Re: Tricky drive level setting for SDR Console to Pluto, QO100
Agreed - and stubborn, too.toggle quoted messageShow quoted text
On 20220214 05:36:54, Simon Brown wrote:
Hi, I'm hard on Sigi at times but he's an excellent resource and tester. Simon Brown, G4ELI https://www.sdr-radio.com -----Original Message----- From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Chris Wilson Sent: 14 February 2022 11:58 To: Simon Brown <main@SDR-Radio.groups.io> Subject: Re: [SDR-Radio] Tricky drive level setting for SDR Console to Pluto, QO100 Hello Simon, Sunday, February 13, 2022 Sigi DG9BF most kindly logged on to my PC via TeamViewer last night and spent a long time optimizing my SDR Console set up. He concurs with me that my issue is one of fickle drive level requirements for the SG Labs 20W amp which is currently triggered by the amps own internal VOX circuitry. Enough drive to trigger the VOX is often enough PA output to trigger that whining bint, Leila ;) He recommends I use a conventional PTT relay circuit. This may be a bit tricky in itself, as the Pluto firmware needed to control the Pluto PTT relays over my LAN (the Pluto is outside by the dish) is not, as far as I know, compatible with my DATV Portsdown 4 box, which only works with a very old firmware... I need to bend Sigi's ear about this at some time. Thanks for the replies Simon, Sigi is a fantastic ambassador for your software, treat him kindly! Best regards, Chris 2E0ILY mailto:chris@... SB> One thing - you can always use the mouse wheel to adjust a slider. SB> Simon Brown, G4ELI SB> https://www.sdr-radio.com SB> -----Original Message----- SB> From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf SB> Of Simon Brown SB> Sent: 13 February 2022 06:48 SB> To: main@SDR-Radio.groups.io SB> Subject: Re: [SDR-Radio] Tricky drive level setting for SDR Console SB> to Pluto, QO100 SB> Hi, SB> A few screenshots would help. SB> Simon Brown, G4ELI SB> https://www.sdr-radio.com SB> -----Original Message----- SB> From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf SB> Of Chris Wilson SB> Sent: 12 February 2022 11:51 SB> To: main@SDR-Radio.groups.io SB> Subject: [SDR-Radio] Tricky drive level setting for SDR Console to SB> Pluto, SB> QO100 SB> 12 February 2022 SB> I wonder if anyone can kindly help me with a drive issue I am having SB> with my PlutoSDR and transmitting to the QO100 satellite via the SB> narrow band transponder using SDR Console please? SB> Recently I am finding setting the drive level is incredibly tricky. SB> Using the Tone or Tune functions in SDR Console a tad too much drive SB> level and the Leila, the satellite's too great a signal level SB> warning is triggered. I reduce drive until it is no longer triggered SB> and all is OK for some seconds, then it is triggered again, as if my power is increasing of its own accord. SB> Once I find an acceptable level by very fine manipulation of the SB> drive slider but I then find that after a period of reception there SB> is no longer enough drive to set the Pluto / amp into TX again. SB> This appears to be a recent problem, as a while ago when I was on SB> the narrow band transponder with SSB I didn't seem to have so much of an issue. SB> My set up is Windows 7 64 bit, SDR Console V 3.1, LAN connection to SB> my Pluto at the base of my 1.8 meter prime focus dish. The Pluto is SB> driving an Analogue Devices CN0417 pre amp driving an SG labs 20W SB> amp via a 6dB attenuator, which in turn is triggered by its VOX PTT. SB> The SG Labs amp then feeds the POTY antenna via a short length of low loss co-ax. SB> MAYBE the attenuator is between the Pluto and the CN0417, I can't SB> reliably recall, and I am at work. SB> My own, novice, thoughts are that to trigger the SG labs amp via VOX SB> is needing enough drive power to put its output around the trigger SB> point of Leila. Does that sound feasible? What about the rise in SB> output when TX'ing, and the fact a signal level adjusted down when SB> operating with Tune or Tone to stop triggering Leila becomes SB> insufficient to set the ensemble into TX at the next transmission? SB> Thanks for any advice. I could JUST get a signal on SSB with only SB> the CN0417, before I got the SG labs amp. I wanted a good deal more SB> power as I also run the set up on DATV on the wide band QO100 SB> transponder. Best regards, Chris, 2E0ILY SB> -- SB> Best regards, SB> Chris mailto:chris@... SB> -- SB> - + - + - SB> Please use https://forum.sdr-radio.com:4499/ when posting questions or SB> problems.