[Collins] 851-S1 stability

[Dr. Gerald N. Johnson]

I've been digging for the manual and the only thing I came up with was 
at mods.dk and the package didn't include the specifications or the 
operator's manual.

So I was going to say that it takes a really good TCXO to hold 1 x 10-9 
and I found in that manual set that the crystal oscillator is the 
reference so I wouldn't expect it to be that good for drift. It is shop 
adjustable for temperature compensation. I have an HP standard that 
might do 1 x 10-11 with lots of temperature control and an SC cut 
crystal, model 10811. Better than that takes rubidium that's only 
another order of magnitude better. 3 x 10-18 is a million times better 
than can be purchased today.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 9/23/2016 10:59 AM, Heinz Breuer wrote:
> Hello Sheldon,
> this is a misprint.
> The -10 Series Supplement, 851S-1 Receiver, 2nd Edition, March 1, 1981 says 3 x 10-8 per week with the standard oscillator or 1 x 10-8 per week with the optional high stability oscillator.
>
> vy 73 Heinz DH2FA, KM5VT
>
> Von meinem iPhone gesendet
>
>> Am 23.09.2016 um 16:18 schrieb Sheldon Daitch<SDAITCH at bbg.gov>:
>>
>> Because of Heinz' posting of his 851-S1, I looked at this link:
>>
>> http://www.collinsradio.org/cca-collins-historical-archives/the-equipment-of-collins-radio/the-s-word-or-solid-state/851s-1/
>>
>> to refresh my memory on this unit and noted this specification under frequency stability:
>>
>> Drift rate not more than 3 x 10-18 per week.
>>
>> Ten to the minus 18?  That can't be right, can it?
>>
>>
>> 73
>>
>> Sheldon
>>
>> [http://www.collinsradio.org/wp-content/uploads/2012/08/851S1ax.gif]<http://www.collinsradio.org/cca-collins-historical-archives/the-equipment-of-collins-radio/the-s-word-or-solid-state/851s-1/>
>>
>> 851S-1 | Collinsradio<http://www.collinsradio.org/cca-collins-historical-archives/the-equipment-of-collins-radio/the-s-word-or-solid-state/851s-1/>
>> www.collinsradio.org
>> HOME; ABOUT; JOIN US; ARCHIVES; SIGNAL; RX For Your Collins; REFLECTOR; MEMBER LOGIN; MANUALS; 851S-1. THE COLLINS 851S-1 RECEIVER. The Rockwell-Collins 851S-1 is the ...
>>
>>
>>
>>
>> ________________________________
>> From: Collins<collins-bounces at mailman.qth.net>  on behalf of Heinz Breuer<hbreuer at debitel.net>
>> Sent: Wednesday, September 21, 2016 5:58 AM
>> To: collins at mailman.qth.net
>> Subject: [Collins] For sale Rockwell-Collins 851S-1 receiver
>>
>> Hello,
>> out of my personal collection I have available for sale a Rockwell-Collins 851S-1 Receiver.
>>
>> The 851S-1 has 7 Collins mechanical filters and offers bandwidths 0.2 kHz, 0.5 kHz, 1 kHz, 3 kHz, 6 kHz, LSB and USB as well as 16 kHz due to the roofing filter. The receiver has modes SSB, CW, AM.
>> Tuning step is 10 Hz.
>>
>> There are no optional boards installed: No IF Channel B, no VBFO, no AFC, no Parallel IN, no Parallel OUT, no Serial card and no high stability oscillator.
>> I do have a couple optional boards these can be purchased at additional cost.
>>
>> Pictures are available on request.
>>
>> Overall condition is very good to excellent, no marks on the front panel, a few smaller scratches on the top and bottom cover due to rack mounting. The VFO knob insert has a couple light scratches and small marks.
>>
>> The 851S-1 is in fully working condition.
>>
>> Price is $ 1.200
>>
>> I will ship worldwide with DHL Express as fully insured parcel. I will pack very carefully in a strong triple wall export box (10mm wall thickness) with styrofoam cushioning.
>>
>> Please ask for shipping charges to your destination. As a hint expect about $ 220 shipping to the US.
>>
>> vy 73 de Heinz DH2FA, KM5VT
>>
>> Von meinem iPhone gesendet
>>
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