Unofficial compilation note: this library is unofficial material compiled and rewritten by BG7BAG Radio from public sources, for study reference only, and is not affiliated with the equipment manufacturers. For takedown requests, contact contact@bg7bag.com.
FT-65R APRS via external TNC / phone
The analogue radio has no APRS itself — external gear completes position and messaging.
An analogue radio can still do APRS
The FT-65R is a pure analogue FM HT with no built-in APRS. But with an external TNC (e.g. a Mobilinkd-class Bluetooth/wired TNC) or a phone app (e.g. APRSdroid), you can inject APRS audio into the radio to transmit your position and messages.
What APRS is
APRS (Automatic Packet Reporting System) is an AX.25 packet-based amateur-radio position/message system: your location, status, weather and messages are packed into 1200 bps AFSK audio and transmitted by the radio, then received by a nearby iGate and posted to the internet. APRS requires transmitting, so a licence is needed.
Two main approaches
- Option A: external hardware TNC (e.g. Mobilinkd TNC2/3, KISS-compatible): the TNC makes APRS audio and feeds it into the radio via a cable; it often controls PTT (or the radio uses VOX).
- Option B: phone app + audio coupling (e.g. APRSdroid): the phone generates audio, linked to the radio by a wired cable or a small Bluetooth-TNC-style device; the radio uses VOX or a PTT control box.
Gear list
- FT-65R HT + antenna (stock or better for APRS)
- TNC or Android phone (APRSdroid etc.)
- matching interface cable (radio data/accessory port, or mic+spk adapter)
- power (power bank / battery pack)
Step by step
- Find the local APRS frequency: 144.390 MHz in North America, 144.800 MHz in Europe / Region 1 — follow local practice.
- Tune the radio there; use narrow FM as usual (APRS is 1200 Hz AFSK, normal FM settings are fine).
- Connect the TNC/phone to the radio audio port; if using VOX, set trigger level and delay to avoid false or clipped transmissions.
- In the TNC/app enter your callsign, symbol and comment; listen first to confirm activity and no conflict, then transmit.
- Transmit: the TNC drives PTT or you press it; once sent, your packet should appear on maps like aprs.fi (via a local iGate).
Practical tips
- Listen before transmit; the APRS channel is shared — do not beacon too often.
- VOX level calibration is key: too low will not trigger, too high will; leave tail room so the packet end is not clipped.
- Use the lowest sufficient power (1–5 W); APRS relies on dense iGates, not power.
- Phone setups need care with delay and feedback; use isolating/attenuating cables.
Compliance note
⚠
APRS transmitting needs an amateur licence and legal bands; the FT-65R itself cannot decode APRS — everything is done by the external TNC/phone. Flashing or modifying the radio to unlock TX range is illegal in most places.
Can the FT-65R receive APRS directly?
No. It has no built-in decoder; you see positions via the phone app or the internet (aprs.fi). The radio only transmits externally generated audio, or passes received APRS audio back to the TNC/phone to decode.
Do I must buy a hardware TNC?
Not necessarily. A phone + APRSdroid + audio cable / small Bluetooth-TNC device gets you started; a hardware TNC is more stable and can run without the phone.