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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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1st Aug 2018, 10:44 am | #21 |
Pentode
Join Date: Sep 2014
Location: Bedford, Bedfordshire, UK.
Posts: 174
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Re: R107 army receiver
I actually used my complete R107 as a tunable IF with a crystal controlled converter I built in front of it to give me coverage of at least the 15M band. Worked very well but of course there were sun spots in those days and I remember working lots of American novice licenses, WN.... etc who seemed to frequent the band.
Now, where is that old logbook? Ian |
1st Aug 2018, 11:07 am | #22 |
Dekatron
Join Date: Jan 2006
Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex.
Posts: 5,817
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Re: R107 army receiver
Yes that was very common Ian wasn't it! I can see that the tuneable IF would have been a good combination of sensitivity combined with the [already mentioned] surprisingly good selectivity on the R107. I'm still trying to work out what I thought I was going to do with the 465K IF [653 metres]. Perhaps I thought the MW Band could be stretched a bit beyond 600? I think I'm getting mixed up somewhere but I do remember [vividly] my disappointment at not being able to buy that "Front End".
Dave |
1st Aug 2018, 2:02 pm | #23 |
Heptode
Join Date: Oct 2015
Location: Gloucestershire, UK.
Posts: 720
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Re: R107 army receiver
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1st Aug 2018, 2:34 pm | #24 |
Pentode
Join Date: Mar 2013
Location: Leeds, West Yorkshire, UK.
Posts: 246
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Re: R107 army receiver
Had 2 dry joints on one i worked on ("band- width" switch and ?cant remember!)NOTE Invert the vibrator ( or take out) on mains operation, and beware high voltage is present on the "3 pronged" plug
info..http://www.radiomuseum.co.uk/r107.html regards S-W |
1st Aug 2018, 2:52 pm | #25 |
Octode
Join Date: Jun 2006
Location: St Osyth, Nr Clacton, Essex, UK.
Posts: 1,482
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Re: R107 army receiver
I used mine in the late '60s with an RF24 ahead of it. VQ4RF on 15m SSB was a station I heard often.
Graham
__________________
Half my stuff is junk - trouble is, I don't know which half! |
1st Aug 2018, 3:11 pm | #26 | |
Guest
Posts: n/a
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Re: R107 army receiver
Quote:
Imagine... (wavy lines across film) A cold winters day in the workshop, radio warming it up with the Home Service on, can't get much better. |
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16th Aug 2018, 7:03 pm | #27 |
Pentode
Join Date: May 2010
Location: Wick, Scotland, UK.
Posts: 227
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Re: R107 army receiver
I have two of these R107 radios in my shed if anyone is interested is restoration?
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17th Aug 2018, 11:15 am | #28 |
Tetrode
Join Date: Dec 2014
Location: Pembrokeshire, Wales, UK.
Posts: 68
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Re: R107 army receiver
As a fan of Eddystone Elegance I'm afraid I look at all that steel work on the R107 in horror. Real heavy engineering. Still, best of luck to all with their restoration labours. It's a creditable aim to keep all vintage equipment going for as long as possible.
Ref photographs in G4XWDJim's note of 31st July: I note that four of the bottles are laid horizontally. Not all that uncommon I suppose but a question occurs to me. My belief has always been that valves are designed to operate and dissipate their heat vertically. Sorry if it's a daft question, but is there any potential downside to operating valves in this way? regards, pete. |
17th Aug 2018, 11:54 am | #29 |
Nonode
Join Date: May 2007
Location: Preston, Lancashire, UK.
Posts: 2,511
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Re: R107 army receiver
Valve manufacturer's data sheets usually give guidance on the mounting orientation, I understand only a minority aren't happy in any orientation. Probably high-power devices, or concern that a long filament can sag when hot. Mercury-vapour rectifiers can be sensitive, I know the data sheet for the type 83 says it must be mounted vertically, but it works quite happily horizontal in the I-177b valve tester!
Andy |
17th Aug 2018, 12:22 pm | #30 |
Octode
Join Date: Oct 2008
Location: Littlehampton, West Sussex, UK.
Posts: 1,465
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Re: R107 army receiver
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17th Aug 2018, 6:59 pm | #31 |
Tetrode
Join Date: Dec 2014
Location: Pembrokeshire, Wales, UK.
Posts: 68
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Re: R107 army receiver
Oops!!! Tks Jim. Note to self: open eyes before mouth. pete
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