[ICOM] Location of low pass filter

[Joe K I 5 F J]

John,
Why do you want to use a Low Pass Filter?
30 Yrs ago they were needed because the purity
of the Tx Power was not as clean as today's modern transceivers.


If you are using a "Older Rig" AKA boat anchor, then the filter might be helpful.
I use a old E.F. Johnson LP Filter on the output of a AL-80BQ amplifier.
The reduction of unwanted power greater than 30 MHz is probably unnecessary.

73
Joe O
NNNN




________________________________
 From: Larry Benko <xxw0qe at comcast.net>
To: ICOM Reflector <icom at mailman.qth.net> 
Sent: Tuesday, May 8, 2012 5:15 PM
Subject: Re: [ICOM] Location of low pass filter
 
NO!  The lowpass filter is designed to be at a 50 ohm impedance which is 
probably not what you would see on the output side of the tuner.  Also 
the voltages/currents on the line on the output side of the tuner could 
damage the lowpass filter.

73,
Larry, W0QE

On 5/8/2012 5:09 PM, John G. wrote:
> 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
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
----
Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/
To support QSL/QTH.net: http://www.qsl.net/donate.html