I'll have to admit that I have done a LOT of work on 10 meters in the last
47 years, including many contests (W5PR, KZ5MM, KE5FI, WA5IHS, DL4FQ etc)
and I have never heard an echo longer than about half a second. I HAVE had
people record me and play it back. (Which is both weird and amusing.)
Take heart though, if you are being "heckled" it means you are loud. It
comes with the real-estate!
Chuck W5PR
>
> OK, let's think about it. Radio waves travel at the speed of light,
> and a 10 second delay would translate to about 1.86 billion miles
> before it was again heard. That is approximately the distance to the
> Planet Saturn, or assuming an Earth orbit, a complete round trip 7,410
> times.
>
> You could assume a large dish antenna with 50 db of gain, and a loss
> of 1 db per trip, and the signal would be in the mud on the 148th
> trip. That would leave approximately
> 7262 more trips around the Earth until it was received and heard. Not
> to mention the vast improvements in receiver noise floor in over 40
> years.
>
> Tape recorders have been around for a long time. So has elementary
> math. Recorders change with time, math doesn't.
>
> In no way do I mean to doubt Zack's word about it, but it simply is
> not possible as an LDE.
>
> On my own recollection of received LDEs the longest I ever heard was
> the letter B of my call at about 35 wpm, and that was also on 10
> meters.
>
> I leave it to someone else to figure the gain and power needed to
> bounce a HF signal off Saturn, which is actually twice the distance.
> Even our best orbiting telescopes are not capable of that.
>
> 73
> Ed
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