[UK-CONTEST] Amazing echos during CQ WW

[Mark (G4PCS)]

I don't know if someone can check this: I tried to measure the echo's 
delay and make it around 0.3264s. That equates to a distance of about 
98000km - allowing for errors that probably means a double-round trip?

I'm
 not sure how much delay would be expected within the receiver itself 
(the EI7M audio is from monitor out), so the calculation might be way 
out - but I suspect it's a lot further than backscatter ;)

73, Mark EI3KD at EI7M




>________________________________
> From: "Andy Cook, G4PIQ" <g4piq at btinternet.com>
>To: "'Uk-Contest at Contesting. Com'" <uk-contest at contesting.com> 
>Sent: Tuesday, 30 October 2012, 10:13
>Subject: Re: [UK-CONTEST] Amazing echos during CQ WW
> 
>It is a great effect isn't it. I've always assumed that this was sometimes
>backscatter rather than a full round-the-world trip, but I expect that we
>see both kinds. I wasn't active at a 'real' station this year, but I've
>certainly heard them as loud as on your recording in the past. A great
>direction for this was always to the south-west in the morning on 15m.
>
>On Friday night, I dropped into G0KPW to help Steve, G0AEV get the station
>setup as M6T for a 10m single-band effort. I was surprised to hear
>backscatter echoes as I went back to receive at 1930 local, peaking with the
>antenna beaming about 280 degrees. I wouldn't have expected a
>round-the-world path at that time of day.
>
>73,
>
>Andy, G4PIQ
>
>-----Original Message-----
>From: UK-Contest [mailto:uk-contest-bounces at contesting.com] On Behalf Of
>Pete Lindsay
>Sent: 29 October 2012 13:13
>To: Uk-Contest at Contesting. Com
>Subject: [UK-CONTEST] Amazing echos during CQ WW
>
>We were once again blessed with great conditions during CQ WW, full
>report from this year's M/S effort at EI7M to follow (headline = over
>9,000 QSOs!).
>On many occasions on 20, 15 and 10 we were hearing our own signals
>when going over to receive, having travelled around the world. It
>seemed much stronger and more pronounced than I have heard before,
>anyone else notice that?
>
>Here is a sample recording on 10m for those who haven't heard the effect.
>You'll hear me from the monitor on the FT1000 during transmit, then me
>again (peaking S9+) when I go over to receive.
>
>http://web.plcg.org/echo.mp3
>
>
>Pete, G4CLA.
>_______________________________________________
>UK-Contest mailing list
>UK-Contest at contesting.com
>http://lists.contesting.com/mailman/listinfo/uk-contest
>
>
>-----
>No virus found in this message.
>Checked by AVG - www.avg.com
>Version: 2012.0.2221 / Virus Database: 2441/5361 - Release Date: 10/29/12
>
>_______________________________________________
>UK-Contest mailing list
>UK-Contest at contesting.com
>http://lists.contesting.com/mailman/listinfo/uk-contest
>
>
>