yet another antenna question

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KK4ELO

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Smithville, Tennessee
i have an nmo mount antenna on my truck. it was a uhf p.s. 1/4 wave. i replaced it with an antenna that was originally an 84" whip..( have no idea what it was). i cut it down to the 1/2 wave length of 38 1/2" for 146mhz. will this do some good for my vx-150, or do i need to go 1/4 wave?
 
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Nope, a half-wave antenna presents a very high VSWR and needs a base impedence matching network to match the 50 Ohms that is expected st the antenna.
 
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That would be my suggestion, even with a impedence matching network your gain would be about 2 dB not enough to provide much performance improvement.
 

LtDoc

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Oklahoma
Before you start cutting, try this. Make the first cut at around 57 - 59 inches, then check to see if the SWR is acceptable. If it is, try it for a while and see if it performs to your satisfaction. If not, then cut it down to around 19 inches.
- 'Doc
 
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