I just found my old MFG units....
Nice day today - sunshine. So I
have just installed a filter in front of the LNA to avoid damage from 13cms
(thanks Simon) - both now on a 1.2m dish.
Testing it was not without
problems. I can not currently hear the GB3MHL beacon - not at all, nothing,
which is most worrying, a deaf RX. I can hear Bristol beacon though and some
curious FM like noise where GM3MHL should be. So, naturally I thought the LNA
must be oscillating owing to the poor out of band match of the new filter.
Sure enough looking at it on the analyser I could see a strong signal on
1318.5 but oddly for a LNA oscillation, it seemed to peak up with the dish
aimed at 60 degrees.
Putting that frequency into Google came up with
GB3TV, which is what it is, and P5 strength. I have never seen it before. This
reminded me that the comtech modules do a fairly poor job as a receiver. Video
quality is not good.
Now - why can I no longer hear MHL and what is
transmitting what sounds like wideband FM on its
frequency?
Mike
