[R-390] Series 500 IF Module

[mdmerz]

Hi, I can’t help you with the schematic you’re looking for.  I assume you’ve seen Marcotte’s Electric Radio article on this conversion which is what I followed when I installed an R390 i.f. in my R390a. I found his article very complete step by step.  The cabling and adapters for connection was the part that took some improvising because of the connectors I found available at the time.
Dan

Sent from my iPad Air4

> On May 27, 2024, at 6:46 AM, Byron Tatum <bjtatum1 at att.net> wrote:
> 
> Hello-    I am considering converting an R-390 IF module to fit into an R-390A mainframe. I have some info on this but have seen posts that a schematic for the actual Servo Corporation Series 500 IF module exists. I have searched for one to no avail.     I was hoping to find this schematic to compare it to the R-390 IF module and aid in the conversion.     Also, I would like to add any R-725 technical info that is available to my files here in order to study.     Will pay any costs incurred if copying is required.Thanks all,Byron W5FH
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