I don't have a 781 or 765, but I'm guessing it's similar to my 756proII:
There is no need to switch the voltage on the accessory plug unless you want
to also use the rig on HF. In other words, if you're dedicating the rig for
use with a transverter then leave it connected to +12V all the time. If
not, you'll have to switch the voltage off or disconnect the plug.
When activated, the transverter jack on the rig is bi-directional (use it
for transmit and receive) and the other antenna connectors are disabled.
The only other connection you need is PTT out from the rig to the XV50. I
think the Icom PTT line goes to ground when transmitting. I don't have my
documentation in front of me so feel free to ask more questions if you need
help figuring that out. I'm also not able to verify the pin numbers you
stated to enable the transverter. The XV50 won't handle full break-in QSK
CW so set your rig accordingly.
If you're using a sequencer, there are other modifications you can make (I
added a transmit enable line to my XV144 so I can't blow my mast-mounted
preamp).
73, Russell KB8U
P.S. watch the numbering of the DIN plug pins, I think they don't increment
clockwise or counterclockwise but jump around!
>Date: Sat, 18 Mar 2006 16:13:49 -0500
>From: "Dave Zeph" <zephd@indy.rr.com>
>Subject: [VHFcontesting] Using the Elecraft XV-50 with IC-781 / 765
>To: <vhfcontesting@contesting.com>
>Message-ID:
> <200603182113.k2ILDnK1028453@ms-smtp-02-eri0.ohiordc.rr.com>
>Content-Type: text/plain; charset="iso-2022-jp"
>
>Does any one have experience using the Elecraft XV-50 with an IC-781 or
>IC-765??
>
>Unfortunately there is very little in the Icom Manual on its ?TRANSVERTER?
>Port, or on its use with Transverters.
>
>Can anyone supply me with a Diagram (or Description) of the required
>connections??
>
>My main two concerns are:
>
>1) It appears that the ACC2 Pin-6 must be connected to +12VDC in order
> to activate the Transverter Jack.
> a) Is this correct?
> b) Does the +12 on this Pin have to be SWITCHED for any other
> reason than to activate the Transverter jack?
>.
>2) Is the TRANSVERTER Jack BIDIRECTIONAL - meaning is it used for BOTH
> Transmit and Receive???
>
>3) Or does the TRANSVERTER Jack feed the Input of the Transverter, and
> the Transverter feed receive RF back to the IC-781 / 765?s Primary
> Antenna Input???
>
>
>
>Thanks and 73 -? Dave, W9ZRX
>
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