Re: Tricky drive level setting for SDR Console to Pluto, QO100


I suspect that if you check it out Simon's 2.8 kHz filter is narrower than a conventional crystal filter's 2.7 kHz even at 30 dB down.


On 20220214 08:31:46, Siegfried Jackstien wrote:
... i am also sometimes hard to you with my mails (too much info) ... or sometimes are missunderstood from you

but its fun helping others with their setup ... i need such positive feedbacks ... that is "ham spirit" to help .. not??

sdrc v3 does not come "factory tuned" .. there are a few settings where you can finetune the receive and transmit

on the bird we should use 2.7 kc .... filters that come from factory (from you simon) are ... 2.4, 2.6, 2.8 ... but no 2.7

agc is set to 130 db ... but it works better if you set that down in the 80 to 70 db area (especially the noise reduction seems to work better that way)

and lots of other setting i made on chris´s station ...

his problem is the missing ptt on the amp ... and he has to use the evaristes datv fw to have the relay working

i am quite sure we find a working solution

greetz sigi dg9bfc

ps ... simon .. thank you for the flowers ;-)

Am 14.02.2022 um 14:36 schrieb Simon Brown:

I'm hard on Sigi at times but he's an excellent resource and tester.

Simon Brown, G4ELI

-----Original Message-----
From: <> On Behalf Of Chris
Sent: 14 February 2022 11:58
To: Simon Brown <>
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> -----Original Message-----
SB> From: <> On Behalf
SB> Of Simon Brown
SB> Sent: 13 February 2022 06:48
SB> To:
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> -----Original Message-----
SB> From: <> On Behalf
SB> Of Chris Wilson
SB> Sent: 12 February 2022 11:51
SB> To:
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

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 when posting questions or
SB> problems.

Join to automatically receive all group messages.