[UK-CONTEST] RX performance

[Clive Whelan]

I don't think you missed it Ken, and I didn't mention it because I 
assume it is a given.


However in case that's not the case for newer contesters, only use your 
NB or any other add-on device of that ilk in when absolutely necessary 
as the effect on IMD is likely to be dire.

In case it also slips under the radar, disable as much pre-amplification 
as possible. My own rig ( IC756PROIII) may not be typical, but on 
3.5,7&14Mhz all pre-amps are disabled. On 21Mhz in current conditions 
pre-amp 1 is enabled and on 28Mhz preamp 2 is sometimes used. However 
when there are a few sunspots I even disable all preamps on 21Mhz.

 G9BF ( sadly now SK) used to opine that one should use max. urge in 
P.A. and max. length of wire in antenna, but if he were around today he 
would be better advised to recommend min. pre-amplification and moderate 
attenuation in the rx front end ;-)


73


Clive
GW3NJW



Ken Eastty wrote:
> Unless I've missed it no one appears to have  mentioned that noise 
> blankers frequently degrade the strong signal handling performance of 
> some receivers, it's always worth switching the NB off as well as 
> attenuators on to see whether this reduces the unwanted effects that 
> very strong signals have.
>
>