[R-390] I.F. alignments & BFO

[Bob Camp]

Hi,

I am not totally sure what problem you are asking about. The stuff below
covers more than one problem.

BFO - Here's what I would check - more or less in order:

1) Swap out V506, V505 and V504.

2) There is a shaft attached from the pitch knob to the BFO coil. Sometimes
this shaft comes loose. Make sure that the coil moves when the knob moves.

3) If you tune to a strong signal with the bandwidth set to .1 KC the BFO
should zero beat with the pitch set to 0. If it does not then loosen the
pitch knob and move the shaft until the zero beat is at 0.

First Crystal Oscillator - V207 - Here's what I would check:

1) Check the tuning on T207

2) Open up the crystal oven HR202 and unplug the crystal Y201. Clean the
leads of the crystal and the oven. Clean the socket that the crystal oven
plugs in to. Put the crystal back in the crystal oven. Put the oven back
together. Put them back in the radio.

3) Swap out V207 and V202.

4) Check that FC no 7 has *not* been done on your radio. If it has then
reverse it. In other words make sure that R210 is 56K ohms and *not* 220K
ohms.

5) Check the tuning on T207.

I hope some of that helps.

    Take Care!

        Bob Camp
        KB8TQ



----- Original Message -----
From: "fef" <ik0ire@yahoo.it>
To: <r-390@mailman.qth.net>
Sent: Tuesday, February 18, 2003 6:44 AM
Subject: [R-390] I.F. alignments & BFO


> I.F. alignments
>
> I am systematizing the my R-390a, anybody could give
> me of the counsels in worth to:
>
> 1 I want to replace the valve V207" 6AK5," I desire
> know like make gives that the valve v207e mail under
> the group of tuning.
>
>
> 2) When I insert the BFO order on ON I listen to only
> that the modulation becomes Dark but there is not no
> variation of note acting on the BFO order/ Pich
>
>
> You excuse The trouble, here in ITALY has not found
> people that could Realign l'R-390a.
>
>
> Surely I will ask you other counsels for realign my
> Receiver, you want to excuse me, Yours sincerely
>
> Frank
>
>
>
>
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