HF Transmitter #09 - Directional Coupler, LPF & Antenna Relay
Immediately downstream of the final power amp, I'm adding a LPF (low pass filter), a directional coupler, and an antenna relay - all on a common printed circuit board. The directional coupler will allow me to measure forward and reflected RF power, so that I can calculate in the Arduino software the transmitted power and the standing wave ratio (SWR). No endorsement is made nor implied to any commercial products referenced in this episode.
▶︎
HF Transmitter #10 - Low Pass Filter
▶︎
#1478 RF Coupler Construction
▶︎
#196: How a Directional Coupler in an SWR meter works
▶︎
#1470 Using RF Couplers for Return Loss Measurment
▶︎
40dB attenuator and tap box
▶︎
#158: Directional Coupler Basics & how to sweep SWR of an antenna | Return Loss | VSWR
▶︎
HF Transmitter #01 - Project Intro
▶︎
Most Ridiculous Worker Mistakes Caught on Camera
▶︎
Building a 2A3 DHT SET Power Amplifier
▶︎
I Spent 20 Days Building the Cheapest Forest House Alone to Live: Solo Bushcraft (Full)
▶︎
RF Splitters & Combiners - How do they work?
▶︎
Homebrew PWR/SWR Meter: Part 3 - Tandem Coupler Experiments
▶︎
Nothing about the honey badger is normal... and here is why
▶︎
I Found the Secret to WiFi Antennas!
▶︎
2kW Directional Coupler for LDMOS Amlifiers
▶︎
Unbelievable Smart Worker & Hilarious Fails | Construction Compilation #8 #adamrose #smartworkers
▶︎
More range on 2m for under €10 – this antenna is surprising
▶︎
Ecuador vs. Germany Highlights FIFA World Cup 2026 | Sportschau
▶︎