Jack makes excellent points. I would like to elaborate on one comment he
made:
"...open-wire feed. There we don't care about the mismatch since
the feedline loss is microscopic. The RF currents balance themselves
out so that the feedline doesn't radiate. But we then need a decent
tuner to fe
The voltage on my meter is 13.65 with no load.
With K2/100 set for 50 watts out the voltage drops to 13.3 with a string
of 15 wpm dashes.
At 75 watts it drops to 12.75 volts.
At 100 watts it drops to 12.2 volts.
Due to the large capacitance, it takes several seconds to drop to the
levels measu
Don suggested this would be worth posting...
When dealing with antennas, things are never as "precise" as we might
want them to be. Folks talk about antenna tuners as if they work
magic, then wonder why things aren't as good as they should be. An
ATU at the shack in line with a coax-fed ant
Good Evening,
Forty meters worked better than twenty this evening. There was a lot
of QSB on twenty which prevented Pat from working me with his K2. He
switched to the 100 watt Ten Tec and made it through. Thank you, I
dislike missing someone who is trying so hard to check in. The sec
Fellow K2 builders,
Well my K2 has been up and running now for about 2 weeks. I finished
building the KAT2 last week and finally put up an antenna that should be
able to work 80 - 20m this weekend. My previous antenna was a 20m attic
mounted horizontal loop fed with coax. The new one is a 1
Same results at this location - Mother Propagation rules :-)) - 72 Bruce.
-hope they try agn -
72/73 - Bruce ve5rc/ve5qrp - QRP-C#1, QRP-L#886, A1 Operator
Enter QRP-Canada's "RUN with RAC" contest -
details - http://www.qrp-canada.com
-Original Messa
I gave it a good try, but the bands are in really poor shape. Even
40m seems strangely quiet, with only an XE2 as DX appearing above
7.032. No EU at all heard.
Anyone else care to report?
73
seab
aa1my
==
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Doc,
I was thinking of the link coupled parallel or series tuned type of coupler
which was at one time known as an Antenna Matching Unit before the name
Antenna Tuner became the norm. The Johnson Matchbox was an example, and such
'tuners' can convert a considerable range of impedances as prese
Thanks much for the notice, Jim.
I listened/called on 20m for >45 min. but no signals of any kind were
heard
Moved to 10.116 at 0100z 30m -also really on empty.
Will be listening/calling CQ on 7.030 > 0200z, hoping for the best.
Perhaps start on 20m earlier tomorrow?
72/3
seab
aa1my
=
Zac,
Why guess?
You can find the antenna feedpoint impedance for various bands on L B
Cebik's website (at least it used to be there) www.cebik.com .
Armed with that information along with the known length of your feedline,
use TLW which you can download from the ARRL website
http://www.arrl.org/n
John
Can you tell us how well regulated the output voltage
seems to be between key up and key down?
Thanks and 73
Bob N6WG
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of John Buck
Sent: Sunday, October 01, 2006 3:01 PM
To: elecraft@mailman.qth.net
Subject: R
Is anyone using their K2 with a PAC-12 antenna? I am interested in hearing
your comments.
Mark Saunders, KJ7BS
Glendale, AZ
K2 S/N 0539 KSB2; K160RX; KNB2; KAT2; KIO2
FISTS # 2972 CC 1806
SKCC # 2240
AZ ScQRPion
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Ignition noise from large trucks??? All of the ones I've seen are diesel -
no spark ignition at all!
Such trucks often make a lot of hash from various electric motors, etc. -
just the sort of thing the NB can't touch.
Did you remove jumper W5 from the K2's RF board when you installed the NB?
If you want to splice balanced line, you can do a simple splice with two
wire nuts of both the same size.
That theoretically, would affect each side of the line the same and preserve
balance. Your tuner takes care of that and any other "bumps'' even the
mixing of 300 ohm and 450 ohm line to co
I have had one of these supplies for several months.
It works as advertised and easily supports my rigs on 100W SSB and cw.
The advertising does say no radio noise and I have found none. It has
modern 25 Farad super capacitors in series for a 5 Farad output
capacitance.
It is a perfect compa
In my K2 # 5422 - I built two (2) NB kits, with no
luck in either doing much with "noise". For sure
it did nothing on ignition/truck noise (3 cement
trucks outside our doors). And it did nothing
to reduce or change what I call repetitive
popcorn white noise signals on bands.
Hooked up to a wet n
I'm sorry but I need to add this before Zac Brown does something
real stupid. When using 450 ohm feed line you must use this EXACT
length. The exact length is that which goes from the antenna to the
balun in your shack.
Any talk about matching the 450 ohms is not correct. The feed line
So what's the best way to add some more line to the middle of my
feedline? Is there a technique for joining two pieces of 450 ohm ladder
line that doesn't create an imbalance in the line? Can I just leave one
"leg" straight and then wrap the corresponding "leg" (on the other
piece) other arou
I posted this on Friday, but only got one response. I still could use some
advice. By the way, the KPA-100 is still sitting beside the K2 (connected
by the three cables running "over the wall"). Thank you.
