Geovital HF field probe for transmitter, radio relay and mobile radio measurements

HF field probe specially developed for geological and building biology analyses

The HF field probe was specially developed for geological and building biology analyses and is intended to show in a self-explanatory way at which analysis values an exposure exists.

For this purpose, empirical value from the medical and environmental medical field of the last 30 years were used.

• Large digital display instrument with acoustic output
• Easy handling
• Measuring range up to 8 GHz
• Detection of high-frequency electric fields and transmitters, e.g. in living and sleeping areas
• Acquisition of stress values by body coupling (for professional geobiological analyses)
• Fast location of Wifi and DECT
• Loudspeaker to reproduce frequencies also in sound form.
• Reliable tool for professionals, quick instruction of laypersons, e.g. patients, possible

Electric field

By means of the attached measuring antenna, high-frequency fields can be measured in µV (microvolts).

A significant advantage is that not only air can be measured, but also the bodies of people.

Especially in geobiological measurements, the exposure of the persons is of important significance here.

In this method, the body acts as an antenna and collects all frequencies hitting it. The HF field probe displays the collected frequency spectrum from 10 MHz - 8 GHz in microvolts.

The field strength (HF) increases or decreases due to:

• Distance to the EMF source

• Power of the EMF source

• Type, structure and orientation of the source

• Influence of transmitters in the immediate vicinity

The audio frequency and key changes with increasing EMF intensities and type of transmitter.

Difference between building biology measurement vs. geobiology measurement

With the building biology measurement (W/m²), the (outgoing) power of the cause / transmitter and thus the air is measured. A body coupling is not provided / possible here.

The geobiological / medical measurement (µV) determines the (arriving) electrical voltage.

This is particularly interesting because by touching the antenna (enlargement of the antenna by the corresponding person = body coupling), it is now possible to estimate with what intensity the body and the nervous system are exposed. This type of measurement has been called "medical measurement" since the 1990s.

For this measurement, the body-tolerable values should be below 30 µV (target) if possible.

If this is not possible and the displayed values are too high, HF shielding according to Faraday is strongly recommended! More info on https://en.geovital.com/

After successful shielding, the values should go down significantly and settle at best in the body-compatible range of below 30 µV. Once this is achieved, the person will show you OK in the display.

Battery

The HF field probe has a LiPo battery. The battery status is indicated by means of a battery symbol.

Scope of delivery

• HF field probe

• 4 GHz Antenna

• 8 GHz Antenna

• 2,5 GHz pass filter

• Charger

• Charging cable

• Instruction manual

2,5 GHz pass filter - For reproducing measured values according to the old measuring method of the Hengstenberg field probe.

When measuring in µV (microvolts), the Hengstenberg device had established itself as the standard by the end of the 1990s. Mainly medical doctors and environmental physicians used this measuring device to obtain an assessment of the body burden of patients. The Hengstenberg HF field probe became the standard measuring instrument for geobiologists. All shielding standards known to geobiology have been developed with this device over the last 20 years.

In 2012, production of the old Hengstenberg HF field probe was discontinued.

Since there was no successor device available and no other manufacturer was willing to develop a successor device, GEOVITAL stepped into the breach and started a 250,000 euro programme to develop an HF device that works according to the old Hengstenberg measuring method. After 4 years of development, this has been ready and in use since 2016.

On the old HF field probe from Hengstenberg it is stated that a measuring range of 4 GHz is possible, but physically the measuring range is limited by the construction materials used. Since stainless steel was used as measuring components and antennas, the usable measuring range is only 2.65 GHz. Stainless steel cannot detect higher frequency ranges.

Lab measurements have shown a realistic maximum range of 2.4 - 2.5 GHz.

The new GEOVITAL HF field probe was designed for frequency ranges up to 8 GHz. The reason why a higher constructions was not chosen is solely due to the affordability of the components and measuring electronics, which would otherwise have been excessively expensive, as these would be high-priced custom-made products.

In order to tie in with the old empirical values of the last 20 years and to present a comparability of the old and the new HF field probes, the new HF field probe can be reduced to this frequency range by means of the 2.5 GHz pass filter.

This is interesting, because during this time environmental health professionals have agreed on maximum parameters to be used in the control of shielding materials.

In order to be able to continue to control this, the possibility of the old Hengstenberg measuring method must also be possible with the new HF field probe.

Technical data

Frequency range: 10 MHz - 8 GHz compensated, better -3dB

Display Numerical: 0 - 9999 μV

Acoustic signal: reproduction of frequencies in sound form

To be regulated via volume control on the right side

Display: 2.8" TFT 240 x 320 dots

Antenna: Tuned to the frequencies to be investigated with SMA connector

Power supply: LiPo 3.7V, 1.8 Wh built into the unit

Operating time: approx. 20 hours (depending on operating mode)

Charging voltage: 5 VDC 500 mA

Charging time: approx. 3 hours

Auto Power Off: Disconnect after approx. 10 minutes

Low battery indicator: Symbol in the display

Operating elements: Button - On / Off

Dimensions (WxHxD): 72 x 140 x 32 mm

Weight: approx. 240 g

UL approval printed circuit board E255774

UL Approval Battery UF103450P

Caution: Do not take measurements while the battery is charging, this will lead to measurement errors!