On 23 Feb 2005 08:11:47 -0800, "Dave" wrote:

Are there any online sources that show vertical whip antenna take-off
angles vs. antenna length (as a function of wavelength)?

Hi Dave,

Go to:
http://www.eznec.com/
and research to your heart's content with the simple designs (or make
your own).

Keeping the transmitter and reciever constant, what would you recommend
for the transmitting and receiving antennas in this case?

Inverted F comes to mind, but is not the total solution. Then there
is the quadrifilar helix antenna.
Visit:
http://home.iag.net/~w2du/Reflection...lixAntenna.pdf

73's
Richard Clark, KB7QHC

Richard Clark wrote:
On 23 Feb 2005 08:11:47 -0800, "Dave" wrote:

Are there any online sources that show vertical whip antenna
take-off
angles vs. antenna length (as a function of wavelength)?

Hi Dave,

Go to:
http://www.eznec.com/
and research to your heart's content with the simple designs (or make
your own).

Done and done... nice program! I'm hoping I entered the correct values
for everything. Do the patterns listed below look correct? I assumed
things like wire diameter (I used 2mm) didn't affect the output
significantly... although I did notice some things like the number of
segments did affect the output if I decreased them (I used 10 for these
cases).

(filename = length in wavelengths):

http://www.geocities.com/achilles03/eighth.gif
http://www.geocities.com/achilles03/quarter.gif
http://www.geocities.com/achilles03/half.gif
http://www.geocities.com/achilles03/5eighths.gif
http://www.geocities.com/achilles03/1wave.gif
http://www.geocities.com/achilles03/1point25wave.gif
http://www.geocities.com/achilles03/2.gif

Do those look correct?

Thanks in advance!
Dave

On 23 Feb 2005 09:53:05 -0800, "Dave" wrote:

Done and done... nice program! I'm hoping I entered the correct values
for everything. Do the patterns listed below look correct?

Hi Dave,

Yes, however, you will notice there is still a cone of silence above
any of these even if the preferred angle is now higher towards a
balloon.

I assumed
things like wire diameter (I used 2mm) didn't affect the output
significantly... although I did notice some things like the number of
segments did affect the output if I decreased them (I used 10 for these
cases).

Not so much that any change will fill in the cone.


73's
Richard Clark, KB7QHC