73,
Phil Shepard
NS7P
-Original Message-
From: Phil and Christina [mailto:[EMAI
Perhaps Elecraft might like to consider adding an 'old fashioned' type of
balanced antenna tuner to their product range, with a balun at the
transmitter connection, to make it easier to match some types of antenna
system to the transmitter? One that could be used outside and be remotely
contro
Steve,
The feedline is actually 65 ft long. It happened to be the perfect
length from the antenna to my radio, but I could add some more line in
the middle if needed. I'd just have to make the feedline take a less
direct path through the attic. What would you suggest as a good
feedline len
I just did a noise test and found either no noise or almost no noise on
all bands.
I hooked the Gamma Research supply to my K2, along with the internal
battery.
I disconnected all other connections (RS232, key, antenna).
I set the mode to USB and the Preamp=ON and spot checked the bands from
Hi all,
Just wondering, is it possible to tie the K2's sidetone level to the
volume knob? I know how to set the level via the menu and all, but
I'd find it much more convenient if the sidetone got louder/quieter
along with everything else, when adjusting the volume.
Thanks and 73 de
Step
I'm using a new Astron RS-20A. I used it during the build/test phase
and now operating. It is overkill for the stock K2, but when I
eventually build the amplifier, I'll need it. I know lots of guys use
gel-cell batteries to power their K2s. Maybe somebody more
knowledgeable about the K2s power req
Zac:
I'm guessing that the configuration that you propose could run you
into all sorts of trouble on 80 M. The problem is that the 135 ft
flat top would have low impedance, about 50 Ohms. The transmission
line is disturbingly close to a quarter wavelength. A 450 Ohm line
with an exact electri
I have a 135' OCF (Off Center Fed) dipole which is coax fed with a 6:1
balun at the feedpoint, and it works on all bands from 80-10 except 15
with my K2/KAT2. Performance seems very good an all bands except 30m,
where it's just OK.
Larry N8LP
Karl Larsen wrote:
Zac Brown wrote:
Fellow Ele
Good point Karl! I don't have an MFJ to compare but I will bring it
along to AmTech day or Pacificon to test. It fits in my front pocket.
73,
Leigh/WA5ZNU
On Sun, 1 Oct 2006 4:39 am, Karl Larsen wrote:
Leigh L. Klotz Jr wrote:
With 5 farads of filtering it's a probably a bit quieter than the
Just received word from W4DU that tonight Sunday (z Oct 2) there
will be extra effort to work QRP stations stateside.
Here is where W4DU/K8DD/AC8W/G0BPS will be listening:
z Oct. 2 (8PM EDT) - 14060 Khz
0130z (9:30 EDT) - 10116 Khz
0200z (10PM EDT) - 7030 & 7.040 Khz
The calls to look f
Tod,
I am assuming that you are the builder of your KX-1. Go through the
troubleshooting and testing sections in the manual. Post what you find.
73 Larry KB5DXY
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Zac Brown wrote:
Fellow Elecrafters,
I am putting up a 135 ft flat-top at my QTH. I'll be feeding it with
about 60 ft. of 450 ohm ladder line, connecting the feedline to the
BL2, and tuning it with the KAT2.
With the balun and auto-tuner you have a great antenna system!
However it may be
Glad to report K2-5701 up and running. I have the following options ready to
install :-
KPA-100; DSP; 160m option; noise blanker; ssb option
Is there any particular preference in order for installing these please ?
Great kit - no bits missing - and K2 rx sounding very good
Terry
_
Tod, look for a short in the +12 circuit to ground. The swollen batteries
suggests they were feeding lots of current into a dead short for a long
time.
Open the unit and do the resistance checks at the top right column on page
54 of your manual. If those checks disclose a short, follow the PCB tr
Fellow Elecrafters,
I am putting up a 135 ft flat-top at my QTH. I'll be feeding it with
about 60 ft. of 450 ohm ladder line, connecting the feedline to the BL2,
and tuning it with the KAT2.
I was wondering if anyone on the list has tried this arrangement and
could comment on whether the KA
On Oct 1, 2006, at 9:29 AM, Karl Larsen wrote:
Tod Glenn wrote:
Greeting all,
I have a mail into elecraft, but thought I'd throw this out to the
list.
I took my KX-1 out camping a few weeks ago, where it was working
fine. I finally unpacked it yesterday, and much to my dismay, it
see
Tod Glenn wrote:
Greeting all,
I have a mail into elecraft, but thought I'd throw this out to the list.
I took my KX-1 out camping a few weeks ago, where it was working
fine. I finally unpacked it yesterday, and much to my dismay, it
seems to be dead.
Here's what I discovered:
The LED wor
Greeting all,
I have a mail into elecraft, but thought I'd throw this out to the list.
I took my KX-1 out camping a few weeks ago, where it was working
fine. I finally unpacked it yesterday, and much to my dismay, it
seems to be dead.
Here's what I discovered:
The LED works fine, so it's
Leigh L. Klotz Jr wrote:
With 5 farads of filtering it's a probably a bit quieter than the MFJ.
The Q of a 5 Farad capacitor is not good. It will carry the peak
current from a SSB transmitter but it will not control RF noise. This
comes from the high frequency chopping of the input 120 Volts
Alex, I have his V2.1 Code disk but he doesn't identify the speeds of his
various Mp3 files. So I was hoping somebody had the speed range I am looking for
to include with Arrl Mp3 files.
I will look at this RFZXP and Just Learn Morse Code.
Thanks for the tips.
Dick, NJ9K
-Original Messag
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