A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Home Built
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

antenna length



 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #5  
Old March 31st 05, 06:25 AM
UltraJohn
external usenet poster
 
Posts: n/a
Default

Smitty wrote:

The wavelength times the frequency equals the speed of light. (radio
frequency waves travel at the speed of light.) Make the antenna
proportional to 1 wavelength. 1/4 wave antennas are common, but you can
make them half wave or full wave or 1/8 wave or whatever you have room
for.


Sure you can make your antenna any length you want. . . It's just that some
work great and others don't work worth a d#$n. I don't think your 1/8
wavelength antenna will do all that well. Use the K.I.S.S formula and make
either a 1/4 groundplane or 1/2 wave dipole. Jim's formula's work great,
figure out what length you need from what he said then cut it a bit long
hook up a SWR bridge to it. Check SWR at low end and high end of band trim
the antenna a little and when the high end starts to get a smidgeon better
than the low end stop, your there.
John
wd8ope, wa4fms, kg4jp, kg6jp and now kc5vb.

 




Thread Tools
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

vB 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
Retractable Comm Antenna Ron Wanttaja Home Built 11 September 6th 04 07:59 PM
ELT antenna -- Pitts Al MacDonald Home Built 0 July 15th 04 04:27 PM
Ext antenna connection for handheld radio Ray Andraka Owning 7 March 5th 04 02:10 PM
comm's RX antenna acepilot Home Built 5 March 3rd 04 06:34 PM
LS-4 Transponder antenna location? Matt Herron Soaring 3 February 25th 04 04:45 PM


All times are GMT +1. The time now is 05:31 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 AviationBanter.
The comments are property of their posters.