Darrell,
In your example, the 160 meter half wave will work FB on 160 meters with a
feedline that is 1/4 wavelength at 160 meters. For all other ham bands, the
situation is different - the antenna length will still be a multiple of 1/2
wavelentghth, but the feedline will also be a multiple of a h
Paul, KD3JF wrote:
My only comment is, first of all I am not an engineer and I am not savvy
always on the ins and outs of antennas, but my gut feeling is that a "L"
network tuner is the better for all circumstances than a "T" network tuner.
Good 'gut'
My only comment is, first of all I am not an engineer and I am not savvy
always on the ins and outs of antennas, but my gut feeling is that a "L"
network tuner is the better for all circumstances than a "T" network tuner.
Paul Gates
K1 #0231
KX1 #1186
XG1
[EMAIL PROTECTED]
- Original Mes
On August 8, 2005 07:30 pm, Ron D'Eau Claire wrote:
> Many Hams try to use lengths other than 1/2 wave for the radiator and 1/4
> wave for the feeders. When you do that, all bets are off. It's like any
> "non-resonant" doublet or end-fed wire. They can work well, but you must
> have a matching netw
Darrell asked:
So how would the Elecraft BL1 Balun do with the End-Fed Zepp? Depending on
the
ground losses, the impedance could be 5000 ohms or so. Would the 4:1
transformation ratio still hold true? What would the efficiency of the balun
be? Would 100 watts from a K2/100 cause saturation of th
On August 8, 2005 07:03 pm, W3FPR - Don Wilhelm wrote:
> If your antenna is end fed (like the example of an end fed dipole), the
> impdance at the antenna feedpoint will be high, but if the feedline is an
> odd multiple of a 1/4 wave (elecrtical), the impedance presented to the
> shack loaction sho
Darrell,
It all depends on the electrical length to the feedline at the frequency of
operation. Sorry, but no better answer exists.
If your antenna is end fed (like the example of an end fed dipole), the
impdance at the antenna feedpoint will be high, but if the feedline is an
odd multiple of a
On August 8, 2005 01:39 pm, Stuart Rohre wrote:
> L. B. Cebik, W4RNL, explored the "im balance" of the end fed Zepp antenna,
> a half wave with open wire feed where one side of the wire connects to
> nothing, and the other to the antenna end element.
>
> That would seem to be the extreme case of cu
Jess,
In general, if it worked once, the firmware is likley not to blame. Check
the soldering on the front panel carefully - especially pin 1 of U1 - you
can solder it from the socket side if you cut away a bit of the plastic.
The normal reuslt of an unsoldered connection is that it works sometim
Steve,
If you have both the KPA100 and the KAT100, the wattmeter in the KAT100 is
the one that will be used - so calibrate the wattmeter in the KPA100 without
the KAT100 attached (just use a good 50 ohm dummy load), and then set the
KAT100 wattmeter as instructed in the manual and all should fall
Hi Don,
Sorry, I forgot to mention that I have tried using several Wattmeters after
the KPA100 and before the KAT100, and they all pretty much agree. I will
calibrate the pot as you suggest. Thanks.
Steve, W2MY
-Original Message-
From: W3FPR - Don Wilhelm [mailto:[EMAIL PROTECTED]
Sent
Steve,
How are you determining the power output? Is the 8 watts and the 40 watts
what is indicated on the K2 or what is indicated on an external wattmeter.
If it is an external wattmeter, then the answer is easy - calibrate the
forward power pot in the KPA100.
OTOH, if the power indication is on
Hi all,
My KPA100 seems to be performing well. However, when I'm in tune at low
power I get about 8 Watts out and with High power tune is producing about 40
Watts out. I think its supposed to be 2 W and 20 W. What should I do?
Steve, W2MY
--
No virus found in this outgoing message.
Checked by
On 8/8/05, Stuart Rohre <[EMAIL PROTECTED]> wrote:
> This was done for a floating system, or a closed system, ie dipole in space,
> no other ground. That would pretty well approach the floating system you
> have used on rock.
>
Well, my thinking went like this:
Imagine I connected a 3/4 wavele
Hi Gang,
It's time to start burning solder again so I'm offering my complete K2
station up for sale. It consists of the following:
K2 - Xcvr (ser # 35xx) w/latest firmware
KPA100 - 100w Amp
KSB2 - SSB adapter
KAT100 - ATU
KDSP2 - DSP module
KAT2 - 20w ATU w/original lid.
