KP4MD

@UCbdE4cv0_p1hGXdurTghJ8w - 1.3K subscribers

Amateur Radio Station KP4MD video channel. Tropospheric radio propagation studies. Software defined radio, satellite and digital communication technology and antenna design, construction and analysis.

Home Videos Live Playlists

Rpitx's 10 mW 7038 kHz test signal heard in Point Reyes, CA

Rpitx's 10 mW 7038 kHz test signal heard in Point Reyes, CA KP4MD

59 views - 2 weeks ago

K6ARK Mini Microphones - Comparison of Microphone Elements with QRP-Labs QMX+ Transceiver

K6ARK Mini Microphones - Comparison of Microphone Elements with QRP-Labs QMX+ Transceiver KP4MD

232 views - 1 month ago

Arduino Morse Code Flasher Beacon

Arduino Morse Code Flasher Beacon KP4MD

45 views - 1 month ago

Arduino Morse Code Flasher Beacon

Arduino Morse Code Flasher Beacon KP4MD

125 views - 3 months ago

Arduino Nano Si5351 VFO & Keyer Sketch v2.3.0 for the Tuna Tin "S" Transmitter

Arduino Nano Si5351 VFO & Keyer Sketch v2.3.0 for the Tuna Tin "S" Transmitter KP4MD

467 views - 4 months ago

2025 ARRL Field Day with NP3VI on Vieques Island

2025 ARRL Field Day with NP3VI on Vieques Island KP4MD

259 views - 9 months ago

QRP-Labs QMX 750 Hz Tone in Beacon Modes

QRP-Labs QMX 750 Hz Tone in Beacon Modes KP4MD

489 views - 1 year ago

QMX+ IQ Output to NaP3 SDR Software - SSB Panadapter & Waterfall

QMX+ IQ Output to NaP3 SDR Software - SSB Panadapter & Waterfall KP4MD

705 views - 1 year ago

QMX+ IQ Output to NaP3 SDR Software - CW Panadapter & Waterfall

QMX+ IQ Output to NaP3 SDR Software - CW Panadapter & Waterfall KP4MD

1.4K views - 1 year ago

QRP-Labs QMX+ GPS Viewer

QRP-Labs QMX+ GPS Viewer KP4MD

417 views - 1 year ago

QRP-Labs QMX+ Transceiver First Contact

QRP-Labs QMX+ Transceiver First Contact KP4MD

5.7K views - 1 year ago

Pi Pico RX with 10 dB LNA Reception on 7208 kHz LSB, 05 JAN 2025

Pi Pico RX with 10 dB LNA Reception on 7208 kHz LSB, 05 JAN 2025 KP4MD

1.2K views - 1 year ago

Pi Pico RX Reception of Roundtable Net on 7181 kHz LSB, 21 DEC 2024

Pi Pico RX Reception of Roundtable Net on 7181 kHz LSB, 21 DEC 2024 KP4MD

766 views - 1 year ago

Pi Pico RX Reception in CW Mode

Pi Pico RX Reception in CW Mode KP4MD

1.1K views - 1 year ago

Pi Pico RX Reception of WWV & WWVH on 15 MHz

Pi Pico RX Reception of WWV & WWVH on 15 MHz KP4MD

922 views - 1 year ago

Tuna Tin "S" Transmitter at 7 Watts

Tuna Tin "S" Transmitter at 7 Watts KP4MD

179 views - 1 year ago

KP4MD/P Station in Puerto Rico July 2024

KP4MD/P Station in Puerto Rico July 2024 KP4MD

290 views - 1 year ago

K5TRA Attic HF/VHF/UHF Antenna Farm Jan 2020

K5TRA Attic HF/VHF/UHF Antenna Farm Jan 2020 KP4MD

3.3K views - 2 years ago

Roman's Pixie QRP Transceiver

Roman's Pixie QRP Transceiver KP4MD

343 views - 2 years ago

AA6GA heard on 3544 kHz with Buddistick Antenna.

AA6GA heard on 3544 kHz with Buddistick Antenna. KP4MD

152 views - 2 years ago

Why Set Up a WebSDR with OpenWebRX?

Why Set Up a WebSDR with OpenWebRX? KP4MD

3.6K views - 2 years ago

LA4ZCA's 3D Printed Telegraph Key

LA4ZCA's 3D Printed Telegraph Key KP4MD

381 views - 2 years ago

Comparison of 28 MHz Antenna Radiation Patterns: 40m Loop Skywire vs. 1/4 Wave Vertical

Comparison of 28 MHz Antenna Radiation Patterns: 40m Loop Skywire vs. 1/4 Wave Vertical KP4MD

412 views - 3 years ago

KJ6KO CW Beacon on 222.015 MHz - 11 Feb 2023

KJ6KO CW Beacon on 222.015 MHz - 11 Feb 2023 KP4MD

90 views - 3 years ago

Spectrum Analyzer tracks Ruud RA-1630 Air Conditioner Radio Interference (EMI)

Spectrum Analyzer tracks Ruud RA-1630 Air Conditioner Radio Interference (EMI) KP4MD

261 views - 3 years ago

TinySA Spectrum Analyzer tracks Ruud Air Conditioner RFI

TinySA Spectrum Analyzer tracks Ruud Air Conditioner RFI KP4MD

550 views - 3 years ago

Ruud RA-1630 Air Conditioner (HVAC) Radio Interference (EMI/RFI)

