6m DATV Sporadic E

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M0DTS
Posts: 550
Joined: Sun Feb 24, 2008 9:03 pm

6m DATV Sporadic E

Post by M0DTS » Mon Jul 04, 2022 5:12 pm

Hi All,

I'm now setup again for DATV on 51.7MHz.
If any European (or uk) stations want to try I can be available for tests.

Tx: Adalm Pluto, 100W DVB-S2 to 5el Yagi
Rx: PGA103 LNA > narrow Band Pass Filter > Ham-it-up converter to 176.7MHz for Minitioune Rx.

I Prefer 125Ks as I have QRM either side of 51.7, but 250Ks maybe possible.

Rob
M0DTS
IO94IL

My Rx Spectrum below, this is after phase/amplitude cancellation of a lot of noise!
The two peaks along with many smaller ones wander about +/-50KHz.
I have to improve the noise gathering antenna a bit yet........
6m Rx M0DTS.jpg
6m Rx M0DTS.jpg (123.28 KiB) Viewed 262 times





UPDATE!!
An hour later and a better 'noise reference' antenna i have reduced the QRM a lot!
Spectrum vs Rx with 125Ks test signal.
This should be sensitive enough now:

20220704_185654.jpg
20220704_185654.jpg (120.98 KiB) Viewed 257 times
20220704_185701.jpg
20220704_185701.jpg (191.09 KiB) Viewed 257 times

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