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Re: 10GHz LNBs etc.



Good points, Murray.  You're right.  Yes, I suppose the best thing is always
to lock the DRO with a PLL, but obviously in the consumer DSS product, the
free running stability is enough.

73,

Jon
NA9D

on 1/4/01 5:04 PM, Murray Peterson  VK2KGM at vk2kgm@ihug.com.au wrote:

> The Dilectric can be temperature compensated but anything which moves with
> temperature near the puck can cause a frequency change. They are good but
> 100 Hz can make a difference for SSB and 100Hz in 10000000000Hz is 1 part in
> 100000000 which is very good but noticeable. The LNB is usually out in the
> weather and so has lots of temperature changes to "live" with.
> 
> They say that a PLL LO using a Temperature compensated/controled crystal
> oscilator as the reference is more stable. Comercially, DROs are made with
> varactor diodes in them so they can be phase locked to a temperature
> controled/compenstaed crystal reference.


-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)

Member:  ARRL, AMSAT, DXCC, NRA

http://www.qsl.net/ke9na

"A life lived in fear is a life half lived."

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