[UK-CONTEST] AFS deliberate QRM

[David G3YYD]

I find that deliberate QRM during contest operating to be very low. It 
is very much worse working rare DX or DXpeditions. There has always been 
the odd SSTV person who thinks they own the frequency around 3727 to 
3735. If I operate on say 3530 outside contests and get deliberately 
QRM'd I stay even longer than I would normally so it becomes counter 
productive for the QRMer.

On the local club net this morning we were talking about AFS SSB and I 
did not find the QRM that bad from normal contest operation. I 
experience far worse band occupancy during ARRL DX phone, CQ WW &WPX 
SSB. However the local club members did find it bad. I am thinking that 
they are using rigs with relatively poor usable close in Dynamic Range 
on 80m and many of the signals were very strong. I am on the other hand 
using a K3 with its excellent close in Dynamic range especially with 
pre-amp off and 10dB attenuator in. The strongest non-local signals were 
up to about -20dBm at times. A level which causes IMD and signal 
compression in many receivers even with the preamp off and the 
attenuator on (assuming the rig has an attenuator).

David G3YYD



On 17/01/2010 11:39, ALEX LISTER wrote:
> Callum
> There was abuse down the bottom end also.!
> Attempting to find a spot to call CW was twice asked to move .
>
> Heard G3SDC getting almost constant abuse early on every time I tuned across, (QRM From G land)
> Worked you when u were getting deliberate EU QRM.
>
> Perhaps we have to rem that many of the Amateur community find Contests a pain in the bum.
> I used to try to avoid the SSTV frequencies but they seems to spread on Contest times ?
> And although unlikely to cause any interference during AFS the Disaster Emergency freq was avoided by me at least !  
> But its impossible on a crowded band to avoid all the net frequencies.
>
>
>
> --- @ WiseStamp Signature. Get it now
>
>
>
>
> ________________________________
> From: Callum MØMCX<callum at mccormick.uk.com>
> To: Alex GM3ZBE<alex at gm3zbe.plus.com>
> Cc: UK-Contest<uk-contest at contesting.com>
> Sent: Sunday, 17 January, 2010 10:03:18
> Subject: Re: [UK-CONTEST] AFS - operating out of band
>
>    
>>>> It really should be clarified
>>>>          
> I spent all of my time on 3.68 and had frequent intentonal digital 
> qrm, tuners and verbal abuse (EU accented). Next year i'll use the 
> lower segment.
>
> C.
>
> Sent from my iPhone
>
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