kb8tq at n1k.org
Fri Nov 21 19:21:58 EST 2014
I believe that the SR620 uses a “true” 10 MHz OCXO. I would be careful using a 5 MHz doubled to 10 OCXO. The counter may or may not be happy with sub-harmonic induced jitter.
Best bet at the specs:
Sine wave out +7dbm
+/- 5x10^-9 0 to 70C
Pinout - trace what you have.
> On Nov 21, 2014, at 6:59 PM, Don Latham <djl at montana.com> wrote:
> So, I got a reasonable deal on a SR620 ho ho. Know your dealer. The ocxo is
> out of tolerance. All self tests pass with flying colors, autocal works as
> well. So the best parts are OK.
> Does anyone:
> 1) have a spare Isotemp OCXO36-53 10.000 MHz p/n 6-00051?
> 2) know the specs, ie the input voltage/current and the control voltage span
> and direction? pinout?
> I have some Morion mv-89's and could easily cobble one in if it will work.
> Apparently a correct oscillator must be in place to use an external source, if
> I read the manual right.
> 3) do we have a source for the schematics for the SR 620?
> The FTS 4060 is up, pumpin' and firmly locked. At least for now. That dealer
> was not lyin'
> Much thanks to all of you.
> The adventure continues
> "The power of accurate observation is commonly called cynicism by those who
> have not got it."
> -George Bernard Shaw
> Dr. Don Latham AJ7LL
> Six Mile Systems LLC
> 17850 Six Mile Road
> Huson, MT, 59846
> mail: POBox 404
> Frenchtown MT 59834-0404
> VOX 406-626-4304
> Skype: buffler2
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