[Elecraft] 2 meter Linear and ALC with K3

[G4GNX]

Thanks Don.

The amp ALC line uses an audio oscillator and diode to generate the negative 
voltage, so I can leave it out or add an extra gate for 5V or GND.

73,

Alan. G4GNX

-----Original Message----- 
From: Don Wilhelm
Sent: Sunday, March 4, 2018 9:34 PM
To: G4GNX ; elecraft at mailman.qth.net
Subject: Re: [Elecraft] 2 meter Linear and ALC with K3

Alan,

I would strongly recommend you use the Transmit Inhibit in the ACC
connector instead (pin 7).  See page 21 of the K3S manual and page 66
for the menu (note it is a Tech mode entry).

If you do not have a contact to either ground or +5v in that amplifier,
You may have to devise an intervening circuit to provide either ground
or +5v to ACC pin 7.  You should not apply a negative voltage to that pin.

73,
Don W3FPR

On 3/4/2018 4:04 PM, G4GNX wrote:
> I'm about to build a linear amplifier for 2 meters and the design I've 
> chosen sends a negative voltage to the driving rig's ALC line to inhibit 
> RF input, whilst the linear goes through a TX sequence.
>
> In view of the way that ALC is used differently with the K3S and KPA500, 
> does the use of ALC in this way seem feasible for use with the K144XV 
> transverter?
>