[UK-CONTEST] BCI on 7020

[Clive Whelan]

Nope, I've got a good one!

IMD3 requires TWO signals to produce the sprog., as detailed in the maths
below. If for you say, G3NKC is on 7010 and a.n.other is on 7015 with an
equally gignormous signal, you might hear "headless chickens" on 7005 and
7020. If this sounds familiar, reduce your front end gain, and the sprogs
will disappear quickly. If the offenders however are on 7010 and 7012, then
probably no roofing filter is going to help, and gain tailoring is
mandatory.  Alternatively get an IC7800 or FT9000 :-0

The sig. you refer to is the LF part of an idling teletype, you can hear the
HF signal almost exactly 1khZ HF of that. The origin is probably closer to
NE than E, but my antenna is not that sharp to be honest. 10kW+ doing
nothing, so much for environmental awareness eh :-((


73


Clive
GW3NJW



-----Original Message-----
From: uk-contest-bounces at contesting.com
[mailto:uk-contest-bounces at contesting.com]On Behalf Of G3SJJ
Sent: 13 January 2006 20:12
Cc: UK Contest Reflector
Subject: Re: [UK-CONTEST] BCI on 7020


Can we swop receivers?   7017.68 = funny noise, 20 over s9, to the East.

Chris JJ



Clive Whelan wrote:

>JA1CQR is there now( 19:20), 549 no BCI
>
>
>GW3NJW
>
>-----Original Message-----
>From: uk-contest-bounces at contesting.com
>[mailto:uk-contest-bounces at contesting.com]On Behalf Of Clive Whelan
>Sent: 13 January 2006 19:11
>To: UK Contest Reflector
>Subject: Re: [UK-CONTEST] BCI on 7020
>
>
>2*7120-7220=7020  IMD3?
>
>Gignormous Russian speaking station on 7220
>
>
>73
>
>
>Clive
>GW3NJW
>
>-----Original Message-----
>From: uk-contest-bounces at contesting.com
>[mailto:uk-contest-bounces at contesting.com]On Behalf Of G3SJJ
>Sent: 13 January 2006 16:21
>To: UK Contest Reflector
>Subject: [UK-CONTEST] BCI on 7020
>
>
>Anyone hearing the FM stuff on 7020. Definitely from the East, I seem to
>detact Russian but Fred K3ZO says it sounds Portugese maybe from Brazil.
>In which I wouldn't think it was a harmonic! We are being tageted more
>and more by non amateur stuff in this band.
>
>Chris G3SJJ
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