[TowerTalk] Antenna Tuner design

[Brown, James E LRDOR]

Hi Dick,

I use a tuner (not the 2060) that also has the "bypass" switch position and
dedicated SO-239 on the back.  I agree, it's a less than a real useful
design.  However, it's easily worked around with the addition of
two-position coax switch mounted within easy reach.  Your feedline is run to
the switch input.  Switch position 1 is jumpered to one of the tuner "tuned
input" SO-239s and position 2 is jumpered to the "bypass" SO-239.  This
allows straight through operation with a click of the switch (of course you
must then set the tuner switch also on "bypass").  When you want to use a
dummy load, you will have to unhook the "bypass" jumper from the switch and
connect it to the load, or else add a second two-position switch fed from
the "bypass" position of the first switch to switch between a dummy load and
the "bypass" SO-239 on the tuner.  Depends on how much you use the dummy
load.

Jim      W4LC

		-----Original Message-----
		From:	Dick Green [mailto:dick.green@valley.net]
		Sent:	Thursday, February 04, 1999 5:40 PM
		To:	towertalk@contesting.com; Bob Perring
		Subject:	Re: [TowerTalk] Antenna Tuner design



		>Beyond the differences of the 2060 having an in-out switch,
metering, and
		>components that allow the unit to go to 160 meters, there
is another
		>difference.


		In-out switch? My 2060 doesn't have one. It just has a three
position
		swith -- bypass, coax 1 and coax 2. Bypass goes directly to
a dedicated
		SO-239 on the back. The manual says that jack is for
connecting a dummy
		load. The other two go through the tuner to their respective
SO-239 jacks.
		All in all, it's a pretty silly design because it doesn't
allow for use of
		both resonant and non-resonant antennas on one feed line
(e.g., using a
		remote switch) or use of an antenna that's resonant in some
portions of the
		band but not others (e.g., an 80M dipole.) I have to recable
when I want to
		tune my 80M vee for the phone band (that's the only band
where I don't have
		a resonant antenna.) Were there different versions of this
tuner with and
		without the in-out switch or was your unit modified? I sure
wish my tuner
		had that in-out switch!

		73, Dick, WC1M



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