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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??