All manuals, errata sh
Hi Reggie, I built my own and adapted it to my supports available, (too low
for the 40 feet of ladder line for my version.)
What did I do to make it the K5KVH antenna?
I put the ladder line horizontal, from the center, to a tree, and a back
stay guy to the center insulator to keep dipole straig
L. B. Cebik, W4RNL, explored the "im balance" of the end fed Zepp antenna,
a half wave with open wire feed where one side of the wire connects to
nothing, and the other to the antenna end element.
That would seem to be the extreme case of current imbalance but he found
typically, there is only
Hello all,
I had a great time activating two lighthouses and the Overfalls
Lightship in Delaware. I played radio and when the Qs stopped I hit the
beach for a dip or two! I camped at Cape Henlopen State Park again this
year.
***One important item***
If you worked me at USA-222, USA-366 or USA-
Greetings everybody.
I got on 14050 at 2335UTC for ECN & heard the following here in the far
north of ZL1. Using my K2-100 & a 1200ft horizontal loop.
N0SS559, some QSB, but generally solid.
KR7W/6 339, QSB into noise.
KT6JS 339, QSB into noise.
and, last but by no means least(!),
KD5ONS
Darrell,
My comment about heating was in regards to saturation, which greatly
increases loss. At QRP levels a BL-1 will never saturate, even if it is
working into a very low or high impedance. OTOH, at high power, a
severe mismatch really *will* heat up the balun, and if it saturates,
it will
On August 8, 2005 10:29 am, wayne burdick wrote:
> at QRP levels, a large balun such
> as the BL1 should have negligible heating loss over a very wide
> impedance range.
I would have thought that the heating is a result of inefficiency. The heat is
lower at QRP levels than at higher power levels
Bob
The idea of a balun is to provide balanced drive to the transmission line
so that it will not radiate, saving that for the antenna. Part of the
idea is to reduce TVI etc due to feedline radiation, and part is to
preserve the directivity pattern of the antenna. A radiating feedline
tends to an
On Aug 8, 2005, at 10:01 AM, Darrell Bellerive wrote:
If I recall the BL1 was designed for a 200 ohm load. Will
it still do a 4:1 conversion if the load is 1000 or 2000 ohms?
Yes, although the higher the impedance, the more the balun's own strays
will come into play. (Note also that at QRP l
On August 8, 2005 09:48 am, wayne burdick wrote:
> But a balun should be helpful with antennas that present
> a high impedance to the tuner, for two reasons: (1) it steps the
> impedance down by a factor of 4, which may help if the tuner's range is
> limited;
Doesn't the impedance conversion degra
On Aug 8, 2005, at 9:29 AM, Bob Cunnings wrote:
So far I've not bothered with a balun when running my KX1 into a
dipole fed with balanced line (using the internal tuner to match) and
seem to have pretty good results, better than the random wire and
counterpoise so far (portable operation over p
So far I've not bothered with a balun when running my KX1 into a
dipole fed with balanced line (using the internal tuner to match) and
seem to have pretty good results, better than the random wire and
counterpoise so far (portable operation over poor ground). My thinking
was that since the whole sy
Anyone using a zs6bkw gr5v care to comment on it's use for qrp operation
from the home?
thanks in Advance,
Reggie k6xr in Southwest Bakersfield, CA.
and for a great FAQ ( Frequently Asked Questions ) see http://groups.yahoo.com/group/FT817/database
Some really good technical info a
Jay wrote:
All tuners will eat up some percentage of your RF output power.
The ones with toroid or smaller inductors may eat up more power.
Jay, John, etc.:
The physical size of the inductors would only be a factor if they were
also inefficient (dissipating a lot of heat). In all of our tune
All tuners will eat up some percentage of your RF output power.
The ones with toroid or smaller inductors may eat up more power.
Just how much power depends on the reactance/impedance transformation
required and the
Quality of the components.
You can see that a test using a 50-ohm wattmeter on th
Well, what you really want to do it to "get out". I imagine the near field
is directly proportional to the far field, in terms of "power" (whatever
that really is), so a field-strength meter much closer to the antenna than
the shack should give a good relative indication of output. So, if the T1,
w
Hi,
I am reposting my ad for the discontinued MH-2 microphone since the person who
wanted it never sent me money.
Please respond directly if interested.
Thanks
Mike, WA1SEO
K2 #4778
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