# 9A5N Keyer BT Companion — Pocket Serial Data Terminal

> Pocket Serial Data Terminal (iPhone/iPad app by Andre Tobisch.)

- Source: https://appshunter.io/ios/app/9a5n-keyer-bt-companion/id6789400306 (this page in markdown: same URL + `.md`)
- Developer: [Andre Tobisch](https://appshunter.io/developer/841681922)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 17 MB
- Languages: American English
- Released: 2026-10-23
- Data updated: 2026-10-25

## What is 9A5N Keyer BT Companion?

9A5N Keyer BT Companion — Bluetooth pocket terminal for the 9A5N QRQ Keyer and 9A5N PicoKeyer. Live, bidirectional control of every firmware parameter, a hardware-tailored on-screen CW keyboard, a text-to-Morse Send screen, and a Receive terminal designed for CW practice.

HIGHLIGHTS

- BLUETOOTH LOW ENERGY — connects to your keyer over BLE and shows BLE in the status badge. Long-message chunking is handled transparently.

- HARDWARE-AWARE UI — connect to a QRQ Keyer and the full Settings UI (side tone, beacon, Farnsworth, oscillator, PA tune) appears. Connect to a PicoKeyer and the app hides controls the firmware doesn't implement; the Memory screen swaps to a "no message memory on this hardware" placeholder. The title bar animates between "9A5N KEYER", "9A5N QRQ KEYER", and "9A5N PICOKEYER" as you switch hardware.

- LIVE BIDIRECTIONAL SYNC — turn the SPEED knob on the keyer and the slider in the app moves with it. Every slider is commit-gated: the value goes out exactly once on release, never spammed mid-drag.

- 9A5N CW KEYBOARD — custom on-screen keyboard built for ham operators, replaces the system keyboard inside the app. Morse code hint under every letter and digit, ALL-CAPS by default, always-visible digit row, prosigns one tap away ([AR], [BT], [SK], [KN], [DM]), clipboard PASTE with 7-bit-ASCII filter. No autocorrect, no emoji, no language switcher.

- MEMORIES (QRQ Keyer) — RAM buffer + 5 EEPROM slots, one-tap save-to-slot, pulsing beacon-source badge on slot 1, atomic delete-and-overwrite, 1024 chars per slot.

- SEND SCREEN — type CW, watch the live TX countdown, see your payload as a Morse pulse. Operator-editable quick macros and prosigns. Drafts persist when the app is closed.

- RECEIVE TERMINAL — read-only terminal that streams everything the keyer transmits back. Wipes on every entry so each drill starts on a clean buffer. Phosphor-CRT rendering, optional per-line timestamps, hex-dump view, font zoom, typewriter-paced reveal.

- EVERY MANUAL COMMAND — speed, pot range, keying mode (Iambic A/B, Ultimatic, Bug, Straight on QRQ Keyer), 23 side-tone frequencies, auto-space, dot/dash invert, Farnsworth, beacon, ±32 oscillator trim, PA-tune. PicoKeyer surfaces a documented subset.

- AMATEUR-RADIO-NATIVE UI — dark phosphor-green theme, monospace readouts, oscilloscope intro that keys "9A5N" in actual Morse, CRT scanlines, S-meter status. Honours iOS Reduce Motion and Dynamic Type.

HARDWARE

Designed exclusively for the 9A5N keyer hardware family. Will not connect to other CW keyers or generic Bluetooth peripherals. The iOS app works over Bluetooth Low Energy only, so Bluetooth Classic (SPP) units are not supported.

- 9A5N QRQ Keyer — BLE (GATT FFE0 / FFE1, JDY-33-BLE). Full command set + 1 RAM and 5 EEPROM memory slots.

- 9A5N PicoKeyer — BLE. Reduced command set: speed, speed range, mode, auto-space, key invert, CW-out. No on-device memory, side tone, beacon, Farnsworth, or oscillator calibration.

Bundled keyer manual ships as a PDF inside the app.

73 de 9A5N

## Is 9A5N Keyer BT Companion safe?

Not enough ratings yet to assess 9A5N Keyer BT Companion.

## Is 9A5N Keyer BT Companion legit?

9A5N Keyer BT Companion appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for 9A5N Keyer BT Companion is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 0.1.0 — 2026-10-23

No release notes.

## More apps by Andre Tobisch

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- [Science Fiction Quiz](https://appshunter.io/ios/app/science-fiction-quiz/id914409792)
- [ABC Letters Mania Brain Game](https://appshunter.io/ios/app/abc-letters-mania-brain-game/id982223224)
- [XD - Tic Tac](https://appshunter.io/ios/app/xd-tic-tac/id1011794555)
- [Sudoku Super Brain Challenge](https://appshunter.io/ios/app/sudoku-super-brain-challenge/id1031033640)

All apps by Andre Tobisch: https://appshunter.io/developer/841681922

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*