Lee,
The reason for the diode is to keep the source voltage from the amplifier
and the transceiver isolated from each other in case one is greater than the
other.
Terry W6RU
----- Original Message -----
From: "WA3FIY" <wa3fiy@radioadv.com>
To: "Greg Hodsdon" <k7kj@arrl.net>; <tentec@contesting.com>
Sent: Friday, March 28, 2003 5:08 PM
Subject: Re: [TenTec] Orion with AL-1200 -- QSK
> That procedure at Alpha looks good to me. I've been using the AL-
> 80A with PIN T/R for over 10 years now with the Corsair, Paragon,
> Pegasus and Jupiter. That's exactly how I do it on all the rigs except
> Corsair. It does not have the keying loop. I do not use the diode
> though and see no need for it. The Ten Tec can easily handle the
> 12 volts or so at a few mA the PIN switch requires. The QSK on this
> setup is text book perfect.
>
> Might be a good idea to get a spare pilot light fuse if they still use
> those. Once in a blue moon, I key up the rig without having the
> amplifier QSK cable plugged in but having the "OPR" switch on. So,
> I'm putting 50 to 60 watts into the receive PIN diodes. Ameritron
> provided for such foolishness on my part by fusing the receive
> diodes. I'm not gonna tell you how many times I've replaced those
> lamps but it's more than once! :-)
>
> 73 de Lee, WA3FIY
>
>
> On 28 Mar 2003 at 15:50, Greg Hodsdon wrote:
>
> > Grant:
> > You might try the Alpha 89 setup as outlined on the
> > Alpha Power website at:
> > http://www.alpha-amps.com/html/tentec.htm
> >
> > Greg Hodsdon
> > Portland, OR
> > k7kj@arrl.net
> > http://www.qsl.net/k7kj
> > ----- Original Message -----
> > From: <nq5t@attbi.com>
> > To: <tentec@contesting.com>
> > Sent: Friday, March 28, 2003 3:04 PM
> > Subject: [TenTec] Orion with AL-1200 -- QSK
> >
> >
> > > I need some help. The Orion manual is not very lucid on QSK
> > > connections. I presume the workings are similar to the Omni, etc.,
> > > but since this is my first T-T radio, I'm not up to speed.
> > >
> > > My AL-1200 has the Pin diode QSK switch (QSK-PC) built in. With
> > > an IC-781, it was only necessary to key the AL-1200 from the radio's
> > > RELAY line. This appeared to meet the timing requirements for the
> > > AL-1200 (e.g. no hot keying of the PIN diode QSK switch).
> > >
> > > Wondering how this is best done from the Orion or other T-T radios,
> > > e.g., is it necessary to use the Keying Loop or just the Relay output?
> > > And if the keying loop is a better option, how it should be connected
> > > to the QSK-PC in the AL-1200?
> > >
> > > Can anyone with experince with T-T and the AL-1200 QSK system
> > > weigh in on this? I'm feeling obtuse today ..
> > >
> > > Thanks ... Grant
>
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