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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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16th Nov 2017, 1:18 pm | #1 |
Dekatron
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Unknown 160m Transmission
A few days ago in the evening, on 160m 1925Khz to be very precise, there was a transmission that was being read both in English and another language.
There was mention of compass degrees which made me think shipping or weather. Readability was not that great I add. Anyone any thoughts? Thank you.
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16th Nov 2017, 1:29 pm | #2 |
Hexode
Join Date: Aug 2010
Location: Malvern, Worcestershire, UK.
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Re: Unknown 160m Transmission
I think that you may have heard Italian coastguard/Marine met report and also other information for seafarers.
They often appear in "our" 160m allocation. Have heard them regularly when QRM permits,HF SDR sites may be a fruitful hunting ground should you wish to hear more. |
16th Nov 2017, 3:14 pm | #3 |
Dekatron
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Re: Unknown 160m Transmission
Thank you for that.
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16th Nov 2017, 4:15 pm | #4 |
Dekatron
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Re: Unknown 160m Transmission
Years ago there were several UK coastal stations sharing the band with us, also a LORAN and a Decca navigation chain. It was a wonder sometimes how we found room for a QSO on Topband.
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16th Nov 2017, 4:58 pm | #5 |
Dekatron
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Re: Unknown 160m Transmission
I remember Loran and "fish phone" from the 1960,s.
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16th Nov 2017, 5:02 pm | #6 |
Octode
Join Date: Jun 2011
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Re: Unknown 160m Transmission
Humber radio - humber radio - humber radio!
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16th Nov 2017, 6:01 pm | #7 |
Dekatron
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Re: Unknown 160m Transmission
Yes!
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16th Nov 2017, 7:06 pm | #8 |
Nonode
Join Date: Nov 2015
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Re: Unknown 160m Transmission
Hasn't been the same since the departure of the diddly-dums...
Who needed calibration scales to kHz divisions.... you instantly knew where you were - by the sound of it. If only the present crud was down at the level of Loran and the DDs |
16th Nov 2017, 9:51 pm | #9 | |
Octode
Join Date: Nov 2013
Location: Penrith, Cumbria, UK
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Re: Unknown 160m Transmission
Quote:
A. |
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16th Nov 2017, 9:55 pm | #10 |
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Re: Unknown 160m Transmission
Just for old times sake, there wouldn't happen to be a recording of Loran's top band 'jingle bells' lurking on youtube or somewhere?
David
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16th Nov 2017, 10:30 pm | #11 |
Dekatron
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Re: Unknown 160m Transmission
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16th Nov 2017, 11:25 pm | #12 |
Hexode
Join Date: Aug 2010
Location: Malvern, Worcestershire, UK.
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Re: Unknown 160m Transmission
Ref post 9
There was LF LORAN,operating in the Khz frequencies,known as LORAN-C Now navigated some way off original topic I think. I remember RAF SAR Sea King navigation fit still retaining Decca Navigator which was turned off but also being fitted for GPS/Satnav in 1990'S. Last encountered in cabin of a Girl friend's Dad's sea going yacht, tried cadging it but he held tightly onto it in case the system be turned back on. Italian CG transmissions heard around 16.00 hrs today on 160m. |
16th Nov 2017, 11:51 pm | #13 | |
Dekatron
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Re: Unknown 160m Transmission
Quote:
Didn't LORAN-A (Skywave LORAN) work around 1.9MHz? There was a LORAN-A station up on the east coast of Scotland at Cruden Bay.
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Regds, Russell W. B. G4YLI. |
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17th Nov 2017, 12:37 am | #14 |
Octode
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Re: Unknown 160m Transmission
It seems there was a Decca system that worked on 1.6 megs, but we were not taught that as it probably didnt feature in the DTp masters and mates syllabus. High accuracy position fixing for stuff like oil rig positioning etc, I guess before the advent of High Accuracy GPS for civilian use.
I can remember taking part in some seismic surveying around a rig in the North Sea whereby a portable decca system that worked via what I think was a microwave link to the rig to get a precise fix relative to the rig position. I'm sure it was explained to me as being a phase difference system like Decca. Certainly a small dish was installed as part of the kit and on the bridge was a VDU that was very like a video game whereby the ship was represented on the screen and had to keep it in a precise location while the boffins let off air charges over the side. Great fun especially for a junior officer like me, getting to play with the "Poscon" Joystick control that wasn't used very often. Sorry very off topic. A. |
17th Nov 2017, 2:12 am | #15 |
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Re: Unknown 160m Transmission
Perhaps Syledis?
David
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17th Nov 2017, 8:59 am | #16 | |
Heptode
Join Date: Feb 2007
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Re: Unknown 160m Transmission
Quote:
I have removed names and callsigns. https://drive.google.com/file/d/1NH_...ew?usp=sharing John |
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17th Nov 2017, 10:03 am | #17 |
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Re: Unknown 160m Transmission
Ah! Thanks, that brings it back!
Topband just doesn't seem the same without it, and QSOs are also a bit thin on the ground. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
18th Nov 2017, 8:30 am | #18 | |
Heptode
Join Date: Jun 2012
Location: Southeast Norfolk, UK.
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Re: Unknown 160m Transmission
Quote:
Or the "Jingle Bells" as it was also known. Actually it was a number of HIFIX radio-navigation chains centred around 1900kHz. They were mainly used for offshore oil work and by RN survey ships. If you'd like to recapture the old sound, try:- https://www.youtube.com/watch?v=iGTkaVbKNJw&t=2s 73 Roger (ex-HIFIX tech, 1969-74) Last edited by G3VKM_Roger; 18th Nov 2017 at 8:40 am. Reason: sp |
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18th Nov 2017, 8:37 am | #19 |
Heptode
Join Date: Jun 2012
Location: Southeast Norfolk, UK.
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Re: Unknown 160m Transmission
SYLEDIS is long-confined to the dustbin, thank goodness for 70cm band operations! It caused untold grief to amateur activities on that band but in the end the QRM it caused to the MOULD systems was it's downfall in the UK.
73, Roger (ex-SYLEDIS tech 1980 to mid 90s when GPS came in and saved the day). |
18th Nov 2017, 9:07 am | #20 | |
Heptode
Join Date: Jun 2012
Location: Southeast Norfolk, UK.
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Re: Unknown 160m Transmission
Quote:
I believe the Loran station was scrapped and the site used for oil-workers accomodation. We chose Sumburgh Head, Fair Isle and Duncasby lighthouses for our chain, they were subject to bad WX outages but the chain ran for a number of years until differential GPS took over. I think the last Top Band system to go was Racal HyperFix and ATUs for that system still turn up, there was one in a recent VMARS auction, IIRC. 73 Roger |
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