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Re: [CQ-Contest] Bandpass filter

To: "Jukka Klemola" <jpklemola@gmail.com>, "cq-contest" <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] Bandpass filter
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Tue, 3 Jul 2012 14:28:09 -0400
List-post: <cq-contest@contesting.com">mailto:cq-contest@contesting.com>
> Correct for fully functioning and tuned amplifier.

40 milliwatts or so is a correct worse case for any amp, in or reasonably 
out-of-tune, unless someone homebrewed something terrible.

Very few radios are damaged by 200 milliwatts, or 23 dBm.

The damage problem is always fundamental energy damage of a receiver.

The only harmonic issue is interference.


> Regarding a far-away receiver, correct.
> An immediate next property neighbor might get a frying shot into the front 
> end.

>From fundamental, which takes a receiver filter at his end to stop, but 
never from a transmitter harmonic. It may help sell transmitter filters to 
worry about harmonic damage to a receiver, but it is an imaginary worry, not 
a reality. A transmitter filter is really only to lessen interference 
problems operating near harmonic frequencies, not at all required to prevent 
equipment damage.

http://www.w8ji.com/antenna_coupling.htm

73 Tom

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