[ICOM] Location of low pass filter

[Joe K I 5 F J]

John,
I forgot to mention a ATU is often used to Z match when wide bandwidth operations are desired. Example: QSY Digital to Phone.

73
Joe O
NNNN



________________________________
 From: Mike Olbrisch <mike-2007 at elp.rr.com>
To: 'ICOM Reflector' <icom at mailman.qth.net> 
Sent: Tuesday, May 8, 2012 6:39 PM
Subject: Re: [ICOM] Location of low pass filter
 
That WOULD mess things up  -IF-  the antenna is not 50 ohms.  The filter
expects to see a 50 ohm input and output.  Anything else and your
performance may suffer.

If the radio and antenna are both truly 50 ohms (no SWR), then it doesn't
matter, and why use a tuner?

Vy73 - Mike - KD9KC.
El Paso, Texas - DM61rt.
W5-SOTA Association Manager.
NA-SOTA info: http://na-sota.org/




-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of John G.
Sent: Tuesday, May 08, 2012 17:09
To: ham-antennas at yahoogroups.com; ic706 at yahoogroups.com; ICOM Reflector
Subject: [ICOM] Location of low pass filter

I am looking at doing a little upgrading in some parts of the station, and
have a question about using a low pass filter.  THe current one I have is
between the rig and antenna tuner, which seems to be the common place to put
one.  Can a low pass filter go on the other side of the tuner-between the
antenna tuner and the antenna, or might that mess things up since the tuner
might now see the low pass filter as the load?

73 John AF5CC
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