The ALAN 507 SpeakEasy is a portable two-way radio designed for communication over short distances. It features a compact and robust design, making it suitable for various personal and professional applications.
Function Description:
The ALAN 507 operates as a transceiver, capable of both transmitting and receiving radio signals. It utilizes a PLL synthesizer for frequency control, ensuring stable and accurate communication. The device supports 69 channels with a channel spacing of 25 KHz, operating within the 433.075-434.775 MHz frequency range.
Key functions include:
- OFF/VOLUME Control: This knob serves as the main power switch and allows for adjustment of the audio output volume.
- Channel Selectors (UP/DOWN): These buttons enable users to navigate through the available channels, with the selected channel displayed on the LED screen.
- "CALL" Button: Pressing this button transmits an alerting tone to other radios on the same channel, useful for attracting attention.
- "SCAN" Function: This feature allows the radio to automatically search for busy channels. When a carrier signal is detected, the scan pauses, resuming after a few seconds once the communication ends. The scan can be deactivated by pressing the PTT button or any other control.
- "DW" (Dual Watch) Function: This advanced feature enables simultaneous monitoring of two different channels. If a signal is received on the second monitored channel, the conversation on the first channel is automatically interrupted, and the receiver switches to the second channel. Monitoring resumes 4 seconds after the signal on the second channel ends.
- "PTT" (Press-to-Talk) Button: This button activates the transmitter when pressed, allowing the user to speak. Releasing it switches the unit back to receiver mode.
- "MON" (Monitor) Control: Pressing this button opens the squelch, allowing the user to hear background noise and determine if a channel is busy. This is particularly useful for initial volume setting.
- VOX Function (PTT/VOX switch): The ALAN 507 supports hands-free operation through its VOX function. Transmission can be initiated by speaking close to the unit. The microphone sensitivity for VOX can be adjusted to two levels: "H" (high sensitivity) or "L" (low sensitivity).
Important Technical Specifications:
General:
- Channels: 69
- Channel Spacing: 25 KHz
- Operating Frequency: 433.075-434.775 MHz
- Battery Life: Approximately 45 hours (with alkaline batteries)
- Batteries: 3 AA type 1.5V alkaline or 1.2V Ni-CD
- Operating Temperature: -10°C to +55°C
- Frequency Control: PLL synthesizer
- Frequency Stability: +/-2.5 PPM
- Weight: 100 gr
- Dimensions: 50 x 100 x 30 mm
Receiver:
- Sensitivity (12dB SINAD): Better than 0.35 μV
- Squelch Threshold: Auto
- Audio Output: 0.3 Watts (max)
- Frequency Response: 300Hz - 3000 Hz
- Intermediate Frequency: 1st IF: 21.4MHz, 2nd IF: 0.455MHz
Transmitter:
- Frequency Coverage: 433.075-434.775 MHz
- Output Power: 10mW
- Type of Modulation: FM
- Modulation Capability: +/- 4.5 KHz (max)
- Spurious Emission: Less than 250 nW
- Frequency Tolerance: +/- 2.5PPM (-10°C to +55°C)
- Current Drain: Below 100mA
- Stereo Jack for External Speaker: 3.5mm
Usage Features:
- Antenna: The antenna screws into the top of the radio, ensuring good signal reception and transmission.
- Speaker and Microphone: Integrated into the radio, these components facilitate audio input and output. For optimal transmission, the user should speak with a normal voice level, holding the radio 4-10 cm from their mouth.
- LED Display: A clear LED display shows the currently selected channel.
- LED "TX/BATT" Indicator: This LED illuminates during transmission and also indicates low battery power, prompting the user to replace or recharge batteries.
- Speaker Microphone Connector: An external jack allows for connection of optional speaker/microphones or earphones for private listening or hands-free communication.
- Charge Jack: The radio can be connected to a charger via this jack. It operates at a maximum of 4.5 volts. Important: Do not connect to electrical systems or sources higher or lower than 9/10 volts, as this will cause severe damage.
- Hole for Wrist Belt: Provides a convenient attachment point for a wrist strap.
- Belt Clip: Allows for easy attachment of the radio to a belt or clothing.
Maintenance Features:
- Battery Compartment: The battery compartment is accessed by pressing a grooved latch and sliding the cover downwards. It accommodates 3 "AA" size alkaline batteries or 3 "AA" Ni-Cd rechargeable batteries.
- Battery Care (Ni-Cd):
- Full Discharge: Ni-Cd batteries should be fully discharged before recharging to prevent the "memory effect," which can reduce their capacity. The "TX/BATT" indicator coming on during receive operation signals a full discharge.
- Full Charge: Always allow Ni-Cd batteries to fully charge before use.
- Storage: It is recommended to store Ni-Cd batteries in a discharged state rather than charged.
- Compatibility: Never use batteries that differ from the recommended types. Avoid mixing old and new batteries or rechargeable batteries of different capacities.
- Alkaline Batteries: Alkaline batteries are not rechargeable and should not be connected to external power or a charger.
The ALAN 507 SpeakEasy is designed for user-friendly operation and reliable performance, with clear indicators and controls to facilitate communication.
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