[Laser] Laser Digest, Vol 78, Issue 1
Sam Jewell
jewell at btinternet.com
Mon Apr 4 12:45:13 EDT 2011
Well done guys.
I'll include a mention in the next Radcom Column I submit.
Sam, G4DDK
Sent tomorrow from my time machine
On 4 Apr 2011, at 17:01, laser-request at mailman.qth.net wrote:
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> Today's Topics:
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> 1. New UK optical communication distance record. (I)
> 2. Re: New UK optical communication distance record. (Jim Moss)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 04 Apr 2011 05:50:50 -0400
> From: I <stuart.wisher at talktalk.net>
> Subject: [Laser] New UK optical communication distance record.
> To: laser at mailman.qth.net
> Message-ID: <8CDC0C4E9D6BC02-B14-20D0 at FRR2-L18./f>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
>
>
>
> Yesterday, Sunday April 3rd 2011 saw a new distance record set for Optical Communication in the UK by a group of Radio Amateurs from North-East England. The distance worked was just a few metres short of 90km, signals were exchanged on FM and SSB at remarkable strengths.
>
>
> The contact was made from Race Head IO94VS, west of Stanhope in County Durham, to Danby Moor IO84NK near Whitby. The team at Race Head included two stations, Stuart G8CYW running the transverter and LED transceiver of his design featured in recent articles in Radcom, and Brian, G8KPD also running his version of the designs, plus separate receive and transmit heads. The two stations were located about 5m apart. Also present were Nick G4KUX and Peter, G8POG who provided welcome support. Particular note must be made of the station on Danby Moor, operated by Rob, M0DTS who single handed, operated his version of the transverter featured in Stuart's articles, the 70cm talkback gear, contact through the local 70cm repeater to interested parties, and if that was not enough, set up his Amateur TV station and streamed live video (and audio) of the event through GB3KM, the local TV repeater and out onto the web!
>
>
> Operations began as the sun went down, with Robs signal being seen through Nick's telescope in almost daylight conditions. A little later Rob spotted Stuart's 20W LED beacon flashing at 2.5Hz as soon as it was switched on. The beacon was then switched to 20kHz and Rob tuned this in as a carrier on his hf rig, and alignment was optimised. Judging by the loudness of the tone coming back on the 70cm link from him he had no trouble in locating us. Stuart then switched to the LED transceiver and worked Rob on FM which was fully quieting both ways, end-stopping Stuart's FT817 driving the transverter. SSB was tried next which was S9+ 30dB with a remarkable peak at 60 over as reported by Rob. This contact was immediately followed by contacts between Rob and Brian on his station, testing both his LED transceiver and his separate heads at similar strengths to Stuart's results.
>
>
> This all worked so well that no-one wanted it to stop, and we chatted on over the link for over an hour. At one stage we were effectively operating a spatial diversity receive set-up as Robs optical signal could be hear booming out of both Brian's and Stuart's rigs just a few meters apart, but ten million wavelengths apart in light terms. It is obvious to us that this system is capable of much greater distance than the nominal 90km path we were able to find here in the UK.
>
>
> Stuart, G8CYW
>
>
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 4 Apr 2011 07:25:58 -0700 (PDT)
> From: Jim Moss <n9jim-6 at pacbell.net>
> Subject: Re: [Laser] New UK optical communication distance record.
> To: Free Space LASER Communications <laser at mailman.qth.net>
> Message-ID: <54285.41049.qm at web81105.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
>
>
>
> Well done!
>
> If there is a link to the video please let us know!
>
> Jim
> N9JIM
>
>
> ----- Original Message ----
> From: I <stuart.wisher at talktalk.net>
> To: laser at mailman.qth.net
> Sent: Mon, April 4, 2011 2:50:50 AM
> Subject: [Laser] New UK optical communication distance record.
>
>
>
>
>
>
> Yesterday, Sunday April 3rd 2011 saw a new distance record set for Optical
> Communication in the UK by a group of Radio Amateurs from North-East England.
> The distance worked was just a few metres short of 90km, signals were exchanged
> on FM and SSB at remarkable strengths.
>
>
> The contact was made from Race Head IO94VS, west of Stanhope in County Durham,
> to Danby Moor IO84NK near Whitby. The team at Race Head included two stations,
> Stuart G8CYW running the transverter and LED transceiver of his design featured
> in recent articles in Radcom, and Brian, G8KPD also running his version of the
> designs, plus separate receive and transmit heads. The two stations were located
> about 5m apart. Also present were Nick G4KUX and Peter, G8POG who provided
> welcome support. Particular note must be made of the station on Danby Moor,
> operated by Rob, M0DTS who single handed, operated his version of the
> transverter featured in Stuart's articles, the 70cm talkback gear, contact
> through the local 70cm repeater to interested parties, and if that was not
> enough, set up his Amateur TV station and streamed live video (and audio) of the
> event through GB3KM, the local TV repeater and out onto the web!
>
>
> Operations began as the sun went down, with Robs signal being seen through
> Nick's telescope in almost daylight conditions. A little later Rob spotted
> Stuart's 20W LED beacon flashing at 2.5Hz as soon as it was switched on. The
> beacon was then switched to 20kHz and Rob tuned this in as a carrier on his hf
> rig, and alignment was optimised. Judging by the loudness of the tone coming
> back on the 70cm link from him he had no trouble in locating us. Stuart then
> switched to the LED transceiver and worked Rob on FM which was fully quieting
> both ways, end-stopping Stuart's FT817 driving the transverter. SSB was tried
> next which was S9+ 30dB with a remarkable peak at 60 over as reported by Rob.
> This contact was immediately followed by contacts between Rob and Brian on his
> station, testing both his LED transceiver and his separate heads at similar
> strengths to Stuart's results.
>
>
> This all worked so well that no-one wanted it to stop, and we chatted on over
> the link for over an hour. At one stage we were effectively operating a spatial
> diversity receive set-up as Robs optical signal could be hear booming out of
> both Brian's and Stuart's rigs just a few meters apart, but ten million
> wavelengths apart in light terms. It is obvious to us that this system is
> capable of much greater distance than the nominal 90km path we were able to find
> here in the UK.
>
>
> Stuart, G8CYW
>
>
>
>
>
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> End of Laser Digest, Vol 78, Issue 1
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