Hello, I just want to find out what would be the problem with my vhf radio, I stored my radio for 11years and by the time thyat I,m gonna used it there,s a hamming sound and sometimes no audio is coming out when I,m using 5watts and 10watts. There,s no problem wityh my 50watts output.
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it is either 72MHz or 216MHz. There r a lot of utube videos on DIY Dipoles but u must change the length to match the frequency.
A VHF TV antenna will work for 72. Length = 39" each side-- 216MHz is going to be 13" - total will be about 80" and 28"
The issue is the matching xformer. A dipole presents 300 ohm impedance. The 200 is a 50 ohm Z. a typical TV matching xfmr is 300 to 75 so u will have to build the right one of maybe find one in a HAM store.
Google this - 1/2 wave dipole ham - for lots of ideas
since this is a fairly new radio, your only resource is your manual and schematic.
As a Ham you should be able to read them. If you are thinking of installing an aftermarket mic, you don't do this on most ham radios, they are not CBs that you can put a "power mic" on. too much audio input on an FM transceiver can make your transmission unintelligible
Firstly, I take it that you are a licensed Amateur operator, if not, you're breaking the law.
If, on the other hand you are licensed, then I would contact a friendly Ham operator, who would be only to pleased to assist, after all, Amateur radio operators spend most of their time doing just this kind of thing, as you well know, if you are indeed a licensed Ham operator.