[R-1051] R-1051G manual on line

[David Wise]

Paul,
There's no PLL in there.
In the EXT (NORMAL) and EXT (OVEN STBY) positions, an external signal will cause the Frequency Standard Assembly to use it instead of the internal crystal, but there's no phase locking involved.  The internal oscillator continues to free-run, while U1, U2, et. al. route the external signal to the dividers.
In the INT/COMP position, external switchover is suppressed, and Phase Detector U1D drives a lamp for comparison between the internal and external standards.

If I'm missing your point, please clarify what you're looking at.  I'm looking at Nick's R-1051G manual,
EE125-AD-OMI-010, Figure 5-36, Frequency Standard Assembly, Maintenance Schematic Diagram, page 5-133 (289 in pdf),
zones 12D through 14F.

Regards,
Dave

I was never in Service, but I have the impression that most R-1051's ran nonstop pounding Fleet Broadcast into the crypto box and from there a bank of teletypes.
________________________________________
From: r-1051-bounces at mailman.qth.net <r-1051-bounces at mailman.qth.net> on behalf of paul swed <paulswedb at gmail.com>
Sent: Tuesday, July 11, 2017 10:22 AM
To: R-1051 Discussion Group
Subject: Re: [R-1051] R-1051G manual on line

Dave
Indeed a good question. But then why does the frequency reference module
call the circuit out as a PLL?
Some of the better HP counters do indeed work as follows the internal
reference free runs when no external reference is provided. When a
reference is provided it locks to that reference.
All I am saying is the schematic on the G says something thats not making
sense.

With respects to stacks of r1051s we had I think 4 racks with at least 20
units. It was an ammunition ship no less but had quite a good technology
compliment. Commissioned in 1973 turned to razor blades in 2015.

Regards
Paul
WB8TSL

On Tue, Jul 11, 2017 at 12:59 PM, David Wise <David_Wise at phoenix.com> wrote:

> The synthesizer boards (A12, A13, and A17) contain loops that phase-lock
> to the frequency standard module.
> They do not feed back to it, why would they?  It's the reference for them,
> not the other way around.
>
> Regards,
> Dave Wise
> ________________________________________
> From: r-1051-bounces at mailman.qth.net <r-1051-bounces at mailman.qth.net> on
> behalf of paul swed <paulswedb at gmail.com>
> Sent: Tuesday, July 11, 2017 6:11 AM
> To: R-1051 Discussion Group
> Subject: Re: [R-1051] R-1051G manual on line
>
> [snip]
>
> I did note the G version main oscillator uses a phase lock loop. Unclear
> how that actually works as there was not a feed back to the oscillator. So
> I suspect its actually just an auto sense internal/external circuit for the
> 5 MHz.
> Regards
> Paul.
> WB8TSL
>
>
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