CB questions

Apr 24, 2009 45 Replies

In message , Lee_D writes

Have you joined RAYNET, Lee. I think they are still active in Staffs.

He'd have to trade something in

Perhaps his 110

Who'll make the first bid

DieSea

No , I've not looked in to it. Could be a bit of a busmans holiday IYSWIM but I may look in to it when I get some other things out of the way.

Lee D

B-)

I suspect that you could well be more useful doing the day job for any incident that would require RAYNET.

A lot also depends on the attitude of the local CEPO. When I was involved some had their heads so far into the sand you couldn't see their arses. Staffs where one of the more on ball counties IIRC though.

Slightly altered now a days Dave

One group I know gets £5k a year from their CEPO

Another group has two permanent representatives on a county Coop's panel

But a third CEPO wouldn't touch RAYNET with a bargepole ,

Secure communications is muttered on each occasion

Then of course there is the Hierarchy who must turn out in their full regalia for EVERY occasion

Big Fish in a little pool springs to mind

DieSea

In message , Austin Shackles writes

Aye; not too bad, AFAIK. I had (maybe still have, somewhere in shedspace) a Uniace 100, and that was a pretty good rig in its day. It worked OK as a base rig, working into my 28 MHz amateur-band vertical centre-fed dipole via an antenna tuner unit, and also in the car, with the centre-loaded mobile antenna whose name I forget, or with a base-loaded Half-Breed. I got 1.5:1 SWR or better across the UK CB band with either mobile antenna.

I agree entirely. Also, the shorter the antenna, the narrower SWR-bandwidth you'll get; if you can manage 1.5:1 or better on all channels, you're doing well with some of the really short ones. The 2ft. Dial-a-Match was easy to tune, but a very poor (lossy) antenna. The 2ft. Firestik types were better antennas, but somewhat more difficult to tune up.

I've not tried a short antenna with am 80-channel UK-plus-CEPT CB rig, but I doubt that one would give a low-enough SWR right across both bands.

Most reasonable rigs would survive up to 2:1 or so SWR (some of them reduce their power automatically if they 'see' a bad match), but some of the cheap/poorly-built ones didn't.

A short base-loaded antenna ought to be good enough for 1.5 miles across flattish terrain. A selection of pre-tuned antennas, of different types/lengths, and on bayonet-style quick-release mounts, might be a way to go.

Some of the shorter antennas will 'cook' their loading coils with very high power. On my 29/51/145/433Mhz amateur mobile set-up, the loading coil on the cut-down centre-loaded CB whip, about 4ft. 6in. long, which I sometimes use on 29MHz FM with that rig (Yaesu FT8900R; 50 watts) can get warm on a long over, but nowhere near hot enough to damage the antenna. The coil on my base-loaded Half-Breed, now also cut-down to

29.4MHz centre-frequency, also gets rather warm. Coils on shorter antennas will get proportionately warmer, and can melt if heavily over-run.

One antenna to consider might be the type where the coil is 'wound' into the whip itself, made of black-coated (anodised/enamelled?) steel. I have one of these, with the coil about 1ft. up from the base. It's about

5ft. Long overall, but I've seen shorter versions. I've cut mine down for 29MHz amateur use, and it tunes up no problem; it's taken quite a few clouts from low branches and survived, too, as the top part of the whip is quite thin and flexible.

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