Antenna Case Study

Something you always wanted to know about antennas

Symmetrical High Power 50-144MHz Relay

Symmetrical High Power 50-144MHz Relay

Symmetrical High Power 50 – 144MHz Relay Intended to switch two equal antennas to QRO. Possible use is as H / V switch. Although relay will be perfect to switch antenna to QRO and preamplifier. Intention was for switching equal…

Read More
Cheap High Power 50 / 144 MHz Relay

Cheap High Power 50 / 144 MHz Relay

Cheap QRO Relay 50 / 144 MHz with high isolation Intended to switch antenna to QRO or preamplifier without need for another isolation relay. This relay is good enough to protect any sensitive preamplifier.Relay is good for VHF contests and…

Read More
Capacitor self resonant frequency SRF

Capacitor self resonant frequency SRF

Capacitor self resonant frequency SRF popular for amateur use We used 0805 and 1206 SMD capacitors, film capacitors and electrolytic capacitors with wire + VIA length about 2 to 4mm 680pF 0805 Series Resonant Frequency (SRF) wire – VIA length…

Read More
Inductor Self Resonant Frequency SRF

Inductor Self Resonant Frequency SRF

Inductor self resonant frequency SRF We measured Series Resonant Frequency “SRF” of some axial, SMD and hand wind inductors. Axial inductors like this one: Axial inductor 560nH Series Resonant Frequency SRF Axial inductor 1uH SRF Axial inductor 10uH Series Resonant…

Read More