Re: [IRCA] Re : 1710

["Mark Durenberger" <Mark4@xxxxxxxxxxxxxxx>]

You're right; that "image" can actually be produced by two station's signals 
mixing...although that usually happens when they're both strong signals. 
Interestingly, the mix can be happening external to your receiver.  (One 
station's signal can be introduced into the other station's transmitter and 
the combination heads out the tower.)

Grand Junction CO is a good (bad) example of that happening, where (among 
others) a 620 signal gets into 1230 and 1340 transmitters, producing images 
at 610 and 720.

You've probably tried another radio by now; if the image is there as well, 
something like the above may be happening.

All sorts of weird things can pop up.  I know of a station that generated 
images only when a tape machine was in the "record" mode.  Turns out the 
bias oscillator in the recorder was mixing with the station's signal.

The fact your receiver is digitally tuned may be irrelevant...most of them 
can deliver the same images as an analog-tuned radio...if the mix is 
happening outside your radio.

What are your other local station frequencies?  I can run a prediction 
program for you.

Regards,

Mark Durenberger

--------------------------------------------------
From: "bill kral" <jwkral@xxxxxxxx>
Sent: Thursday, December 16, 2010 4:17 PM
To: <irca@xxxxxxxxxxxxxxxx>
Subject: [IRCA] Re : 1710

>  The signal on 1710 was much stronger last night around midnight but I was 
> a little dismayed at what I heard.It turned out to be a mix of my local 
> 900 and KGO 810 SF so I tried to figure out how an IF image of those two 
> signals could show up on 1710. 455 Khz x 2 is 910 so 1710 - 910 = 800 . 
> that doesn 't quite fit in but it's not that far off. Does anybody out 
> there know how this can happen with a digitally tuned receiver? And does 
> the signal strength of the fluctuating image depend on KGO's signal as the 
> other part of the mix is a local which is normally steady all the time? 
> There is no trace of any 900 image daytime so I can safely assume that it 
> is the addition of 810 to the 900 that produces the image.Any possible 
> explanation would be welcome. Thanks. Bill in BC
>
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