[R-390] PTO

[Roy Morgan]

At 05:06 PM 12/5/2005, Richard Loken wrote:
>On Mon, 5 Dec 2005, David C. Hallam wrote:
>
> > According to the information I have, the only differences are the RF
> > connector and the power cable.  I think the power connector itself is the
> > same.


Do be careful here.

Radio           PTO
R-390/URR:  70H-2
R-390A/URR: 70H-12

  The power plugs may be quite different: one having a different number of 
contacts than the other one, even though they are both the small hex shaped 
Winchester type.

It's not clear to me but the B+ supply to the PTO may be thought the output 
coax in the R-390/URR PTO (70H-2).  The output voltage may be specified as 
different, but likely would work ok.

The frequency span, plate voltage, heater voltage and current, filament 
voltage and number of turns are the same.

I can't say about the physical size  and mounting point dimensions.

Any one with a 70H-1 PTO: It will *not* work in either of these radios, 
send it to me.

Roy


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
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