Around here there seems to be a problem with cross mod on some medium wave radios. You get Premier radio in the background. So where are these transmitters located near London?
Also FM has issues with Radio Jacky or however its spelled anywhere near Tolworth. In parts of Italy I read residents are worried about the output power of Vatican radio and if it might cause health issues. That station is apparently putting out megawatts on around 4 mhz.
Brian
None of which were long wave. They were all shortwave providing service overseas.
Peter Crosland
Premier radio has five transmitters near you, including five hundred watts on 1413 Kilohertz near Heathrow, and the same on 1305 at North Looe. There's also a kilowatt at Bow on 1332, directed slightly to the West to cover the centre of London.
Radio Jackie has a hundred watts at 107.8 Megahertz on top of Tolworth Tower, which gives a very good radiation pattern. As an ex-pirate, they may wind up the power a bit and modulate to the limits of their gear.
Droitwich used to be good for the locals who, with the help of a suitably tuned coil of wire, could power their porch lights!
mike
Over deviation is of no use to an fm station, it just sounds awful as well. I can understand their annoyance at pirates though, we get a lot of those around here. I had no idea Premier had so many outlets, Must be money in God on air I never realised. I can only listen to them for a few seconds before my blood boils at the claptrap and naivety of it all. Brian
I somehow doubt that is really feasible. I recall when I was 11, in 1961 that bbc had an open day at Brookmans Park and in those days it was all glass plumbing and glowing valves. We tried to get some light from a tuned circuit in the car park and failed completely. I bet its not as interesting over there now, its probably all in a few cabinets. Mind you todays health and safety would have had a heart atack at us all waving neons with coils attached near valves with just a piece of ribbon in between! Brian
In article , Brian Gaff writes
Well some of us remember transmitter theory practical demos at Evesham using a big aluminium ground plane and lightbulbs, with bits of wire attached as 1/4 wave and 1/2 wave dipoles. That was all at UHF, IIRC. and they most certainly lit up then.
I've seen a torch bulb light up when connected across the centre terminals of a 27MHz CB dipole. The transmission was from three houses away and was very high powered.
Bill
FWIW, I've set off burglar alarms and can crash the engine management of a Sierra running a few (25) watts @ 144MHz.
Umm ... Are there any Sierra's left around?...
Boots in Bridport twenty-odd years ago was always good for a bit of drive-by 'alarm-baiting' on 2m. Not me, you understand - I was just the passenger...
I remember the miniature scaled-down demonstration aerial arrays at BBC ETD - round the back of one of the top huts. I also remember hearing about the Rover full of BBC hierarchy visiting Wenvoe, and having to get out and push the car away from the antenna field down the drive when it wouldn't start. I heard the Droitwich pick-up loop story many times, but not seen it personally. Considering there was enough RF to light two 240V lamps to full brilliancy connected between the earths of both 200kW LF transmitters, I can well believe the tale, although I suspect it has been embellished occasionally.
I once chased some sheep out of the cooling ponds and found the fence-hole where they had got through. Once shot of them, I grabbed both sides of the fence to pull it together. 'Ouch! By Jingo! I say, that jolly well hurt!' I didn't say...
I didn't say when this was.
But as it happens, this one still is. It's a 1987 RS Cosworth. Rather wish I hadn't sold it, now.
In message , Brian Gaff writes
I wonder if the Vatican have ever wondered if it provides effective birth control?
Back in the 60s, when I used to operate from my car on AM, using 10W on
160m (1.8MHz), I was able to strike a fluorescent tube if I held it close to the top (high voltage) end of the 8" centre-loaded whip aerial. I could then walk about 6' away before went out.
In the control rooms in Television Centre it used to be possible to get quite a bright flicker from a fluorescent tube by pressing one end against the perforated metal wall cladding, holding onto the other end, and scuffing your shoes on the carpet.
Rod.
No ... Bill's crashed them all ...
(Sorry, it had to be said ...)
[] We once had a talk at CARS by someone from the VLF transmitters (at Rugby, I think). He told us that:
We had that at a much lower power site. BT man came to do some checks for an ISDN line. He came several times and nothing seemed to be happening so asked him what the problem was and it was his test equipment being affected by the RF though of course he did not realise what it was. We him lent our audio test set and he was able to check the line with that OK.
Yet another Kent graduate on uk.d-i-y....this group is seriously skewed...
In message , Bob Eager writes: []
(Apologies to others - I'd have emailed, but I guessed that "news0001" might not be a valid address.)
Hi - blast from the past indeed!
I am here via uk.tech.broadcast; I'm not sure when DIY got added to the thread (or why!).
(I'm back not too far from UKC - I now work in Rochester and live in Charing "near" Ashford.)
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