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Sunday 20 July 2014

T2LT choke dilemma

Now as you know, I am planning to build at least one T2LT antenna, using the design outlined in 26CTX104's video on his UKCBTV YouTube account, but I had a dilemma, what to use as the former for the choke, an important component that separates the antenna and coax as this antenna is not only a dipole for all intents and purposes, it is also made from the coax, I had a look at a few ideas, B & Q sold long lengths of soil pipe that had a slightly wide diameter and I could not transport on my scooter, Homebase were no good at all.

So I thought to myself "what do I already have that I could use?" after carefully measuring the diameter of various round objects (cocoa tin, golden syrup tin, fizzy drink bottle, cider bottle and empty marshmallow fluff tub) I then remembered that I still had the two pieces of tube I used for the choke on the ill-fated inverted-V dipole I was intending to use in the loft but for many reasons didn't, I measured this, bingo, 4" diamater, a quarter of an inch shy of 26CTX104's findings but should be fine if the turns are the same (around about 5, I've seen 5 turns on 4" former reported to work fine).

So, I intend to begin today by running out a short length of the coax I have, which is 100m of RG58 which I bought partly to do this, today, winding the choke, fitting a PL259 on the other end, sealing the plug up with some Sugru where the coax leaves it to stop water ingress (I have heatshrink but of the wrong diameter for the PL259), it will take around 24 hours for the Sugru to fully cure and I don't know if any operators have used it on their PL259s, perhaps this is a first, but perhaps not.

So, I'll let you know how I get on, also just need a fibreglass pole and some means to fasten the antenna to it, and I should be on the air very soon.

73 de 26CT730

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