K1/K2 question

[Ken Kopp-3]

I have an off-reflector friend who's just built a K1.  He asks
if it can be mated with a KPA-100, perhaps in an EC-2?
Off hand, I'd say there are ... at least ... antenna relaying
issues involved.

He realizes that if this is possible he might not achieve the
full 100W output from the KPA-100.

73! Ken Kopp - K0PP
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or
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[Don Wilhelm-4]

Ken,

Not possible.  The KPA100 must communicate with the base K2 for band
selection, power control, T/R switching, and other functions.  The K1
does not have the necessary signals to communicate with the KPA100.
The KPA100 was designed as an integral part of the K2 rather than 'just
an amplifier'.

With a *lot* of modification, the KPA100 could be made to work
standalone, but the amount of modification is so great that it would not
be cost effective (and IMHO the result would be a kludge).

A higher power linear amplifier could be used with the K1.  If the amp
is truly linear and develops 1000 watts with 100 watts of drive, it will
also develop 100 watts of drive with 10 watts input or 50 watts with 5
watts input.

73,
Don W3FPR

Ken Kopp wrote:
> I have an off-reflector friend who's just built a K1.  He asks if it
> can be mated with a KPA-100, perhaps in an EC-2?
> Off hand, I'd say there are ... at least ... antenna relaying
> issues involved.
>
> He realizes that if this is possible he might not achieve the
> full 100W output from the KPA-100.
>
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[Terry Myers]

Look at some of the amplifiers from Tokyo High Power.  They have several
that will do a fine job.  They are high quality and price now.  Yes they can
be imported on a personal basis.

Terry KQ5U

----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: "Ken Kopp" <[hidden email]>
Cc: <[hidden email]>
Sent: Saturday, November 15, 2008 3:25 PM
Subject: Re: [Elecraft] K1/K2 question

> Ken,
>
> Not possible.  The KPA100 must communicate with the base K2 for band
> selection, power control, T/R switching, and other functions.  The K1 does
> not have the necessary signals to communicate with the KPA100.
> The KPA100 was designed as an integral part of the K2 rather than 'just an
> amplifier'.
>
> With a *lot* of modification, the KPA100 could be made to work standalone,
> but the amount of modification is so great that it would not be cost
> effective (and IMHO the result would be a kludge).
>
> A higher power linear amplifier could be used with the K1.  If the amp is
> truly linear and develops 1000 watts with 100 watts of drive, it will also
> develop 100 watts of drive with 10 watts input or 50 watts with 5 watts
> input.
>
> 73,
> Don W3FPR
>
> Ken Kopp wrote:
>> I have an off-reflector friend who's just built a K1.  He asks if it can
>> be mated with a KPA-100, perhaps in an EC-2?
>> Off hand, I'd say there are ... at least ... antenna relaying
>> issues involved.
>>
>> He realizes that if this is possible he might not achieve the
>> full 100W output from the KPA-100.
>>
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[Ken Kopp-3]

My thanks to all who responded to my question about
adapting a KPA-100 to a K1.

Your replies have been forwarded to my friend.

73! Ken Kopp - K0PP
     [hidden email]

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[John Shadle]

You might have your friend check out the HF SuperPacker Pro. I think
Virgil K5OOR is going to be doing a run of these in January.

http://www.hfprojectsyahoo.com/hfsupro100wa.html

100w on 160m to 10m. (Probably more than 100w, given the circuit--but
he's just guaranteeing 100w on all bands.)

He also has the HF Packer Amp, which is a 35w model.

-john W4PAH
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[Chris Kantarjiev K6DBG]

> You might have your friend check out the HF SuperPacker Pro. I think
> Virgil K5OOR is going to be doing a run of these in January.

I think Virgil's doing a great job bringing these projects and kits out,
but ... I enjoyed building a HFPacker amp, but didn't keep it long.
I found that it was *very* sensitive to taking too much input,
also to a mismatched antenna. I blew the MOSFETs in the first week
of (what I thought was) gentle use. I replaced them, made sure it
all worked, and sold it. I bought a KPA100 instead, and never
looked back. If you've got a K2, you just can't beat the integration.

73 de chris K6DBG
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