[R-1051] frequency standard module

[Steve Hobensack]

Hello Cecil, 
   Thanks for the help on the module. The oven on this
one is rectangular. It is not possible to remove the
metal vessel from the plastic foam. I wanted to check
out the heating element. There is no evidence of a
heating element, or a bridge resistor embedded in the
bottom like my other frequency module.
   According to the description of the module that
Fair is selling, it is supposed to come with a
schematic , this one didn't. Fair guarantees that is
will put out a 5 mhz signal only. I consider myself
lucky that the other outputs were working. I'll have
to contact Fair and see if they can come up with the
right schematic (lots of luck).
 Cul......Steve....KJ8L
--- Cecil Acuff <chacuff at datasync.com> wrote:
> Hi Steve and group,
> 
>         I checked the "D" manual and also looked at
> a Freq. Standard that I
> received from Fair a while back.  Mine was
> unserviceable.  It had been
> cannibalized for the connector and cables.  The
> crystal oven is cylindrical
> with the heater wound around the outside of a metal
> vessel.  All of this
> slides into a cast aluminum housing.  The A1 board
> has probably 8 or 10
> transistors most are 2N1225's.  The osc and oven
> control board is mounted
> below the metal vessel that the crystal is in and
> sandwiched between a cover
> that attaches to the top of the casting.  This all
> matches the pictures and
> board layouts in the "D" manual.  Yours may be a
> later model that moved to
> Silicon transistors instead of Germanium (2N1225). 
> I would be happy to send
> you this one if you think you could use some of the
> oven control parts.
> 
> I have found if the oven is not working you can't
> get it on freq without a
> lot of tweaking and it is not nearly as stabile as
> when at 185 F (85C).
> 
> You were also right in that there seems to be no
> oven temp. adjustment
> pot.....kind of strange.
> 
> Hope that helps...
> 
> Cecil...
> 
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