[Elecraft] Microphones (was electronic product standards)

[d.cutter at ntlworld.com]

> I've heard it said that some contest stations deliberately transmit a wider-than-necessary signal to keep competitiors away from "their" channel.

David
G3UNA

> 
> > 
> Within the context of SSB useage in ham radio I believe that the 'hype about 
> audio' could lead to another related problem, if not already existing, which 
> is poor use of the HF spectrum available to us. Given the proven fact that a 
> SSB transmitter filter bandwidth of 2.1 kHz will result in the transmission 
> of a very 'good quality' speech signal, provided that the carrier is 
> positioned properly and that the mic - audio - modulator system 
> characteristics suit human speech, I see no valid reason for using wider SSB 
> filters. In addition to the increased amount of spectrum used, the use of 
> wider filters followed by linear amplifiers whose IMD products might be only 
> 30db or so below a test tone obviously results in a wider 'Interference 
> Bandwidth', and should be discouraged IMHO. Adding Reverse ALC to the mix 
> can further increase interference.
> 
> Just an opinion.
> 
> 73,
> Geoff
> GM4ESD
> 

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