[R-390] Powering PTO's out of circuit

[Paul Anderson]

I went through this with one of mine.  It has been awhile, so I am
fuzzy on the precise details.

However, unlike the R-390 and R-390A PTO's, I think I figured out that
it needed to be in circuit in order to oscillate.  Someone smarter
than I am should be able to confirm this by looking at the circuit
diagram.

The symptom I had was that it would oscillate fine in circuit, but
removing it from the circuit made it not oscillate cleanly (it did
have a waveform, but it was very unclean).

I would like to be able to operate it externally as well (for
alignment and testing)... so if someone has ideas as to how to
accomplish that, I'd be grateful if they shared.

Paul

On Sat, Feb 27, 2010 at 9:55 AM, Norm - WA3KEY <norm at wa3key.com> wrote:
> Has anyone on the list powered an R-392 PTO out of the receiver?  I
> constructed a simple fixture using a Heath IP-17 power supply and
> frequency counter for setting end points and have used it successfully
> with R-390A and R-390 PTOs, but have been unable to get an R-392 PTO
> to run out of circuit.  Perhaps it has something to do with the 26D6
> serving double-duty as an oscillator/mixer.  Attached are the pin-outs
> I'm using on all three.
>
> Thank you.
>
> Norm - WA3KEY
> norm at wa3key.com
>
>
>
>
> R-390 (Non-A)  Range: 3.455-2.455MHz
>
>  A - +180vdc B+
>  B - n/c
>  C - 6.3vac filament
>  D - Filament ground
>  E,F - n/c Oven
>  H - Ground
>
>
>
> R-392  Range: 3.455-2.455MHz
>
>  A,B,C,D - n/c
>  E - +28vdc filament
>  F - +28vdc B+
>  H - Ground
>
>
>
> R-390A  Range: 3.455-2.455MHz
>
>  A - +180vdc B+
>  B - +150vdc Screen
>  C - n/c Spare
>  D,E,J,K - n/c Oven
>  F - Ground
>  H - 6.3vac filament
>
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