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Author Topic: SB1000 mod  (Read 1458 times)
KC9EOT
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Posts: 38




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« on: April 18, 2006, 11:22:43 AM »

I rebuilt and SB1000 amp and I added a variable capacitor of the type you would get out of an old table top radio, something like 4 to 365 pf or what ever they are. I put the cap from the common or switch arm of the filter network on the radio side, to ground.
The purpose for this is that after all the coils were tuned up I noticed a small amount of swr between the rig and the amp. This is a way of fine tuning any residule swr out and allows me full power on all bands across all bands. Works well.
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K0BG
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Posts: 10248


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« Reply #1 on: April 18, 2006, 07:21:34 PM »

Most of the SB series of amps had a reasonable input SWR. Certainly usable by the majority of modern SS transceivers. If yours doesn't, the first question I have to ask is, how are you measuring the input SWR. If you are using the internal meter of your transceiver, regardless of who made it, or how old it is, the SWR reading is far from accurate.

I'd be willing to bet, that as stock it was under 1.6:1 all all bands except on those amps that do not have WARC bands included.

Alan, KØBG
www.k0bg.com
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