Cheap QRO Relay 50 / 144 MHz with high isolation Intended to switch antenna to QRO or preamplifier without need for another isolation relay. This cheap QRO relay is good enough to protect any sensitive preamplifier. Relay is good for…
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 of High Power 50-144MHz Relay is…
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 Capacitor self resonant frequency testing: 680pF 0805 Series Resonant Frequency…
Inductor self resonant frequency SRF We measured Series Resonant Frequency “SRF” of some axial, SMD and hand wind inductors. The self resonant frequency of an inductor is the frequency at which the parasitic capacitance of the inductor resonates with the…
