[Collins] 851-S1 stability

[Ludwig Combrinck]

Drift rate not more than 3 x 10-18 per week

no, it is not right, that will put you into the arena of chronometric geodesy, and even today there are only a very small number of frequency standards (lab unit and nothing on the market) that gets close to this

73
Ludwig
ZS6WLC

Prof LUDWIG COMBRINCK
Acting Managing Director
HartRAO
PO Box 443, Krugersdorp, 1740, South Africa
eMail : ludwig at hartrao.ac.za <mailto:ludwig at hartrao.ac.za>
http://geodesy.hartrao.ac.za
Tel +27 (0) 12 301 3224
RECEPTION: 012 301 3100
FAX: 012 301 3300

On 2016/09/23 04:18 PM, Sheldon Daitch wrote:
> 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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