Brett
Do not hurry but enjoy !!!
Happy user of K2/K1/KX1
73 de aki, ja1nlx
[EMAIL PROTECTED]
http://www.asahi-net.or.jp/~yy7a-ysd/
http://ja1nlx.exblog.jp/
- Original Message -
From: Brett gazdzinski [EMAIL PROTECTED]
To: elecraft@mailman.qth.net
Sent: Friday, March 16, 2007 2:16 PM
My K2 has just got to the 7 MHz receive stage so can't really comment yet but I
have used both the Watson Power Mite and the Watson W25 SM extensively in
wanderings portable round Africa and both performed well. I checked them both
for spurious noise and drew a blank - use them at full cable
Thrilled to get my K2 working on 7 MHz receive but I seem to have a problem
with filter settings.
Everything has checked out according to the book - no problems at all (even my
home-wound coils seem to work!!)
I have set up the filters exactly according to pages 88 and 89. On Filter 1 the
rx
I fancied doing this for my screwdriver antenna but I thought I could do
something similar without actually detecting polarity: simply, if I guess
wrong the SWR will go the wrong way and I just have to reverse the switch;
which could be done automatically. I'd like to see the article to avoid
Folks,
There is an error in the reply I sent last night (below) that is very
important - it makes a big difference.
When increasing or decreasing the frequency to determine the sign of the
reactance:
One must observe the increasing or decreasing of the IMPEDANCE (Z) and not
just the reactance.
Thanks for the clarification, Don. As I mentioned in my private email,
to eliminate all ambiguity, you really need to look at the slopes of
both impedance magnitude and phase (or alternatively resistance and
reactance). This will cover you for both sides of either series or
parallel resonance.
And the Spectrogram marker you've set to your preferred
CW note (offset) will enable you to center the passbands
on that frequency
73! Ken Kopp - K0PP
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Don Wilhelm wrote:
Folks,
There is an error in the reply I sent last night (below) that is very
important - it makes a big difference.
When increasing or decreasing the frequency to determine the sign of the
reactance:
One must observe the increasing or decreasing of the IMPEDANCE (Z) and
Thinking about building my 2nd K2. First # 54xx,
was a very sucessful build.
Does anyone have thoughts on how well the K2,
operates, by itself, as a SSB HF rig? It would
seem 15W is kind of pushing it for a suitable
signal - but just wondered if any successful
K2 SSB ops are around.
And I've
I'll be the third to chime in on how useful the spectrogram method of
aligning filters is. The first time around (without spectogram) I
noticed similar results as you did, then I did the spectrogram
alignment and it got *much* better, but it still wasn't right. Third
time, it got even better.
Hi Fred
I run my K2 at 5w all the time as a QRP station.
I enter many of the major contests and have a
great time.
You do need to be a bit thick-skinned, though, as
you will often be walked on by higher power stations
that just don't hear you. Or they call the station you
are calling at the same
Very interesting question. When sunspots were good, i never hesitated even on
20m (unless there was a huge pile-up) to speak into the mic of my QRP K2. It
rewarded me with lots of QSOs (using a vertical antenna).
Recently I decided to check out its IF filtering across busy bands in the
Nick
you did not say if you are receiving CW or SSB (i presume likely SSB since it
is more BW dependant in fidelity).
if you dont have the SSB adaptor installed, all the filters may be a little bit
narrower than many HF rigs. when/if you add this board you will have an even
higher fidelity
Ran my K2 barefoot on SSB and CW for about a year before getting around to
building the KPA100 amplifier, was having too much fun jousting with the big
boys over 'Outside of Europe' DX on 40m. K2 earned its keep on SSB and the
old story is true, it's the antenna's performance that counts.
73,
Original Message
Subject: Re: [Elecraft] K2 - How good on SSB?
Date: Fri, 16 Mar 2007 12:05:31 -0500
From: RC kc5wa [EMAIL PROTECTED]
To: Curt Milton [EMAIL PROTECTED]
References: [EMAIL PROTECTED]
Curt
Using my K2 #4948 @ qrp ssb 9watts I worked 42 of 50
states on 80/75
Then there's my experience. I ran the barefoot K2 in one of the big SSB
contests this past fall (Nov SS?). I got buried. In the CW contest, I
easily worked 50 people. With the same effort in SSB, I worked maybe 15
and several of them were really struggling to copy. That was on 40
meters with
Seem to have a problem. Most gain is with no pre-amp (sounds fine). Some
attenuation with att on and more attenuation with pre-amp on. Have checked out
T6 - seems soldered OK. Any thoughts please?
