[R-390] Suggested Test Equipment for R-390A Alignment ??

[Scott, Barry (Clyde B)]

Terry,

Welcome.  While the AN/URM-25 is supposed the instrument of choice, it isn't required.  A stable signal source with sufficient attenuation that can be matched to the various test points are all that is needed.  The test procedures frequently mention the accessories that are part of the AN/URM-25's list of accessories, but they are not absolutely necessary.

I used an AN/TRM-1 to align my first R390A.  I've since acquired a nicer GeneralRadio that I prefer and I plan to sell the AN/TRM-1.  Some guy had a large inventory of AN/URM-25 generators a while back.  Perhaps he still has some.

Ask any question(s) you want.  The guys on this list stand ready to help!

Barry(III) - N4BUQ


Can anyone suggest/recommend a good basic list of "test" equipment to
check the operation of the R-390A.  Is the AN/URM-25 absolutely a must -
or can anyone recommend a specific substitute type signal generator ?  I
have 2 R-390A's in storage that were operational years ago, and want to
get them out put them to use ("If my back does not give out on me").  I
plan to be asking a lot of "stupid" questions in the future, so please do
not be too harsh on me.  I am not a tech, but I am sincerely interested in
learning about the R-390A.

Terry.