Technical Data



New crystal receiver with directional antenna

Our HFR-2 has been completely redesigned and shows several decisive improvements in comparison to its predecessor. The rotary switch for switching the range of measurement has been eliminated. Thus we created space for a volume control. In this connection, it is clearly audible that the "sound" has been improved as well.
The range of measurement was adapted to the common practical requirements. As measured values exceeding 10 mW/m2 (= approx. 2000 mV/m) are quite rare, we succeeded in finding a realistic value for the maximum range of measurement here. By increasing the receiving sensitivity, we were able to reduce the bottom range of measurement according to the organic architecture recommendations for the values to less than 1 µW/m2 (= approx. 20 mV/m) (typically approx. 0.6 µW/m2 = approx. 15 mV/m).
As a microprocessor is used here for the first time in this price range (similar to PDM-3), we are able to do without a switching of the range of measurement nevertheless. That is how we had to switch from the usual unit for the radiation density W/m2 (watts per square metre) to the unit for the electric field strength V/m (volts per meter). HFR-2 displays the electric field strength in millivolts per metre (mV/m). A constantly increasing number of countries (Switzerland, Italy, France,...) only state their limit values and precaution values based on the unit V/m, so that we have made allowances for this development here. The units can be converted in other units as a matter of course. A conversion table is enclosed.
For those customers who have difficulties separating themselves from W/m2 we offer a real treat: the measured value is represented as an analogue bar chart in the second line of the display. Several bars have small marks in addition (small lines, see photo). These marks identify the values 1 µW/m2, 10 µW/m2, 100 µW/m2, 1 mW/m2 and 10 mW/m2. This enables an easier assignment of the measured values in the W/m2 scale.
As a microprocessor is able to compute as well, HFR-2 provides for an increased accuracy of measurement.
The logarithmic, periodic antenna (Logper antenna) for the frequency range from 900 MHz to 2.6 Ghz included in the scope of delivery also contributes to this increase in the accuracy of measurement. Thus the direction and the polarisation of the HF radiation can be determined exactly.


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Technical Data HFR-2

Frequency range:

  • approx. 100 MHz to 2500 MHz teilweise kompensiertpartially compensated (approx. 10 MHz to 3500 MHz with reduced exactness)

Measuring method:

  • Crystal receiver

Range of measurement:

  • 15 mV/m to 2000 mV/m (= approx 1-10000 µW/m2 = 100 pW/cm2 - 1 µW/cm2)

max. sensitivity:

  • better than 0,6 µW/m2 (= 60 pW/cm2)

Uncertainty of measurement:

  • Basic accuracy better than ± 5 dB, (better than ± 3 dB according to Prof. Käs)

Display:

  • LC display, 2 lines

Ambient temperature:

  • 0 to 40° C

Measurements:

  • 85mm x 117mm x 55mm

Functions:

  • Peak detection (for measuring pulsed signals)
  • Volume adjustable

Weight:

  • approx. 300 g

Power supply:

  • 9V Blockbatterie

Current input:

  • max. 20 mA

Scope of delivery:

  • HFR-2, Logper antenna 900MHz - 2600 MHz, headphone output, adapter, battery
  • optionally also available with a recorder output

Accessories:

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