[Elecraft] KX3 - New 100 watt amp

[Edward R. Cole]

Merv,

Yes, I could use the BAND0-3 lines from the ACC connector on the K3 
to control band changing (filters).  Not that hard to do if the 
relays are rated for the 300w power level.

I think I can sidestep the FCC regs by providing an "assembly 
service" of the established kits from CCI.  Or I could just bundle it 
all as a kit, of course.  I am not considering a complete ground-up 
design of my own, more of an enhancement of the CCI kit.

This is all very premature thinking as I am building the kit for my 
personal use and it was an afterthought that others might be 
interested in the amp as a low-cost step above 10w but not all the 
way to 500w.  I am not thinking of a major production of these - more 
a small niche business by which I might self-fund my 
hobby.  Definitely, a zero-inventory approach where I would build on-demand.

The KPA-100 and KPXA-100 may be too attractive for there even to be a 
market.  But no harm there as I will not be making a major investment.

I had originally been thinking of building a HF/6m 8877 amp but this 
would require 60w to drive.  I have a 2m-8877 so the HV and grid-bias 
ckts are already done and could be switched between 2m and HF.  But I 
really do not need QRO for HF; 200-300w will be enough.  The final 
thing that killed the 8877 project is I have acquired a Harris 
Platinum 1100w 6m sspa so there is no motivation for making a 6m-8877.

Let me end this by saying this is all speculative.  I need to build 
my personal EB-27 CCI amp kit and see how it works out, first.  It 
might be a prototype and then it might be one of a kind!

I hope to find time to build the kit before fall.  Right now I am 
loaded with other projects that probably will extend into July.

73, Ed - KL7UW

------------------------------

Message: 11
Date: Sat, 21 May 2011 07:08:29 -1000
From: Merv Schweigert <k9fd at flex.com>
Subject: Re: [Elecraft] KX3 - New 100 watt amp
To: elecraft at mailman.qth.net
Message-ID: <4DD7F18D.2020306 at flex.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Seems it would not be difficult to make a auto band switching amp from
that,
relays for each band to swtich the LP filters driven by the K3 band
outputs,
at that power level relays are cheap,  like the ones used in the AD5X
ALS-600 QSK conversion.   cheap and handle the power easily.  Make up
a circuit board and an enclosure for the amp,  really nice set up.
Another nice thing is that you can drive it with almost no power,  not
being
limited by FCC regs (unless you sell them built)  you can even drive
something
like a  4  MRF-150 amp with less than 10 watts to 600 output.
73 Merv




73, Ed - KL7UW, WD2XSH/45
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