CB radio - SWR problems

[Russ]

Not sure if that'll be much help, the place he wants to put it is ideal, it clears the roof by 6 feet and has nothing near it to cause a problem.

Originally Posted by Raistlin

Would now be an appropriate time for me to post this?

Is that the vibrating version...?!

BTW its an Aerial. Ariel is for washing machines

[Raistlin]

Originally Posted by Graham

Is that the vibrating version...?!

Dunno, found it on a website that does all sorts of Rubber Ducky related merchandise.

[zoombini]

It would remove it from the scaffolding & allow him to check it's SWR without anything interfiering. (except the ground & you who is holding it )

[Russ]

We'll be trying some new and extra length coax today, we'll see how it goes

[At a loss]

In the antron 99's there is a resistor that is there to protect against lightning strikes. On a number of these antenna's it has been noted that dropping the antenna can cause this resister to fail (i.e. faulty stock cough cough).

Also all the sections screw together, but what is inside them is a length of copper wire which is then soldered into the coupling that the next section screws into. Sometimes not many when manufactured the copper interconnecting wire breaks when the coupling is being fitted causing no connection after that section (check with a multimeter).

(I used to sell them)

But basically with a swr of 2:3:1 after checking that the coax cable is 50 ohms and placing a 50 ohm dummy load at the antenna end instead of connecting the antenna and checking the SWR to make sure that it does not read the same.
If it does then its either the plugs incorrectly soldered/faulty cable (check again with multimeter)or possible faulty SWR meter.

If all is ok at the cable end then it has to do with the antenna.

Also check that the rings on the antron are somewhere just over the half way point. If at the bottom or right at the top then its been adjusted in the past.

One last point is that when SWRing in an antenna if the SWR is high on the highest band then on the lowest band (or frequency/channel) then the antenna is classed has electricially to long and needs to be shortened.

The opposite can be said if the SWR is higher on the lowest band/frequency/channel then on the highest band/frequency/channel then the antenna is to short and needs to lengthened.

Be carefull when adjusting the rings make a tape mark to pop them back it needed.

[zoombini]

Wow, that's a post for the most helpful thread if ever I saw one.. lol

[Russ]

Ok peeps, thanks for all the help....we bought new coax and made it a little longer, SWR is now down to 1:3 in the middle and about 1:6 top and bottom ends, an nice smooth signal - excellent!

[keptinkirk00]

The Problem Could Be The Amount Of Coax I Was Always Led To Believe You Should Do It In 9 Foot Lengths Ie 9,18,27 Etc

[Russ]

Thanks - but I sorted this out almost 18 months ago

[Graham M]

Interesting first post, regardless I'm fairly sure that this issue is now a bit dead considering the thread is more than 2 years old?

[mr_bo]

haha, lmao. I thought 'do people still use these?' then saw the thread had been revived from the basement. lol. How is the SWR anyway?

[keptinkirk00]

Right Then How Do I Make A Dipole Out Of Coax

[Jon T]

I know this thread has been dug up from the past, but can I just say that as long as a length of feedline(coax etc) is correctly terminated wiith the correct impedence at both ends, then the length of the feedling doesn't matter at all, never has and never will.

As to how to make a dipole out of co-ax, work out the length of dipole you need/require, half the mesurement and then strip that length of outer insulation from the coax, make a hole in the shielding and pull the inner conductor and it's insulating shield through outer shielding, this gives you the two dipole "legs".

Hang you dipole in your chosen spot with the feeder coming down at right angles at least a quarter wavelength.