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AMPHF - KPA500 RF Power Monitor KPA500 RF Power Monitor — Real-Time OLED Display for Elecraft KPA500 Six critical parameters, always visible, updating 10×/second on a high-contrast 256×64 OLED. No menu cycling. No squinting. Monitors: Power Output (0–700W) · PA Voltage · PA Current · SWR · PA Temperature · Band + Operate/Standby 3×2 grid layout — large fonts sized for quick reading across the shack. Direct RS-232 integration via MAX3232 — no amplifier modification required. Specs: XIAO ESP32-C3 · SSD1322 256×64 OLED · 9–14.8V DC · 100mA · 10 Hz update rate · 4″ × 2″ × 4″ Free Bonus: Built-In WiFi — web interface mirrors the OLED with a retro green-on-black aesthetic, updated via WebSocket. Includes Power, Operate/Standby, Fan Speed, and Band controls plus OTA firmware updates. Access via kpa500.local — no app required. OLED operates independently of WiFi at all times. Includes: Assembled & tested unit, DC power cable, RS-232 cable, quick start guide. --$229 plus $10 shipping Listing #1765967 by KV5J Submitted on 04/24/26 Web Site: http://www.kv5j.com Submitted from mobile-107-77-199-165.mobile.att.net Click to Contact Back to Previous Page

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