QRM on Oscar 100

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G4uvz
Posts: 162
Joined: Sat Dec 09, 2017 10:30 am

QRM on Oscar 100

Post by G4uvz » Wed Jul 10, 2019 7:39 pm

Switched on this morning and the usual MER of 8 + on the beacon was just 4 and a bit

Checked on Goonhilly and all looked normal.

Out to the dish to see if the LNB was at 7 o'clock..all OK

Yesterday I re-instated my wideband 10 Ghz link to my friend G4UTM 8K across the valley ...an lnb turned inside out to transmit on 10Gz with about

10 mW output on 10370 ..the dish is behind the 1.2 M dish pointed at Oscar 100 but obviously enough adjacent signal to upset Minitune !

Switched off the tx and 8.3 MER restored

g0mjw
Posts: 904
Joined: Sat Sep 20, 2014 9:15 am

Re: QRM on Oscar 100

Post by g0mjw » Wed Jul 10, 2019 8:04 pm

Capture.JPG
Capture.JPG (343.34 KiB) Viewed 482 times
QRM - blocking perhaps or wideband noise.

The beacon signal also goes down when other signals are on the transponder.

G4uvz
Posts: 162
Joined: Sat Dec 09, 2017 10:30 am

Re: QRM on Oscar 100

Post by G4uvz » Thu Jul 11, 2019 2:08 pm

MER 10.2...how big is your dish!!??

g0mjw
Posts: 904
Joined: Sat Sep 20, 2014 9:15 am

Re: QRM on Oscar 100

Post by g0mjw » Thu Jul 11, 2019 3:00 pm

It's 10.5 - 10.6 when other stations are not on. The dish is 2.4m but I am concerned it is not optimum as others (including me) see similar figures with 1.2m dishes. However, the maximum MER is limited by the uplink so above 10 it's difficult to see differences.

Mike

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