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M3KXZ

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About M3KXZ

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  1. Another of the 'tuner' section, shows the coiled quarter wave stub, the capacitor and the choke coiled on the core: And this is the Brownell plug removed from the base:
  2. Iain, feel free to add these pictures to your site if you like. Or if quality not good enough I'd be more than happy to take some more with my proppa camera!
  3. Pictures: Spring removed from base: Unscrew socket retainer by holding nut in vice and tapping retainer anticlockwise with a punch: Remove socket through bottom of spring: Pleasant surprise is the BNC plug connecting coax to the socket: Hope someone finds this useful. In combination with Iain's pictures it sums up all the internals of the Plessey tuner base, which isn't really a tuner at all! I'm going to build a matching transformer into the base of mine and make a modification to the fibreglass whip to get it onto HF just because it's a nice tough base section and quite sexy looking. 73 Pete M3KXZ
  4. Iain, this was easier than I thought it would be...... Removed the 6 screws that hold spring to the red insulator, held nut at top of spring in a vice, gently tapped the screw-in part that holds the connector in place anticlockwise using a punch and hammer. Once this screw is removed the connector can be removed through the base of the spring. And it reveals a nice surprise.... the coax connects into the bottom of it with a BNC plug. Pics to follow.....
  5. Whoops, almost certainly a vacuum inside so probably plug fitted in an oven. When I picked it up after removing the plug, I expected to give the base a tap and it to come off, but instead it fell off, hit the deck and pulled the coax out of the connection at the top of the spring! I now need to figure how to remove the socket at the top! Mind you, I wanted to do that anyway as part of my plan! Pete
  6. Thanks Iain. I'll whack it! I'm not sure about the nitrogen or dry air - I was wondering if that plug might be a screw in desiccator to keep the innards dry. But I've just removed it and it's nothing but a plug so you're probably right. I expect the plug is inserted in dry air.
  7. New here, but been M3KXZ for good few years now. Active on HF using CW (very occasionally SSB), always portable somewhere. Getting better and better. Still wanting to upgrade but with working about 7 days a week, and family..... never enough time! Pete M3KXZ
  8. Iain, that's great. Did you find the base a pita to get off? I removed the screws but can't budge it, so need to use some force but don't want to damage it. I'm thinking about building a different choke/transformer into the base and also modifying the whip so I can fit a section or two of my Clansman whips to the top. Bottom fibreglass whip section will remain coaxial so I'll end up with something like a vertical Zepp/"no counterpoise antenna". Intention is to have something to work reasonably from 20m-6m (possibly 30-6), i.e. I can get a good enough match to 50Ohm coax such that the 3 metre run to the TS480 won't be too lossy, and then use the tuner in the TS480. I'm using SG237 at the moment, positioned right at an antenna feedthrough for a whip, but would like to do without that so I can put it to use elsewhere. Also, it keeps draining my battery when I leave it connected. I figure that the losses incurred in a decent choke/transformer and short length of coax to the rig won't be significantly different from those incurred by the small inductors in the SG237 when matching weird loads! 73 Pete M3KXZ
  9. Hi again Iain. I see from your web site that you've pulled apart a pineapple. Just wondering, is the thread atop the pineapple same as on this Plessey base? For info, earlier on today I connected the Plessey base and fibreglass whip to my FT817. It's a pretty good match right across the 2m band. Crap on 70cm, reasonable match on 10m and lower but unsurprisingly deaf as a doorpost there! 73 Pete M3KXZ
  10. Hi Iain. Have you carried out any dissection yet? 73 Pete M3KXZ
  11. Hi Iain. That's also the frequency where I found a good match using the MiniVNA. I tried shoving 6V up the coax hoping I might hear something click, or maybe see some current draw, but there seems to be nothing. Putting ohmmeter across the terminal show completely open. I'm becoming more certain that there is just an RF choke or unun, perhaps on a core, and with a capacitor on the antenna feed. Will keep digging.... I did email Ian, M0YMK, who is chairman of the Vintage and Military ARS in the hope that he might know something, but he has never come across this antenna before. 73 Pete
  12. BIG THANK YOU TO COLIN (MATTBLACK).Colin, the whips arrived safely the day before yesterday (Thursday). Very pleased - thank you very much. Pete
  13. Thanks chaps. I'm wondering if this might not be anything complex. I know for sure there is a capacitor in series with the element. But I'm having a feeling that there might be something as simple as an unun. There's not much room and the concave base of the tuner ring on this doesn't leave much room for electronics. Also there's a breather/dessicant thing in the base marked with an M and made by Brownell ltd. This company make these things for keeping transformers dry. Pete
  14. Colin (mattblack), I notice that the bottom tuner section isn't in the base in the picture. Mine still has it on. Have you ever disected one? I'd love to know exactly what's in it. Pete
  15. Perfect - they're the puppies. I'll reply to your email at lunchtime and sort out PayPal for 2. Cheers! Pete
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