[Drake] T-4XB Transmitter problem

[ed brooks]

Regarding no output with plate current looking normal.  Yes, almost 
certainly the TR relay.  Just worked on mine for exactly the same reason.

As to no TX with RX VFO.  Several possibilities.  First is the cable. 
 Does the RX work with the TX VFO?  If not, suspect the cable.

Also likely, as you note, the VFO selection switch.  

Since you have noted some other problems with the receiver, possible 
alignment problems, though the fact it was working until recently 
suggests switch or cable.

Good luck
Ed, W5HTW


Paul S. Serio wrote:

> Recently acquired a Drake R-4A, T-4XB, AC-4/MS-4 combo.
> Receiver works for the most part. Nothing on 160 meters but I
> figure that's a crystal problem. A little hum but that's most likely
> curable with a capacitor change. The transmitter makes power
> (125 watts) but only from the transmitter VFO. In the receiver
> VFO position nothing. Could be the transceive switch I guess but
> it was working recently. The transmitter takes spells at NOT
> making power though the plate current still looks and tunes
> normally. T/R relay maybe? Any help would be greatly appreciated.
> Paul, N5PS
>
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