[R-390] Alignment

Sun, 09 Mar 2003 17:05:13 -0500

Gord, I feed my r-390a using the balanced input and tv ribbon. I adjusted 
the balancing trimmers this way: I put the main dial to the center frequency 
of the respective rf coil. I put two matched 150 ohm resistors in series 
across the balanced antenna input. I attached a signal generator to the 
center of the two resistors and ground. I injected a weak signal and 
adjusted the balance trimmer for a dip (null)on the carrier meter. It was 
quite sharp. Do this for every rf coil and also peak that coil (the other 
adjustment)by grounding one side of the balanced input and feeding a weak 
signal to the other side. Be sure the front panel antenna trim control is 
near zero and/or the two red dots on the gears are aligned.
.....Steve...KJ8L

>From: Gord Hayward <[email protected]>
>To: [email protected]
>Subject: [R-390] Alignment
>Date: Thu, 06 Mar 2003 10:19:07 -0500
>
>Hello all.  I recently acquired an R-390A.  I have replaced all the 
>elecrtrolytics and recapped the AGC and AF areas.
>Z503 was open so I replaced it (wice after learning a valuable lesson about 
>Q) and I have gone once through the
>alignment.  It sounds pretty good and the response seems to be at 
>specification.  Question:  the manuals don't seem
>to say anything about setting the crystal oscillator plate coils T401 and 
>T207 nor aboutsetting the RF amp input
>coils from the balanced input.  Can anyone shed some light on this for me?
>
>Thanks much es 73 de Gord, VE3EOS.
>
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