[Antennas] Receive vs Transmit
Bryan Fields
[email protected]
2003年2月16日 13:23:46 -0600
On Sunday 16 February 2003 13:03, [email protected] wrote:
> I think there are two reasons why receiving with untuned antennas is not as
> much of an issue: First, as you point out, many older receivers have an
> antenna trimmer which will cancel out at least part of the mismatch between
> antenna and receiver. Second, your sensitivity, especially on the lower
> bands, is limited by external noise. So if I have a "broadband" antenna
> with 10 dB of loss, it will not affect my reception provided the external
> noise is at least 10 dB above receiver noise floor.
Except if you use a tuned antenna you now have a medium/high Q resonant
circuit, that will filter some out the out of band noise. You may notice the
band quiet down as you bring the antenna into tune, I know I do.
73's
--
Bryan Fields, KB9MCI
____________________
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Logic is a pretty flower that smells bad.