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Re: [IRCA] image frequency question
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.
Cheers,
Ty
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We frequently get these on SW, from two frequencies at the same transmitter site: leapfrog mixing products, in this case 970 leaping over 910 another 60 kHz further down to land on 850. Unless KOA simply wipes out the image strengthwise, probably 970 or 910 changes antenna or is off the air at night eliminating the image. Check whether 970 and 910 are at the same site, even diplexed on same antenna. Another way of calculating these is 2A minus B. 730 would leapfrog over 910 in the same way upwards to land on 1090, 180 kHz apart. If you are really close and overloaded, this could even happen without the stations being at the same site or tower. 73, Glenn Hauser
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