Welcome Guest [Log In] [Register]
Welcome to the official Charlie Tango DX Group CB And Amateur Radio Forum. You are visiting the UK's biggest and most active CB Radio club.. We hope you enjoy your visit.

Charlie Tango DX is a group dedicated to Hobby Radio Users in all forms, whether CB, Amateur, PMR446, Scanning and Short Wave Listening.
We are a very active and friendly group that welcomes anyone from anywhere in the world who has an interest in Radio, regardless of their level of experience, their equipment, their location, or their radio preference. We have members varying from fully qualified operators on the Amateur Bands, to newcomers who have just bought a PMR446 set, and many CBers both old and new. All are equal on the Site.

The CT Site contains many reviews, tips and modifications within the forums, and we take pride that no sensible question is ever left unanswered, and nobody is ever belittled or mocked for asking an honest question, no matter how simple it may seem. We were all new to the hobby once.

You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join Charlie Tango you'll be able to access member-only sections, and use member-only features such as customizing your profile, sending personal messages, voting in polls, viewing modifications and more.

If you are not yet a member: Registration is simple, fast, and completely free. Simply CLICK HERE to start the Registration process. Your application will need to include your personal name and approximate location, it will require you to confirm your email, and then be signed-off by one of our Admin Staff, but this is usually completed within 24 hours (48 max)

Username:   Password:
Add Reply
1,000 Watt Antenna coil
Topic Started: Wednesday, 6. May 2015, 13:55 (1,040 Views)
Deleted User
Deleted User

Posted Image

1KW Coil from a Silver Rod :doh2:

Seems like a bit of a stretch. Don't get me wrong I like the Silver Rod but saying it can take 1,000 Watts might be a bit of a stretch of the truth. For how long ? 0.1 seconds :clap:

Of course no one is actually using 1kw with one but I doubt that thin wire could take 1kw for long before it melted.

I suppose it ultimately depends on what kind of volts and amps you see on a radiating element. Maybe it is all volts and
very low amps so there is little heat in the coil ?
Quote Post Goto Top
 
Deleted User
Deleted User

I wonder if it is possible to replace the wire on this coil with better quality/thicker wire and still get it to SWR in ok? If so and I put thicker wire around it with the same number of turns would it have the same inductance value ? I imagine the thickness of the copper core/spacing between the copper coils from thicker wire could create a slightly different value to the coil.

The DB would this be something worth doing or are any gains largely pointless. i.e. does thicker coil wire reduce coil losses or only
effect power handling ? Thanks in advance.

In comparison the HP5000 mobile antenna has a nice thick copper coil in it. (Can take 1.5KW supposedly)

Posted Image
Quote Post Goto Top
 
The DB
No Avatar


RadioDaze
 
I wonder if it is possible to replace the wire on this coil with better quality/thicker wire and still get it to SWR in ok? If so and I put thicker wire around it with the same number of turns would it have the same inductance value ? I imagine the thickness of the copper core/spacing between the copper coils from thicker wire could create a slightly different value to the coil.

The DB would this be something worth doing or are any gains largely pointless. i.e. does thicker coil wire reduce coil losses or only
effect power handling ? Thanks in advance.

In comparison the HP5000 mobile antenna has a nice thick copper coil in it. (Can take 1.5KW supposedly)

When it comes to coils there is more than just the coils inductance in play. Coils also have a certain amount of capacitance as well. This capacitance comes from the spacing of the wires. Using a larger diameter wire to replace a smaller diameter wire will have two effects outside of the amount of current the coil can handle.

  • As the RF signal is an alternating current (and by extension alternating voltage as well) there is a difference in potential voltage from one loop of a coil to the next. If there is enough of a difference in voltage you can have arcing across the coil, which is not good. This will obviously negatively effect power handling, and can cause spiles of high SWR which can then damage your radio/amplifier.
  • Because there is also capacitance in a coil[1] the coil's capacitance will effectively cancel some of the coil's inductance. The more capacitance you have, from say coils of the same size made out of thicker wire, without additional spacing, the more inductance will effectively be canceled out from this increased capacitence, which by extension will make the coil have that much less of a shortening effect, which by extension would require a longer whip to compensate.
Long story short, if you use thicker wire you generally want to modify the coil design to keep the space between the loops of the coil equivalent to maintain power handling, and if you wanted to increase power handling, maybe space them even slightly further apart than that. This will, however affect inductance to a point. How much the coils inductance is affected depends on the coil design itself.


