[amsat-bb] Re: G5500 change voltage supply

i8cvs domenico.i8cvs at tin.it
Wed Jun 1 13:13:51 PDT 2011

Hi Bill, NZ5N

I was looking at the schematic diagram

As I suspected the transformer has 4 wires coming off from the
primary windings.

In my opinion the transformer has two identical primary windings
to work in parallel from 100 to 117 volt and in series with 220 volt

For 100 or 117 volt connect terminal 0 with terminal 2 and the terminal
1 to terminal 3 so that both primary windings are in parallel and in phase
after that connect the 117 volt line to terminals 0 and 2

For 220 volt connect terminal 1 to terminal 2 and the 220 volt line to
terminals 0 and 3

73" de

i8CVS Domenico

----- Original Message -----
From: "Bill Dzurilla" <billdz.geo at yahoo.com>
To: <amsat-bb at amsat.org>
Cc: <ea4cyq at amsat.org>
Sent: Wednesday, June 01, 2011 6:53 PM
Subject: [amsat-bb] Re: G5500 change voltage supply

Here is the mod to change Yaesu rotors to 220v:

But perhaps yours has a different transformer if it uses pin 3 for 117v.  In
the mod, pins 0 and 3 are for 220v.

73, Bill NZ5N

> Subject: [amsat-bb] G5500 change voltage supply
> I have purchased a G5500. The control box have a
> 117Vac label in the real
> panel. I opened it and a wire is connected through
> the fuse to the terminal
> number 3 of the KT-30 transformer and the other wire
> through the main switch
> to the terminal number 1 of the KT-30 transformer.
> I am wondering how I should connect it to work with 220Vac
> in Europe.
> Thanks in advance. ea4cyq at amsat.org

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