... Yes. It seems in this case that the noise is not strong enough compared with the sferic, so that during the sferic, the only extrema are those of the...
16499
Paul
paul@...
Dec 1, 2010 9:03 am
Thanks John, I think the magnetopause is at about 10 Earth radii, so too near to give the delay. Those echoes are just too clean - anyone who has worked CW via...
16500
s f
sfusare
Dec 1, 2010 3:50 pm
Paul, I recall experiencing this myself as a new licensed teenaged ham back during the ~1980 solar max. It occurred during a SSB QSO on the 10 meter band as I...
16501
Peter, 54N 10E
df3lp
Dec 1, 2010 5:24 pm
Hi Paul, ... No and Yes. Auroral reflections indeed are sounding very hoarse. Reflections from Moon ("EME") in contrast are sounding very clean with remarkable...
16502
s f
sfusare
Dec 1, 2010 6:38 pm
... Stanford???) about Long Delayed Echos. Cannot find the citation... ... Several papers may be found here - ...
16503
Alan Melia
g3nyk
Dec 1, 2010 8:30 pm
Hi Scott they WERE anecdotal until Peter Martinez G3PLX produced a Hell' waterfall showing one, I believe. I can remember when that was , but I do remember...
16504
Lionel Loudet
lionel.loudet@...
Dec 1, 2010 8:31 pm
Paul, ... The word "monotonic" is a bit misleading here. It means here " no more than one minimum or maximum". The process would also have stopped with only...
16505
thb201
Dec 1, 2010 9:44 pm
In the literature on this matter it's suggested that ham radio operators switch frequencies (within the particular band) between each subsequent transmission....
16506
Paul
paul@...
Dec 1, 2010 9:57 pm
... Yes, I see now. I looked at the residue on p922 and it looked monotonic, but on closer inspection there appears to be a minimum at 17 seconds (and maybe...
16507
Paul
paul@...
Dec 1, 2010 10:15 pm
Yes it would be quite easy to hoax on 7Mhz, even if the tx changes frequency up to a couple of kHz or so. I remember reading about LDEs a long time ago, maybe...
16508
mlangen
mlangenf
Dec 1, 2010 10:25 pm
mlangen@... ... From: thb201 To: VLF_Group@yahoogroups.com Sent: Wednesday, December 01, 2010 3:44 PM Subject: [VLF_Group] Re: Long delayed echoes at...
16509
Ken Sejkora
quickhatch44
Dec 1, 2010 10:46 pm
With a delay as long as 46 seconds, it would appear to be easy enough to record (wav capture) the original call, and then turn around and use the recording to...
16510
mlangen
mlangenf
Dec 1, 2010 11:10 pm
Sure, but that presumes that somebody was all set up to do that and just waiting for someone like Peter to come along to spoof. If so, I would expect we'd be...
16511
Tom Becker
b19063
Dec 1, 2010 11:19 pm
... duplicating the original call with full fidelity and precision. As such, the timing and spacing of the re-transmitted characters would be verbatim of the...
16512
Thomas Ashcraft
heliotown27
Dec 1, 2010 11:57 pm
It is interesting to read about the 7 MHz signal delay story in the "Long delayed echoes at VLF?" thread. I have a related practical question. I audio record...
16513
Tom Becker
b19063
Dec 2, 2010 12:43 am
... If you are close to Fort Collins and are always in ground wave, the WWV path delay variability will be within 10uS or less - but, if you are some distance...
16514
Tom King
tking2097
Dec 2, 2010 12:55 am
Hi Thomas, I have maintained stratum 1 GPS and WWV time reference systems for over 16 years for data communications purposes in satellite communications. These...
16515
Peter, 54N 10E
df3lp
Dec 2, 2010 4:48 pm
Hi Thomas, ... Just an idea: Why not using WWVB at 60kHz coming in there from Fort Collins too? http://www.nist.gov/pml/div688/grp40/wwvb.cfm WWVB should be...
16516
Collins, Graham
planophore
Dec 2, 2010 5:21 pm
There have been some good ideas put forth. From Thomas's initial query it sounds like he just needs a reasonably precise audio time stamp for his recording and...
16517
lists_bpf
Dec 2, 2010 7:29 pm
... It is always interesting to think what would be needed to pull off this prank :) I would use a simple I/Q receiver at a remote location, stream the I/Q...
16518
Claudio Re
rec69692001
Dec 2, 2010 9:15 pm
L'ottico alla fine aveva deciso di pagare con bonifico , ma non ci risulta mai fatto . Puoi per favore vedere con la tua diplomazia se ottieni qualcosa ? ...
16519
thb201
Dec 3, 2010 12:14 am
At first I also thought he had done some frequency hopping but when I went back and listened to his recordings he had transmitted only on either 7070 kHz. or...
16520
Facility 406 DM09
kd7jyk
Dec 3, 2010 1:01 am
"Buy a cheap radio controlled clock, break it and look for the receiver chip. It provides a square wave of the am time signal from WWVB to the built-in clock...
16521
Graham
ve3ghm
Dec 3, 2010 2:55 pm
Interesting indeed. I have always had a fascination with the subject of LDE's. I have heard very short echos before. However, this past weekend during the...
16522
Joe Leikhim
rfiemiguy
Dec 3, 2010 5:18 pm
You could loop the playback, back into the same clock that you use to receive, and use the decoder and display -- Joe Leikhim Leikhim and Associates ...
16523
lists_bpf
Dec 3, 2010 7:39 pm
... look at the method i posted earier in this thread. no frequency hopping will foil it, and you can use any modulation you want: cw, hell, ssb, spread...
16524
Facility 406 DM09
kd7jyk
Dec 3, 2010 7:54 pm
Awful lot of theory and BS on fabricating something noted throughout HF for the past seven decades... Amatuer, Military, Broadcasters... It's an echo, that's...
16525
mlangen
mlangenf
Dec 3, 2010 8:33 pm
... sounds like fun! VY 73 Jacek / SQ5BPF It also sounds illegal. 73, Mark -- WA9ETW [Non-text portions of this message have been removed]...
16526
thb201
Dec 4, 2010 3:52 am
Kurt, do you have a part number for these boards? John...
16527
Facility 406 DM09
kd7jyk
Dec 4, 2010 4:27 am
Digikey, look up "time receiver" in their search box. Here is a link to several chips and modules, the price is now around $10 for complete modules with...
