[AMRadio] RE: GB> Antenna Tuner Wonderings


CHRIS PAPAIOANNOU amateur at ipnet.gr
Sun Dec 26 23:26:57 EST 2004


Happy 2005 to all,
Allow me to ask: is this windom the Windom's wire windom or some of the
later modified windoms?Then why resonant antennas are not necessary
allthough convenient?
73 Chris Papaioannou SV1DAF.
----- Original Message -----
From: "Donald Chester" <k4kyv at hotmail.com>
To: <amradio at mailman.qth.net>; <macklinbob at msn.com>;
<glowbugs at piobaire.mines.uidaho.edu>
Sent: Monday, December 27, 2004 3:27 AM
Subject: RE: [AMRadio] RE: GB> Antenna Tuner Wonderings


>
>
> >From: "Merz Donald S" <merz.ds at mellon.com>
> >Reply-To: Discussion of AM Radio <amradio at mailman.qth.net>
> >To: "Bob Macklin"
> ><macklinbob at msn.com>,<glowbugs at piobaire.mines.uidaho.edu>,"'Amradio
> >(E-mail)" <amradio at mailman.qth.net>
> >Subject: [AMRadio] RE: GB> Antenna Tuner Wonderings
> >Date: Tue, 14 Dec 2004 11:14:24 -0500
> >
> >Thanks for your reply.
> >
> >OK, Yes, I understand. Some of the rigs here are homebrew and the output
> >network designs are all over the lot. On the antenna side, there are
> >situations here like a vertical with a poor counterpoise that will have
25
> >or 30 ohms to match at some frequencies. Then there's the Windom, which
> >isn't resonant anywhere. IMHO, resonant antennas are convenient, but
> >certainly not necessary (thank God).
> >
> >73, Don Merz, N3RHT
> >
> >
> >-----Original Message-----
> >From: Bob Macklin [mailto:macklinbob at msn.com]
> >Sent: Monday, December 13, 2004 5:56 PM
> >To: Merz Donald S; glowbugs at piobaire.mines.uidaho.edu; 'Amradio (E-mail)
> >Subject: Re: GB> Antenna Tuner Wonderings
> >
> >
> >With BA unit wit Pi networks you don't need a TransMatch (they ARE NOT
> >antenna tuners). Most will match anything between 50 and about 500 ohms.
> >One
> >exception is the Heath DX-60. It is limited to 50 to 75 ohms becase of
the
> >built in LP filter.
> >
> >You need a resonant antenna for each band you want to work. Some could be
> >multi band antennas.
> >
> >A TransMatch does not correct antenna problems. It hides them from the
> >transmitter. The Pi network in the BA rigs is the same thing that was in
> >older transmatches to connect link couples transmitters to coax lines.
> >
> >It is the solid state riceboxes that really need a transmatch.
> >
> >Bob Macklin
> >K5MYJ/7
> >Seattle, Wa.
> >
> >"REAL RADIOS GLOW IN THE DARK"
> >
> >
> >
> >----- Original Message -----
> >From: "Merz Donald S" <merz.ds at mellon.com>
> >To: <glowbugs at piobaire.mines.uidaho.edu>; "'Amradio (E-mail)"
> ><amradio at mailman.qth.net>
> >Sent: Monday, December 13, 2004 2:23 PM
> >Subject: GB> Antenna Tuner Wonderings
> >
> >
> > > As most of you know, I am a long time BA collector and inexperienced
> >operator. I am getting there. But it's a learning process <grin>.
> > >
> > > I have the shack structured (in the loosest sense of the word...) into
a
> >number of stations (20-25 with about 10 in actual operation). These
mostly
> >consist of a transmitter/receiver pair with T/R relay and RX muting. The
> >stations are in the range of 40 to 250 watts max. I run these into your
> >choice of 5 or 6 crappy, mostly non-resonant antennas with connections
> >being
> >made through a home-made SO-239 "patch panel".
> > >
> > > Most of my interest is in AM operation on or near the supposed "AM
> >windows" on 80, 40 and 20. I have some rigs that I never change bands on.
> >My
> >operation is often xtal-controlled but I have VFOs on some of the rigs.
> >Most
> >of these old BA transmitters are pi-net outputs.
> > >
> > > So here's the deal: I can tune any of these stations into a 52 ohm
dummy
> >load and set up the rig easily enough. Now I switch to one of my crappy
> >antennas. And of course, it is nowhere near 52 ohms at the desired
> >operating
> >frequency. If the mismatch isn't too bad, I can re-tune the rig's output
> >network. If the mismatch is ugly, or if the output network is limited in
> >range, then I can  "insert antenna tuner here" to get a match.
> > >
> > > After a while, laziness sets in. Why should I have an antenna tuner
for
> >each rig?--especially if I never change bands on that rig? Wouldn't it
make
> >more sense to dedicate an antenna tuner to each antenna? I can use my
> >little
> >Palomar Tuner Tuner to match to pre-set each antenna to 52 ohms for each
> >frequency of interest and mark each antenna tuner accordingly. Then I can
> >simply load the rig up for 52 ohms into a dummy load, select an antenna,
> >set
> >the antenna tuner to my previously-marked 52 ohm point for that frequency
> >on
> >that antenna, patch the rig into the antenna tuner--and push-to-talk.
> > >
> > > Ok, sure, this setup put the antenna tuner over at the patch panel and
> >not
> >on top of the rig. Pretty inconvenient. But hey, there's 20-25 stations
to
> >deal with here. I'm supposed to have 25 antenna tuners? OTOH, I have only
3
> >antennas that are sloppily non-resonant enough to require a tuner at the
> >frequencies I am interested in. So that's 25 tuners (okay, I'm
> >exaggerating--it would probably be only 10-15 tuners because the other
> >stations probably have adequate output networks) versus just 3.
> > >
> > > This trade-off seems worth it to me. But experience is in short supply
> >here. So "pray tell me"** experienced ones, what am I missing? What is
> >there
> >about this idea that is bad?
> > >
> > > Any thoughts appreciated.
> > >
> > > 73, Don Merz, N3RHT
> > >
> > > ** When Winston Churchill was named First Lord of the Admiralty in
1939,
> >he was famous for firing off memos with questions to subordinates that
> >began
> >"Pray tell me...". In the Royal Navy, these soon became known, obviously,
> >as
> >"the Lord's prayers".
> > >
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