[TowerTalk] Are All Low-Pass Filters Alike? -

[Keith Dutson]

If the amp is a true linear and is not overdriven, can the filter be
inserted between the exciter and amp to solve harmonic problems?

73, Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of David Thompson
Sent: Tuesday, August 16, 2005 3:05 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Are All Low-Pass Filters Alike? -

I have a Drake TV-3300-LP that went south while operating 40 meters with my
8877 AMP running 1400 watts out.  Reading the filter its 1000 W Max which I
assume is input not output.  The coil in the filter melted at one end and
now rattles around inside the filter.

I also remember a B&W 1KW LP filter that arced over inside back in the late
60'S.  I had been using it with a single 4-400A amp at about 800 to 1000W
pep and the first transmission with a then new NCL-2000 amp cooked it.
Turns out they used this black plastic as an insulator.  I doubled the
plastic and it still works fine with my 500 watt spare amp.

Marshall Emm at Morse-X/Milestone Technologies bought AMECO two years ago
and might be able to answer questions on the AMECO filter.  HE has a web
page for MOrse-X.  I suspect its of the same design as the B&W and the Drake
and designed for the old KW input limit.

I do agree with K1TTT that they are probably not needed much today but they
sure make you feel more comfortable especially on 15, 12, and 10.

Dave K4JRB


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