Re: [IRCA] KNBR-940

[Michael Hawkins <downsized99@xxxxxxxxx>]

Glenn,
   
  I think you're right.  KGO is strong enough here (8 miles directly north, over water, in their beam) that they take out 800 and 820 and still heavily distort 790 and 830.  I am also about 10 miles SSE of KNBR with their 50KW ND antenna.  Needless to say, there's a bunch of non-existent things on the radio in this location.
   
  Mike

Russ Edmunds <wb2bjh@xxxxxxxxx> wrote:
  
--- Glenn Hauser wrote:

> KNBR on 940 would be a leapfrog mixing product, as I like to call
> them On SW,
> of 680 over KGO 810, a further 130 kHz. Are the KGO and KNBR sites
> close enough
> to interact? It could be an external mixing product, not necessarily
> receiver-produced front-end overload. 73, Glenn Hauser, OK
> 


This is a classic example of a sum-and-difference spur. These can be
caused by interaction between transmitters close in both frequency and
proximity; from re-radiation from any number of possible metallic
onjects in the local area; or from problems at the receiving site,
which could be in the receiver or in the antenna system.

If one is using a loop, antanna system problems are less likely, and if
the spur is nullable, it can be nulled toward the transmitters,
indicating the first option, or elsewhere, indicating the second. If it
isn't nullable, that's usually indicative that it's at the receiving
end.



Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id

FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Hammarlund HQ-150 & 4' FET air core loop



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