FW: [Premium-Rx] Clean LOs

[Brian D. Comer]

-----Original Message-----
From: Brian D. Comer [mailto:bcomer at cox.net] 
Sent: Friday, February 11, 2005 4:00 PM
To: 'Michael O'Beirne'
Subject: RE: [Premium-Rx] Clean LOs
 
I do not support the idea that frequency synthesizers are necessarily a
problem and would not consider the using of anything else for a high
performance receiver today. That is not to say that they are necessarily
good and I find the ones in the RA 6830 an example of a bad design or at
least bad implementation. There are of course may other very poor
synthesizers out there.
 
On the great HP 8640, many years ago I had access to one when it had
only just been released to the market. I took it home and used it as an
LO for a home brew 2 meter transceiver. The reports that I received were
that I had very bad FM on the my signal. The HP 8640 uses a frequency
locked loop which can very easily be frequency modulated by strong
signals, so take care when use it as an LO.
 
73 Brian
 
KF6C/G3ZVC
 
-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Michael O'Beirne
Sent: Friday, February 11, 2005 1:49 PM
To: Premium-Radio
Subject: [Premium-Rx] Clean LOs
 
Dear All,
 
One quick idea to see what a really clean LO can do for a receiver might
be to disable the internal synthesiser and feed in some RF from a good
HP8640B genie or similar from R&S.  G3OSS (Angus McKenzie) did this at
VHF with a professional VHF receiver and was much impressed.
73s
Michael
G8MOB
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