[Elecraft] K3 Transmit IMD

[G4ILO]

Geoffrey Mackenzie-Kennedy wrote:
> 
>  Julian G4ILO wrote:
> 
> The design of ALC systems is not a casual matter especially when dealing
> with human speech, and the points which you raise have to be addressed by
> the designer if the ALC might be used improperly. It would appear that ALC
> systems are too often used as speech processors rather than the protective
> system as intended.
> 
Very true. However much they obsess over published performance figures, most
hams when they get on the air are more interested in how far they can talk
up that RF out meter so they get heard by the DX, than whether they are
operating within the limits for minimum IMD products. :)

Years ago I had an outboard Datong RF Clipper and it was possible to set the
output level of that (which was the mic input of the rig) so that the ALC
barely moved. The K3 is the first radio I have had that has "true RF speech
compression" but it doesn't seem to be possible to set it up so that the RF
compressor does all the work. The method recommended by Wayne for setting
the K3 up is to turn the compressor to zero, increase the mic gain until you
get a few bars of ALC on peaks, and then turn up the compressor. So you are
applying ALC to an already compressed signal.

-----
Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
G4ILO's Shack: www.g4ilo.com
Zerobeat Ham Forums: www.zerobeat.net/smf
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