I run a 2 x 88ft doublet straight into my K3 and it matches top to 10
David
G3UNA
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David -
How high is it? What kind of feed-line are you using? How long is the
feed-line? Do you use a balun at the antenna or at the transmitter
end? Does the K3 auto-coupler show any symptoms of having trouble
matching one or more bands (long tuning time)?
- Jim, KL7CC
David
, July 03, 2008 6:44 PM
Subject: Re: [Elecraft] OT: K3 and antenna questions
David -
How high is it? What kind of feed-line are you using? How long is the
feed-line? Do you use a balun at the antenna or at the transmitter end?
Does the K3 auto-coupler show any symptoms of having trouble
I apologize for the bandwidth, but I really trust the sources of info here
and it may help someone else starting out like me with specific K3 info and
antenna theory.
I've been playing around with my K3 in a portable capacity out in my yard.
Here is the setup:
-K3 running @ 5W
-Antenna: 66'
Dave,
Yes, the law of reciprocity applies on both TX and RX, but the K3 has a
better receiver, so it is entirely possible for you to hear ones that
you cannot work. His signal report to you indicates that is likely the
case.
Try your antenna without the balun - you should not notice
Dave, W8FGU:
Your questions are most appropriate, Elecraft and Amamteur Radio related.
Dave wrote:
Now my questions:
1 - with my antenna setup tuned with the KAT3, knowing that we were both at
5 watts, is it possible for the antenna to be more efficient at receiving
than transmitting? I guess I
No apologies needed Dave. Based on the posts here over the past decade, your
question is *very* list-appropriate.
Don's comments are right on as always. Any warming of the balun is RF
energy that was never radiated. At low powers, any noticeable heating is
likely a big chunk of your power.
And
Dragging this slightly away from the topic - I've seen this said
before, so would like some explanation please.
I plan on using a doublet of non-determined resonance with my K3
portable. the arms are 18.3m and fedd with ~ 12m of 300 ohm ribbon (TV
type), supported by a 10m telescopic
A half-wave doublet center-fed with a quarter-wave of hi-Z feedline is a
worst case scenario.
A 66' doublet would be close to a resonant antenna on 7.0 MHz. Accounting
for the thin wire, would expect a 70 ohm center-feed impedance, even at that
height. It would appear that the length of the
Hey Don,
Thanks for the reply. I forgot to mention in the first post that I used this
last year in a slightly different spot and it was fed with 33' of open
feedline. I fed it directly from my K2 without a balun and it tuned up great
80m - 10m. To get 1:1 SWR on 20m I added 6' of feedline.
After
results
;-)
Thanks for the great info Ron.
73,
Dave W8FGU
-Original Message-
From: Ron D'Eau Claire [mailto:[EMAIL PROTECTED]
Sent: Wednesday, July 02, 2008 1:02 PM
To: 'Dave Van Wallaghen'; elecraft@mailman.qth.net
Subject: RE: [Elecraft] OT: K3 and antenna questions
Hi Dave,
I know I should also model this thing in EZNEC, but have not taken the
time
to learn how to use it yet. Seems a little daunting when I look at it.
When you do have the time to try EZNEC you will find that it is quite easy
to use. Transmission line programs are also very useful
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