Faster AGC recovery is possible?
Faster AGC recovery is possible?
HI, this is José (EA2KV), new on the Community. Greetings from Spain.
Im using a SDRplay RSP2pro as RX, TX is my HF rig + ELAD TX/RX switch box.
I would like to understand how I can make the reception to recover faster from TX, main concern is during contest, when the RX is back I already mised the call sign prefix.
Current setup:
-Automatic mute: ON.
-AGC: Fast
-Rest of other default AGC configurations remains as standard setup on the menus.
-Normal RX signal during my my transmision is 9+60dB.
Thanks in advance for your advices.
José
Im using a SDRplay RSP2pro as RX, TX is my HF rig + ELAD TX/RX switch box.
I would like to understand how I can make the reception to recover faster from TX, main concern is during contest, when the RX is back I already mised the call sign prefix.
Current setup:
-Automatic mute: ON.
-AGC: Fast
-Rest of other default AGC configurations remains as standard setup on the menus.
-Normal RX signal during my my transmision is 9+60dB.
Thanks in advance for your advices.
José
Last edited by EA2KV on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason
Reason: No reason
Re: Faster AGC recovery is possible?
It is likely the delay is caused by the inherent latency of SDRs. There is a discussion of this at QRZ at this link: https://forums.qrz.com/index.php?thread ... ys.500423/
It should be fairly easy to measure the delays by making a simultaneous recording of the output of an SDR on one stereo channel and the output of a 'real' radio on the other stereo channel, when tuned to the same signal. Audacity could be used to measure the delay time. By real radio, I am referring to one that doesn't do any digital signal processing.
73's, Mike
It should be fairly easy to measure the delays by making a simultaneous recording of the output of an SDR on one stereo channel and the output of a 'real' radio on the other stereo channel, when tuned to the same signal. Audacity could be used to measure the delay time. By real radio, I am referring to one that doesn't do any digital signal processing.
73's, Mike
Reason: No reason
Re: Faster AGC recovery is possible?
I have measured the audio latency and it is 300 to 450 milliseconds (varies depending on computer/USB performance). Even without the AGC response delay this is not suitable for contests. The best idea for a contest is to use an RF splitter in your SDR switch and receive your audio on the transceiver with the RSP functioning only as a tracking panadapter.
If your receive level during transmit is S9+60 dB you might look at ways to lower the level into the RSP during transmit. Better cable shielding and using a relay to short the RSP input during transmit. The latest MFJ switch (the "B" model) uses a separate relay to short the input. Make sure you use a quality USB cable with Mix 31 ferrites to reduce signal pickup.
Roger
If your receive level during transmit is S9+60 dB you might look at ways to lower the level into the RSP during transmit. Better cable shielding and using a relay to short the RSP input during transmit. The latest MFJ switch (the "B" model) uses a separate relay to short the input. Make sure you use a quality USB cable with Mix 31 ferrites to reduce signal pickup.
Roger
Reason: No reason
Re: Faster AGC recovery is possible?
Mike and Roger,
Tks so much for the comments.
Will keep working on these directions.
Tks. José.
Tks so much for the comments.
Will keep working on these directions.
Tks. José.
Last edited by EA2KV on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason
Reason: No reason