Many thanks to those who responded to my filter post - very helpful indeed. 73
Nick G3RWF
I'm looking at buying a DX Doubler and am wondering if the Kenwood cables
will work on a K2. The web site doesn't mention K2s.
Any help will be appreciated.
Thanks es 73,
Randy, K7TQ
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You
I have made more than 1000 QSOs (85 DXCCs so far) using QRP K2 and have
always got excellent reports, using a simple inverted vee dipole antenna
ONLY.
It is true I have missed a few DXCC entities like Aghanistan, Korea,
Jibouti and South Africa because I could not get over the pileup of big
guns,
Nick,
Are your getting voltage to the collector of Q21 (measure on the case - 11
to 12 volts)? If you have no voltage there, check T6 again and R74.
Be certain the leads of T6 are the correct color - leads 1 and 3 must be of
the same color.
If all is well above, then check R75, R76, R77 for
SSB ... No problem..
I got my K2 in the middle of 2001, KPA100 in late 2002,
now mostly use SSB and 100W, (after mars 2005 sometimes 1kW)
Antennas dipole, vertical
Results:
QSO's: 6181 From {17 Feb 2001} to {11 Mar 2007}
Countries: 219, SSB: 208, CW: 123
Now I use the 2.4kHz SSB filter,
No
I did not mention that obviously, one has to watch both the impedance
variation and the reactance term to use my approximation to finding the sign
of the reactance. Larry's antenna is a good exception to the performance of
simpler antennas.
Most ham antennas have well defined harmonic related
Randy, by coincidence I have just ordered one which I hope to collect
doing my trip to Texas next week for the FOC Social Weekend. I asked for
one cable for my FT1kMP and one generic cable so that I can put my own
plugs on.
I have a back to back trip to IS0 also so won't be able to try it out
Just FYI the input/output pin voltages on my new MAR-01 are exactly as Gary
suggested they'd be. The N-GEN's noise signal increased markedly when I turned
OFF the ANT for the 160m accessory, but there's still only about an S4 LED
lighted. On all other bands (except the top half of 10m)
I just received some parts from Mouser and one was a 22uf. tantalum cap...I
can't figure out the polarity mark,is it the long lead that is + ?? Thanks,
John KF7OM
Yes, I tried the vom and got a read both ways. Thanks, John
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Thank you list for all the replies, all you have to do is ask and
bingo...thanks for the info...John KF7OM
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Glad to see Elecraft got mentioned fairly quickly in the posts.
http://www.eham.net/articles/16158
--
David Wilburn
[EMAIL PROTECTED]
K4DGW
K2 #5982
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OK folks, this is kind of a weird one but here goes. I have been using my
K2(#726)-KPA100-KAT100 lashup for some years now and just recently noticed that
when I am in SSB mode and hit the dot paddle the K2 seems to occasionally hang
in TX. The receiver goes dead and usually hitting the dot
SN#1510$400 I pay shipping, OBO you pay shipping.
US Postal Money Order, US Orders only.
Pat N8VW
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Todd,
The dot paddle line is the same line as that used for PTT - so you can
activate PTT by holding the dot side of your paddle (handy with a desk mic),
or the other way around, if you are operating CW, you can use the mic's PTT
button to send a string of dots.
If you just touch the dot paddle
Thanks Don,
I have discovered that for this to occur it requires that I hit the dash
paddle at nearly the same instant as the dot paddle. It is very infrequent.
I will try to check this out further. It may happen once every 50 tries.
Todd, WA7U
- Original Message -
From: Don
I got my front panel board done today, and
started on the RF board.
So far all seems good, very easy to build, at least
so far
In case anyone is wondering, they are up to SN 6065!
I have read a bit here about setting up the filters, and it being
critical, and you need the spectrogram
Brett,
You will find Spectrogram easier to use than a spectrum analyzer. Think of
Spectrogram as a spectrum analyzer for the audio spectrum (which it is). In
general, it will offer better resolution than an RF spectrum analyzer and
will provide a plot of the audio response of the K2.
Your
Brett, N2DTS, asked:
I have read a bit here about setting up the filters, and it being critical,
and you need the spectrogram software. Well, it seems to me if you need that
to set the rig up so it works correctly, it should be included with the kit?
==
Good point, Brett, and
i STILL haven't started the build on my k2 yet, as i have been too busy
playing with my k1..
anyway..
when it comes time to align the filters, i don't have a windows machine
anywhere..
is there a suitable program for mac or linux?
thanks!
--
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peace,
sergio
photographer, journalist,
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