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Everything posted by g0ozs

  1. Ken is about 20 miles SE of me near the coast - I know him well ! 73 de G0OZS
  2. Clive I wont make it there this year - if you do see Mike Buckley and his friends that used to operate a large HF station near the main road please pass on my regards Iain 73 de G0OZS
  3. Peter What was originally fitted in late 1950s / early 1960s as new build probably R-113 VHF (http://www.greenradio.de/e_r113.htm) or if early R-111 (https://www.radiomuseum.org/r/b_8865_r_111r11p_11.html) - Command tanks may also have had R-112 HF https://www.radiomuseum.org/r/b_8865_r_112r11p_11.html. If modernised in later years after mid 1960s quite likely R-123 (P-123 in Cyrillic) became nearly universal as a late cold war Soviet/Warsaw Pact VHF tank and APC set. The R-123 was around by the early 1970s and even has a (US) manual for use of captured kit see: http://radionerds.com/images/c/ce/R-123M_User_Manual_English.pdf I have one from Poland and it works surprisingly well to this day !
  4. The form of whip based on the 5.4m mast that I have come across has a metal adapter that fits in the top of the upper fibreglass tube to hold as many as 3 or 4 normal 1m vehicle whip sections at the top of the mast, and a wire connected to the adapter, slightly longer than the mast, leads down to the "antenna" terminal of a UK/PRC-320 at ground level (or a UK/VRC-321 TURF remoted from the set). With a decent set of counterpoise wires and a suitable number of rods this covers approximately 7MHz up to 12MHz as a 1/4 wave vertical and 21MHz upwards as a 3/4 wave. The Clansman ATUs will extend this range downwards quite a bit because they add series inductance at the bottom of the wire (like the coil at the bottom of a CB antenna). What you do need to avoid is a length of wire + rods that is naturally a 1/2 wave because that has a very high impedance at the ends which is hard for an ATU of the design used in the 320 and TURF25W to match to 50 ohms. Iain
  5. Hi and Thanks Yes I am still looking - can you let me know the seller details / item number ? Thanks Iain
  6. True. By quite a few years! It looks like it was part of something larger or intended to be attached to something more solid along one edge given that one edge has straps rather than eyelets and ropes. I wonder if it is part of a penthouse shelter or similar ? Iain
  7. Is the "AS90" under the arrow a clue ? https://en.wikipedia.org/wiki/AS-90
  8. Richard Also note that there are two versions of the GSA elements - the original design used between two and four 2 foot rods according to the frequency, later ones used between three and eight one foot rods which need a small phosphor bronze adapter to fit the base well enough to make reliable contact. I do have some base kits and new style rods if you are stuck for one but am a bit short of the adapters (or rather I have a bag of them but it is small and I don't know which box it is in since I moved house!). It should be possible to make one with a lathe. The EKGSA kit provides a set of three coax leads 1.5, 1 and 0.5m long, an inductor box and a mast head adaptor to hold the antenna base at the top of a 5.4m mast - I've also used one 5.4m mast fibreglass section on top of a Clark or RACAL telescopic mast as an adapter. The kit also includes a cord to allow the antenna to be suspended from a tree. The appropriate patch lead for the frequency in use is connected between the antenna base and the inductor unit to form what is effectively a sleeve dipole. The GSA works very well - certainly better than the ground mounted monopole "washing line" - probably about equal to land rover wing boxes with a 2m whip and TUUAM. What you do have to watch out for in the EKGSA kits is bad connections due to coax partly pulled out of BNC connectors on the patch leads because although they are provided with strain relief cords I don't think everyone used them all the time and buying new BNC cables in the correct length off e-Bay is a very good idea if planning on air use. Theoretically the "20W" UK/PRC-352 which really manages nearer 30W with a low loss EKGSA and the 50W UK/VRC-353 and a lossy (about 40% of the power goes to heat the base unit) are very nearly equal at the same antenna height. Iain
  9. Welcome here - I had three of them over the years (well two and a parts donor) - happy to share what info I have and can remember although I see you already have the service manual Iain
