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TOPIC: FT8 Transmit Problemss

FT8 Transmit Problemss 18 Jul 2020 18:56 #1

  • KI5FTY
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Hi - I have strange broadband spikes in my transmission on FT8. It does not happen all the time - about 1 out of 3 transmissions. I have included some screen shots. Any ideas?
Thanks


ft8-strangeness.png

Annotation2020-07-18134947.png
Lou ki5fty
Last Edit: 18 Jul 2020 18:58 by KI5FTY. Reason: add screensots
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FT8 Transmit Problemss 18 Jul 2020 19:01 #2

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Is this a first time transmission on FT8? Or was it good and just gone bad? If the latter, has anything changed - software, OS version. Any info would help diagnosis.

We also need to know a few basics like the ESDR2 settings for digital TX, whether you are hard wiring to a sound card or using VAC. If VAC what software and version.
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FT8 Transmit Problemss 18 Jul 2020 19:06 #3

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I am running windows 10 with the latest updates. It has been doing this for a while. (3-4mos). I have other SDRs I run on the same machine without this problem (Hermes Lite 2, Elad FDM duo) running both in SDR Console, PowerSDR and ELAD-FDMSW2. Neither have this issue.
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FT8 Transmit Problemss 18 Jul 2020 19:34 #4

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OK, but without the information I asked for there is no way to diagnose at a distance. Most likely a ESDR2 settings issue but no way to tell for sure. You could ask Roman direct by email to him.
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FT8 Transmit Problemss 28 Jul 2020 08:29 #5

Hello from JA.
I am suffering from the same symptoms.
I checked many things such as VAC and LAN connection, but it didn't get fixed.
Recently, I have given up because there is no actual harm.......
Is FT8 OK for everyone?
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FT8 Transmit Problemss 28 Jul 2020 08:44 #6

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FT8 / VAC problems occur after Windows Update to version 2004 (released May / June this year) and if Muzychenko VAC is employed.

To solve: download latest VAC version 4.64 and use these settings:

Use WavePCI on both RX and T.X
Set MS per Int to 5 for TX and 3 for RX.
In ESDR2 VAC settings, set Buffer to 256 Samples.

Whilst the use of DIGu should mean all audio enhancements are off, some users report that Limiter remains effective if set to on in PROC. This should be turned off for FT8.
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The following user(s) said Thank You: Rome

FT8 Transmit Problemss 02 Aug 2020 14:00 #7

>set Buffer to 256 Samples

Great! It seems that my problem is solved with this!!
This tip was very helpful.
Thank you very much, Erik SAN !!
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