >> _______________________________________________ >> Hamlib-developer mailing list >> Ham...@li... <mailto:Ham...@li...> >> https://lists.sourceforge.net/lists/listinfo/hamlib-developer <https://lists.sourceforge.net/lists/listinfo/hamlib-developer> > > > _______________________________________________ > Hamlib-developer mailing list > Ham...@li... > https://lists.sourceforge.net/lists/listinfo/hamlib-developer |
