| Author |
Message |
    
hawk1
| | Posted on Friday, December 26, 2003 - 1:05 pm: | 
|
while talking to my wife ssb i would hear myself after unkeying the mike.thought someone was tapeing me so moved to a random channel,,it did the same thing..this lasted about 10 minutes then quit..the echo was real faint but it was me..iposted this on another fourm and got a couple replys ,,would like to know u guys opinon
NOTE!
hawk1,
Could you please use your PASSWORD when making post's.
Thanks
Tech808
|
Topten
| | Posted on Friday, December 26, 2003 - 6:35 pm: |
|
Heard of this happening before, and it is certainly possible with the right conditions.
Wish it would happen to me! BTW, what frequency were were you on and what time
of the day was it?
73's & Happy New Year 2 U  |
Radiodude
| | Posted on Friday, December 26, 2003 - 8:29 pm: |
|
That is called "long path" sounds just like echo!!! |
Kiwikid
| | Posted on Monday, December 29, 2003 - 2:42 am: |
|
Hi hawk1 and Team,this reply is a bit late but Long Delayed Echos,LDE, have been around along time and this is what you may have experienced.
One site discusses them hear:http://www.ac6v.com/propagation.htm
73
Happy New Year
and the Best of DX for 2004 to All!
CEF195
Kiwi Kid
|
Chillydog
| | Posted on Monday, December 29, 2003 - 11:26 am: |
|
I too have heard of this happening before, but I've never heard my own echo. It may explain something I heard just the last week or so; maybe what I heard was someone else's long path echo.
I was driving north along I-5 in Northern San Diego County. My radio was tuned to channel 17 when I heard some nearby bleedover. Found the transmitter on 29, and it turned out to be a couple of guys, one very close to me, holding a general conversation while they were on the road.
Nothing interesting in that, and I started to tune back to 17 when I noticed that the farther transmitter had an unusual echo. It wasn't like any echo mic or board I've heard before.
I'm not sure of the delay, but it was on the order of one or two, maybe three, seconds. The echo was complete in that every syllable of each word was present; the strength was significantly less than the original transmission. (I wish I would have thought to look at the S meter, but it didn't cross my mind at the time.) Overall, the echo was something like a "stadium" echo, but not as promenent.
It lasted for about one or two minutes, just long enough for me to hear it and then notice that it was unusual. I was getting ready to break into the conversation to ask about it when the echo just stopped, virtually in mid-sentence.
At this point my cell phone went off, and I had to take the call. By the time the call was over the two people had passed out of range; I never had a chance to talk to them.
This was the strangest echo I've ever heard, and not at all like something a noise toy would be designed to do. Neither guy commented on it, so it may have been that I could hear it and they couldn't; I do tend to run with squelch open for max sensitivity. Or it could be that it was just a different type of noise toy that I haven't heard before. I just don't know!
Still, based on the stories I've heard of "world wide skip" this may have been an example of it ...
Best Regards,
Bob |
Ca346
| | Posted on Monday, December 29, 2003 - 2:30 pm: |
|
Interesting web site. This used to happen to me all the time when I was using a certain Gov't cell phone that would connect to a sattelite and result in an echo in BOTH sides of the conversation.
It was extremely hard to concentrate on the conversation when I was hearing my own voice also!
Jim |
Taz
| | Posted on Monday, December 29, 2003 - 4:19 pm: |
|
Who needs an echo mic when we have this? |
Hawk1
| | Posted on Monday, December 29, 2003 - 6:49 pm: |
|
thanks for info,havnt heard it since the last time..this happened on sideband on regular channels in the afternoon..think ill keep a little recorder by my radio in case it happens again,,a couple locals didnt believe me ....hk |
707
| | Posted on Tuesday, December 30, 2003 - 4:57 pm: |
|
It happens. The stuff they talk about in that link above deals mostly with VHF and UHF moonbouce, but on HF, I used to hear that back in cycle 21 a lot when the 'ol Woodpecker was still around. You could hear the 'pecker and a slightly delayed signal coming from the opposite direction. Sometimes, you could hear really strong Australian or South African stations from both directions with a slight delay. It gives a really interesting sound to the DX. |
707
| | Posted on Tuesday, December 30, 2003 - 5:11 pm: |
|
Using a bit of math, you can determine it takes approximately 1/7 of a second for a radio signal to travel around the world, not counting the extra delay introduced by the fact the signal doesn't travel in a straight line, but bounces along the way. So, assume the station you are hearing is quite near you, you would hear a 142 millisecond delay on the signal coming around the "other way". That is just over 1/10 of a second or 100ms, which is about the threshhold that we humans can readily discern as an echo or reverb effect.
This doesn't take into account other interesting theories about "pumping" the plasma clouds or any other highly scientific explanations. |
Chillydog
| | Posted on Wednesday, December 31, 2003 - 11:54 am: |
|
707,
You know, when I was writing my contribution to the thread, I considered calculating the time it would take for a radio signal to circumnavigate the globe, but didn't want to bother with looking up the Earth's dimensions. Thanks for doing so.
Given the results of your calculations, my experience couldn't have been global skip; the delay was much greater than you figured. (Unless it was the result of _dozens_ of trips around!)
I've got no explaination for what I heard. If it was a noise toy, it was the stupidest echo box I've ever heard, and in my never-to-be-humble opinion they're all stupid. If it wasn't a deliberately generated echo, I now have no idea of the cause of the phenomena! Wish I did ...
Best Regards,
Bob |
707
| | Posted on Wednesday, December 31, 2003 - 2:56 pm: |
|
chilly-
there is documentation out there detailing how during very extremely high power HF experiments, it was possible to pick up the signal up to 3 Times around! That's a BIG RADIO.
I have heard what you are describing, and I'm not sure what it is. I know there are ways to create that effect very simply to irritate the heck out of folks, using one of those cheap Radio Shack "simplex repeater" boxes. They are made for FRS radios, but would work fine with a CB. It listens to its input, when it hears something, it records it, then keys up the radio and plays it back after an interval. Then of course there are the "CB noise toys" out there that do the same thing.
I used to do the same thing with the old SoundBlaster parrot program that came with sound cards. |
|
