[R-1051] Frequency standard module

[Cecil Acuff]

Hi Steve and Group,

        First of all let me say thanks to Andy for his work in getting a
manual out there in electronic format.  It is quite an undertaking.  Thanks
Andy....hope your server didn't smoke!

Steve most of the standards I have seen have this regulator board
removed...the ones that I have seen with them in have had 27 volts output
best I remember.  I think that is why the military removed them...didn't
make much sense to regulate 28 vdc down to 27 vdc...

As far as the standard with the slug tuned circuits...I have only seen one
of them through the shop.  I think one contractor must have built those and
all the rest did the more standard cap tuned units.  I have "Plain", B, D
and H model manuals and none of them have schematics for the slug tuned
variant.

I'll keep an eye out but am beginning to believe that there were very few of
those and they didn't make it into the standard manuals.

Cecil Acuff
"The R1051 Shop"
www.r1051.com

----- Original Message ----- 
From: "Steve Hobensack" <stevehobensack at yahoo.com>
To: "r1051 radio" <r-1051 at mailman.qth.net>
Sent: Sunday, September 14, 2003 7:49 PM
Subject: [R-1051] Frequency standard module


> Look at the schematic diagram of the frequency
> standard module. There is a small voltage regulator
> board that drops voltage and sends it to the oven
> circuit. It is marked as "27 volt regulator". Could
> this be a misprint ? The voltage on my unit measures
> 17v. The zener diode references out to near 17v in my
> parts books. I have found a couple modules where this
> regulator board has been removed and the oven wired
> straight to the 28v source. Should the temperature
> circuit fail, it will really cook the crystal circuit
> board.
>
> Also , I am still looking for a schematic diagram for
> the frequency standard module that uses slug tuned
> transformers instead of trimmer caps. Thanks
>
> Steve......KJ8L
>
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