[Hammarlund] RF generator for HQ-180

[Jim Wilhite]

There are differences in the 25 series generators and I am not 
familiar with them all.  I have a URM 25F that provides the 
calibrated output, and also a high power output which I use to 
feed my counter for monitoring my frequency while I work.  Some 
of the 25 series do not have this extra output.  I can't tell 
from the picture on Ebay, but I don't think the D series has the 
extra output

This practice loads the output a bit, but the 25F has plenty of 
output to do this and provide the calibrated signal for the 
receiver under test.  I am not sure the 25D has two outputs, but 
if you can find one, the F model is quite handy.

73  Jim
W5JO

Craig Roberts wrote:
> Roy Morgan said: "Seems to me that if you really want a URM-25, that
> price is not bad..."
> 
> I agree with Roy (now THERE"S an endorsement, eh? :-)). I recapped,
> refurbished and calibrated  my own AN/URM-25D about six months ago and
> it represented a surprising amount of work. True, it's no SP-600 or
> SX-42 in terms of recapping tedium, but it's tricky enough in places.
> What the auction seller is asking for his rebuilt units is quite
> reasonable, I think.  I saw one of his 25Ds about a year ago, and the
> workmanship is nice.  And, for boatanchore servicing, the URM-25 is
> ideal.  I use mine with my old Heathkit freq counter but, to tell the
> truth, the analong readout on a well calibrated URM-25 is close enough
> -- literally -- for government work.
> 
> 73,
> 
> Craig
> W3CRR