I've just finished building a RBW rx for 146.5MHz using the V2 Minitiouner rx combined with a BF981 preamp, 3 pole helical filter and PGA103 amp.
This gives a measured NF of 1.5dB and 28dB of gain.
The tuned input and helical filter results in BW's of 4.5MHz @ -3dB , 9.5MHz @ -20dB and 16MHz @ -40dB
Hopefully this will be adequate to keep interference out of the rx, but may reduce the total gain slightly as I suspect 28dB maybe excessive ?
Interestingly when applied to the Minitiouner the MER shoots up to 22dB from my Portsdown, but due to signal leakage from the portsdown I can't measure the rx sensitivity.
So I was wondering if there's anybody who can give me a signal for test purposes ?
FYI this rx will eventually be installed on at GB3FT with a broad 4 ele yagi beaming SSE or thereabouts and I plan on streaming GB3FT to BATC such that it should be possible to see your signal even if you'can't rx the 23cm signal directly.
can probably be available - what time ?
BTW Just bought three SL30/12 comags off ebay for £15 and set them up for 24cms DATV, I plan to loan them out once GB3FT is on site to help activity.
Hope the 146.5MHz rx proves useful as well.
As for Winterhill - I've got a good view of it out of the shack window, but sounds as though Mike will be on the 'wrong side' for me.