  10. Is the sound connector 7 pin circular like this: ? For the fibre LAN connections common military types are TFOCA (USA), Fischer FOH, and MIl-38999 DM - I think it will be a case of looking for pictures that match yours to find a source. The catalogue at http://www.techoptics.com/products/harsh-environment/multiway-connectors/ has most of the common types with links to the data sheets - if the LXI is the same as IARCCS it looks a lot like the HMFM type ? I did some work reconstructing the earlier BATES/BMETS Artillery fire control software that ran on a GEX PC-XT equivalent years ago http://www.g0ozs.org/misc/LACS/index.html - I wrote a DOS batch file to emulate the screens on a normal PC but it may be too long ago to run on any computer I have now. You could write a simple shell script or C program to run in a Linux console to produce similar screens I'm sure Best of luck Iain
  11. Anything to do with the optical tracking of guided weapons? - I guess at a range if a camera is aligned to the sight ? Iain
  12. Adam I think RR have the only substantial spares holding in the UK - and they had downsized when I last had contact with them. There are (or were when I last looked) a couple of sellers in French e-Bay but most don't ship overseas so you probably need a friend over there to act as your agent. The braking system is basically American (of Bendix design) and a lot of the small parts are common to US trucks of the period - the engine is similar to but not the same as the post war large capacity Ford V8s so again some parts are common but it is necessary to be more cautious there. The carburettor is the same type as used by early Porsche cars and refurb kits are fairly common in the US E-Bay Regards Iain
  13. Hi It is a Philips RT-4600 (Netherlands 1980s/1990s low band VHF set) - see http://www.cryptomuseum.com/radio/rt4600/index.htm Iain
  14. Hi Without testing I cant be sure but I think the IB2 audio socket provided to monitor the traffic when the IB2 is in rebroadcast mode can also be one station on the intercom if the IB2 box is switched to IC mode. So you would need one more crew box for the other station and a 12-pin cable to connect it to the IB2. Regards Iain
  15. Sorry I got the title wrong - I dont know how to fix it. I have ordered a 175R 13 since it is not too expensive and I will see if it matches - if it does I can get a local tyre place to change the tyre on my spare wheel Thanks again Iain
  16. It is a 6.70R13XCA tyre on the NCRS trailer - I tried 185x70R13C and it is about an inch below the top of the existing tyre, standing an unloaded wheel and tyre beside one on the trailer - so it will be a bigger difference under load. The rims on the wheel that came with the 185x70R13 were about 1/2" wider than the ones on the trailer but as you wrote, I don't think that will account for all of the difference ! Iain
  17. all the better to see the VDUs They were intended originally for a UK communications net to re-establish government after a nuclear war so had to be completely screened against electro-magnetic pulse to ensure that the equipment would still work. In practice they had a short service life and the radios were in many cases dismounted and used for other things (mine is labelled as having been at Sennelager in Germany!) Iain 73 de G0OZS
  18. The Chassis certainly looks like the Arrows chassis. The metal wheels and rims themselves aren't that rare - Ifor Williams agricultural trailers used them among others - the challenge I have found (with two failed e-bay purchases that turned out too small to show for it!) is that the tyres fitted are considerably taller than the ones on the civilian trailers and the tow ring height will be wrong if I change all of them ! Iain
  19. I use mine parked beside the house as an office/radio station/radio workshop so no room to sleep inside except maybe on the floor!. Someone had fitted an Ebersbacher heater in the left hand antenna box which packed up (and blew smoke into the cabin forcing a rapid exit!) last winter so I will go all electric before this winter I think (if anyone can use the heater remains once extracted they are welcome to it !). I have one of the original TRP8255 radios but also various others - I am doing some changes inside so will do a photo once it is tidy again. Iain 73 de G0OZS PS I think someone should retitle this thread from CVRT to NCRS to avoid confusion !
  20. Very nice ! There's a lot more room without the front desk/bench. Mine was used for a while as a bar/clubhouse between release from the MoD and my purchase so it came with a beer tap and pipes ! Regards Iain
  21. I haven't needed to fix the brakes yet (apart from freeing them after the handbrake was left on over a winter) - I believe based on my search for tyres (which is ongoing) that the wheels and tyres are of a type used by smaller Bedford vans in the 1970s which may be the best chance. Regards Iain
  22. Confirmed top, middle and two bottoms for 4m (you can actually chain any number of bottoms if creative about support or guying and I have tried 3 to get near resonance on the 20m band) Iain 73 de G0OZS
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