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Re: 10GHz LNBs etc.



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.

Regards,

----- Original Message -----
From: "Jon Ogden" <na9d@mindspring.com>
To: "Murray Peterson VK2KGM" <vk2kgm@ihug.com.au>; <amsat-bb@amsat.org>
Sent: Thursday, January 04, 2001 2:43 PM
Subject: Re: [amsat-bb] 10GHz LNBs etc.


> on 1/3/01 6:15 PM, Murray Peterson  VK2KGM at vk2kgm@ihug.com.au wrote:
>
> > The DROs
> > which are the LOs do drift a bit though.
>
> This is kind of odd.  A DRO properly made should be rock solid.  With the
> types of materials available for a 10 GHz DRO puck, you can easily get Qs
in
> the range of 30,000 or so!  Additionally, the temperature stability of
these
> ceramic pucks is excellent as well.  I would think that with a Q like
that,
> once the LO is warmed up, you should be pretty solid.  Of course, though,
we
> are talking about DROs designed for consumer electronic use.......
>
> 73,
>
> Jon
> NA9D
>
> -------------------------------------
> 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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