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 Model 7005A VSWR ALARM & MONITOR 
for 824-960 and 1800-2100 MHz

7005a.gif (17576 bytes)
  • For analog or digital cellular, PCS, and two-way radio systems.
  • Two models: 824-960 MHz and 1800-2100 MHz.
  • Intelligently protects transmitters. 
  • True average measurement of  forward and reflected power. 
  • 25W to 500W (824-960 MHz), or 2.5W to 25W (1800-2100MHz). 
  • RS-232 link to computer or other display / control device. 
  • Low insertion loss, high directivity (30dB min.), and extremely low intermod distortion (less than -130dBc)
The Bird Model 7005A Series VSWR Monitor is designed for long-term VSWR monitoring and power measurement in analog or digital cellular, PCS, paging, and two-way radio systems. The 7005A can be used at any point in the transmission system, including the main antenna feed line, after the combiner.
A high-directivity coupler and microprocessor control provide state-of-the-art accuracy and versatility. VSWR is calculated from forward and reflected power measurements, and compared to an internally settable VSWR threshold of 1.3 to 1.8.
The 7005A Series features an RS-232 compatible interface for connection to a notebook or host computer for readout of forward and reflected power and control of alarm functions.

Alarm Action

When the line VSWR exceeds the threshold, the 7005A Series will initiate one of the following actions based upon the degree of mismatch:

  • VSWR less than the set point: no alarms are activated.
  • VSWR equals or slightly exceeds the set point: additional measurements are accumulated to determine a trend. If reflected power increases during this time, an alarm condition is generated. If reflected power is stable, an alarm is generated if VSWR exceeds the threshold for more than thirty seconds.
  • VSWR greatly exceeds the set point: an alarm is generated immediately.

Alarm conditions are indicated by a red LED on the monitor, and the activation of a form C relay. Normally open, common, and normally closed relay contacts are available at the Alarm/Power connector. The relay is a "fail safe" type which automatically enters the alarm state if supply power is lost.

Reset Operation

Alarms may be reset through any of three actions:

  • A Local Reset button located on the monitor.
  • A TTL-compatible Remote Reset pin located on the Alarm/Power connector. This method will reset the unit up to three times before a local reset is required.
  • Remote Reset through the RS-232 interface. Up to three remote resets are possible before a local reset is necessary.

Specifications

Frequency Ranges: Two models cover 824-960 MHz and 1800-2100 MHz.
Forward Power Measurement
   Type: Average reading.

   Power Measurement Range: 824-960 MHz: 25 W to 500 W.
                                           1800-100 MHz: 2.5 W to 25 W.
Accuracy: 5% of reading, 1 count.
Maximum Input Power: 750 W average, 3.0:1 VSWR.
  
Insertion Loss: 824-60 MHz: 0.12 dB maximum.
                         1800-100 MHz: 0.15 dB maximum.
   VSWR: 824-60 MHz: 1.07:1 maximum.
            1
800-100 MHz: 1.15:1 maximum.
Reflected Power Measurement
   824-960 MHz: 2.5 W to 50 W average.
  
1800-2100 MHz: 0.25 W to 25 W average.
   Directivity: 30 dB minimum.
VSWR Alarm Characteristics
   Set points and (Accuracy):1.3 ( 10%), 1.5 ( 5%), or 1.8 ( 5%).
Relay Contact Type: Dry, Form C. Relay contacts: COMMON, N.O., N.C.
Contact Rating: 100Vdc @ 0.5 A.
Visual Alarm: Red LED illuminates to
indicate an alarm condition.
Stimulus: VSWR set point exceeded,
response time proportional to overload.
Reset: Local mechanical reset switch.
Remote input (Reset @ 0 to +0.8 Vdc).
Interface Port
   Connector: Female DB-9, compatible with IBM PC AT serial port.
   Protocol: Serial RS-232, 9600 baud, no
parity, 8 data bits, 1 stop bit, no handshake.
Physical and Environmental Specifications
   General: Thruline sensor for direct insertion in 50-ohm line.
   RF Connectors: Type N(M) in, N(F) out.
   Alarm/Power Connector: 15-pin female 5 "D" shell.
Operating Temperature: 0 to 50 C.
Storage Temperature: -20 C to 80 C.
Humidity: 0 to 95% maximum (non-condensing).
Altitude: Up to 3000 m above sea level.
Passive Intermod Products: less than
-130 dBc.
Power Requirements: +16 to +28 Vdc @
0.1 A or less.
Dimensions (excluding connectors):
5.0" ) H 5 4.6") W 5 1.3") D
                                               
(12.7 cm 5 11.7 cm 5 3.3 cm) .
Weight: less than 2 lb. (0.45 kg).
  • Compatible with analog or digital cellular, PCS, paging, and two-way radio systems.
  • Two models: 824–960MHz and
                     1800–2100 MHz.
  • Can automatically shutdown transmitting equipment based on abnormal VSWR.
  • True average measurement of forward and reflected power from 25 to 500 watts.
  • Low insertion loss, high directivity (30dB min.), and extremely low intermod distortion (less than -130dBc)
WISCO International, Inc. - MIAMI, FL U.S.A.
Fax: (954) 370-3997 | E-mail: wiscointl@wiscointl.com

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