[time-nuts] R&S XSRM Rubidium Standard

KA2WEU at aol.com KA2WEU at aol.com
Tue Sep 12 12:54:15 EDT 2017

To all:
I would highly recommend not to buy used test equipment on e-bay , mine  
(R&S) or HP or similar.
These pieces are mostly out of calibration , defective , just too expensive 
 to repair. I have 3 XSRM systems, which I co designed in 1970, they came 
from  e-bay and needed $ 5000 + to be in shape.
My advise :Hands off.
Ulrich Rohde , N1 UL 
In a message dated 9/12/2017 8:59:06 A.M. Eastern Daylight Time,  
time-nuts at febo.com writes:

A friend  of mine has bought a just out of calibration R  & S XSRM Rubidium 
standard from one of the so called "recyclers" on   Ebay.

Although the price was good, and it came with the off air   receiver, phase 
meter, and frequency divider, it looks to have been  heavily  
with deliberate damage to the internal wiring  and the  rubidium lamp 

We've found the relevant manuals  online and he's confident he can  repair 
the wiring but he still  needs to locate a lamp.

If anyone has a working lamp available, or  might know where one  could be 
obtained, please contact me off  list.

He did comment that the lamp assembly looked as though it might  accept the 
lamp from an Efratom FRK, can anyone confirm  this?
Alternatively, is there likely to be any risk of damage to the   FRK lamp 
to the XSRM lamp driver if he tries it but it's not   compatible?


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