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Transmitting Data ​

Once you've logged racer times, the next step is transmitting your data to race control. TRacer sends station-specific data over the radio using MT63, a digital mode sent as audio over radio.

📤 What Gets Sent ​

When you transmit, the app sends:

  • The selected station number

  • A list of bib numbers, each with:

    • Time In (if available)
    • Time Out (if available)
    • DNF status and reason (if applicable)

INFO

Your selected station determines what location the data is attributed to when it is sent to race control.

🚀 Using the Send sheet ​

  1. Tap Send in the bottom bar to open the Send sheet
  2. You’ll see a data table previewing all untransmitted records
  3. Tap the Transmit all changes button to send the current data
  4. Hold your phone near the radio’s microphone (not too close — 6–12 inches is usually ideal)
  5. The app will emit an audio signal (MT63 format) to send the data

Use push-to-talk the same way you would when speaking on the radio. Use a reasonable phone media volume: loud enough for the radio microphone to pick up clearly, but not so loud or close that the audio distorts.

When transmitting starts, TRacer plays a short tone and then modem-like MT63 audio. A progress circle fills around the stop icon while audio is playing. Transmission is complete when the audio stops.

Once transmitted, the record will appear in a History section just below. This list shows previously sent transmissions in collapsible entries.

Tapping a history entry reveals:

  • A 4-character hash (used to identify the transmission, derived from the selected station number and the time the transmission was first sent)

  • A list of blocks:

    • Headers (includes the selected station number and the total transmission size)
    • Data blocks (numbered: 1, 2, 3, etc.) which contain the actual transmitted racer data

🔁 Re-sending Data ​

If race control didn’t receive all of your transmission:

  • Open the Send sheet
  • In the History section, tap the relevant transmission to expand it
  • Select the specific blocks race control requested (e.g., Headers, or data blocks 1, 2, etc.)
  • Tap the speaker icon next to the transmission summary (e.g., “6 runners sent at...”) to retransmit the selected blocks