Fleetwood Digital
APRS-K1 Audio Interface Cable for Handheld Ham Radios K1 2-Pin Mic Connector (TNC, Zello & Recording)
APRS-K1 Audio Interface Cable for Handheld Ham Radios K1 2-Pin Mic Connector (TNC, Zello & Recording)
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Quick Specs
Quick Specs
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The APRS-K1 Audio Interface Cable bridges standard two-way radios with your Android, iOS, or Windows devices. By turning your smartphone, tablet, or laptop into a virtual Terminal Node Controller (TNC), this cable enables APRS beaconing, SSTV decoding/transmitting, Zello Radio-over-IP (RoIP) gateway links, and safe two-way audio recording without the expense of standalone modem hardware. Unlike cables found on marketplaces, Fleetwood Digital includes a 4 page users guide to help get you up & running.
🛡️ Built-In Inline Attenuation Circuit
Two-way radios output high-voltage audio designed for driving loudspeakers, which can easily distort or damage a smartphone's delicate microphone input. The integrated inline circuit housing contains a specialized resistor network that attenuates speaker-level audio down to a safe, clean microphone-level signal while ensuring proper impedance matching for flawless AFSK packet decoding.
🔄 Universal Reverse Connector Adapter Included (OMTP vs. CTIA)
The native 3.5mm TRRS jack is wired to the modern CTIA standard (used by Apple and most Android devices). To prevent wiring mismatches on older devices or alternative hardware, every cable includes a reverse connector adapter that instantly swaps the Ground and Mic lines to the OMTP standard for universal compatibility.
Key Applications & Performance Highlights
-
📍
Virtual TNC for APRS Use apps like APRSDroid to send your GPS coordinates and receive real-time tactical packet data over standard RF frequencies.
-
🌐
Zello RoIP Gateway Bridge Cross-link local RF frequencies directly to an internet-based Zello channel via VOX to build an affordable field gateway.
-
🎙️
Safe Radio Dispatch Recording Capture clean, attenuated radio communications directly into Audacity, voice recorders, or dispatch logging software without audio clipping.
-
🔌
Standard 2-Pin K-Type Connector Directly compatible with Baofeng, Kenwood, Retevis, TYT, Wouxun, and other standard 2-pin handhelds.
Technical Specifications
| Radio Connector | Standard 2-Pin K-Type (Kenwood / Baofeng standard) |
|---|---|
| Device Connector | 3.5mm TRRS (Gold-Plated, CTIA Standard) |
| Circuit Type | Passive Inline Attenuation & Impedance Matching Network |
| Cable Length | Approx. 1.0 – 1.2 Meters |
| Operating System Support | Android, iOS, Windows, Linux |
| Supported Applications | APRSDroid, Zello, Dire Wolf, Soundmodem, QSSTV, Audacity |
| Included Accessories |
1x APRS-K1 Cable, 1x OMTP-to-CTIA Reverse Adapter, 4 page users guide. Pictured Radio and Tablet are NOT included. |
⚠️ USB-C & Lightning Adapter Requirement
If your mobile device does not have a dedicated 3.5mm headphone jack, you must use an active, certified USB-C or Lightning audio adapter that explicitly supports microphone input (TRRS). Charge-only or listen-only dongles will not pass transmit/receive data.
Description
The APRS-K1 Audio Interface Cable bridges standard two-way radios with your Android, iOS, or Windows devices. By turning your smartphone, tablet, or laptop into a virtual Terminal Node Controller (TNC), this cable enables APRS beaconing, SSTV decoding/transmitting, Zello Radio-over-IP (RoIP) gateway links, and safe two-way audio recording without the expense of standalone modem hardware. Unlike cables found on marketplaces, Fleetwood Digital includes a 4 page users guide to help get you up & running.
🛡️ Built-In Inline Attenuation Circuit
Two-way radios output high-voltage audio designed for driving loudspeakers, which can easily distort or damage a smartphone's delicate microphone input. The integrated inline circuit housing contains a specialized resistor network that attenuates speaker-level audio down to a safe, clean microphone-level signal while ensuring proper impedance matching for flawless AFSK packet decoding.
🔄 Universal Reverse Connector Adapter Included (OMTP vs. CTIA)
The native 3.5mm TRRS jack is wired to the modern CTIA standard (used by Apple and most Android devices). To prevent wiring mismatches on older devices or alternative hardware, every cable includes a reverse connector adapter that instantly swaps the Ground and Mic lines to the OMTP standard for universal compatibility.
Key Applications & Performance Highlights
-
📍
Virtual TNC for APRS Use apps like APRSDroid to send your GPS coordinates and receive real-time tactical packet data over standard RF frequencies.
-
🌐
Zello RoIP Gateway Bridge Cross-link local RF frequencies directly to an internet-based Zello channel via VOX to build an affordable field gateway.
-
🎙️
Safe Radio Dispatch Recording Capture clean, attenuated radio communications directly into Audacity, voice recorders, or dispatch logging software without audio clipping.
-
🔌
Standard 2-Pin K-Type Connector Directly compatible with Baofeng, Kenwood, Retevis, TYT, Wouxun, and other standard 2-pin handhelds.
Technical Specifications
| Radio Connector | Standard 2-Pin K-Type (Kenwood / Baofeng standard) |
|---|---|
| Device Connector | 3.5mm TRRS (Gold-Plated, CTIA Standard) |
| Circuit Type | Passive Inline Attenuation & Impedance Matching Network |
| Cable Length | Approx. 1.0 – 1.2 Meters |
| Operating System Support | Android, iOS, Windows, Linux |
| Supported Applications | APRSDroid, Zello, Dire Wolf, Soundmodem, QSSTV, Audacity |
| Included Accessories |
1x APRS-K1 Cable, 1x OMTP-to-CTIA Reverse Adapter, 4 page users guide. Pictured Radio and Tablet are NOT included. |
⚠️ USB-C & Lightning Adapter Requirement
If your mobile device does not have a dedicated 3.5mm headphone jack, you must use an active, certified USB-C or Lightning audio adapter that explicitly supports microphone input (TRRS). Charge-only or listen-only dongles will not pass transmit/receive data.
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