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Old 26-05-2017, 10:33   #1
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AT-130 tuning problem

Hi All --

I just overhauled my ssb system in preparation for another cruise. I have an Icom 710 Pro that is "opened" to transmit on all freqs, and an AT-130 tuner that is grounded by new copper strap to a dynaplate, and connected to an insulated backstay. The wire and connection to the backstay are new, but this setup worked the last time we went cruising. My problem is that the tuner only tunes some frequencies but not others, in a seemingly random fashion. I had the tuner box open when I overhauled the system and everything inside looked good ie no overt signs of corrosion. Any thoughts as to what would stop the tuner from tuning? Thanks in advance for help and ideas.

Grey Wicker
S/V Sa Lako

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Old 26-05-2017, 11:01   #2
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Re: AT-130 tuning problem

it won't tune AM channels - could be as simple as that?

S/V Gudgeon
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Old 26-05-2017, 11:28   #3
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Re: AT-130 tuning problem


Connections, connections, connections. Your setup sounds OK, and I assume you've checked most of the obvious connections.

Be sure to check the control cable connections between the transceiver and the tuner. Use some De-Oxit on these, and other electrical connections to be sure of good contact. BE VERY CAREFUL when opening the connectors at each end of the control cable. It's very easy to break something, bend a pin, etc.

Also, if it's not too hard to get to you might open the AT130 and check all the interior connections, especially for the control cable. I found last year that a SG230 tuner which was 20+ years old and I assumed had failed suffered from loose interior connections. Tightened them all up and Presto: the tuner came to life.

I assume you have either an M710 or a M700Pro....or maybe a M710RT. There's no M710Pro that I know of.

Good luck.

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Old 26-05-2017, 15:11   #4
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Re: AT-130 tuning problem

Speaking from shaky memory here. Our AT-130 had some tension on the feedline, can't recall which one. Anyway, the feed line tension had transmitted to the circuit board and lifted the soldered connection. I resoldered it and all is now well. The feed was not well isolated from outside mechanical stress.
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