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Discussion in 'CB Antennas' started by Turbo T, Jul 22, 2012.
That be the one, I think apart from the performance it looks good too
Has a slick commercial flair
Needs a happy face? Disney logo?
Unlike the menacing appearance of the tax-dollar-being-used-against-you Larsen?
Dog dish hubcaps on blackwall versus full covers with whitewalls? Biscayne versus Caprice? I6-250 versus V8-427?
Hell, just mount a Rebel Flag Connex inside.
(Quality of photo and final processing is the giveaway).
The black Larsen base / coil arrived and I had to order the matching black mast separately.
Maybe I will buy the Laird also so as to compare the Larsen, Laird and Browning BR-140-B.
All black will be my choice as well. Or chrome film onto base plus polished whip. Hmmm
If a vinyl shrink-tube was applied to a polished chrome or stainless steel antenna, would the antenna still function?
Sure it dont see why not. If your referring to what we call shrink wrap. I had a buddy that was worried about water getting in the joint 1/2 way up a vhf/uhf vertical base antenna. He shrink wrapped the entire thing from the radials to the top... worked fine.
Yes, I am referring to the material used by electricians to cover a spliced wire connection. A heat gun / hair dryer is used to apply the shrink tubing / sleeve. For the folks (like me) who don't like the chrome bases on mobile antennas, the coil / base can be covered with the black shrink tubing.
The instruction / guide sheet with the Larsen was a good "guide" for trimming the antenna for 27Mhz. The antenna was 49" long and the instruction sheet recommended a length of 47" for a roof mount installation without a spring and a length of 46-1/4" with a spring. Being that the antenna is attached to a Third Brake Light Antenna Adapter, I wouldn't consider the antenna to be classified as a "roof mount" installation. Starting with the original 49" long antenna, I trimmed-off 1/2" pieces until the SWR was down to 3 and then I trimmed-off 1/4" pieces until the SWR was below 1.3 on all channels, being 1.3 is on Ch. 40, 1.1 on Ch. 1 and 1.2 on Ch. 20. I'm done! Final length is 46-1/4".
Next task is to compare the transmit and receive of the Larsen and the Browning BR-140-B.
The length of the Larsen was also 49" and after trimming-off pieces to obtain a 1.1 to 1.3 SWR, the final length is now 46-1/4" and the final length of the Browning BR-140-B is 46-1/8".
Now I know why mine would not tune!!! Guess im gonna have to do some trimming
The "trim chart" which came with the Larsen has a roof-top mounted NMO27B / NMO27C having a trimmed length of 47" without a spring and 46-1/4" with a spring for 27 Mhz. I do not have a spring and the SWR is great at 46-1/4". Go figure! My first cut was 1". I had to remove the black paint / coating to ensure the antenna was fully inserted into the socket before checking the SWR. I don't know if it makes any difference, but I always file the cut-end as flat as possible after I cut the antenna with pliers so as to get that warm and fuzzy feeling that the bottom of the antenna makes good contact with the socket.
As per Larsen's Trim Chart, the operating range for the NMO30 is 30.0 MHz to 35.0 MHz with antenna lengths from 35-1/4" to 51-9/16". What is the length of your antenna with the NMO30 coil? I am curious if all coils are the same and only the antenna length is different.
Save the file.
Given the picture posted of, Recon’s Dog, I’d imagine that son-of-a-biscuit could make it shark-bite clean.