Comments by "Mike H" (@Mike-H_UK) on "Ringway Manchester" channel.

  1. I hear a signal that sounds like the brrr, brrr, brrr, brrr of a petrol lawnmower. It's strongest on a Sunday afternoon in summer, and it's sometimes audible in the early evenings as well. I never hear it in winter. You can pick it up on all bands.
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  2. Another well researched and interesting video, Lewis.
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  3. Lewis, you're drone lives dangerously being in such close proximity to all that RF. But you know that, so I assume it is a calculated risk!! Thanks for pulling this together, I know it's a lot of work, but it is very interesting.
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  4. Wow, another great video! I am impressed that the trough has been on the mast since 1969 and has survived 50+ years of environmental abuse at that altitude! Quick question for suitably minded people.... I notice that some of the microwave dishes are contained within a drum shaped housing (not really a radome). Others are contained within a more conical arrangement. Is there a reason for choosing one over the other? All I can think is that the drum provides easier coverage of a horn type assembly at the cost of increased wind loading. The conical arrangement perhaps needs a simpler feed arrangement buts more aerodynamic with lower wind loading. Is this thinking in the right direction or is there a totally different explanation?
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  5. Welcome back! I was beginning to miss your videos... Another great short film, many thanks.
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  6. I'm surprised that the three helical antennas (log periodic?) for countermeasures are not enclosed in a radome because it is easy to identify what frequency range they are targeting from their dimensions. Perhaps they are not expecting most illegal operators to modify the drone's communication system to try and defeat them... UPDATE - they probably don't need to hide the inhibitor frequencies because they are well known and publicised: 433MHz, 915MHz, 2.4GHz, 5.8GHz and GNSS.
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  7. Andy, I hate to say this, but I don't think he loves you......
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  8.  @gingermongoose100  Yes please!
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  9. Doesn't everyone alive on the planet fit this bill?
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  10. You're right - I've never heard of this before. Thanks for the video.
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  11. Yes please - more footage on the Trafford Park Railway.
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  12. When I was a kid, one of our neighbours has a dodgy TV that broadcast the sound of the programme they were watching onto the bottom of the FM band. It was fun listening to what they were watching, although I think the main programme they watched was Emmerdale Farm as it was called in those days.
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  13. Great video, but you forgot to 'add the link to the description below...'
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  14. I'm very happy for Lewis to review stuff that is outside my price range in order to provide me a higher level of awareness. On a similar note, I'm happy for him to review number stations when I don't intend to set up one of these either. 🙂Seven, three, oblique...
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  15. That's what I thought!!!
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  16. Looking forward to the FRD-10 video. I was aware that there were differences between the AN/FDR-10 and AN/FLR-9 but had never got around to investigating the details.
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  17. Sounds like the material for series 2...... :-)
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  18. Another great video Lewis. These really are extremely high quality productions.
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  19. Great video & very interesting. Was it just me, or did other people have a lot more adverts interrupting the video than usual?
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  20. Very good video - as is usual. Do you actually have any of these transmitters yourself, or did you only manage to get the photos? I'm just wondering whether they are more 'openly' available these days....
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  21. I think it's mutual and historical. Mr Macron is certainly a good example.....
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  22. I concluded that there is much more to this circuit than a simple audio blanker when I saw that both SO239 and phono sockets were on the back. Why are the RF sockets needed for a pure audio blanker? I think the problem with 'only' an audio blanker is that the RF front-end will overload , produce intermodulation distortion and create a period of poor reception in the radio for a number of milliseconds as the AGC recovers. So I strongly suspect that this box is a two stage solution that blanks (gates out) the strong pulses from the RF by using a threshold comparator to create a dead zone in the RF and a final 'mopping up' stage in the AF. This slightly more complicated approach explains the larger number of components than a single audio notch filter and also the requirement of an external power supply.and the SO239 sockets. After the time that the Datong product was developed, single-chip, two-stage blanker solutions came out, for example the Allegro Microsystems 3845.
