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Old 24-04-2012, 07:58   #1
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Join Date: Nov 2007
Boat: Beneteau FIRST 42
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Adding a Linear to SSB

Going to add some power to my Icom 802 with a Commander 150 Linear..
And now I'm wondering , Do I put it between the radio and the AT140 tuner or after the tuner..
Was thinking that after the tuner, on the antenna, the 140 now has to tune throu the 150, which might cause problems..
But if I mount it between the two, the tuner now has to put up with the extra power..
Any Ideas?????????????????
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Old 24-04-2012, 08:16   #2
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Re: Adding a Linear to SSB

Do NOT put a linear amplifer between the M-802 and the AT-140 tuner! You will blow the tuner for sure.

Also, do NOT put a linear amplifier after the AT-140 tuner. These tuners are made to work into an end-fed, random-length wire, not thru coax to a linear.

I'm not familiar with the Commander 150. The 1250 and 1250E are great linears, which put out a very hefty signal. Only way I can think of to use them on a boat would be with a completely separate antenna system which included either a manual of automatic tuner AFTER the linear which could handle the linear's output.

The goal in designing your system is to ensure that both the linear and the radio each see 50 ohms impedence at their outputs, and that any tuner can handle the applied power with ease.

I use a 600W linear every day with a random length, end-fed antenna (like a backstay). The exciter is fed to the linear whose output goes to a high-quality tuner (Palstar AT1KM) which has repeatable settings. Output goes directly to the antenna. The ground system needs to be attached to the tuner's ground.

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