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UNID 570 station 3/20/2010

C

crainbebo

Tonight around sunset, I heard something under KVI on 570.

570: Heard Chinese language lessons (english sentences repeated in Chinese.) Who in the heck plays Chinese/English lessons on 570?!?! Quite a weird experience. Almost copied from China Radio International's SW relay. Harmonic?

-crainbebo
 
crainbebo, if you are using a Grundig G5, than you may be hearing CJVB 1470 from Vancouver on 570. I have a Eton version of this radio; I once heard a strong local 1230 on 330 kHz. 1470-570=900; 1230-330=900.
 
crainbebo said:
Tonight around sunset, I heard something under KVI on 570.

570: Heard Chinese language lessons (english sentences repeated in Chinese.) Who in the heck plays Chinese/English lessons on 570?!?! Quite a weird experience. Almost copied from China Radio International's SW relay. Harmonic?

-crainbebo
Click to expand...

On the West Coast, this is almost certainly an "image" as ddsparxx suggests. The local oscillator in your radio operates 450KHz above the frequency it's tuned to (in your case, 570+450=1020); it mixes with the desired station (in your case, KVI) to create an "intermediate frequency" signal on 450 which is amplified & sent to the speakers.

If there's a strong signal on 1470, it too will mix with the local oscillator to create a signal on 450. (1470-1020=450) The rest of your radio can't tell the difference between this signal and KVI.

_________________________________________________

Another common cause of this kind of thing are harmonics of the local oscillator, causing 49-meter shortwave stations to come in at the top of the regular AM dial. But there aren't any particularly strong 49-meter shortwave signals on the West Coast (unlike the East where Radio Havana and Radio Canada International are LOUD) and the numbers don't work when you're tuned at the bottom of the AM dial. (80-meter hams, on the other hand, you might hear...)
 
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