[Milsurplus] URM-25D...

[Kenneth G. Gordon]

I have a really nice URM-25D here which I am using to aid in 
the alignment of the SRR/FRR receivers I am overhauling.

I use it with a nice little frequency counter I got from surplus 
here at the U.of I.

My unit didn't come with all the accessories, so I plan to build 
those which are missing.

I am curious if anyone else here has had to do this and what 
were your results?

Also, is the attenuator in the URM-25D fairly accurate? Is the 
unit really RF tight, or only somewhat?

The reason I ask is that when I get down in the sub-microvolt 
region, the signal strength doesn't appear to get weaker 
linearly. I still hear signal at what the URM-25D says is less 
than 0.1 microvolt and that seems truly amazing to me.

Ken Gordon W7EKB