I first meet Walt and his sons at Dayton about 10 years before his
death. Walt and his sons were/are some of the finest gentlemen that you
could ever meet. Walt was the type of person who was friends with
everyone he meet. It was a great loss to mankind and amateur radio when
he became a Silent Key.
Roger Steyaert K7RXV
On 7/18/2020 2:54 PM, Lyn Norstad wrote:
M. Walter Maxwell, W2DU (SK) passed away in 2012 at the age of 93. He was
still active.
ARRL has a brief bio here:
http://www.arrl.org/news/walt-maxwell-w2du-sk-wrote-reflections
73
Lyn, W0LEN
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lyn Norstad
Sent: Saturday, July 18, 2020 1:10 PM
To: 'Ted Roycraft'; 'Elecraft List Server'
Subject: Re: [Elecraft] Matching resonant antennas
The 428 page "Reflections III" from 2010 is available here in PDF format:
http://www.w3pga.org/Antenna%20Books/Reflections%20III.pdf
73
Lyn, W0LEN
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ted Roycraft
Sent: Saturday, July 18, 2020 10:22 AM
To: Elecraft List Server
Subject: Re: [Elecraft] Matching resonant antennas
Walter Maxwell’s interesting book, “Reflections”, has an in-depth
discussion on non-resonant antennas and tuners. Highly recommended.
73, Ted, W2ZK
On Sat, Jul 18, 2020 at 10:05 AM Lyn Norstad <l...@lnainc.com> wrote:
Exactly.
-----Original Message-----
From: W2xj [mailto:w...@w2xj.net]
Sent: Saturday, July 18, 2020 7:37 AM
To: l...@lnainc.com
Cc: barrylaz...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Matching resonant antennas
What is changing is the radiation pattern. As the frequency increases the
pattern becomes more sidelobes. Some of those sidelobes are bigger than the
main lobe and they radiate ‘somewhere’.
Sent from my iPhone
On Jul 17, 2020, at 21:19, Lyn Norstad <l...@lnainc.com> wrote:
Barry -
+1
I use nothing but 600 ohm OWL (True Ladder Line) and a short piece of
coax connects to a 1:1 / 4:1 hybrid balun to allow matching the impedance
perfectly with my KAT500.
The antenna is a 360' center fed EDZ (design frequency of 3.5 MHz). The
KAT500 matches it on all bands 160 - 6m (on 15m, it bypasses).
The measured performance indicates excellent radiation on all bands.
73
Lyn, W0LEN
-----Original Message-----
From: elecraft-boun...@mailman.qth.net [mailto:
elecraft-boun...@mailman.qth.net] On Behalf Of Barry LaZar
Sent: Friday, July 17, 2020 7:44 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Matching resonant antennas
Wes,
You're correct that open wire/ladder line transmission lines are
not a panacea. But, in the average ham stations, open wire does overcome
high losses with high SWR, or not so high SWR. What is needed is a look
at the ARRL Antenna book for transmission line loss/100 ft. as a
function of SWR. You see that on 10 meters running 10:1 SWR the total
loss is around 1 db. And, as you go to the lower bands, losses become
less. Typical 400 Ohm ladder line has a loss of 0.2 db at 10 MHz and 0.6
db at 100 MHz. Using these data and a little interpolation, I would use
0.4 db on 10 meters and a 10:1 SWR for this to be 0.8 db of additional
loss for a total of about 1.2 db. Yes, I do use a balun and recommend
them so add another 0.5 db. Add another 0.5 db for a good tuner and we
end up with a total of 2.2 db. on 10 meters and less on 20 and it
decomposes to an academic exercise on 40 and down.
Coax on 10 starts out with a higher loss/100 feet. I will use what
I use here in K3NDM, Times LMR400. That represents 0.4 at 10 MHz. and
1.4 db at 100 MHz. That will yield about 1.2 db/100 ft on 10 meters. Add
0.25 db for a 2:1 SWR and 0.5 for tuner loss and you end up with about
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