Hi All,
My solution, though not cheap, is to feed at the centre of the doublet with 450
ladder line, and tune at 5ft above ground to a SG230 auto tuner, and then any
length of 50 ohm coax, preferably double screened. I have no troubles with any
rfi etc from noise sources, pc's, switch mode
Hi Bryan,
Your approach as you say solves a lot of problems. I use someting similar
here using antennas each matched to 50 ohms, but a remote ATU would be a
better approach and would certainly add to a multiband capability. From a
remote coax multi-position antenna select switch, the main
Thanks to all who responded to my question about termination.
Now another: What is the limiting factor in the power rating of the coupler?
With either the 20db (max 25W), or the 30db (max 250W) the power delivered
to the secondary is 0.25W. The terminating resistors are rated at 3W. Are
there
Hi Paul,
I use Popes H-100 coax. It has a braid screen and then another screen of copper
tape wound on top of that. There is very little leakage through that, and
vitually no penetration from outside. Hence the double screen coax. There are
many other versions too, but they are rather
This is nothing new but it bears repeating.
I had the day off today. After replacing the wire in my 40m loop I
made sure the K1 could tune up on 7/14/21.
After checking 15 and hearing nothing I started the sending CQ with
the keyer in repeat mode while cleaning
the
My 2 cents worth is: Theory is one thing and actuality is another thing. I
use a 130 ft inverted vee, fed with about 55 ft of 450 ohm ladder line. The
apex of the vee is about 65 ft up. The ladder line stops at the eave of my
house, just outside the shack, where I use a 4:1 balun. From
Tod,
Somewhere between your power supply and the anode of D2, there is a problem.
It may be a high resistance in a connector or a burned PC board trace or a
relatively low resistance (but not zero) path to ground which is dragging
down the power supply output. With the power source de-energized,
I would strongly warn everyone who uses this method of feeding the centerfed
tuned feeder dipole about a problem with this. Let me start by saying I have
done it and still do it with lowered powered rigs (under 100 watts).
There IS a danger, that of overheating the 4:1 balun and losses in the
George N4YM wrote:
I use a 130 ft inverted vee, fed with about 55 ft of 450 ohm ladder line.
The apex of the vee is about 65 ft up. The ladder line stops at the
eave of my house, just outside the shack, where I use a 4:1 balun.
From the balun to the homebrew tuner, I use a 7 or 8 ft
piece
George wrote...
I guess the moral to this is, don't let theory stop you from trying stuff.
I would like to add what I firmly believe is the ONLY absolutely true law of
physics when it comes to antennas. I learned it in the mid-50's and it is
just as true today...
If it stays up, it ain't big
All checked out OK
I just completed the voltage checks on page 27 of the assembly manual
Here's a comparison of the results when working versus now
U1 pin 1 was 4.94v now 19.5mV
U3 pin 6 was 6.05v now 2.47v
D2 Anode was 14.83v now 2.7v
D2 cathode was 13.75v now 2.5v
Voltage measured at the
On Oct 3, 2006, at 1:35 PM, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
Tod Glenn [EMAIL PROTECTED] wrote:
On Oct 1, 2006, at 10:34 AM, Ron D'Eau Claire wrote:
Tod, look for a short in the +12 circuit to ground. The swollen
batteries
suggests they were feeding lots of current into a
Tod,
Ok, you have an open circuit somewhere between the power supply and the
anode of D2 - there are only a few pieces involved - the wire in the power
cable, the male connector, the female connector in the KX1 and a bit of PC
board trace going from the connector to the anode of D2. Continue the
On Oct 3, 2006, at 4:36 PM, Don Wilhelm wrote:
Tod,
Ok, you have an open circuit somewhere between the power supply and
the
anode of D2 - there are only a few pieces involved - the wire in
the power
cable, the male connector, the female connector in the KX1 and a
bit of PC
board trace
I have been using the KAT100 for about a month now. I very much like
its operation. My question:
After the relays click and the SWR is nearly 1:1, on 7.007 MHz with
a G5RV, my output is limited to 20 W.
I adjust for any higher level and I get 20 out (on LCD). It seems at
ANY freq on ANY
James Duffey wrote:
KArl - You wrote
A 100 feet of RG8X is a looser for QRP.
Well, WD4LST was using 100 ft at 40 M, which amounts to 0.6 to 0.8 dB
of loss depending on the feedline pedigree. RG-213 is about 0.5 to 0.6
dB at the same length and frequency, so the RG-8X looks pretty good,
Thanks to all.
The Problem turned turned out to be a defective U5 the LM2930 8v regulator
that was outputting 10.99 vdc and causing WHITE NOISE GALORE.
Thanks especially to Don Wilhelm W3FPR
RC kc5wa
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