Product Info

Type Acceptance Information for TS4000 Radio Modem with 3492 Transceiver
Proposed FCC ID JWFTS4000D
Teledesign Systems, Inc Confidential Information Page 2
Radio Transceiver Manufacturer: E.F. Johnson
Radio Transceiver Model Number: DL3492
Radio Transceiver Part Number: 242-3492 (± 1.5 PPM frequency stability)
Radio Transceiver FCC ID: ATH2423492-001
Frequency Range: 928 - 960 MHz
Maximum RF Power Rating: 5 watts
RF Power Range: 0.1 - 5.0 watts, software selectable
Method of Modulation: Direct FM
Types of Modulation: 4 Level FSK
GMSK with BT = 0.3
GMSK with BT = 0.5
Type of Emissions: 25K0F1D - Part 101
20K0F1D - Part 90 (multi-bandwidth mode)
12K5F1D - Part 101
11K2F1D - Part 90 (single bandwidth mode)
Emission Designator Calculations:
Modulation Types:
The TS4000 is designed to use three modulation types: 4 level FSK, GMSK with a BT=0.5 and
GMSK with a BT=0.3. The 4 level FSK modulation is provided to allow a high spectral efficiency
for a given channel bandwidth. The GMSK modulations are provided in order to be compatible
with other products and data communications standards.
Channel Bandwidths:
Our goal is to certify the TS4000 at two different channel bandwidths for Part 90: 20K0 and 11K2;
and two different channel bandwidths for Part 101: 25K0 and 12K5. This is to allow the TS4000 to
be setup for the most efficient operation for a given channel bandwidth that a user is licensed for.
4 Level FSK 25K0F1D and 20K0F1D:
Channel Baud Rate (B) = 32000 bps
Modulation Frequency (M) = B (1/8) = 4000 Hz
Peak Deviation = 6000 Hz
Bandwidth Calculation = 2 (D) + 2 (M)
Bandwidth Calculation = 2 (6000) + 2 (4000)
Bandwidth Calculation = 12000 + 8000
Bandwidth Calculation = 20000 or 20K0