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Maratrac VHF highband retune

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wcu02mpa

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Joined
Jun 10, 2006
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395
Location
Asheville,NC
I have recently aquired a maratrac VHF highband that I programmed down to 144. I have never had any problems doing this but this one just "clicks" when I try to transmit at 144.59. I am assuming the VCO is out of lock. Can anyone give me a tutorial on retuning the VCO. I don't have a service manual and cannot find anything on this band. I can find a UHF and a lowband tutorial. I need to identify which coils are VCO's and what test point is used for SL voltage. I am assuming the usual lock voltage is between 2-6 volts.

Thanks in advance.
 

cmdrwill

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Mar 30, 2005
Messages
3,903
Location
So Cali
The Maratrac VHF will not work below 146 mHz due to the firmware not having control of the transmitter deviation and power controls.

Get yourself a Hi Power 110 watt Spectra, It does 144 to 174 with no problems.
 

wcu02mpa

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Joined
Jun 10, 2006
Messages
395
Location
Asheville,NC
Thought I would try

I have had one in the past that would work. I know I have tried others and the power level goes crazy below 146. It would shoot to 150 watts. I thought I would try this one but have decided to leave it alone. i actually have a 110 watt A9 spectra and am getting ready to install it along with a TK-630H I have retuned for 6-meters. I will post some pics when done. My spectra is great down to 144. I have an IFR 1000S service monitor and have fully bench tested it. .2uv on receive and 105-110 watts on transmit across the board.
 
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