On Thursday 16 September 2004 00:12, Alan Melia wrote:
P.S for the RX builders Order code 12-0274 is the GEC-Plessey
SL6440 high performance mixer, mis-described as a "complete radio
IF chip". These are very good performance double balanced mixers
(Gilbert cell I think) as used in the AOR 7030, and many high end
receivers.( I think they mixed it up with the SL644/1644 which is
an FM IF chip.) These are very hard to get these days and although
a little old now, can only be outshone by the likes of Colin
Horrabin's H-mixer, I believe.
SL6440 is a good mixer, low IMD but high noise. For HF receiver it
require a preamplifier also for 7 MHz band.
73 de Claudio, ik2pii
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Claudio Pozzi - Happy Linux User - http://www.qsl.net/ik2pii
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