[R-390] Signal Generator Impedence Questions

[William A Kulze]

>
> ----------------------------------------------
> The IF alignment procedures for the R390A state to connect the URM-25* to
> the input connector using an impedance matching adapter  (either Test
> MX-1487/URM-25D or CU-206/URM-25F depending on which generator you have).
> Assuming the URM-25* is 50-ohm output, what does this converter do?
>
>>From Para 73 page 114. of the R390/A TM 11-5820-358-35 Dec 8 1961 copy.
> Fellows, does someone have the AN/URM 25 TM and tell us exactly
> what is in these two Adapters? Thanks Roger KC6TRU
> -------------------------------------------------------------------------

Rodger,   I have the Army TM for the AN/URM-25F at home. I built one of
the matching networks in there (they might have called it a dummy load),
think it was CU-409, but it's been quite some time, can't be sure without
looking. But it does have schematics for the adapters in there, I'll try
and have a look in the next day or so and make a posting. Maybe someday
I'll scan it into a pdf. Then I just need a place to post it.

Bill