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RADIOHF - KAT500 Antenna Tuner Display Unit KAT500 Antenna Tuner Display — Real-Time OLED Monitor for Elecraft KAT500 Seven parameters, always visible, on a high-contrast 256×64 OLED. No menu cycling. Mount anywhere in the shack. Monitors: Mode (BYPASS / MANUAL / AUTO) · Antenna Port · Frequency Range SWR After · SWR Before L (µH) · C (pF) — auto-reordered to match your SIDE setting Frequency Range — the exact kHz bin the KAT500 is currently tuned to (e.g. 14200–14229) Direct RS-232 integration via MAX3232 — no tuner modification required. Specs: XIAO ESP32-C3 · SSD1322 256×64 OLED · 9–14.8V DC · 100mA · 4″×2″×4″ Bonus: Built-In WiFi — green phosphor web interface mirrors the OLED with color-coded SWR bars (amber >1.5:1, red >2.1:1). Web controls include Power, Mode, Antenna Port, and Full Tune. Fault alerts display instantly. OTA firmware updates — no USB required. OLED operates independently of WiFi at all times. Includes: Assembled & tested unit, DC power cable, RS-232 cable. $229 plus $10 shipping PP Listing #1762618 by KV5J Last Edited on 04/14/26 Submitted on 03/20/26 Web Site: http://www.kv5j.com Submitted from customer.mmmiflx1.isp.starlink.com Click to Contact Back to Previous Page

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