Search found 38 matches

by MTG
Mon Oct 22, 2018 9:23 am
Forum: SDRuno
Topic: Shift in output levels on DUO
Replies: 12
Views: 6314

Shift in output levels on DUO

I am experiencing an issue that I raised with the SDRUno team a couple of years back with my RSP2 and was not resolved - I had to live withit :-( . I now have a Duo and am experiencing the same issue. I run my systems 24/7 and use a GPS disciplined oscillator as a level and frequency calibration. Be...
by MTG
Sat Oct 20, 2018 8:15 am
Forum: SDRuno
Topic: RSPDuo and two VAC streams
Replies: 2
Views: 2029

Re: RSPDuo and two VAC streams

Oh! I had thought that highlighting the RX Control AGC button turned off the AGC and rendered all AGCs inoperative! How does that work then? When I looked at the EXW I found the settings were different and adjusting them both to the same (100) position and still can't balance the inputs to Spectrum ...
by MTG
Fri Oct 19, 2018 5:24 pm
Forum: SDRuno
Topic: RSPDuo and two VAC streams
Replies: 2
Views: 2029

RSPDuo and two VAC streams

Having set up a single tuner of my Duo with the help of Roger (see Optimisation of IF and RF gains) I moved on to using the two tuners in Normal Dual mode. I then spent a day trying to get the other tuner working in the same way. I used VB VACs for streaming the output of the two tuners to separate ...
by MTG
Fri Oct 19, 2018 5:02 pm
Forum: SDRuno
Topic: Optimisiation procedure for IF and RF level settings
Replies: 10
Views: 5519

Re: Optimisiation procedure for IF and RF level settings

An update for Roger The tutorial on setting up the RF, IF and VAC was most useful - thanks. My calibration signal level is way lower than I thought. The output had been measured when I was using a different supply voltage for the gps unit; I then decided to run it at lower voltage to ensure no overh...
by MTG
Sat Oct 06, 2018 3:12 pm
Forum: SDRuno
Topic: Optimisiation procedure for IF and RF level settings
Replies: 10
Views: 5519

Re: Optimisiation procedure for IF and RF level settings

I use a 3 port directional coupler to inject the calibration signal: the antenna signal passes straight through the coupler to the output port; the directional port "mixes" with calibration signal 25 dB down, with the antenna signal and is isolated from the antenna by about 50 dB. The signal to nois...
by MTG
Fri Oct 05, 2018 10:23 am
Forum: SDRuno
Topic: Optimisiation procedure for IF and RF level settings
Replies: 10
Views: 5519

Re: Optimisiation procedure for IF and RF level settings

Roger, I am going to be away for a week and thought I should add these two images showing the calbration, maximum meteor signal and noise levels from two systems - F using Funcube Dongle straight to Spectrum Lab and SP usinf RSPDuo, SDRUno , VAC into spectrum Lab. The latter shows recent twiddles to...
by MTG
Fri Oct 05, 2018 9:57 am
Forum: SDRuno
Topic: Optimisiation procedure for IF and RF level settings
Replies: 10
Views: 5519

Re: Optimisiation procedure for IF and RF level settings

Roger, A powerful space surveillance radar in France transmiits 24/7 on 143.050 MHz. I collect the Doppler shifted scatter from meteors illuminated by that radar. I tune to 143.048 to give me positive and negative shifts from that central frequency. I collect data 24/7. Here is the RX window SDRUno ...
by MTG
Thu Oct 04, 2018 8:05 am
Forum: SDRuno
Topic: Optimisiation procedure for IF and RF level settings
Replies: 10
Views: 5519

Re: Optimisiation procedure for IF and RF level settings

Roger thanks for the reply. I will follow the procedure you have outlined. However, for my application I do not wish to use AGCs - I am monitoring meteor scatter 24/7 and signals can have fairly large dynamic ranges that I do not wish to lose. The signals last for from a fraction of second to occass...
by MTG
Wed Oct 03, 2018 3:39 pm
Forum: SDRuno
Topic: Optimisiation procedure for IF and RF level settings
Replies: 10
Views: 5519

Optimisiation procedure for IF and RF level settings

How do I go about optimisiation IF and RF level settings for best SNR?
I tried to do this with a RSP2 Pro some 18 months ago and had to give up and use SDR Console. However, I have now got an RSP Duo and this is not supported by Console yet.
by MTG
Fri Jul 13, 2018 9:31 am
Forum: SDRuno
Topic: Time domain amplitude analysis?
Replies: 4
Views: 2839

Re: Time domain amplitude analysis?

For time amplitude spectrogram you can feed the audio output directly to an excellent piece of freeware, Spectrum Lab which can easily be found on an internet search.

Mike
Hayfield
UK