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  23. Great video - very informative. Many thanks Lewis and Uncle K. I was wondering if Killer may have taken the transmitter that Aquarius lost on the hill, but suspect that this would have been way before his time.
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  24. Did it work on the girl?
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  25. Are you saying that he is not Roger?
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  26.  @MaxStax1  That's often the case. I have a number of patents from various companies. The patents are in my name, but the company that paid for the work owns the IP.
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  27. Cheers Lewis. It's good to see that other people have as much old electronics as I do!!!!! By the way, what was the reason for the solar panels own the van roof? And don't say it was an electric vehicle that propels itself on a sunny day....
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  28. Great mini-series Lewis. I'm almost sad that it has finished.
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  29. Merry Christmas Lewis. 🙂
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  30. Que?
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  31.  @RingwayManchester  Yes. And then a separate phone call between Charles and Camilla was recorded and made public very shortly afterwards. The coincidence is too great. At the time I thought (and still do) that there was more to this than we knew.
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  32. Yep, I find these transmitter videos interesting and would like more of them. Thanks for producing them.
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  33. Thats only for QRP and children. I want the megawatt handheld ;-)
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  34. Great video Lewis. You've done some great background work making these videos very informative and also addictive. It reminds ne of the old joke: "how do you keep an idiot in suspense?" "I'll tell you tomorrow!"
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  35. Cheers Lewis - another great video. Back in the day I had a 2 channel, 200mW Amstrad handheld transceiver, but we lived on a hill so I could nearly always receive something and often find someone who could also hear me!
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  36. Did you try flying your drone over the site? Or is in an exclusion area?
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  37.  @PlutoTheGod  Probably not radio itself, but everything moves forward (crystal sets, vacuum tube (valve) radios, etc).
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  38. Great stuff Lewis and Andy. Looking forward to part 3 when I expect Inspector Morse will be on secondment from Oxford.
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  39. Maybe because if the jamming signal is available as a clean source from the regular transmitter (without being superposed on the signal that it is jamming), then it is possible to scale it, delay it, and subtract from the signal being jammed to provide a clean copy of the original signal. That's one reason why white noise is a good choice of modulation for jamming because is has no discernable artefacts that can be filtered out or subtracted away.
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  40. Are you the same Andy Howlett with whom I've discussed antenna comparisons and measurements on SDRplay groups? If so, small world!
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  41. Great couple of videos Lewis. I'm guessing that this activity is completely separate from the Aquarius and Andromeda guys who were also active in the 1970s and early 80s in the Manchester area.
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  42.  @sunnysidegardeners7163  and incompetence.
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  43.  @RingwayManchester  Oh, I thought they were saying that the monitoring was MI6 rather than MI5 (or vice versa). MI5 and MI6 apparently refer to each other as 'neighbours'. I took it that the reply was a friendly way of letting Martin know that he was still being monitored (how else would they know it was him) and a reminder to continue 'behaving' himself. Maybe I've read too much Ben Mcintyre......?
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  44. Another excellent video, Lewis! Many thanks! Maybe an interesting future topic would be the move to VHF/FM transmissions in the UK following the end of the second major world disagreement. There was a lot of interesting technical R&D involved.
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  45.  @richiehoyt8487  A handwritten letter is a good way of checking someone's basic literacy, command of the English language and breadth of vocabulary. Also, since it takes a while to write a good letter, it helps weed out the non-serious, speculative applicants.
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  46. Chain home operated on 22-50MHz so no magnetrons were involved in the demise of these gulls!
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  47. Great video Lewis! I'm surprised that the missus doesn't kick up a fuss when you start photographing masts when on holiday; I know that I would have a hard time. Anyway, this is a great technical video and a fine reply to Andy Kirby's intro featuring the Steelyard/Duga OTHR. Andy will now need to up his game (which I'm sure he will do....)
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  48. Or Jimmy Savile on R2. Now then, now then, now then......
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  49. Great update. Now back to Meshtastic!
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  50. Very interesting. Many thanks for bringing this to our attention!
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