Re: [IRCA] Image Frequency Question

[kj8o@xxxxxxxxxx]

Here in the Detroit Michigan area, we have at least one intermod:

FM band: 98.7 + 105.9 = 204.6 / 2 = 102.3 and due to the capture effect
   on FM, only the stronger of the two signals (98.7) is heard. Both
   transmitters are approx. 5 miles apart from each other. 

And as a side note, back to the original request, I'd look at 730 + 970 = 
1700 / 2 = 850, especially if 73 is a daytimer and if it is heard on more 
than radio.

Good job, and 73 de Joe, KJ8O, Troy, MI



On Mon, 23 Feb 2009 16:28:16 -0700, Deane McIntyre wrote
> On 23-Feb-09, at 1:46 PM, Ty T wrote:
> 
> > Hello,
> >
> > While the topic of frequency imaging is being discussed, I have one  
> > to ask.  Here in Billings, MT I can pick-up our local 970, KBUL on  
> > 850 during the day.  It comes in just like it was actually on 850.   
> > At night, it is no longer present and KOA Denver usually comes in  
> > like a local themselves.  Any ideas why 970 images onto 850?  The  
> > other locals here are 730, 790, 910, 970 and 1240.  The only other  
> > imaging I have noticed locally is a faint image of 730 onto 1090.
> >
> 
> Most likely a mixing (intermod) product with your local on 910.
> 2 x 910 - 970 = 850
> 
> 2 x 910 - 730 = 1090, which gives you your other mixing product
> 
> Here in Calgary I get a few of these from our 50 kW locals on 660,  
> 770, 910, 960, 1010, 1060, 1140:
> 
> 2 x 660 - 770 = 550
> 
> 2 x 960 - 1060 = 860
> 
> 2 x 1140 - 1060 = 1220
> 
> are the worst
> 
> 73,
> 
> Deane McIntyre VE6BPO
> Calgary AB
> 
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-- Joe Miller, KJ8O, Troy, MI -- Grid EN82 --
--- WOW! Homepage (http://www.wowway.com) ---

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