Hi Wyn,
Don is correct. There should be some spare pins in the DE9 which are of no
use. How about rooting a +ve voltage from the cathode of D14 to one of
these share pins? Then you prepare a specific cable solely for the
connection from XV144 to IC781. Same set up can be used with my IC7800.
73
Johnny Siu VR2XMC
From: "Don Wilhelm" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: "Wyn Hughes" <[EMAIL PROTECTED]>, <elecraft@mailman.qth.net>
Subject: RE: [Elecraft] XV144 paired with ICOM
Date: Fri, 20 Oct 2006 09:46:49 -0400
Wyn,
I don't know what the ICOM requires, so you will have to verify their
requirements, but I can say that there is no signal of the type you
describe
as an output from the XV144.
Internally, there are several places where you can pick up 12 volts
whenever
the transverter is powered on - the cathode of D14 seems to me an easy
place
to connect to. You could connect that through a 10l resistor and bring it
out to whatever place is convenient for you.
Since you referred to the DE9 connector on the transverter as "RS232", I
must comment - IT IS NOT!!!
That connector is a 9 pin connector for connecting to the K2. Accidently
connecting RS232 levels to this connector can damage the transverter
(particularly selected pins of the microprocessor on the front panel)
73,
Don W3FPR
> -----Original Message-----
>
> A slightly tangential question. My XV144 is currently on order. I
> am planning to use it once built with my Icom IC-781 as the 28 mhz IF.
>
> The IC-781 requires a 'trigger' voltage of 2-13.8V dc into 10K
> ohm on one of the rear accessory sockets, in order to enable the
> low level transceive port on the rear of the radio. This is, I
> believe, a standard Icom setup, similar on the IC-7800 etc.
>
> After some heavy pouring over of the downloaded copy of the XV144
> literature, I am still not sure whether this voltage is supplied
> by the XV144. There are a number of obvious easy, if less than
> 'neat', workarounds if required, but does anyone know if the
> XV144 can supply a control voltage of that level, 'on' when the
> XV144 is switched on, and 'off' when it is switched off? Eg off
> the RS232 port?
>
> 73
> Wyn, VR2AX
>
>
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