The DB
Online Profile Quote Post Goto Top
 
Deleted User
Deleted User

Ok thanks for the clear advice as always The DB, it is always more complex than meets the eye. It will be left as is, fortunately it sees nothing like 1KW, lol.
Quote Post Goto Top
 
Deleted User
Deleted User

I just want to add I think these are excellent antennas for the money irrelevant to how long the coil could take 1KW for. I would buy one again if mine broke, which it shows no signs of doing and it must have been up and down 5-6 times so far.

I easily like it as much as my Gain Master.
Quote Post Goto Top
 
MadMark1
Member Avatar
163 Charlie Tango 020
Ive put 1200 watts up an Antron 99 without any problems, Although it did snap in the wind at the brass threads between the bottom and middle section..

Ive also put 300 watts into a Dia-A-Match... that didnt last long.. Ha..

That coil though, Doesnt look like it will take a 1000 watts, Not to me.. Ide be cautios with a few hundred.. :-/

Mark
Gw0wvl http://www.qrz.com/db/GW0WVL

Facebook https://www.facebook.com/groups/1568501233420524/

My Youtube site ... http://www.youtube.com/MrMadjones

My website
... http://mjmotorbikes.weebly.com/

My Radio website http://gw0wvl.weebly.com/

"It's not the class of license that the Amateur holds but the class of Amateur that holds the license"
Offline Profile Quote Post Goto Top
 
Deleted User
Deleted User

Someone mentioned they can take at least 700W in practice so there you go. Not bad going.
Quote Post Goto Top
 
Hurricane Harry
No Avatar

RadioDaze
Sunday, 10. May 2015, 17:59
Someone mentioned they can take at least 700W in practice so there you go. Not bad going.
I thought I was tuning up my new amplifier into the large dummy load on 10m, giving out 1,400W. I didn't realised that my antenna switch was in the wrong position (for silver rod) and not into the dummy load! :o I checked the coil and choke balun straight away, thankfully there was no sign of burning, scorching or flash-over damage. It still works okay and the SWR is 1.2:1.
Offline Profile Quote Post Goto Top
 
RadioDaze
Member Avatar

Hurricane Harry
Sunday, 30. August 2015, 14:48
RadioDaze
Sunday, 10. May 2015, 17:59
Someone mentioned they can take at least 700W in practice so there you go. Not bad going.
I thought I was tuning up my new amplifier into the large dummy load on 10m, giving out 1,400W. I didn't realised that my antenna switch was in the wrong position (for silver rod) and not into the dummy load! :o I checked the coil and choke balun straight away, thankfully there was no sign of burning, scorching or flash-over damage. It still works okay and the SWR is 1.2:1.
Good for you and thanks for the input.
Offline Profile Quote Post Goto Top
 
Hurricane Harry
No Avatar

It's not something I care to repeat. :-/
Offline Profile Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
« Previous Topic · Aerials, RF & QRM Section · Next Topic »
Add Reply



This Website, Name, Logos and Products Are Copyright To Charlie Tango DX Group Copyright © 2009 - 2017
All Rights Reserved - No Part Of This Site May Be Copied Without Prior Written Permission. CharlieTango.co.uk have a legal Common Law Trademark and Registered Copyright #S0RN-LTC9-8CXT-LZLU of the brand "Charlie Tango" since 2009 and related Copyrights in place for domain names, Logos, images, format and layout of this website and associated material. charlietango.co.uk & charlietango.uk
Copyrighted.com Registered & Protected




View My Stats



DOMAIN NAMES FOR SALE
ConspiracyEffect.com | V5Bid.com Auction | 041183.com | Hiya.Mobi | VR Portal.Net | TrainerSox.com | CoinStealth.com | ChoccyBox.com Domains | FlutterBets.com | CharlieTango.UK | HallmarkedGold.com | MozSubmit.com | HorizontalEarth.com
CharlieTango.co.uk contact email leewardill@gmail.com