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CB27S Tuning?

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YUKKURi

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So, a bit of a dumb question, but I have a Laird CB27S that I haven't installed yet, and I still need to tune it. For CB use, would I trim it to 47" for 26.750 MHz, or to 45.5" for 27.0 MHz?
 

JayMojave

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Mojave Ca
Hello Y+7: Whet you need to do is install the antenna and tune it ( adjust the whip antenna length ) for minimum SWR at the frequency you want to use. As most mobile antenna installations are almost all different. Suggest you start with the whip installed in halfway into the base and adjust the whip length for minimum SWR.

Most all of these CB Antennas are pretty much easy to install and tune.

Let us know how you make out there...

Jay in the Great Mojave Desert
 

YUKKURi

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Thank you all for the feedback! I think I ended up with some pretty decent results. The radio I have it hooked up to is a 980 SSB.

I managed to tune my CB27S at one point down to an SWR of 1.04 on 1 and 1.45 on 40. Being ambitious as I was, I thought I could push the SWR for 40 down further another 1/4" trim, but ended up bumping it up to 1.52. Rather than trying to fiddle with it anymore, I decided to cut my losses (huehuehue) and settle for 1.04 on 1 and 1.52 on 40.
 

KC4RAF

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Davenport,Fl.- home to me and the gators and the s
Wow, 1/4 inch cut is big.

Usually only cut ~1/8 th. at a time. But anyway, you're still good with what you have on 40. Don't sweat it, you'll be just fine.
(now if you are trimming an antenna that you know is pretty long and does need to be shorten substantially, then 1/4 is okay. But if you're in the ball park, always go 1/8 or less.)
 
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