MER Level not holding

Discussion about this major DATV Project. See https://wiki.batc.org.uk/The_Portsdown_Transmitter
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g1tzc
Posts: 20
Joined: Sun Apr 07, 2024 12:14 pm

MER Level not holding

Post by g1tzc » Wed May 07, 2025 12:09 pm

Good afternoon all,

The PicoTuner v3 has been working well but now seems to be having an issue with holding the MER. If you select Beacon MER it is sitting around 7.2 and seems constant.

However if you try to receive anything the MER is shifting from anywhere from 7.4 to -6.1. Needless to say it isn't receiving much more than a single frozen fram now and then.

Also, randomly, it has started not being able to reset the USB bus after the Waiting for Tuner to Respond. The system then goes to the Touch Centre of Screen to Return to Receiver.

Currently running version 202504290.

Thanks in advance,

Neil - G1TZC

g0mjw
Posts: 2557
Joined: Sat Sep 20, 2014 9:15 am

Re: MER Level not holding

Post by g0mjw » Wed May 07, 2025 8:44 pm

Try another USB lead and tell us what you are trying to receive because if the beacon is working maybe that's the issue, someone sending something different.

Pa3fbx
Posts: 227
Joined: Fri Oct 16, 2020 1:08 pm

Re: MER Level not holding

Post by Pa3fbx » Sat May 10, 2025 7:27 pm

LO freq is also under suspect.
The beacon is almost 2 Mhz wide.. 300 Khz off is not a problem... but on a 333 signal 300 Khz off is to mutch and the receiver might not be able to keep the fix..

So check the LO of your LNA or just try raising or lowering the LO setting in Opentuner..

Benno

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