Hits
Development of a 23cm patch antenna
Looking for a robust design for a portable antenna to use with my new DJ-G7E, I decided to try a microstrip patch.This is just a precisely-shaped conductive plate suspended above a ground-plane; but by using PCB techniques, this becomes a simple rectangular "flat-panel" antenna
post 23 Apr 2024
Antenna 23cm 1.2 GHz Links →
1.2 GHz FM Wireless SpyCam
This camera did not include audio, but the circuit board is obviously the same one used for cameras with a mic
10 GHz waveguide slot antenna
A slotted waveguide antenna works by radiating energy from the inside though a number of slots cut in the waveguide
10 Elements Yagi Directional Antenna for 23cm
For ATV transmission in the 23cm band from our club station
20-turn helix antenna for 23 cm
Design of a 10 GHz beacon antenna. A standard WG16 waveguide is used
23 cm Hybrid-Quad von
Some time ago I experimented with double quad antennas in the 23cm band, and I found that the resulting gain in terms of material expenditure is very large, and the broadband nature of such antennas for ATVs is almost the same
60
This camera did not include audio, but the circuit board is obviously the same one used for cameras with a mic
A slotted waveguide antenna works by radiating energy from the inside though a number of slots cut in the waveguide
For ATV transmission in the 23cm band from our club station
Design of a 10 GHz beacon antenna. A standard WG16 waveguide is used
Some time ago I experimented with double quad antennas in the 23cm band, and I found that the resulting gain in terms of material expenditure is very large, and the broadband nature of such antennas for ATVs is almost the same
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