Bob,
I've successfully used a MFJ-4416B boost regulator with my K2 and K3. I started using it with my K2 as after 3 or so hours on a 40 AH battery I would start getting reports of distorted audio on phone. With the booster I could get another hour or two out of the battery. After I purchased a K3 I used it with it as well. Somewhere along the line I also purchased a 70 AH battery and the booster worked well with that also.
I never received any reports of noise on my audio with the booster in use and did not find any noise or unusual birdies from the booster. Not to say it is a clean unit, just that I never had any reason to suspect it was generating RF noise.
If you purchase the MFJ-4416 be sure you get the "B" version. The previous version would sometimes blow an internal fuse if you "double clutched" the PTT within 3-4 seconds of each other. I think MFJ is only selling the "B" version but there could be other versions on the used market.
Take pride in the USA. 73
Jim, W0EM
>>>>>Sort of off topic, but I was wondering if anyone has any positive experience using boost regulators fed from a lead acid battery to drive their K3?<<<<<<<<
73, Bob, WB4SON
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