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Class A Stimulus Transmitter


Gator Class A Stimulus Transmitter

Each Gator Transmitter is housed in a high impact ABS water-resistant case. It has a built-in agile frequency synthesizer, dynamically controlled power amplifier and a built-in modem and DTMF (touch-tone) decoding allowing remote control of all transmitter parameters via a phone line or cellular telephone. Remote adjustments include the power level, channel or frequency assignment, and transmit On/Off. All Gators feature a Class A amplifier for the purest and most stable signal output.

Download Gator data sheet
Download Gator manual in the Technical Support section
Download Gator CE Compliance Report
Download Gator FCC Compliance Report
Virtual Gator available on IE 4 and greater

  • Available in 25 Watt Class A, 45 Watt Class A (10 or 20 Watt Class A for PCS) and many more frequencies. See below.
  • Pure spectrum Class A power amplifier
  • Weighs 25 pounds
  • Power amplifier with continuous adjustable power output 0.1dB over > 32 dB range
  • Water resistant, rugged 18" x 15" x 6" ABS plastic case
  • Microprocessor-controlled with front panel soft-keys or remotely controlled with an internal modem allowing for user programmable modulation schemes, power levels, channels, and frequencies.
  • 240 x 64 LCD with vacuum fluorescent backlighting
  • VSWR antenna protection and internal forward and reverse measurement
  • Dual cooling fans lBuilt-in thermal overheat protection for amplifier
  • Battery backed-up SRAM stores all user selectable parameters in the event of a power loss
  • Powered from 110-240 VAC 50-60 Hz, UL, CSA, CE and FCC approved
  • CW identifier for FCC CP identification
  • All parameters can be adjusted remotely via RS-232 or the internal modem or DTMF signaling tones

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Display 240 X 64 pixel graphic supertwist LCD (VF backlit)
Stability less than 1.5 PPM for first year, + for 1 PPM for aging
Output Power Continuous adjustable power output + 1.0 dB over > 32 dB range (below 1 GHz)
Power Adjustments Continuously adjustable via rotary knob or direct keypad entry in 1 dBm increments over > 20 dB on models above 1 GHz
Spurious Output > 55 dBc (decibels below carrier level)
Harmonics Output > 55 dBc (decibels below carrier level)
Power 110-240 VAC 50-60 Hz, auto-switching, UL and CSA approved
10 and 20 watt models may also be powered from +12VDC
Remote Control Via serial RS-232, internal modem or DTMF through telco
Output Power Monitoring Forward and reverse power monitored via internal power meters. Output is regulated to < +1.0 dB of setting at up to a 6:1 VSWR
Case Size 18" x 15" x 6"
Weight 23 lbs.
Power Output 20 watts into 50 ohms (GSM cellular model)
PA Class Linear, Class A amplifier
Output Adjustments + 0.1 dB steps over 20 dB range to full output
Power Regulation Internal forward and reverse power meters with built-in circulator
Internal Protection Infinite VSWR (shuts off at > 6:1 SWR)and temperature protected
Tuning Range 935.2-959.8 MHz
Tuning Increments + 50/200 kHz steps via keypad or rotary control
Stability + 2.0 PPM from 0 deg to 50 deg C
Type of Modulation GMSK internal data modulator
Data Rate 270,833 symbols/second
Baseband Filter Gauss, B x T=0.3
Remote Control Three ways, modem, DTMF or RS-232-C via rear panel
Display Graphic 240 x 64 EL backlighted
Power Input 110, 220 VAC, 50-60 Hz or 23-27 VDC at 6 Amps
Frequency Stability + 2 ppm from 10 to 50 C
Frequency Steps + 200 kHz
Frequency Range Cellular or PCS models
Data Rate effective rate 271 kbps (per GSM specs)
Modulation 0.3 GMSK (per GSM specs)
Frame Length 1250 bits
Serial Port RS-232C
Format 8 data bits
Parity none
Start/Stop bits one
CW Unmodulated CW signal. Note, GSM data modulation cannot be turned on from the main Gator screen.
External Transmitter will modulate with user-supplied and filtered I and Q data from an external source. This is via BNC connectors located on the top panel of the Gator.
GSM RND Gator outputs GSM modulation with internally-generated and random PN (pseudo-random) data.
GSM BUFF GSM modulation with user-downloadable BCCH (base station control channel) stored data, downloaded by the user with PC loader software. This is via the RS-232C jack in rear. User must supply the base station data to be output, gator will repeat this transmission indefinitely.

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  • PCS (downlink) and (uplink) 1.850-2.10 GHz, steps from 50 kHz to 50 MHz Cellular 850-900 MHz 30 kHz steps (Class A, 25 Watt or 45 Watt) LMR 850-870 MHz 12.5 kHz steps (Class A, 25 Watt or 45 Watt) Paging 900-930 MHz 12.5 kHz steps (Class A, 25 Watt or 45 Watt)GSM (see specs above)
  • IS-136 1900 MHz
  • Wi-MAX 2.5 or 3.4 GHz
  • ISM 2.4-2.49 GHz
  • iDEN / SMR
  • AMPS 218-219 MHz
  • ETACS 850-950 MHz
  • PACS 218-219 MHz
  • IVDS 218-219 MHz
  • PCS available in 10 and 20 Watt Class A, with or without internal data modulation
  • WCS 2.3-2.5 GHz
  • UMTS 1920-1980 MHz Up-link
  • UMTS 2110-2170 MHz Down-link
  • MMDS 2.5-2.7 GHz
  • Available formats are GSM or IS-136, or 10 and 20 Watt Class A for CW only with > 20 dB power control
  • Power control > 32 dB on all transmitters below 1 GHz
  • ***Custom frequencies available upon request***
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    The Gator Controller is a software controller application that allows complete control over BVS' Gator transmitter. The application's interface mimics the top panel to allow Gator users to seamlessly control all of its functions from any PC through the serial cable.

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    2500-2700 MHz
    (8.5 dBi gain)

    Mag-Mount Antenna (perfect for drive studies)




    Forecaster PC software allows Gator and compatible receivers such as Coyote to overlay all drive-study measurements for overall RF coverage.





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    Why won't my Gator turn on when I hook it up to a gas portable generator?

    Certain model generators output an impure noise spike in the AC output. This anomaly has been traced to ignition noise riding on top of the sine waveform. So while this output is fine for most devices requiring AC power, the Gator will not turn on because it requires pure regulated AC power. Several model Honda generators have been tested and approved for this application, and also this problem can be easily remedied by simply using an inexpensive AC surge suppressor found in any convenience or hardware store.

    Does Gator transmit a complete CDMA signal?

    No, not really. The Crocodile is Berkeley's premium CDMA stimulus transmitter. It has been designed to fit in between existing base stations using any available PN offset, without effecting normal operation of the other base stations. It outputs Pilot I & Q signals used for measuring correlated signal strength and includes all timing and clocking circuits to meet IS-97A requirements, including clock holdover in excess of 24 hours in the absence of GPS signals.

    How do I control the Gator once it is up on the crane?

    All of the Gator's necessary functions may be controlled via any touch-tone telephone line, a cellular phone or from any PC that has Gator Controller software installed. Every Gator is equipped with an internal RS-232C and Bell 202 modems to control all functions from any PC with supplied software.

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