You can run the HFPacker amp at 12v instead of 24v and get less current
draw and less power out. Plus it would be smaller. Also you don't need
to build the output filter on the K5OOR board since your K1 doesn't
cover 160-10...you could build a switchable filter for just the 2 or 4
bands you use and make it into a small 2-board solution.
Leigh / WA5ZNU
On Sun, 3 Apr 2005 6:51 am, david feldman wrote:
Hello Jim,
The two solutions I've looked at so far are unappealing (going all the
way
to the 100W level, or the hfpack-based project which includes a DC/DC
converter to run it's transistors at 28V, which has it's own efficiency
impact.)
I have been looking for a more modest power increase, perhaps to
25-50W,
optimized for CW (no need for idling collector current), and suitable
for
operation at collector voltages down to ~9V (to be consistent with K1's
input voltage range, which is a big value to me.) The Ten-Tec 405 is
a little closer (2W in gives 50W out, and consumes 7-8 amps at full
output,)
but I'm not sure how it does at lower collector voltages, it's linear,
it's bulky, and in any event, it's not produced. It would be great if
whatever
is developed could be mechanically part of the K1 (a new top cover, in
space
that would be occupied by the internal battery pack, for example) and
could
leverage the internal low-pass transmit filters (but for this the
toroids may have
a saturation limit, and I doubt the band modules were ever designed
with
this sort of use case in mind.)
I also had a short e-mail exchange with Wayne that ended in my
suggesting
a new 3-band module covering 80 and two other bands (perhaps 40/30 or
40/20); I think something like this would be really valuable as we are
now
at a lower point of the solar cycle than when the K1 was first
developed.
In any event, I hope the K1 is kept "alive" in terms of product
development!
73 Dave WB0GAZ [EMAIL PROTECTED]
From: [EMAIL PROTECTED]
Subject: [Elecraft] Feasibility of KPA-1(?)
To: [email protected]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="US-ASCII"
From Space Cadet To the Mother Ship (Elecraft):
I sure enjoy my K1, s/n #01453, and use it daily. However, there are
times
when I'm chasing DX that I'd like to be able to switch in a 10 dB
boost to my
output. Could we explore the feasibility of offering a kit amplifier
for the
K1 (say a KPA-1)?
I'd suggest that most owners of the K1 would immediately purchase it
(1500+
units?). It could also make the K1 more attractive to the part-time
QRPers,
like me. The only disadvantage that immediately comes to mind is that
the KAT-1
antenna tuner couldn't be used with it and would have to be removed.
However, perhaps the KPA-1 could be plugged in its place? Are we
looking at 7-8 amps
current draw, instead of 1 amp?
If you're a subscriber to this list and would like to see a KPA-1
amplifier
kit, please join me in letting Elecraft know.
R/ Jim K5HO
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