predator 10k competition antenna length

[dxing440]

Does anyone know approx, the stinger length (above the adjust point), or the overall length of the 12" single coil, when its resonate at 27.205

 

[mackmobile43]

Does anyone know approx, the stinger length (above the adjust point), or the overall length of the 12" single coil, when its resonate at 27.205

72 to 75" depending on it's view of it's counterpoise for the 12" single coil

 

[dxing440]

(it's view of it's counterpoise)?

i dont understand this ,counterpoise. sorry

 

[mackmobile43]

(it's view of it's counterpoise)?

i dont understand this ,counterpoise. sorry

Ground plane or the metal surface to which the antenna is mounted

 

[The DB]

Counterpoise is what most people call the ground plane, typically the metal body of most vehicles. Where the antenna is in relation to the counterpoise (or the metal body) effects the tuning of the antenna as well as its radiation pattern.

Every vehicle is different. Every antenna is different. Every place you mount the antenna on the vehicle is different. The best thing to do is mount your antenna where you wish to run it and then tune it.

I don't know that I would personally trust an average, it will likely work but there are to many variables at play, and likely will not be the absolute best for your needs.


The DB

 

[dxing440]

Cool, its on a steel 3/4" tube 16" tall, with a flat mounting surface of
2 1/5" x2 1/5" just above the cab. BUT the overall length is about 65"
I m gonna readjust. thanks

 

[mackmobile43]

You may find that it may not tune on a stand like that, I could not get a monkey made to tune below 2.0:1 in that situation

 

[555]

same here i built a stand to mount a bracket to for a reciever hitch mount it never saw below a 2 swr

but i took a metal trashcan lid and it dropped to 1.2
so that told me i needed some metal under the antenna
and mounted it to the trunk lid no problem

stinger length will also vary with the shaft length below the coil

 

[gamegetter]

tuning and matching...where's Doc? LOL

i'll just say that trimming your antenna to improve match can detune your antenna. savvy?

i always look to increase capacitance to ground by proper bonding of vehicle body and body to frame first.

http://www.k0bg.com/match.html