Anything between the LPF and ant with ANY amount of corrosive substance
(Relay contacts,diode effect, coax switches, poor solder joints,poor station
interconnects,etc.) will derate the LPF and make it useless.
Anyone agree? Jim.
----- Original Message -----
From: Vic Rosenthal <rakefet@rakefet.com>
To: Steve Thompson <g8gsq@qsl.net>
Cc: <amps@contesting.com>
Sent: Sunday, November 17, 2002 9:27 AM
Subject: Re: [Amps] LP filter effects
> Steve Thompson wrote:
>
> > > the diodes in the meter may generate harmonic energy themselves.
>
> > I think they don't - I failed to find measurable harmonics when I tried
> > looking, and Peter Chadwick found the same. I think he tested at higher
> > power than the 800W I had.
>
> I guess it depends on the design of the meter. The old-style 'monimatch'
type
> with parallel conductors definitely did generate harmonics, and was known
to
> cause TVI, hence the suggestion to put it in the line before the filter.
The
> Brune-type circuit using a toroid which is common today possibly doesn't
do
> this. Thanks to UHF TV and cable I don't worry about VHF harmonics so
much any
> more!
>
> Vic K2VCO
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