Hits
40-15m antenna Sloper
The tower guy wires could be used as additional antenna radiators. The antenna that most suited this application was a 40m band sloper as the guy wire to be used was slightly longer than a 1/4 wave length at 7 MHz
post 07 May 2024
Antenna Vertical Links →
Single 5/8 Flower Pot Antenna
Construction of the Single 5/8, whilst a little more involved than the basic half-wave antenna, is again fairly simple
Self's building of a HF2V, vertical antenna for 40 and 80m
First I regarded the antiresonant circuit Groundplane. There the antiresonant circuit comes to a 1/4 wavelength, related to the higher operating frequency 7 MHz
Semi-vertical Trap Antenna for 1.8 MHz, 3.5MHz and 7.0MHz
Having made many contacts around the World using the Tri-Band Trapped Dipole 18MHz, 24MHz and 50MHz, John decided to add extra Traps in order to include 14MHz, 21MHz and 28MHz
185
Construction of the Single 5/8, whilst a little more involved than the basic half-wave antenna, is again fairly simple
First I regarded the antiresonant circuit Groundplane. There the antiresonant circuit comes to a 1/4 wavelength, related to the higher operating frequency 7 MHz
Having made many contacts around the World using the Tri-Band Trapped Dipole 18MHz, 24MHz and 50MHz, John decided to add extra Traps in order to include 14MHz, 21MHz and 28MHz
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground