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Modifying an aerial?; Can I do this?
Topic Started: Monday, 7. March 2011, 23:38 (497 Views)
Toni Vines
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26 Charlie Tango 291

Right, I know I'm mad but here goes! I've been given an old Diamond DP-TRY2E magmount aerial. As my funds are limited (read non existant!) I'm wondering if it's possible to adapt this to CB. It's a dual band 2m & 6m mobile ham aerial. I'm wondering if I cut the lengh of the whip will this bring it to CB frequencies?
Any advice would be great!
Thanking you all,
Toni Vines.
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VoG
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Hi Toni

The problem that you're going ot run into is that the aerial length for 2m and 6m is shorter than required for 11m. A half wave on 2m is about 40", on 6m it is about 118" and on 11m (CB) it is a whopping 219". So the chances are that the DP-TRY2E aerial is going to be too short. It does depend on what configuration the aerial is, if it is a Full Wave aerial on 2m then it might be possible to make it into a Quarter Wave on 11m, but to be honest I think that's unlikley.

The only really easy way to experiment would be to put an antenna analyser on it and try a few whip-lengths to see what comes out, but as analysers cost the price of ten or fifteen CB Mag-mounts that's hardly saving money.
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MadMark1
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163 Charlie Tango 020
I guess it works as a 5/8 wave on 2 mtrs and a loaded 1/4 on 6 mtrs ? if so then it could be modified to work just by making the whip longer, BUT if it has any matching built into the base ( such as capacitors or Matching transformers ) then it proberbly wont tune to any other bands. the only thing to do is give it a go.


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