Hi Snowy -
Are you using the matching model 225 power supply? I had an Argosy II back
around 1993 - bought it used at HRO in Salem NH - and I vaguely recall that
when it had some kind of issue I called (didn't "reach out to" ha) Ten-Tec
and they suggested the problem was with the supply, even though the radio
still powered on. I (somewhat) remember thinking there's no way the power
supply could be the problem, but trusted their judgement. They sent what I
think was some kind of driver transistor(s) for the supply, and it fixed
the problem. Ten-Tec also warned me the parts they sent were no longer
available, outside of whatever leftover stock they sent me.
If you're running the matching supply, are you able to test the rig on
another ~12 VDC power supply?
If you go that route, and you don't have an inline breaker, try to transmit
into a 50 ohm dummy load, as some of the old Ten-Tecs can be fragile when
running on something other than their factory matching power supplies.
73
Andrew NV1B
..
On Sat, May 14, 2022 at 3:01 PM ROLAND HOWELL via TenTec <
tentec@contesting.com> wrote:
>
> Hi all, i hope i have not sent this request for advice twice but here
> goes (again).
>
> I have the above radio, the fault is no rf out either in the 5 or 50
> watt setting.
>
> There appears to be no output on connector 39 on the exciter board, i
> have checked all voltages on U1, and all the trannies, all appear to be
> within spec, just a few millivolts out.
>
> There is no increase in current rate when changing from RX to TX,
> voltages appear to be ok on the finals board.
>
> What is U2 , a quad uhf modulator barrier diode array, that is the only
> item that i am unable to test, is there a suitable replacement?.
>
> thanks in advance
>
> 73
>
> Snowy G0HZE
>
>
> _______________________________________________
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> TenTec@contesting.com
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>
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