[R-1051] Frequency standard module

[Cecil Acuff]

Greetings group,

           I have been out of town for nearly a week on business and am
catching up on the posts.

I have not experienced any failures of the Crystal in the Frequency
Standard.  I do find the 5 Mhz osc dead quite often though.  I find
components in the oven that fail because of the temperature they are exposed
to all the time.  Why they put all that in the oven is a mystery.  The items
that seem to fail most often are the two electrolytic caps.  It's not
unusual to find them shorted.  I have started replacing them as a matter of
course when doing a repair/restoration.  The next highest failure item is
the temperature sensor that is embedded in the base of the oven.  It usually
goes open and the oven fails to work.  It is a special part and quite
expensive....around $10 for something that looks like an 1/8th watt
resistor.  But don't try a 3900 ohm resistor...it won't work.  Been there
done that!

The Standard is very repairable with most of the problems being on the 5 Mhz
osc\oven control card.  I have found some that are damaged because it
appears the oven has run away and gone as far as melting the solder on the
back side of the board.

The oven does need to be set to 85C\185F for the stability to be to spec's.
Too low or high and you fall off that curve that Bob mentioned.  It takes a
while to get it adjusted....also you should only set the frequency after the
oven is calibrated and the cabinet has been closed up and temperature
stabilized over night.  You have to slide it open make a quick adjustment,
close it back up tightly and check it again in a half hour or so.  Once set
it usually won't drift more than a half cycle in 24 hours if all is well!

The price you pay for that stability is the half hour to one hour necessary
for the radio to get on frequency when powering it up cold.  I don't know
any way to get around that unless the radio is modified to power the oven
continuously.

Mark I have found the R1051 plain to be a little harder to sell than the
"B".  It is every bit as good a radio...but everyone wants a "B".  I prefer
the plain modules because they can be repaired.  Some of the IC's in the "B"
synthesizer are non-existent!  If one goes bad you scrap the module....

I would guess a complete, unrestored, untested Plain to be worth around $150
with decent cosmetics....( lack of front panel and chassis corrosion, broken
knobs etc....)

It's not unusual to have to put 40 or 50 hours into one to get it up to
spec.  Not to mention parts.... Once that is done you can usually get up to
around $500 if the cosmetics are pleasing.  The "B" usually will support
$100-$150 more and that is supplying new audio and power connectors and rack
mount hardware.

Cecil Acuff
The R1051 Shop

www.r1051.com

----- Original Message ----- 
From: "Mark Masin" <mmasin at atc-us.com>
To: <r-1051 at mailman.qth.net>
Sent: Wednesday, May 14, 2003 10:14 PM
Subject: Re: [R-1051] Frequency standard module


> Gary
> Hi there. A word of caution and advice. You can take it anyway you want.
> I suggest that you don't put your home phone number down, especially
> since you give a po box number. If you take a phone number and enter it
> into google.com it will come up with a name and address for that phone
> number. As long as the phone is listed it's like having a reverse phone
> book for the whole country.
>
> speak to you soon.
> mark
> as far as the R1051's are concerned. I still have about 50 each left. Do
> you think it makes sense to list them. They are the 'plain' version.If
> so, how much are they worth?
>
> mark
>
> Gary Gleicher wrote:
>
> >At 11:58 AM 5/14/2003 -0700, you wrote:
> >
> >
> >>Gary, I believe that we have done business before... I
> >>am interested in one of your frequency standards...
> >>Zip is 38124 in Memphis, Tenn...  73's  WALLY  K5OP
> >>--- Gary Gleicher <vigar.gary at verizon.net> wrote:
> >>
> >>
> >----------------------------------------------------
> >
> >Hi Wally,
> >
> > It's possible that we've done business before, lately
> >I'm lucky if I remember to tie my shoe laces (HI). Shipping is $5.75,
> >so total will be $40.75. Thanks.
> >
> > Gary Gleicher
> > P.O. Box 427
> > Little Neck, NY 11363-0427
> > 718-423-1906
> >_______________________________________________
> >R-1051 mailing list
> >R-1051 at mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/r-1051
> >
> >
> >
>
>
>
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