| Author |
Message |
    
Climber
| | Posted on Monday, December 29, 2003 - 10:52 pm: | 
|
Hello,
Building a home-made GMRS mobile roof antenna. What is that formula to calculate antenna length when you know transmitting freq?
Thanks to them who have not yet forgotten this stuff,unlike me.
Climber |
Ca346
| | Posted on Tuesday, December 30, 2003 - 12:56 pm: |
|
If you want the formula for a FULL WAVE length, here you go:
Full Wave Length(Feet)=983.6/Frequency
For example, x=983.6/27.385MHz
X=35.92 Feet
so, 5/8 wave length=.625x35.92 or 22.45 feet |
Ca346
| | Posted on Tuesday, December 30, 2003 - 12:59 pm: |
|
Sorry, wasn't paying attention to the actual question...
here's a better example: same formula
Full wave (feet)=983.6/146.94MHz
X=6.69 feet
1/2 of X= 3.35 feet
1/4 of X= 1.67 feet |
Barracuda
| | Posted on Tuesday, December 30, 2003 - 3:27 pm: |
|
GMRS is in the 462 & 467 Mhz range, isn't it? |
Bruce
| | Posted on Wednesday, December 31, 2003 - 12:38 am: |
|
gmrs
462.550 467.550
462.575 467.575
462.600 467.600
462.625 467.625
462.650 467.650
462.675 467.675
462.700 467.700
462.725 467.725 |
Viking
| | Posted on Friday, January 02, 2004 - 4:56 pm: |
|
How about using a uhf TV antenna? |
Bruce
| | Posted on Friday, January 02, 2004 - 11:01 pm: |
|
they are cut a tad too high but will work my antenna of choice is a gain coliner like this i have one
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3067629614&category=4672
|
Climber
| | Posted on Saturday, January 03, 2004 - 9:57 pm: |
|
CA346, Viking, Bruce, and Barracuda,
This is the place for assistance on anything Radio, nice to know some help exists in a "what's in it for me world".
Climber |
Bruce
| | Posted on Sunday, January 04, 2004 - 2:11 am: |
|
thats what im here for to HELP! |
|
