My Tecsun PL-398MP occasionally receives false broadcast stations but it's caused by overloading with an external long wire antenna. This had been mentioned by another RU-vid channel author who reviewed the same radio two months ago. The same thing happened to my old Toshiba RP-2000F BCL receiver back in the 80s, when I used a 40 foot long random wire extending out to my garden. At the time I didn't really understand what antenna overloading was and was puzzled by receiving certain stations on frequencies that they shouldn't be on but they mainly occurred on lower HF bands like 60 and 75 meters. My PL-990 has not showed signs of overloading with the same external antenna, though. No shortwave stations transmit on the 11 meter band, let alone on 29555 kHz as most SW radios are limited to 26100 kHz. 📻🤔 Does your PL-990 receive harmonic signals on the higher frequencies other than 29995 kHz?
Devils knows what)) This has never happened, the 990 always behaves quite firmly and correctly, no anomalies. There was a pumping station next to me, maybe it was the cause of this poltergeist, but I had previously received different frequencies at the same place and had never observed anything like this.
@@wavezone2566 I quite had forgotten that you have other shortwave receivers that covers up to 29999 kHz. Did you also test your PL-660/680 as well as your Tecsun S-2000? If no other receiver captured the harmonic frequency at 29995 kHz, then your PL-990 might have had a case of the gremlins inside it. 📻😉
Can only be overload, happens at higher frequencies on these radios but only when I'm using external antenna at night on the 330 and H501x, even notice it on the 680. If you change the antenna to local it might not overload ? I noting that this helps a lot.
Could it be an image frequency (Mirror Frequency) of 15,700 kHz (The Voice of America)? 29,555 - (10x(oscillator image frequency: 465 kHz)) = 15,700 kHz, which coincides with, among others, The Voice of America?
@@wavezone2566 Yes. Correct . Sorry. I have performed the mathematical operation from memory and the result is wrong. I mean the sub-multiples of the main frequency. Could it be a sub-multiple of the main frequency?
