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Sirio M-4000

Buy a Motor home?
OK I had to do that.
Eddie, we can only add or subtract length to radiator ...and then use some type of matching network.
Mobile install`s are very unpredictable , where it is mounted, ground losses.....many things.
Like you said in the vid, the quick answer to the problem has always been...add a spring, or prune the coax and yes it will give some comfort to the SWR meter, but it is not always the most efficient thing to do.
If you can install the correct length, then use a matching network to solve the other side of the equation is the best thing to do.
Oh, i just put in 26.5 as a quick guess in that thread, to say that adding length to the radiator lowers the frequency.
Good Info Marconi.

73
Jeff

Well Jeff, if you just took a wild guess, at some number to post in the thread just to post some words, then I'm really surprised. I didn't confirm your words, because we go way back. That was a mistake. It does reassure us all however, just how the CB world gets riddled with CB Bull Shit from every angle, every day. I consider mistakes one thing, but this is more than a mistake. I'll have to take my video down, because you admit now that you didn't have a clue what the facts were. You just took a number out of the clear blue sky and chunked your CBBS comment.

That's really reassuring, but it is after all my fault, because I didn't ask you first. After reading the thread "1/4 in. whip" I was thinking I had recently modeled a series of 1/4 wave whips, and that was my attempt to verify my real life testing of the 1/4 whip in 2006.

Then I decided to do a video thinking about the thread more so than just your comment, which was really an after-thought in my process of making the video. As it turned out, in preparing my rehash of the models to present, I was a bit surprised that your statement was "right on the money" with my model, so I thought to use your claim in the video. Y'all were talking about a mobile install, and I needed some way to slip the modeling aspect into the discussion, and your comment seemed to me to be a good connection.

I also said to myself, "...boy, I'm proud of Jeff, he's on his game, must have been studying hard about antennas." Hey, I didn't even know that was what the model would show. I had to go back and plug the 26.5 mhz into my model...that was setup at 27.205 instead. What a surprise when it showed 1.509 SWR, with a 108" whip as the radiator and with 4 x 113.4" radials slanted down at 30* degrees.

I can't delete my words, but I can delete the video.
 
Marconi said:
You just took a number out of the clear blue sky and chunked your CBBS comment. . . I also said to myself, "...boy, I'm proud of Jeff, he's on his game, must have been studying hard about antennas." Hey, I didn't even know that was what the model would show

It was his subconsciousness that did it. He is so savvy it just emerges like the Swamp Thing from the primordial ooze of his mind. Next news you know and he'll be building Yagis in his sleep . . . ;) :D

"Hey, you Woodchucks, quit chuckin' my wood!"
 
When I say it was a guess, you think in your head that longer = lower, and you know how long the antenna is and look at what you would expect to see in your head.
You just see it because you play with it all the time.
No need to pull your vid down Marconi, It was not a wild guess, and I did not mean it is such, but I thought it would be close, and it was.
73
Jeff
 

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