here one from ON7ATV
nice to see my pics
Probably i missed something about this project.
Where can i find more info about the "high speed modem".
I presume it's a software solution or ........
A search on this forum did not help me.
I found the site from DJ0ABR. ( as you can see in the top of the images a call-sign).
But i would like to see if there are some users experience.
i do some test now at 10.489.580.00 in diffrent speeds grtz the Alain
Installation of the High Speed Modem on my 64Bit Windows-10 computer, peace of cake.
The only problem till now is the USB-Audio connection
My IC-9700 is in USB-D mode (Rx and Tx)
I did a test with KG-STV that works fine, so the USB-Audio connection must be good.
( The IS0GRB wed-sdr did received a picture from me )
Playing around now a couple of hours with the audio part without success.
What do you guys have for info on the command screen (you can see my error).
Till now i can report that:
This cheap USB Soundcard does not work (good): https://www.amazon.in/Oxyura-C…und-Adapter/dp/B007HISGRW
This virtual audio cable does not work (at all!): https://vb-audio.com/Cable/
I had to uninstall this VC to get the HS Modem running!!!
This virtual cable works: (lite version) https://vac.muzychenko.net/en/
Tried to get it running since 2 hrs....no chance
Installed it Step by Step as Described for AdalmPluto, using SDR-Console 3.0.26 on WIN10PC 64-Bit I5
Using VAC Full Version.
RX-SIGNAL is GREEN, But no Synchronisation
will loking forwardo....i think i must figure out how VAC Signallevel must adapted
1. I Forgot to set AGC
2. Without GPSDO Synchronisationon TX it is not workable ????
Forgot to tell that also Receiving is not possible. I have no Idea what i am doing wrong
SSTV and RTTY is possible with other Programms
Do you use a raspberry Pi 4 as Modem?
My TRX is the ICOM IC-9700
Modem is running on my PC
Good morning everybody.
I have the problem that although the audio settings are marked ok with the green arrows, the IP adress shows up twice for about two seconds, then changes to red again. Firewall settings are ok.
after testing it and figured out that it is actuall "tricky" to get it synchronized with QSO-Partner.
ACTUAL if i want to send an ASCII File the Software Stopped immediately when i will send it.
One day before it works ....curios
Win10>AdalmPluto TCXO; BullsEye LNB not modified. All Parameter's used as described in Documentation by DJ0ABR
dl4sdr : if the ASCII file is to small ca <10bytes the modem crashes.
with a longer file it works (at least here).
About the sync i fully agree with you.
Even with OCXO or SW-Stabilisation some 100Hz difference between transmitter and receiver could arise.
With a difference of only 50Hz the modem won't sync with the higher bitrates.
Maybe a short "pilot tone" on 1500Hz on the start of the transmission could set the receiver to the real freq.
+/- 100Hz are enough for that.
I don't know if ABR is reading this and if he is interested in such suggestions.
Hallo my frieds,
yes, I am reading all these suggestions, and have already done some of them. I.e. the pilot tone suggested by DB8TF is implemented in the actual version 0.64.
The pilot tone is a little peak at 100Hz. And the spectrum display has a red 100 Hz line for tuning.
I am currently working to fix a very complex issue, I rewrite the Windows Audio Driver, which is quite complex to get it reliably working. Unfortunately all the free, open software for Windows Audio has many problems, so it was neccessary to fix that. This will take about one week, then I publish a new version.
The question from here and from emails are answerded in a new FAQ on https://www.dj0abr.de/dokuwiki/doku.php?id=de:start
When the current work on the audio driver is finished, I will have more time to participate here in the forum.
the 100Hz Pilot tone is nice to manually adjust the RX frequency but something that works automatic would be better.
If i look at the signal then i see that the first 2-3 seconds some sync signal is send and after that the real data.
Maybe it could be possible to take 100-200ms from that "preamble" and send a 1500Hz tone instead.
WIth this "peak" the RX side could measure the actual frequency difference and could sync much better.
In real use: the last few days i let the modem receive in picture mode on .580 with SR 4410 and only a fraction of the OMs transmitting are capable of adjusting the tx freq so accurate that the rx side is on lock fast enough.
WIthout a automatic "frequency offset" correction this HS Modem is barely usable in "stand alone" mode..