[TowerTalk] Repairing Yaesu G-800SA

[Terrence R. Redding Ph.D.]

Okay Perry.

I ordered one.  It should be here in the next few days.  I am getting ready
to run phone patch traffic for the SATERN net and 14.300 and need to be able
to turn the tower.  Normally from here in West Palm Beach, Florida pointing
the beam across the continent works just fine.  But if I want to run
patches, it is better to turn the house around.

Once the replacement is here I will start working to repair one of the two
broken controllers.  Lightning as you might imagine is a problem here.

Terry - W6LMJ


On 1/19/10 5:10 AM, "towertalk-request at contesting.com"
<towertalk-request at contesting.com> wrote:

> Message: 1
> Date: Mon, 18 Jan 2010 19:58:00 -0600
> From: "Perry - K4PWO" <k4pwo at comcast.net>
> Subject: Re: [TowerTalk] TowerTalk Digest, Repairing Yaesu G-800SA
> To: "Tower and HF antenna construction topics."
> <towertalk at contesting.com>
> Message-ID: <281F9ABCA5C5431C8791F043D1A46E26 at Developement>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
> 
> I'm thinking of getting one as well
> The manual is on the Yaesu Web site and it has a controller schematic in the
> back (I can e-mail the PDF file if you don't find it).  Pretty straight
> forward circuit.  You have a DC power supply that produces a regulated 12
> volts for the electronics, and un-regulated 24 volts for the rotor.  The
> electronics mainly read the feedback pot's voltage in the rotor to drive the
> display compass rose motor and it's mechanically coupled feedback pot to the
> same voltage.  The equivalent of a "selsyn" system.  The rotation direction
> switches just cause the relays to close reversing the polarity of voltage to
> the motor depending on the direction of rotation.  You have an internal 3
> amp. fuse in the 24 volt supply as well as the AC line fuse on the back of
> the controller.
> 
> 73 de Perry - K4PWO