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F1721 VHF - RX sensitivity alignment

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g8tzl2004

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The service manual is unclear. Is the front end RX alignment done at ONE test frequency ie. 136 MHz or THREE test frequncies 136 , 155 and 175 MHz??

Is it worth trying to get a few extra dB's of sensitivity with a VHF F1721 by careful alignment? I have UHF F410 and UHF F210 which uses similar RX alignment ADJ utility and alignment is very very "broad" - NO clear peak min quieting so careful alignment does not result in any improvement in sensitivity. Maybe VHF F1721 is different??

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ElroyJetson

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You can align the radio on the frequencies you are going to use it at, but this is best done only if you intend to use the radio in a relatively narrow band range. The factory alignment is meant to balance out receiver performance across the entire operating band.

Just align the radio at your intended operating frequencies, then test its sensitivity at the band edges as well as your alignment frequency.

Elroy
 
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