[time-nuts] Restoring GR 1120-AB Frequency Standard

wa3frp at aol.com wa3frp at aol.com
Sun Aug 24 00:32:06 EDT 2008


Peter,

Thanks for the posting and the link.

I believe that the 1115-B was the successor to the GR 1113-A that I am 
restoring. It combines a number of the features of the 1113-A and 
1114-A in the same chassis along with a self-contained 24 emergency 
power supply. Note that the crystal oven design was completely 
revamped. No double oven. Lower power requirements.

The 1120 was described in the April 1961 issue of GR Experimenter.

Best Regards,
Russ WA3FRP


-----Original Message-----
From: Peter Putnam <pico.2008 at sbcglobal.net>
To: Discussion of precise time and frequency measurement 
<time-nuts at febo.com>
Sent: Sat, 23 Aug 2008 6:47 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard



I've posted some General Radio notes and specifications on their Model
1115-B oscillator, hoping there might be some relevance to the Model 
1120.

Product specific information starts on page 8.

http://www.ni6e.com/genrad/

Regards,
Peter
NI6E


Max Robinson wrote:
> There must have been several different versions of this unit. The
> oscillator I have is 5 MHz. The frequency dividers in the rack I got 
it out
> of were discrete transistor construction. Seems to me the clock used 
a 25L6
> although I don't remember how they derived the heater voltage. There 
was
> also a phase locked frequency multiplier with outputs at 10 MHz, 100 
MHz and
> 1 GHz. The frequency divider module had outputs down to 1 PPS.
>
> After typing that I'm not sure the oscillator frequency is right. 
Maybe
> it's 1 MHz. I'm sure it's not 100 kHz.
>
> Regards.
>
> Max. K 4 O D S.
>
>

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