On Tue, 07 Jun 2005 15:02:38 -0700, MadEngineer wrote:

Wes Hayward in _Experimental Methods for RF Design_ bemoans the fact that
our transmitters are so dirty in terms of noise floor, close-in phase
noise and IMD.

This is not such a big issue at HF where band noise
is relatively high. Keeping noise and distortion to
a minimum is a lot more important on VHF where noise
is low, local stations are very strong and everyone
has an ultra low noise preamp. I can operate within
+/- a few KHz of some of the cleaner local VHF stations.
Some of the nastier ones need about 30KHz of elbow
room.

any homebrewers out there who are working this problem?

Many homebrewers put a lot of effort into keeping
phase noise and IMD to an absolute minimum. Some
of the cleanest signals on the 80M band can be
heard on the homebrew net frequency (3.727MHz).

73, Ed. EI9GQ.


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