Hits
The 20m coil-shortened shower rod dipole
If you've got a few old shower curtain rods hanging around you can build a low-cost 20m shower rod dipole antenna
post 05 Dec 2024
Antenna 20mt 14 Mhz Links →
A 20 Meter Half Square Antenna for QRP Portable Operation, KA1DDB
The half square is made of a two strand computer ribbon cable 100 feet long, 47 feet of which is used for the balanced feed line
An Hexagonal Beam in 3 hours
The HEX has a very small wingspan, but no loading coils or traps Therefore it does not have the losses associated with such devices It appears to perform much as a full size 2 element yagi, but with a better match to 50 Ohm coax, comparable gain and f/b, but with a bit less bandwidth Physically, it is very light and strong. It can be multibanded by nesting elements one inside the other, like a multi-band Quad
Antenna HF Portable for 20 meters
Here's an easily transportable vertical antenna for 20 meters collapsible to 4 feet
Bi-Plane Antenna for 20 Meters
A Bi-Plane antenna for 20 meters, tuned it up, and put it on the air. Resultsd indicate that it is working pretty well for a 3-feet long dipole-type antenna at 22 feet up
C-POLE portable antenna for 20mt
Dimensions of C-Pole Antenna for 20m, frequency 14.240 MHz verall wire length roughly 1/2 wavelength, feedpoint 25% from end, lectrically an off center fed dipole
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The half square is made of a two strand computer ribbon cable 100 feet long, 47 feet of which is used for the balanced feed line
The HEX has a very small wingspan, but no loading coils or traps Therefore it does not have the losses associated with such devices It appears to perform much as a full size 2 element yagi, but with a better match to 50 Ohm coax, comparable gain and f/b, but with a bit less bandwidth Physically, it is very light and strong. It can be multibanded by nesting elements one inside the other, like a multi-band Quad
Here's an easily transportable vertical antenna for 20 meters collapsible to 4 feet
A Bi-Plane antenna for 20 meters, tuned it up, and put it on the air. Resultsd indicate that it is working pretty well for a 3-feet long dipole-type antenna at 22 feet up
Dimensions of C-Pole Antenna for 20m, frequency 14.240 MHz verall wire length roughly 1/2 wavelength, feedpoint 25% from end, lectrically an off center fed dipole
PIC-Keyer This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62
RF Inductance Calculator Mean diameter of the air core coil, measured from conductor centre to conductor centre include the wire insulation thickness, if any
Voice Recorder Gestito dall'integrato in questione ed offre la possibilità di registrare più messaggi per una durata massima di un minuto con buona fedeltà di riproduzione