[Elecraft] Re： [K3] K3 VS 7600 Sherwood List

[Geoffrey Mackenzie-Kennedy]

>From Guy Olinger K2AV
Sunday, September 06, 2009 3:24 AM

> In general are you talking about CW or SSB or both?  If SSB, I find
> that the controlling aspect of close signals is transmitted splatter,
> which no receiver can do anything to improve. Some really poor front
> ends make that worse.


Hi Guy,

Without doubt there are many SSB transmitters heard on the ham bands which 
do generate splatter, but the operator of a "clean" and properly driven SSB 
transmitter risks being accused of generating splatter by somebody whose 
receiver is generating the splatter. You have mentioned poor front ends, to 
which I would add poor filters (in terms of Group Delay Variations out to 
the stopband regions), and small dynamic range IF systems as found in many 
if not most commercial amateur receivers.

If the ARRL would run complete dynamic range tests, then 'weak' IF systems 
would be exposed in the reviews.

Transmitter generated splatter can be dealt with by a receiver, but the 
receiver's IF system MUST have a large in-passband 3rd order dynamic range 
if analog splatter removal techniques are used.

73,
Geoff
GM4ESD