An eggbeater Antenna - For NOAA weather satellite .
FODtrack Rotator interface with AZ/EL driving relays
Used with a modified CCTV Camera Rotator
as on next photo.
Used with a modified CCTV Camera Rotator
as on next photo.
UHF/VHF cross Yagi antennas with changeable circular polarization coax phase lines
and remote control DC switches.
The rotor mod include adding a voltage feedback potentiometers.
The AZ-Pot connected mechanically to AZ moving part.
The EL-pot driven by a hanging weight ( NUT) to the gravity .
and remote control DC switches.
The rotor mod include adding a voltage feedback potentiometers.
The AZ-Pot connected mechanically to AZ moving part.
The EL-pot driven by a hanging weight ( NUT) to the gravity .
High gain UHF Yagi with cross elements and switching circular polarization
RHCP/LHCP
The VHF Pre-Amp - Transistor was BF981
On services since 10 years
No TR/RX relay . peaked to 137 MHz for receiving the weather satellite .
On services since 10 years
No TR/RX relay . peaked to 137 MHz for receiving the weather satellite .
CI-V interface built on perforated PCB - with external DC power supply
PC sound card interfacing
later 1:1 isolation transformers were added
VHF/UHF on single boom