Alinco DR-735D Dual Band UHF/VHF Mobile Transceiver User Manual

1. Introduzione

The Alinco DR-735D is a dual-band mobile transceiver designed for reliable communication across VHF and UHF frequencies. It features a full-duplex system for simultaneous operation on VHF/UHF, and semi-duplex operation on UHF/UHF, including AM reception for the VHF airband. This manual provides essential information for the proper setup, operation, and maintenance of your transceiver.

Caratteristiche principali:

• Full duplex operation for simultaneous VHF/UHF communication.
• Up to 50W output power on both VHF and UHF bands.
• Dual band display with independent volume and squelch controls.
• Selectable LCD display color with 8 backlight options, including white.
• Detachable control panel for flexible installation.
• Alinco EMS-78 microphone with dual PTTs and programmable sub-PTT.
• Two microphone connectors (one on main unit, one on control panel).
• CTCSS and DCS tone encoding/decoding included.
• Frequency steps: 5, 6.25, 8.33, 10, 12.5, 15, 20, 25, 30, 50, and 100kHz.
• 1000 memory channels plus 100 dual channels.
• Two external speaker outputs for separate left/right audio.

2. Contenuto della confezione

Verify that all items listed below are present in your package. If any items are missing or damaged, please contact your dealer.

• Alinco DR-735D UHF/VHF Mobile Transceiver
• Microphone (Alinco EMS-78)
• Cavo di alimentazione CC
• Staffa di fissaggio
• Manuale dell'utente (questo documento)

3. Configurazione e installazione

Proper installation is crucial for optimal performance and safety. Ensure the transceiver is installed in a well-ventilated area, away from direct sunlight and excessive heat.

3.1 Montaggio del ricetrasmettitore

Use the provided mounting bracket to secure the main unit. The control panel can be attached directly to the main unit or separated for remote mounting using an optional separation cable (not included).

3.2 Collegamento di alimentazione

Connect the supplied DC power cable to a 13.8V DC power source. Ensure correct polarity: red to positive (+), black to negative (-). Incorrect polarity can damage the unit. The power source should be capable of supplying sufficient current (e.g., 15A or more) for 50W transmission.

3.3 Collegamento dell'antenna

Connect a 50 Ohm dual-band antenna to the antenna connector on the rear of the transceiver. Use a high-quality coaxial cable with appropriate connectors. A poorly matched antenna can result in reduced performance and potential damage to the transceiver's final amppiù vivace.

3.4 Collegamento del microfono

Plug the EMS-78 microphone into either the main unit's microphone jack or the control panel's microphone jack.

Image: Alinco DR-735D Mobile Transceiver. This image shows the compact design of the transceiver, highlighting its main unit and the detachable control panel, along with the connected microphone. The display is visible, indicating its dual-band capability.

4. Istruzioni per l'uso

This section covers the basic operation of the Alinco DR-735D. Refer to the full user manual for detailed instructions on advanced features.

4.1 Accensione/spegnimento

Press and hold the power button (usually located on the control panel) to turn the transceiver on or off.

4.2 Selezione della frequenza

Use the main tuning knob to change frequencies. The DR-735D features dual VFOs (Variable Frequency Oscillators) allowing independent frequency selection for each band displayed.

4.3 Regolazione del volume e dello squelch

Each band has independent volume and squelch controls. Adjust the volume knob for desired audio level. Adjust the squelch knob to suppress background noise when no signal is present. Turn the squelch clockwise until the background noise disappears.

4.4 Trasmissione

To transmit, select the desired frequency and press the PTT (Push-To-Talk) button on the microphone. Speak clearly into the microphone. Release the PTT button to receive. The EMS-78 microphone includes two PTT buttons for main and sub-band transmission.

4.5 LCD Display Color

The LCD display color can be customized. Access the menu settings to select from 8 available backlight colors. You can set different colors for transmit (TX), receive (RX), standby, and for the main and sub-bands.

5. Manutenzione

Regular maintenance ensures the longevity and optimal performance of your Alinco DR-735D.

5.1 Pulizia

Wipe the transceiver's exterior with a soft, dry cloth. For stubborn dirt, use a cloth lightly dampened with water. Do not use harsh chemicals, solvents, or abrasive cleaners, as these can damage the casing e display.

5.2 Connessioni

Periodically check all cable connections (power, antenna, microphone) to ensure they are secure and free from corrosion or damage.

5.3 Aggiornamenti firmware

Check the official Alinco website for any available firmware updates. Follow the instructions provided with the update carefully to avoid damaging the unit.

6. Risoluzione Dei Problemi

If you encounter issues with your DR-735D, refer to the following common problems and solutions before seeking professional service.

• Nessun potere:
  Check the power cable connection. Ensure the power supply is providing 13.8V DC and is capable of delivering sufficient current. Check the fuse in the power cable.
• No Audio / Weak Audio:
  Check the volume level. Ensure the squelch is not set too high. Verify external speaker connections if used.
• Impossibile trasmettere:
  Ensure the microphone is properly connected. Check if the PTT button is functioning. Verify the antenna connection and SWR. Ensure the frequency is within the allowed transmit range.
• Scarsa ricezione:
  Check antenna connection and condition. Ensure squelch is not set too high. Verify frequency and mode settings. Check for local interference sources.
• Problemi di visualizzazione:
  If the display is blank or erratic, try cycling the power. If the issue persists, a factory reset (refer to the full manual) may be necessary.

If these steps do not resolve the issue, contact your authorized Alinco dealer or service center.

7. Specifiche

8. Garanzia e supporto

Alinco products are manufactured to high-quality standards. For warranty information, please refer to the warranty card included with your product or contact your authorized Alinco dealer. Technical support can be obtained through your dealer or by visiting the official Alinco website for service contact details.