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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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8th Feb 2020, 12:27 am | #21 |
Nonode
Join Date: Sep 2017
Location: Stockport, Cheshire, UK.
Posts: 2,002
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Re: Morse audible over Radio 4 LW last night
I pass that way going to and from my Sister in Law's house.
It sounds like something from a John Le Carre novel, which often feature outposts of the secret service in inconspicuous premises.
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11th Feb 2020, 7:05 pm | #22 | |
Tetrode
Join Date: Sep 2010
Location: Tyne Valley, Northumberland
Posts: 79
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Re: Morse audible over Radio 4 LW last night
Quote:
My mum used to do wireless intercepts in cw around 1941 to the end of WW2 hostilities and during the period of her service she also sent hand written intercept messages down the line, typing thousands of them on a teleprinter. She never knew what it was all about. Said it was all just groups of characters. They worked long shifts around the clock and everything was on a need to know basis, and she didn't need to know. I now believe she was a small cog in the wheel that we all know was about Bletchley Park and passing information to the boffins there for decrypting. She died without ever really knowing anything about the several years of work she did. |
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28th Feb 2020, 10:13 pm | #23 | |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,846
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Re: Morse audible over Radio 4 LW last night
Quote:
Recorded evening of 10th Feb 2020, from my DAC90A on Radio 4 LW, during this programme: https://www.bbc.co.uk/programmes/m000dy4y Any ideas please? I'm fascinated. Nick. Last edited by Nickthedentist; 28th Feb 2020 at 10:22 pm. |
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28th Feb 2020, 10:30 pm | #24 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Morse audible over Radio 4 LW last night
The first clip appears to be a G3 call sign, my Morse is very poor after not using it for many years so I will not post the 3 letters in case I am wrong.
Edit. Third clip appears to be the same call sign, Oxford location.
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Frank Last edited by Nuvistor; 28th Feb 2020 at 10:40 pm. |
28th Feb 2020, 10:42 pm | #25 |
Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,219
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Re: Morse audible over Radio 4 LW last night
The call sign is G3XGC. Google indicates he is in North Oxford, so possibly very near to you.
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28th Feb 2020, 11:23 pm | #26 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Morse audible over Radio 4 LW last night
I doubt that the G3 is transmitting an out of band signal, more likely either external mixing, a receiver problem or design deficiencies.
You could try a trap tuned to the 160m band before the mixer.
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29th Feb 2020, 5:14 am | #27 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Re: Morse audible over Radio 4 LW last night
I notice that in the Radio Officer's magazine web page linked to, it's described as a 'Notorious area of Manchester'!
David
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29th Feb 2020, 8:02 am | #28 |
Octode
Join Date: Mar 2006
Location: Bracknell, Berkshire,UK.
Posts: 1,172
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Re: Morse audible over Radio 4 LW last night
You can see G3XGCs details on qrz.com (but you need to log in to see the full details). He is a keen 160m dxer and in the clip I could hear he is clearly calling some dx station in a pile up. Image/intermod product in your radio from a strong local station.
73 Dave G3YMC |
29th Feb 2020, 11:29 am | #29 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: Morse audible over Radio 4 LW last night
I'll stick with Post #8 theory.
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29th Feb 2020, 11:58 am | #30 |
Heptode
Join Date: Apr 2009
Location: Scratby, Norfolk, UK.
Posts: 650
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Re: Morse audible over Radio 4 LW last night
Hi,
And he does have an enviable antenna system! Kind regards Dave |
29th Feb 2020, 12:18 pm | #31 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,846
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Re: Morse audible over Radio 4 LW last night
Wow, well done everyone, I'm incredibly impressed. Thanks to all who have contributed.
The chap lives a mile or so from me at most. I will drop him a line and point him to this thread. Cheers, Nick. |
29th Feb 2020, 12:39 pm | #32 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,947
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Re: Morse audible over Radio 4 LW last night
You may be able to null him out by repositioning the radio. He's very close to you at the north end of Summertown though, and if you null him you may find you're nulling R4 too.
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29th Feb 2020, 1:11 pm | #33 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,846
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Re: Morse audible over Radio 4 LW last night
It's not a problem really. It's only happened a handful of times and doesn't last very long. It made a dullish programme a bit more interesting!
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29th Feb 2020, 2:27 pm | #34 |
Octode
Join Date: Mar 2006
Location: Bracknell, Berkshire,UK.
Posts: 1,172
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Re: Morse audible over Radio 4 LW last night
That seems right, but I suspect the IF is a little higher. Most dx calling in Europe would be around 1825kHz - definitely not on 1806kHz as that is outside our band which only starts at 1810. But yes, second harmonic of the mixing frequency causing a beat note ith Droitwich.
Note that recordings 2 and 3 show a very high pitched beat note which I couldn't even hear earlier when I didn't have my hearing aids in. You should add a 5kHz or so correction to the calculations for that as well. You don't need high power to cause such effects, even weak signals will do it if the front end filtering of the receiver is low. Dave |
1st Mar 2020, 10:58 am | #35 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: Morse audible over Radio 4 LW last night
I agree it seems odd that the IF needs to be so high for the calculations to "come out" inside top band. Maybe some degree of mistuning does explain it as the LO harmonic is moving twice as fast.
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1st Mar 2020, 12:41 pm | #36 |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,846
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Re: Morse audible over Radio 4 LW last night
I must say that the DAC90A has been restored by me. It has not had the alignment altered since built, but nor have I checked it. It performs very well indeed so I used the "if it ain't broke" principle and left well alone.
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1st Mar 2020, 9:42 pm | #37 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: Morse audible over Radio 4 LW last night
Well that is fair enough - it works so what does it matter?
This thread has been well worth while. Maybe you will make a new friend. I certainly hope so. I remember knocking on a door in such circumstances. It set me on a path and I owe them so much. G8BI, G3CSE and one other I wish could remember. |
2nd Mar 2020, 12:28 am | #38 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,715
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Re: Morse audible over Radio 4 LW last night
Eric G3UKZ and Jim G2DBV, (SKs)
100 and 150 yards respectively away from my house, and first heard as a image reception on my 6 transistor pocket radio, engaged in their regular Sunday morning QSO.
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2nd Mar 2020, 11:28 am | #39 |
Nonode
Join Date: Jan 2004
Location: 1966-1976 Coverack in Cornwall and Helston Cornwall. 1976-present Bristol/Bath area.
Posts: 2,965
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Re: Morse audible over Radio 4 LW last night
Last week I was listening to the midnight news on R4 LW 198 the Droitwich transmitter was cutting in and out for about an hour. I suspect it was power supply problems due to the weather conditions. When the transmitter was on I noticed just on one of my radios, a small Philips portable, that I could hear a weak background telemetry carrier.
Since the transmitter has been back on this telemetry carrier has disappeared. I suspect I was hearing the telemetry control carrier used for remotely switching the transmitter. It was strange that only one radio was responding to this telemetry carrier.
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13th Mar 2020, 12:58 pm | #40 |
Pentode
Join Date: Dec 2015
Location: Abingdon on Thames, Oxon, UK.
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Re: Morse audible over Radio 4 LW last night
Nick,
Did you contact Geoff, G3XGC? He used to be a member of the Oxford club and is a specialist in "top band" CW DX. Ken M1SLH |