Ruud RA-1630 Air Conditioner (HVAC) Radio Interference (EMI/RFI) KP4MD

612 views - 3 years ago

5.8 GHz Quadcopter Extender Antenna Comparison

5.8 GHz Quadcopter Extender Antenna Comparison KP4MD

327 views - 4 years ago

The 5 8 GHz ParaYagi P2 Extender 4nec2 Antenna Model

The 5 8 GHz ParaYagi P2 Extender 4nec2 Antenna Model KP4MD

258 views - 4 years ago

10 meter FM Audio Clip Report from KB3AWQ

10 meter FM Audio Clip Report from KB3AWQ KP4MD

100 views - 4 years ago

15 January 2022 Tonga Volcano Explosion Record 200,000 Lightning Strikes Map

15 January 2022 Tonga Volcano Explosion Record 200,000 Lightning Strikes Map KP4MD

344 views - 4 years ago

Radio Grinch KP4MD

368 views - 4 years ago

Begali Keys - High Speed Test

Begali Keys - High Speed Test KP4MD

5.3K views - 4 years ago

Dual Band Tuna Tin S On the Air Test - 5 MHz and 7 MHz

Dual Band Tuna Tin S On the Air Test - 5 MHz and 7 MHz KP4MD

173 views - 4 years ago

Tuna Tin S Synthesizer Test

Tuna Tin S Synthesizer Test KP4MD

168 views - 4 years ago

Tuna Tin S Transmitter Test

Tuna Tin S Transmitter Test KP4MD

216 views - 4 years ago

Arduino Si5351 VFO Sketch v2.0.0 for the Tuna Tin "S" Transmitter

Arduino Si5351 VFO Sketch v2.0.0 for the Tuna Tin "S" Transmitter KP4MD

839 views - 4 years ago

HAARP-LWA Moonbounce Experiment - January 20, 2008

HAARP-LWA Moonbounce Experiment - January 20, 2008 KP4MD

638 views - 4 years ago

HamClock Software for Raspberry Pi by WBØOEW

HamClock Software for Raspberry Pi by WBØOEW KP4MD

458 views - 4 years ago

EchoLink Setup & AllStar Demonstration

EchoLink Setup & AllStar Demonstration KP4MD

10.3K views - 4 years ago

Breakfast with Gordon West WB6NOA at the 2021 ARRL Pacificon Convention

Breakfast with Gordon West WB6NOA at the 2021 ARRL Pacificon Convention KP4MD

183 views - 4 years ago

Fixing a Chinese "QRP Manual Days" Antenna Tuner Kit

Fixing a Chinese "QRP Manual Days" Antenna Tuner Kit KP4MD

17.1K views - 4 years ago

UT5JCW 222 MHz Transverter Frequency Drift from Cold Start

UT5JCW 222 MHz Transverter Frequency Drift from Cold Start KP4MD

341 views - 4 years ago

Radiation Patterns of Tarheel 100A-HP Antenna

Radiation Patterns of Tarheel 100A-HP Antenna KP4MD

402 views - 4 years ago

Micro-TO Mk II and an Alinco DX-70TH

Micro-TO Mk II and an Alinco DX-70TH KP4MD

418 views - 4 years ago

A 23 cm Biquad 4nec2 Antenna Model

A 23 cm Biquad 4nec2 Antenna Model KP4MD

863 views - 5 years ago

Panorama View at 20 and 100 feet at ARS KP4MD

Panorama View at 20 and 100 feet at ARS KP4MD KP4MD

79 views - 5 years ago

KiwiSDR $4 Cooling Fan Failure

KiwiSDR $4 Cooling Fan Failure KP4MD

273 views - 5 years ago

Retevis RT98U UHF Mobile Radio

Retevis RT98U UHF Mobile Radio KP4MD

1.2K views - 5 years ago

27415 kHz USB heard on the KiwiSDR in Citrus Heights, California

27415 kHz USB heard on the KiwiSDR in Citrus Heights, California KP4MD

280 views - 5 years ago

Add an Ozone Generator to an Air Purifier

Add an Ozone Generator to an Air Purifier KP4MD

4.9K views - 6 years ago

KP4MD/P Station in Puerto Rico - July 2019

KP4MD/P Station in Puerto Rico - July 2019 KP4MD

653 views - 6 years ago

Japanese Hi-Mound BK-100 Semi-automatic Telegraph Key

Japanese Hi-Mound BK-100 Semi-automatic Telegraph Key KP4MD

4.4K views - 6 years ago

Loop SkyWire 7 MHz Radiation Pattern (with house)

Loop SkyWire 7 MHz Radiation Pattern (with house) KP4MD

251 views - 7 years ago

Loop SkyWire 7 MHz Radiation Pattern

Loop SkyWire 7 MHz Radiation Pattern KP4MD

566 views - 7 years ago

Loop SkyWire 14 MHz Radiation Pattern (with house)

Loop SkyWire 14 MHz Radiation Pattern (with house) KP4MD

523 views - 7 years ago

Loop SkyWire 14 MHz Radiation Pattern

Loop SkyWire 14 MHz Radiation Pattern KP4MD

347 views - 7 years ago

Tarheel 100A-HP 4nec2 Antenna Model

Tarheel 100A-HP 4nec2 Antenna Model KP4MD

542 views - 7 years ago

Chris Fallen KL3WX: "Global Ionosphere Model Validation Using HAARP and WSPR"

Chris Fallen KL3WX: "Global Ionosphere Model Validation Using HAARP and WSPR" KP4MD

11.5K views - 7 years ago

KP4MD/P 7 MHz Propagation July 2019

KP4MD/P 7 MHz Propagation July 2019 KP4MD

124 views - 7 years ago