"professorpaul" wrote in message
...
On Aug 7, 5:03 pm, Cecil Moore wrote:
Helmut Wabnig wrote:
The LPDA is "self-adjusting" and easy to make.
And you may change frequency any time.

Question is: Why would an amateur radio operator
want to cover 148 MHz to 420 MHz with a transmitting
antenna?
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com

I only want to cover 144 and 420, nothing in between! Just for LEO
satellites, where the uplink is on 144 and the downlink is 420, or vis
versa.

/paul W3FIS

Hi Paul

AO-51 is a good HAM satellite. It is 146 up and 435 down.
If you do want to get some good experience designing Log Periodic
antennas, you might consider a Log Periodic V. The V configuration takes
advantage of a three to one frequency spread, where a center fed 1/2 wave
dipole becomes 3/4 wave at 3 times the frequency. The low frequencie
pattern is little effected by the "V". The high frequencies (3 times the
low frequencies) appreciate the bending to the V because that allows the
sidelobes to add toward the "front".

Jerry KD6JDJ