SV: [AMPS] Low Pass Filter

[Tom Rauch]

Hi Hans,

> Is not a high pass filter terminated into 50 ohms a better solution then a
> low pass filter? The latter is only maybe seeing 50 ohms on one frequency
> and on harmonics looking into something else than 50 ohms? 
> 
> Hans

It makes very little difference, once the frequency is away from the 
cut-off frequency of the filter, if it is terminated or not. 

In many cases adding a dummy load and high-pass network to 
pass harmonic power into the load makes things worse, not better. 

The layout and shielding is often more critical than anything.

As Mauri points out...in very populated areas with cable TV, the 
problem is more often overload than harmonics. 

In rural areas with direct reception of off-air signals, shielding and 
filtering of the transmitter's harmonics is a major concern. 
73, Tom W8JI
w8ji@contesting.com

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