Guys, BE VERY CAREFUL about bringing the T-line out of the rig.
SPECIFICALLY, DO NOT DO THAT!
This is a signal which runs through many stages of the radio.
If anything unusual externally touches that line, lots of damage can occur.
You MUST buffer the line with a transistor before bringing it out.
Then the worst thing you will do is blow that transistor.
Examples of what might happen:
<> It gets inadvertently connected to an older amp which uses 120v for
keying its relay. "GAME OVER"
<> It gets inadvertently connected to a newer amp which uses 12v for keying
its relay. "Smoked Silicon"
<> It shorts to ground. "If you're lucky, it just blows a fuse. Murphy?"
*** Buffer the signal before you bring it out of the rig! ***
73
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mark N8COO
Sent: Thursday, August 08, 2013 12:48 AM
To: tentec@contesting.com
Subject: Re: [TenTec] Argo V amp keying
>
> Message: 12
> Date: Tue, 06 Aug 2013 08:06:53 -0400
> From: Dave Edwards <kd2e@comcast.net>
> To: tentec@contesting.com
> Subject: Re: [TenTec] Argo V amp keying
> Message-ID: <5200E6DD.20002@comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Is that not the line already available on the accessory connector?
> (for keying the radio)
>
> ...Dave
>
Hi Dave,
Sorry I did not specifically answer your original question. Please allow me
to try again:
The PTT you mentioned earlier (on AUX 1) is to be able to place the rig into
transmit mode, when grounded - like for a transmit foot switch, or a
typical soundcard interface that utilizes hard keying of the rig such as
through the computer's serial port. The manual calls it "keyline input"
(page 6.) It does not provide closure upon transmit.
As shipped from the factory, the line ("T" line) is not available on the AUX
1 connector, or any of the other connectors, nor is there a factory
installed provision for keying of an external amp through relay closure or
other means on the Argonaut V.
The replies given for addition to your rig of a keying circuit for your amp
will do the job, but will involve some modification of the rig. You might
want to bring the "T" line out though the slot for the fan wires or
somewhere similar and mount the keying circuit externally, thus making it
easily reversible and no drilling any holes - if that is a concern.
73, Mark N8COO
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