The TH-75A is a dual‑band FM transceiver (144/440 MHz U.S./Canada version, 144/430 MHz other markets) with optional CTCSS tone squelch. The manual covers the TH‑75A, TH‑75E variants and lists all supplied accessories such as antenna, battery pack, charger and optional TSU‑6 tone unit.
It details operating controls, battery installation and charging procedures, specifications, maintenance tips, and step‑by‑step installation of optional accessories. Safety warnings and recommended duty cycles are also included.
| Frequency range (U.S.A. version) | 144‑148 MHz / 438‑450 MHz |
|---|---|
| Frequency step options | 5, 10, 12.5, 18, 20, 26 kHz |
| Antenna impedance | 50 Ω |
| Power requirement | 6.3 – 16 W (7.2 VDC nominal) |
| Operating temperature | 20 °C to +50 °C |
| Microphone impedance | 2 kΩ |
The TSU‑6 provides sub‑audible tone squelch (CTCSS) operation, allowing the receiver to open only when the correct tone is received; it is included with U.S.A. and Canada models.