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3 GHz Selective Band High Frequency Analyzer HFA-3
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Device description of the HFA-3
The HFA-3 is a broadband radio receiver and a selective band receiver for verification and appreciation of high-frequency signals. The logarithmic periodic antenna ranging from 10 Mhz to 3 Ghz covers the frequency ranges of terrestrial analog and digital broadcasting, cellular mobile radio services and cordless phones (DECT etc.), WLAN (Wi-Fi) and the radiation of microwave ovens and allows for the detection of the direction and the plane of polarisation of high-frequency signals. A frequency filter facility enables limiting the frequency range to the three bands of mobile telephony GSM 900, GSM 1800 and UMTS (frequency ranges of downlink by the base stations respectively), DECT, UMTS and WLAN (Wi-Fi).
Measuring modes of operation
The options of selective frequency ranges facilitates to assess high-frequency signals. The HFA-3 permits capturing the average value of the non-pulsed portion of the modulated signal and the peak value of the pulsed portion using a peak-hold facility. Additionally an acoustic analysis of the modulation by the implementated speaker or externally connected phones can be done for identifying the high-frequency signals.
Multifunctional indication
The measuring device provides two available units of measure: Measuring values can be received from the device as electric field strength (mV/m) or as radiation density (µW/m²). A bargraph on the display enables the user to get a rapid overview of the measured values. The menu-driven setup of the device is easy to handle by two control keys at the front face of the device.
Multifunctional connectivity
There is optionally available a serial interface (RS232) for HFA-3 with a functional PC software enabling long-term recordings, logging and evaluating the measurements. It also enables to connect an external data logger. An optional analog output for pen recorders provides the measuring values as an analog DC signal.
The technical specifications
Frequency range:
- approx. 100 MHz to 2.5 GHz, partially compensated
(approx. 10 MHz to 3 GHz at reduced accuracy)
Measuring ranges:
- 6 mV/m to 2000 mV/m (= ca. 0,1 - 10000 µW/m² = 10 pW/cm² - 1uW/cm²)
Maximum resolution:
- better than 0,01 µW/m² (= 1 pW/cm²)
Frequency ranges of filters:
- All-pass/broadband (100 MHz to approx. 3 GHz)
- GSM 900 (935 MHz to 960 MHz)
- GSM 1800 (1805 MHz to 1880 MHz)
- Cordless telephony according to DECT (1880 MHz bis 1890 MHz)
- UMTS (2110 MHz bis 2170 MHz)
- WLAN, Bluetooth and microwave ovens (2400 MHz bis 2500 MHz)
Type of filter:
- passive
Indication:
- Display double-spaced and acoustic indication
Modes of Operation:
- Peak search function with peak-hold facility
- Average value
- Units of measure selectable
- Sound level adjustable
Interfaces:
- Headphone output
- optional serial interface (RS232)
- optional analog output for pen recorders
Admissable operating temperature:
- 0 to 40°C
Physical dimensions:
- 85mm x 117mm x 55mm
Weight:
- ca. 300g
Power supply:
- 9V block
- Indication of low battery
Current input:
- max. 20mA
Delivery contents:
HFA-3 with transport case, LogPer antenna 900MHz to 2.6GHz, battery
Available accessories: analog output for pen recorders, serial interface with PC software for data processing