[Elecraft] KPA100 Elimination?

[Don Wilhelm]

Fred,

It sounds like you are a good candidate for a KPA100 in an EC2 enclosure.
If you also add the KAT100-2, the KPA100 plugs into the KAT100 board.
Without the KAT100, you have to make a hole in the EC2 rear panel for a coax
connector (KPA100 input) and make up a cable from the base K2 AUX I/O DE9 to
the KPA100 AUX I/O DE9.  Not difficult at all.  It does require the KIO2 (or
a substitute) in the base K2 - only 4 internal K2 signals are connected, no
RS-232 signalling is involved on the path.

A tenfold increase in power is 10 dB - dB=10log(P2/P1).

73,
Don W3FPR

> -----Original Message-----
>
> My original inquiry concerned my options, with a
> new K2 build - for adding some more power later down
> the pike.  I've always liked separate items; xcvr,
> tuner, metering, and amplifiers.  In some way - the
> way I upgrade frequently - its easier with all the
> pieces, for me to swap/sell out a single item
> easier.  And I'm just not nuts about adding a KPA100
> on top cover of my neat little QRP K2 rig.  I'd guess
> I want to give the K2 all the chance I can, with
> having as little RF interaction with a large pcb
> amplifier sitting 2" above the K2 plane.  Having had
> done hundreds, no thousands, of CAD runs on analog
> circuits in my previous life - there are such things
> as R/L/C/S/F interactions and optimums.  Perhaps
> the K2's digital makeup - helps this.
>
> I really don't understand all that is involved in
> moving a KPA100 outside to a separate box.  Looks like
> my options are to build that new K2, and wait out the
> vendors - impacted by the latest FCC rulings.  I
> understand there is a DB increase limit, over what the
> base K2 outputs.  Perhaps that will limit my external
> choices.  Does anyone know the DB
> increase, from 10W PEP to 100W PEP?
>
> What is driving me is the chance, in the future, to
> be able to swap out any item in the
> xcvr/tuner/amp/antenna string.  Affordably, or with
> alternative backup items.
>
> Thanks,
> Fred N3CSY
>
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