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Reply-To: <la3za at qsl.net>
From: "Sverre Holm - LA3ZA" <la3za at qsl.net>
To: "'TL'" <ernie at netvision.net.il>,
        "'Elecraft Reflector'" <elecraft at mailman.qth.net>
Subject: RE: [Elecraft] IF outputs from the K2
Date: Wed, 4 Dec 2002 22:24:22 +0100

The latest version of my modifications page has a section on I/O to/from
the K2, see http://www.qsl.net/la3za/K2/mod.html and go to General
modifications. You'll find a section of I/O that has:

- balun inside K2
- IF output
- AF output independent of AF control
- High level SSB input

If there are more I/O mods out there, then let me know!

73
Sverre LA3ZA

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From: "George, W5YR" <w5yr at att.net>
To: "TL" <ernie at netvision.net.il>,
        "Elecraft Reflector" <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] IF outputs from the K2
Date: Wed, 4 Dec 2002 20:25:54 -0600

Issac, I am probably the "someone" you recall. I have modified my K2
to bring out two separate IF signals to input to my Icom IC-756 PRO2.
One output does not use the K2 IF filter, so that compromises the K2
front end performance. It does however, allow the PRO Spectrum Scope
to operate, etc. The other output comes from the AGC mixer/amplifier
and is a much narrower, higher dynamic-range signal than the first
output.

Either output plugs into the Receive Antenna port on the PRO. The PRO
must be tuned to the appropriate frequencies, depending upon which
output is being used and which band the K2 is using. These frequencies
are not the obvious nominal IF frequencies of the K2. Explaining the
procedure for setting all this up on the second receiver is not
trivial, and it is the time required to do that properly that has held
up my preparation of a tech note for the Elecraft website.

After I have done some more work with this down-converter mode of
operation, I will prepare a detailed account of the modification and
the results I have obtained.

Let me close, however, by noting that this down-converter operation is
NOT NECESSARY at all for good performance from the K2. I tried it out
just as an experiment, thinking that there might be some merit in
combining the award-winning front-end performance of the K2 with the
IF-DSP capabilities of the PRO. Thus far, I have found that the
arrangement does work and work well, but the jury is still out with me
as to whether or not the results are worth the effort.

More later - promise!   <:}

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
In the 57th year and it just keeps getting better!
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
K2 #489      Icom IC-765 #2349     Icom IC-756 PRO  #2121



----- Original Message -----
From: "TL" <ernie at netvision.net.il>
To: "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Wednesday, December 04, 2002 10:32 AM
Subject: [Elecraft] IF outputs from the K2


> Hello Elecrafters
> I recall sometime ago someone mentioned doing that.
> Can anyone point me where to?
> Tks in advance, 73 Isaac, 4Z4TL

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