[R-390] URM-25 replacement

[Jack Antonio]

Hi all

Bob's post reminded of something I saw in my URM-25s.

The URM-25 generator uses a switched series of resistors in
its output attenuator, the last being a 50 ohm-ish  to ground.
(It's not 50 ohm but either 49.9 or 50.1 or something like
that, can't remember which).

In both of the URM-25s I have owned, that 50 ohm resistor was open.
Unless you actually measured the output of the generator, you
probably wouldn't notice the problem.

Then, a couple of years ago, Fair was selling the attenuator
assembly as a separate part, and I bought one. Guess what?
That resistor in that was open as well.

Another thing to check on your URM-25s

Jack

Jack Antonio WA7DIA
scr287 at sbcglobal.net

> If you have a generator that uses a "stacked attenuator" rather than the 
> old sliding coax attenuator it's a good idea to check the attenuator.