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About g0ozs

  • Rank
  • Birthday 12/19/1965

Personal Information

  • Location
    Near Mendlesham in North Suffolk
  • Interests
    Clansman and Larkspur era radios, past owner of a Simca SUMB radio truck, now a Defender 90 GS
  • Occupation
    Telecommunications Engineer
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  1. Rob my 3 were all registered on arrival in the UK by the importing dealer, years before I had them. So I haven't had to attempt the process from first principles - and they were registered as 1959 manufacture, PLG, 4 wheel pickup, 4500cc, 3475KG GVW, 2 seats. I think things have changed since they were imported circa 1995-2005 (I bought my first in 2009 and it had been in the UK for around ten years by then) so more expert advice is called for. It may actually be better to treat it as a private HGV so as not to have to stay under 3500KG which is possible but tight. I did take some pre
  2. Wally Best to get new cable if you can so it will not perish within our lifetimes if ever ! I would go to one of the major electronics suppliers like RS or CPC/Farnell e.g. https://uk.rs-online.com/web/p/cy-cable/0529576/ HTH Iain
  3. I have never found a serial number to year database. There was a breakdown of production by year in an issue of "Charge Utile" magazine - It was a 3 part article starting in No. 110 - they do turn up sometimes on E-Bay and I think the production breakdown was in the 2nd part. If I find my copy I will post the page here. Unfortunately the production (or at least French Army orders which is what it actually listed) only add up to just over 10,000 and the serials of the three I owned at various times were all in the 14,000-17,000 range. So whether they started from a number larger than 1 or
  4. Iain Most of what I know about US handsets is from Brooke Clarke's site http://www.prc68.com/I/H33.shtml and his other pages. The H33 (12 pin connector) and its relatives seem to have a carbon microphone (which needs a DC supply to work) and a lower impedance earphone - having said that German versions of H33 for the SEM-25 and SEM-35 radios which are mostly what turn up in European surplus stores and ebay auctions do have a higher impedance dynamic microphone - I know because one did not work as the operator headset of a SB-22 telephone exchange ! The more recent ones with 5 pin co
  5. Ideally you should get EMER C472 from VMARS or another archive which is the Clansman Headgear technical description that includes circuits. In summary the transducers in the original 1970s series of headsets and handsets are all 300 ohm impedance and of dynamic (magnetic) type, the PTT is a 2 pole switch both connecting the microphone to pin A when pressed and connecting Pin F to ground/ The two earphones are independent each being connected between pin D and ground or pin F and ground. Handsets with one earphone and speakers are driven from pin D (left ear). Colour coding is not quite st
  6. Barrie I have also bypassed the transformers (UnUns?) to allow direct feed of a quarterwave whip on 4m and 6m. They do appear to have an impedance matching role because the 1/4 wave looked nothing like it should to an antenna analyser until the transformer whatever it is was bypassed. One slight caution - the pigtail from the antenna clamp to the tag in the matching unit is getting to be a significant part of a 1/4 wave at 2 meters and is somewhat coiled when assembled, so the correct resonant length of rod is a bit less than expected - this is noticeable on 4m and expect will be quite si
  7. Ken is about 20 miles SE of me near the coast - I know him well ! 73 de G0OZS
  8. 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
  9. 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.c
  10. 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 th
  11. Hi and Thanks Yes I am still looking - can you let me know the seller details / item number ? Thanks Iain
  12. 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
  13. Is the "AS90" under the arrow a clue ? https://en.wikipedia.org/wiki/AS-90
  14. 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
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