Thanks for your educated guess. It is valuable and I appreciate it.Based on the required antenna length, I would guess 350 MHz. to about 1.8 GHz. A Quarter Wave would be about 8 1/2 inches to about 1 1/2 inches. Above those frequencies circuits are difficult to construct, and power, with batteries for suitable power levels. I'm not an expert in such things so maybe some member will have a better guess. I would expect them to use a modulation technique that is not noticeable with an ordinary communications receiver. Something like PSK-31, JT65, FT8, or FT4.
So you still think I'm delusional? And my queries on these subjects has no basis in reality?Living in a glass house like you are, I'd be careful about throwing stones.
You are wrong, there was only one thread about it. Anyway if you don't want to participate, you are free to refrain from posting in my threads about these subjects.Since this thread starter has had two previous posts on this subject which were closed, why are we getting sucked into another one?
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