A caveat regarding the use of simple "wall wart" 12v PS for supplying a OCXO.
I am using a Morion OCXO as 10-MHz reference for my K3EXREF and for
my synthesized A32 PLL in my DEMI 1296 transverter. I got reports of
120-Hz sidebands on my signal (-10dBc) turned out to be due to
excessive AC ripple riding on the 12v coming from my wall wart supply
that I was using to power the OCXO.
Using a scope I measured half a volt ripple on the 12v dc
output. Substituting a clean 12v PS eliminated the sidebands.
So be careful if you use a wall wart (many rectify with no dc filtering).
I had a 17AH battery being charged by the wall wart which I assumed
would present some filtering if 12v ran thru the battery to the
OCXO. I could have added a large value electrolytic cap to do the
filtering but I changed dc source to a well filtered Astron PS.
73, Ed - KL7UW
http://www.kl7uw.com
"Kits made by KL7UW"
Dubus Mag business:
[email protected]
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