Home Top Page 1



10, 5, 1 MHz Disciplined

Precision Quartz Standard



A1= 500khz output
A2= 500khz output
A3= 1 MHZ output
A4= 5Mhz input ( not needed except when the module is switched to the compare mode via an external 10-9th standard AN/URQ10 series)
A5= 10Mhz output
A6= 5 mhz output (the real reason for this module)

P1= +20vdc
P2= Ground
P3= +28vdc
P4,5,6,7 spares, not used

Yes, there was 2 500 khz outputs-- they went to different modules.

Keep an eye on this listing.  We are going to try to characterize the standard and display the Allan Variance.

This standard was rated at 1 part in 10-8th per day. It was normally not used internally with this unit but had an external 5mhz standard which was used most of the time which was the 10-9th a factor of 10 better than the internal standard.

This was the mainstay of the navy, the R-1051B and the air force had the C model. Unbelievably complicated and weighs 90 lbs for a solid state unit. However, they are still in use today! (G&H models) today because they are so rock solid when it comes to SSB reception.

The 5mhz input compared the frequency to the internal standard and there was a flashing neon bulb and the ET's tried to get the internal standard to almost agree with the external standard at something like 1 flash/ 5 seconds.

This unit has been factory refurbished and it comes in a sealed anti-stat bag from the Navy's Metrology Lab. 

Its Military Part Number is AG-6625-078-4713



This item is sold with a 3 Day Satisfaction Guarantee.  So bid with confidence.  As our many customers will attest, we will do our very best to resolve any customer problems. But our official policy is:

This item comes with a 3 day right of return policy.
All returns must be made within 3 days of receipt.
All warranties are void if the calibration / warranty seals are broken.
Equipment must be shipped correctly and returned with all accessories.
Customer is responsible for all shipping charges on returns.
Foreign Buyers please be aware: We offer no warranty or returns on items shipped outside the USA

Payment, Shipping & Bidding:

Buyer will pay $10.00 packing and shipping in the continental United States. Payments accepted are Paypal, cashiers checks and money orders only.  No international buyers unless Paypal verified.  Please feel free to contact us if you need other arrangements.

We will make every effort to ship within 24 hours of receipt of payment. We ship with FedEx & UPS only. We will be glad to ship with other carriers using the purchasers shipping account. Please contact us to make any special shipping arrangements. For shipping rate research, our shipping address is Boulder, CO USA ---- Zip Code is 80305.

Many of our auctions have a set packaging and shipping fee.  This set fee makes the transaction easier and allows the purchaser to send payment at once without having to wait for a shipping total.  This is our best guess on an unpackaged item.  Please consider the total with shipping when you are bidding.

Foreign buyers: Unless special provisions have been made, you are responsible for making your own shipping arrangements and all costs related to customs, duties & special packaging requirements. Please do not ask us to quote you international shipping rates. Use the address information above to research you own shipping rates. You can email sales@ascentconcepts (no spam) .com to get the packaging fee, package weight and size for your research. Items sold outside the USA are sold as is.

Bidders - with no feedback or less then 80% positive feedback must contact us through the eBay email system before placing a bid. We will reply through the same system, documenting that you have been approved to bid. If you do not follow these procedures, your bid will be cancelled.  All other bidders, bid with confidence.


About Us:

Ascent Concepts and Technologies is a Research & Development Lab. As a service to the companies and institutions we work with, we broker their excess equipment & act as application specialists on their new equipment needs. We are now offering quality used equipment to the public with the same level of professionalism and service.

Please feel free to email at thomasknox@ascentconcepts (no spam) .com or call Thomas @ 1-303-554-0307 with any Technical questions. Please feel free to email at waltwhite@ascentconcepts (no spam) .com or call Walt @ 1-720-276-8288 with any Shipping or Logistical questions. We make every effort to evaluate and guarantee our equipment. Although we do not provide NIST traceable calibration, we do have extensive in house calibration equipment and make every effort to test and verify performance on equipment we sell. However we do not warranty any items shipped outside the USA.



The equipment shown is a representation only.  We often have multiple units in stock so please email us with your needs.  We have a large inventory and can usually find any test and measurement item in a short time frame.------Inquires