FSK RADIO MODEM

General

RF frequency range: 150-174 MHz, 406-430 MHz, 450-475 MHz, 928-960 MHz

FSK frequencies:

2400 baud models Space = 2450 Hz, Mark = 4450 Hz

1200 baud models Space = 1300 Hz, Mark = 2100 Hz (Bell 202R compatible)

300 baud models Space = 1070 Hz, Mark = 1270 Hz (Bell 102 compatible)

Baud rate: 2400 baud maximum

FCC compliance: Meets parts 15, 21, 90, 94

RF connector: 50 BNC female

Power and control: 15 pin "D" type male

Make sure you wear your anti-glare glasses when making changes to the FSK

Dimensions: 7" x 3.5" x 2.5" (17.8 cm x 8.9 cm x 6.35 cm)

Weight: 1 lb 6 oz

Operating temperature: -30 degree to +60 degree C

Storage temperature: -40 degree to +75 degree C

Humidity: Will withstand 8 hours at 95% at 40 degree C

Shock stability: Per MIL-STD-810C method 516.2

RFI integrity: Cabinet radiation is 20 dB better than FCC requirements

Pin Assignments:
 PIN# FUNCTION
1 GND
2 VSWR sense (Low to alarm; not available for 950 MHz)**
3 Signal present (open collector NPN sinks to GND upon receipt of signal)**
4 FSK not detect**
5 FSK detect**
6 Rx mute (High to mute; TTL level*)
7 Data input (TTL level*): High = Low frequency tone
8 N/C
9 Keyline (High to transmit; TTL level*)
10 Data output (TTL level*) High = Low frequency tone**
11 +12.5 VDC in
12 Spare
13 Modulated tones test point
14 Discriminator audio test point
15 +V pull-up

* TTL voltage levels: High = +2.5 V, Low = 0.0-0.5 V

** Open-collector outputs (NPN), 10K pull-up resistors located on the p.c. board can be utilized by connecting +V to pin 15. Up to a 5 mA sinking capability can be provided with external resistors connected to +V (pin 15 open).

Power Requirements

Voltage: 12.5 VDC +/- 10%

Current:

Standby: 23 mA maximum

Receive: 28 mA maximum

Transmit: 550 mA maximum (at 2.0W) for 138-174 MHz, 406-430 MHz, and 450-475 MHz; 750 mA maximum (at 2.0 W) for 928-962 MHz

Receiver¦

Decoder type: FSK demodulator using PLL

Turnaround time (Tx to Rx): <10 mS

Carrier attack time: <10 mS

Logic sense: Mark = logic low

Output level: Open collector

Sensitivity: 1 x 10-3 BER for -107 dBm (1.0 uV)

RF input typically: -115 dBm (0.4 uV) for 138-174 MHz; -113 dBm (0.5 uV) for 406-430 MHz and 450-475 MHz; -111.5 dBm (0.6 uV) for 928-960 MHz

Transmitter***

RF power output: 2 watts (standard), 4 watts (VHF and UHF only)

RF spectrum: Meets FCC requirements with 2400 baud one-zero pattern at data input

Modulation type: AFSK

Harmonic distortion: 5% maximum

Input levels: TTL voltage levels

Input logic sense: Logic high = space, Logic low = mark

Turn-on settling time: <6 mS for stable tone/RF amp frequency

FSK tone amp balance: <0.5 dB between mark and space

RF center freq. stability: +/-5 ppm (138-174, 406-430, 928-960 MHz); +/-1.5 ppm (high stability option, 928-960 MHz)

***For individual frequency ranges refer to the appropriate RDL specification sheet.

Specifications are subject to change without notice.

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