Hi, John-
I don't remember S3001 but I assume I might have that
in my 1000D as well. I think the unmarked side has to
be variable transmit power from about 5 to 200 watts,
with the 50w side being a fixed output power level?
Perhaps it is intended as a RTTY setting?
Please be very careful if you decide to utilize the
tx-on control line on the band data connector. It will
indeed control an amp, but the oputput is only a
fragile transistor good for about 100mA, as I recall.
I would strongly recommend you build up an
interface circuit to protect this tiny transistor.
Those who have blown the transistor report that it
is very difficult to get at the component to replace
it. I believe the transistor is part of a 2-transistor
device. Naturally, it is a tiny surface-mount
component. I recommned that this output never
be used in an attempt to directly switch an amp.
73, David K3KY
On 23 Jan 2004 at 14:47, John Nelson wrote:
> Last night I helped a friend fit a couple of Inrad filters to his FT-1000D.
> Looking on the lower main board, I noticed a switch marked 'S3001' that has
> '50W' against one position and nothing against the other. The switch was set
> to the unmarked position. It doesn't seem to be mentioned in the owners'
> manual - anyone know what it does?
>
> I also noticed that the owner was switching his Alpha amp via the 'Tx GND'
> socket and associated relay. I'd have thought it should be possible to use
> pins 2 and 3 on the BAND DATA output to achieve the same end -- is this
> correct?
>
> Finally, I've heard various things about the quality of the tuning upgrader
> sold by International Radio. Any opinions one way or the other?
>
> 73 John
> GW4FRX
>
>
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