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tweaking latency in digital modes ?
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Andrew O'Brien
Member ✭✭✭
I'm not sure if it is really a SmartSDR issue or not, but using SmartSDR I am having a timing issue using VARA with Winlink Express. Using an Icom I do not get this issue. Winmor works fine with same software but not VARA and SSDR. It looks extremely close , gaining a few milliseconds could make the difference. Any suggestions for doing this ? Seems I am switching to transmit a few milliseconds too early and the gateway and I are not formally connecting. The mode requires 2.4Khz filter width. I have been using the standard 2.7 under Digu... I am not sure if a custom 2.4 filter would make any difference.
ANdy K3UK
ANdy K3UK
0
Answers
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How about some TX Delay, to slow it down just enough. It's in the settings psnel1
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Thanks, will try. Does the "TX INHIBIT" enable option need to be enabled for TX to start ?0
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No. Tx inhibit = rx only0
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You can try reducing the RX filter latency. In SSDR go to Settings->Radio Setup->Filters and select Low Latency for the mode in question. I'm a little confused - you said you were using a 2.7 kHz filter under DIGU, but that is not one of the selections I have under DIGU, only on SSB.
73,
Doug K4DSP
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Andy-I am just trying to setup Winlink with VARA HF Modem on my Flex 6400 - did you ever get your setup to work correctly? I can not seem to establish a link connection - Tom WA2ANG0
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Sadly , no . I sold the Flex and got a 7300 . Connected first try to a server I had been trying for weeks to connect to with the 7300. Same when I ran a server , as soon as I tried the Icom users were able to connect to me . I later sold the 7300 and moved up to a 7610 . The 7610 had no issues and this week I got a Icom 705 and was able to connect . I imagine that if ai had worked at it long enough In would have solved the presumed latency issue by adjusting the settings . I tried but lost patience .
Andy K3UK
0
This discussion has been closed.
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