[Elecraft] K3: RE: OT Expert 1k Amplifier

[Enno J. Korma, PF5X]

OK, that may come in handy.

Made a stupid mistake in my ALC comments though. It is the linear which
generates the negative ALC voltage (0 ~ -5V) and not the other way around as
I described. The K3 is set-up to receive a positive ALC voltage, which need
some external circuitry to adapt for a neg. ALC.

Oh, and do not panic about my stated delivery time. It is on MY request and
not because Elecraft cannot deliver earlier.

 
Regards,
 
Enno Korma, PF5X
 
-----Original Message-----
From: Doug Faunt N6TQS +1-510-655-8604
Subject: Re: [Elecraft] K3: RE: OT Expert 1k Amplifier

   From: "Enno J. Korma, PF5X"
   Date: Thu, 22 Nov 2007 20:40:30 -0000

   ALC interfacing is recommended with this kind of linear. I have already
   asked on this reflector how this should be done with the K3. The K3
delivers
   a positive
   ALC voltage whereas the linear - like other types - needs a negative
   voltage. Wayne had replied that this needs a little external circuitry
   which will be described in due time. (Looking to the schematics I believe
   the K3 does not carry any negative voltage line at all).

Take a look at the io board- there's a negative voltage generator there that
drives the RS232 level converter.  Page 9 of the downloadable schematics,
KIO3 Main, sheet 2.  

It's not really our Elecraft until we've modified it ourselves.

73, doug

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