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

[John Kolb]

Most any signal generator that covers the required frequencies
will do for an alignment. To measure the receiver sensitivity
requires a well shielded unit with a good attenuator. The Heathkit
lab grade signal generator need not apply here.

URM-25's were the standard Navy signal generator during the era
of the 390's so are in the offical proceedure, but not required.
They were widely available surplus and cheap so became popular
with the radio hobbyist.

Best generator here is a Logimetrics I picked up at the swap meet
for $20. a few bad spots on the output attenuator, but easy to
use an external attenuator instead.

Anyone interested in a HP-606A for $ 50? Pick up only, near
San Diego.

John



On Tue, 8 Apr 2003 tburr@dixie-net.com wrote:

> 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.
>
>
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