Forums Forums - Off Topic Forum FUN





Go Back   Forums Forums - Off Topic Forum FUN > Off Topic Forums > Ham Radio Forum

Ham Radio Forum A place for ham radio enthusiasts to talk shop

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 05-19-2016, 05:51 PM
JimVT's Avatar
JimVT JimVT is offline
Bronze Member
 
Join Date: Oct 2005
Location: Enumclaw WA.
Posts: 3,349
Thanks: 4
Thanked 1,063 Times in 517 Posts
JimVT is on a distinguished road
Default antenna lead got to close

I was behind my place back in the timber and decided to transmit on high power.
antenna started flameing and stopped when it stopped transmitting.
75 watts


I was in my Polaris high lifter .
it hasn't done anything to my plastic roof and it lays tight aginst it.
jim
__________________
Jim KF7RiN
#185 snow trac
2004 pistenbully canyon
Reply With Quote
  #2  
Old 05-19-2016, 07:52 PM
Doc's Avatar
Doc Doc is offline
Forum Admin

 
Join Date: Sep 2005
Location: Ohio, USA
Posts: 31,825
Thanks: 12,697
Thanked 10,212 Times in 4,311 Posts
Doc will become famous soon enoughDoc will become famous soon enough
Default Re: antenna lead got to close

Whoops. Glad you caught it, and saw it before more damage happened.
__________________
Scott me up Beamy.

Other Fun Forums:

Net Pet Talk + Net Tractor and RTV Talk + Net Cooking Talk
Reply With Quote
  #3  
Old 05-19-2016, 09:23 PM
ki0ho's Avatar
ki0ho ki0ho is offline
Silver Member
 
Join Date: Jan 2010
Location: lake of the Ozarks
Posts: 2,730
Thanks: 1,068
Thanked 400 Times in 248 Posts
ki0ho will become famous soon enough
Default Re: antenna lead got to close

A small lesson in RF theory..........try that at a 1000 watts....and realy have some fun!!!
__________________


01-20-17 Lord grant me Patience!
Shit Happens

Many will follow their depraved conduct and will bring the way of truth into disrepute.
Reply With Quote
  #4  
Old 05-20-2016, 09:49 AM
JimVT's Avatar
JimVT JimVT is offline
Bronze Member
 
Join Date: Oct 2005
Location: Enumclaw WA.
Posts: 3,349
Thanks: 4
Thanked 1,063 Times in 517 Posts
JimVT is on a distinguished road
Default Re: antenna lead got to close

I carry a fire extinguisher now and am careful. some testing is needed but I may go down to 25 watts.
if it burned more I wonder if it would have damaged the radio.
__________________
Jim KF7RiN
#185 snow trac
2004 pistenbully canyon
Reply With Quote
  #5  
Old 05-20-2016, 05:17 PM
road squawker's Avatar
road squawker road squawker is offline
Bronze Member
 
Join Date: Feb 2014
Posts: 1,167
Thanks: 914
Thanked 1,295 Times in 609 Posts
road squawker is on a distinguished road
Default Re: antenna lead got to close

Quote:
Originally Posted by JimVT View Post
...and am careful....
Yeah, the radiating antenna looks to be about a foot from your head

I don't think the RF power level is the issue, It looks like the coax was rubbed for a while and finally wore down to the braid.
Reply With Quote
  #6  
Old 05-20-2016, 05:53 PM
mbsieg's Avatar
mbsieg mbsieg is offline
awful member
 
Join Date: Oct 2006
Location: Worland WY
Posts: 3,146
Thanks: 135
Thanked 116 Times in 86 Posts
mbsieg is on a distinguished road
Default Re: antenna lead got to close

Please for the sake of those that love and care for you. http://hintlink.com/power_density.php
__________________
what a day........
Reply With Quote
  #7  
Old 05-20-2016, 09:03 PM
JimVT's Avatar
JimVT JimVT is offline
Bronze Member
 
Join Date: Oct 2005
Location: Enumclaw WA.
Posts: 3,349
Thanks: 4
Thanked 1,063 Times in 517 Posts
JimVT is on a distinguished road
Default Re: antenna lead got to close

looks like 5 watts would be ok.
__________________
Jim KF7RiN
#185 snow trac
2004 pistenbully canyon
Reply With Quote
  #8  
Old 05-23-2016, 12:57 PM
JimVT's Avatar
JimVT JimVT is offline
Bronze Member
 
Join Date: Oct 2005
Location: Enumclaw WA.
Posts: 3,349
Thanks: 4
Thanked 1,063 Times in 517 Posts
JimVT is on a distinguished road
Default Re: antenna lead got to close

I run this for my 5 watt handheld. I need to hold it 5ft from me to be safe.
Quote:
Originally Posted by mbsieg View Post
Please for the sake of those that love and care for you. http://hintlink.com/power_density.php
__________________
Jim KF7RiN
#185 snow trac
2004 pistenbully canyon
Reply With Quote
  #9  
Old 05-23-2016, 04:21 PM
road squawker's Avatar
road squawker road squawker is offline
Bronze Member
 
Join Date: Feb 2014
Posts: 1,167
Thanks: 914
Thanked 1,295 Times in 609 Posts
road squawker is on a distinguished road
Default Re: antenna lead got to close

Quote:
Originally Posted by JimVT View Post
looks like 5 watts would be ok.
actually, at power levels below 50 watts, all 2 meter FM operations are exempt, also, ALL mobile operations on any frequency are also exempted by bulletin 65.

but,..... I still would move or at least raise the antenna above the roofline.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Another antenna.... JEV Ham Radio Forum 0 09-15-2013 09:06 PM
I have a question about antenna... 300 H and H Ham Radio Forum 12 01-17-2013 02:37 PM
Homemade DTV Antenna Bobcat Computers, Cell Phones & Electronics Forum 31 11-30-2009 07:35 PM
I need an antenna nixon Computers, Cell Phones & Electronics Forum 13 06-10-2008 07:46 AM





All times are GMT -4. The time now is 12:15 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2002 - 2018 www.ForumsForums.com