fv1609 Posted February 20, 2013 Author Share Posted February 20, 2013 Sorry, seriously though, does it involve rotation of an object? Nope not really but there are bearings but I can see no reason for it to rotate nor can I see how it would rotate and I have the 26 page description in front of me! and no it wasn't a tin opener. Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 20, 2013 Author Share Posted February 20, 2013 Scale is a problem here, I don't think it's particularly large (despite the apparent construction from bolted metal strip). The chunk in the middle is a centre-tapped airspaced coil for radio frequencies, but I don't see what the 4 cylindrical units are for as there's no apparent connection to the coil. I'd say it's an RF tank circuit, either for a transmitter, or some sort of medical/vetinary diathermy unit. Chris. Yes well done Chris you've got it as far as anyone could. It is actually a crucial part of a bridge circuit to try to tame instability in high power HF transmitters. Can anyone guess the appx year? What is the connection with the last mystery object? Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 20, 2013 Author Share Posted February 20, 2013 I think I agree with Chris S. that it is electrical - certainly the two metal contacts at the top lead to that idea and it looks to be a 4 turn coil too short to be an electro-magnet. Are the (metal?) bars horizontally just there for strength ? It looks like it was designed for large currents and I do seem to remember a previous MO was an underwater transmitting antenna - I wonder if this is another part of that radio system ? Iain The rods are on bearings (quite why is not made clear) There must have been high current the power unit gave 20 kW. The structure so designed so it detuned by minimal amounts at changes of 40 deg C that were described as "Beyond audibility" Well remembered but this was not the underwater system this was for battleships of a later period. So this is connected to that mystery object and the last one. Quote Link to comment Share on other sites More sharing options...
Rick W Posted February 20, 2013 Share Posted February 20, 2013 Connection with last object, was it for use in the tropics? Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 20, 2013 Author Share Posted February 20, 2013 Connection with last object, was it for use in the tropics? Nope it was the location. There were some pictures with the last MO during the FVRDE trials. Quote Link to comment Share on other sites More sharing options...
Chris Suslowicz Posted February 20, 2013 Share Posted February 20, 2013 The rods are on bearings (quite why is not made clear) There must have been high current the power unit gave 20 kW. The structure so designed so it detuned by minimal amounts at changes of 40 deg C that were described as "Beyond audibility" Well remembered but this was not the underwater system this was for battleships of a later period. So this is connected to that mystery object and the last one. Oh, if it's Naval that explains much. 20kW puts it out of reach of any army sets (apart from the modern fixed-installation kit for round the world use). Guesswork for date: 1923, for a CW set. Chris. Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 20, 2013 Author Share Posted February 20, 2013 Oh, if it's Naval that explains much. 20kW puts it out of reach of any army sets (apart from the modern fixed-installation kit for round the world use). Guesswork for date: 1923, for a CW set. Chris. Yes Chris it was quite hairy stuff. It was actually 1932, quite a complex research paper trying to combat instability in transmitters operating between, 1,000 and 20,000 kc/s (No disrespect to Herr Hertz but I like the original terminology ie it means just what it says) Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 21, 2013 Author Share Posted February 21, 2013 There is actually a connection with previous object although it would take a very clever person to work that out :-D No volunteers then. The answer is the location. The wireless experiments were conducted in 1932 at HM Signal School, Horsea Island, Portsmouth. The FVRDE amphibious trials in 1964 for the FMC Command & Reconnaissance Vehicle where not conducted at ATTURM Instow as one might have expected, but at Horsea Island. Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 22, 2013 Author Share Posted February 22, 2013 For those with an interest in RF here are a few key pages. Note the various ways of constructing the coil & the results obtained. Quote Link to comment Share on other sites More sharing options...
gritineye Posted February 22, 2013 Share Posted February 22, 2013 Hmmmm, just checking this latest info out.... Nope..sorry, still don't quite get it Clive. Oops must have left the web cam on... Quote Link to comment Share on other sites More sharing options...
fv1609 Posted February 22, 2013 Author Share Posted February 22, 2013 Oh Bernard please do try to keep up with the rest of the class. Well does this explain it any better? Quote Link to comment Share on other sites More sharing options...
gritineye Posted February 22, 2013 Share Posted February 22, 2013 Yep, got it now, no wonder I couldn't keep up, that bears the signature of a three toed sloth, way too quick for me! Quote Link to comment Share on other sites More sharing options...
Degsy Posted February 22, 2013 Share Posted February 22, 2013 Errrrr......no. I can't keep up either, must be an age thing.:confused: Quote Link to comment Share on other sites More sharing options...
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