[Elecraft] KPA1500 display add-on

[Keith Ennis]

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K V 5 J
Built by hams | For hams
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OLED DISPLAY SYSTEMS FOR ELECRAFT EQUIPMENT
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Real-time RF power, SWR, temperature, and amplifier status — displayed on a
crisp 256x64 OLED screen mounted directly to your Elecraft equipment. No more
squinting at front-panel meters or walking across the shack to check band
conditions.




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PRODUCTS
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KPA500 RF Power Monitor [Model KPA500]
Displays forward power, PA voltage, PA current, SWR, temperature, and band
— live, at a glance. Peak-hold power display with bar graphs for every
channel.


KAT500 Antenna Tuner Display [Model KAT500]
Shows mode, antenna, band, SWR before and after tuning, plus L and C values
with side indicator. Instant visual confirmation that your tuner is doing
its job.


W2 Wattmeter Display [Model W2]
Plug-in OLED upgrade for the Elecraft W2 Wattmeter. Displays forward power,
reflected power, SWR, and more with variable decimal precision.


KPA1500 Amplifier Monitor [Model KPA1500]
Monitors the big iron — forward power up to 1500W, PA voltage, PA current,
SWR, temperature, and band. Full web control panel included.




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WHAT YOU SEE ON THE DISPLAY FOR THE KPA1500
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The 256x64 OLED presents six channels in a 3x2 grid:


+---------------+---------------+---------------+
| POWER | VOLTS | AMPS |
| 847 W |||| | 51.0 V ||| | 16 A |||| |
+---------------+---------------+---------------+
| SWR | TEMP | BAND |
| 1.2:1 | | 44C ||| | 20M OPR |
+---------------+---------------+---------------+
WiFi ^


Each cell shows a label, current value, and a proportional bar graph.
The WiFi indicator appears top-right when connected.
OPR/STBY appears in the BAND cell to show amplifier mode at a glance.




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KEY FEATURES
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Live Serial Data
Reads directly from your Elecraft equipment via RS-232 through an onboard
MAX3232 interface. No extra hardware needed.


Peak Hold
Peak power hold with configurable decay time. See your true output power
even during brief SSB peaks.


Always On
OLED runs at full speed from power-up. No waiting for WiFi. The display
is never affected by network state.


OTA Updates
Firmware updates delivered over your network. No USB cable needed after
the initial setup.




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HARDWARE SPECIFICATIONS
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 Processor XIAO ESP32 — WiFi 6, Bluetooth 5
Display 256x64 SSD1322 OLED — Hardware SPI
Serial Interface MAX3232 RS-232 — 38400 baud, 8N1
 Power Input 13.8V DC from Elecraft accessory port
Power Draw Less than 200mA typical
Operating Temp -20C to +70C




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BUILT-IN WiFi WEB INTERFACE — FREE ADD-ON
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Every display unit ships with a full-featured web control panel at no extra
charge. Connect from any device on your network — phone, tablet, or laptop —
and monitor or control your station remotely. No app to install. No
subscription. No cloud. Just open a browser.


Web Interface Features:
▸ Real-time meter display
▸ Power ON / OFF control
▸ Operate / Standby toggle
▸ Band selection
▸ Fan speed control
▸ ATU Tune / IN / Bypass
▸ Fault detection and clear
▸ Remote OTA firmware update
▸ Tailscale remote access support
▸ Works on local network or internet




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ORDER TODAY
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Visit us at: kv5j.com


 Questions? DDUinfo at yahoo.com




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Copyright 2026 KeKaBu LLC | KV5J | Monroe, Louisiana
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Keith, KV5J