Gigahertz Solutions UBB27 Manual de usuario

UBB27 Made in Germany



UBB27

27 MHz - 3,3 GHz

English

Page 8

RF-Analyser

High Frequency Analyser for Frequencies

from 800 MHz to 2.7 (3.3) GHz

Manual

Made in Germany UBB27



Safety instructions

Please read this manual carefully before using this instrument for the first time! It contains

important information for use, safety and maintenance of the antenna.

Do not allow the antenna to contact water. Do not use it outdoors while it rains. Clean its

outside only, and with a slightly moist cloth.

No cleaning agent or spray! Before cleaning

remove the antenna from the instrument.

There are no user-serviceable parts inside the instrument.

The antenna is sensitive to heat, shock and touch. Do not leave it exposed to the sun or hot

surfaces. Do not let it drop. Do not open it.

Use it only for purposes it has been designed for. Use it only with instruments or accessories

recommended or supplied with it.

Made in Germany UBB27



6 © Gigahertz Solutions GmbH

English

Design of the antenna

and its elements

1)HF-Analyser, for illustration, not supplied.

2)Resonator (“large monopole“)

3)Indicator lights (LED’s)

Red = contact to circuitry and power supply ok

green = contact of the resonator ok

4)Ground plane for shielding radiation from sources below, includ-

ing the instrument itself.

5)Ferrites for enhancement of the electric characteristics of the

antenna.

6)Casing for the circuitry (incl. Filter and compensation).

7)Mechanical holding fixture fitted for our HF-Analysers.

8)Antenna cable with further ferrites.

9)SMA connector

UBB27 Made in Germany



Assembly

Insert the holding fixture into the crossed slot in the front section of

the HF-Analyser. Connect the antenna cable to the antenna input of

the HF-Analyser. Try not to bend the cable too sharply.

Note of caution:

For technical reasons the resonator is a very delicate part: The

slim foot end should be as slim as possible from a technical

point of view. Avoid touching it, even though a slight inclination

does not influence to measurement significantly.

Technical instructions for the use of the UBB27

The two LED’s indicate functionality of the antenna with the instru-

ment when the instrument is switched on:

The green LED checks the internal circuitry of the antenna and is

on only when it is ok. At the same time it indicates an adequate

power supply.

The red LED verifies the antenna is correctly connected to the

instrument. The red LED turns on if the connectors and contacts

are ok.

Both LED’s are part of an analogue circuit. When the power be-

comes “low“, they do not go off completely, instead they become

dimmer.

The power for the active circuits of the UBB27 is supplied by the RF

analyser (HFE35C or HF59B) through the antenna socket.

The power consumed by the UBB27 alone is higher than that of

the instrument itself. The time one battery charge can power the

instrument plus antenna therefore is reduced to less than half. For

long term recordings use the external power supply.

As long as the display does not show “low batt”, the measure-

ments are reliable, regardless of the reduced brightness of the

LED’s.

Directional pattern / reception characteristic of

the UBB27

The directional pattern of reception of the antenna held upright re-

sembles a lying doughnut, like indicated in the following drawing:

Made in Germany UBB27



8 © Gigahertz Solutions GmbH

Its best reception is:

Isotropic (uniform over the whole circumference) in the perpendic-

ular plane around the resonator axis,

For vertically polarized radiation sources.

Its sensitivity decreases with an increased angle of incidence to the

ground plane. The radiation from below is shielded by the ground

plane. This considerably reduces the distortions of the radiation field

to be measured. It also isolates the antenna from the instru-

ment,,casing, connectors and the measuring technician below the

antenna.

Power densities of horizontally polarized sources in the horizontal

plane will be displayed as lower values by up to – 10 dB. To better

analyze a horizontally polarized TV transmitter, turn the UBB27 hori-

zontally with the ground plane in the direction of the transmitter (like

a wheel rolling towards the source to be measured).

Directional pattern and reception characteristics are similar to those

of the so-called bi-conical antennas, with the UBB held vertically

corresponding to the bi-conicals, and their “cages” upwards and

downwards. An advantage of the UBB over the bi-conical antenna

is the measurements are more reproducible. This is because of the

downward shielding of the ground plane

Note of caution concerning far field conditions

Please remember, that this antenna (and the LogPer as well) has

been designed for far field conditions and provides reliable data

only when those prevail.

Where does the far field begins? From 1.5 to 10 times the wave

length. A simple rule of thumb for this complex subject. (2.5 wave

lengths) gives

27 meters at 27 MHz

2.7 meters at 270 MHz

27 centimeters at 2.7 GHz.

Note: Inside the Near field the electrical and the magnetic field

should be measured separately (one cannot calculate e.g. the mag-

netic field strength from the electric field strength and vice versa).

Under far field conditions a single measurement gives the power

density (in W/m², mW/m² or μW/m²).

How to perform measurements

Under most measuring conditions the antenna is to be held vertical-

ly.

The instrument should be held relatively high with an outstretched

arm to reduce the field distortions from the measuring technicians

body. If one holds it directly in front of oneself, then the body partly

shields the radiation from the backside.

The measurement itself is executed the same way as with a loga-

rithmic-periodic antenna, except that there is no need to point it in

all directions, as the UBB is omni-directional in the plane perpen-

dicular to the resonator. For further detail refer to the instruction

manual for the specific instrument in use.

UBB27 Made in Germany



The UBB27 in most typically shows higher readings than a

LogPer antenna, for two reasons:

With its smaller dimensions it can show so-called “hot spots”,

highly localized areas of intense radiation due to multiple reflec-

tions etc, without “spatial averaging”. This often accounts a factor

of 2 to 4 in interior situations.

Sources in the expanded frequency band below that specified for

the LogPer antennas may contribute to the total immission.

It is calibrated to a slightly higher average readings so that the

lower edge of its specified tolerance band still never goes below

the reading of a comparative measurement with a logper-antenna

even in frequency bands where it is in its specified plus tolerance.

Measurements obtained with the UBB27 are as accurate as those

obtained from the LogPer antenna. Please Note: The latter has a

narrower tolerance band, because of a lower volatility of their fre-

quency band curve, which on the other hand is much narrower. In

addition they are much bigger and provide average power densities

over a wider area. Both can be and should be used when evaluating

the immission in a given situation. It is significant to note which

technique was used for each measurement.

“Rattling tone” for marking of un-pulsed transmitters

When using the HF59B in audio analysis mode with the UBB27

attached (The switch “Signalanteil” or “Signal” set to “Voll” or

“Full”), one will almost always hear a rattling tone. This is because

sources of un-pulsed radiation are almost always present in the

very broad frequency range of the UBB27. The loudness of it is

proportionate to the percentage of un-pulsed radiation in the total

signal received. The marking is done with a frequency of 16 Hz

(very low). An audio sample can be down-loaded as a MP3 file

from our home page.

Limits for using the RF amplifier HV10

Only the HF59B can supply enough Power for the UBB27 plus the

HV10. The battery life decreases by ~20%.

The external attenuator DG20_G3, may be used with the UBB27

plus either HFE35C or HF59B.

Accuracy

By itself, the UBB27 inaccuracy range of +/- 3 dB extends from ap-

prox. 85 MHz up to 3.3 GHz. The antenna continues to work beyond

that, but with increasing attenuation.

We state the total accuracy of our HF analyzers for the complete

assembly of analyzer plus antenna in a far field under well defined

conditions. (An “average measurement” with the complete assembly

placed on a non-conductive support). The measurement inaccura-

cies for the complete assembly are the following:

HFE35C plus UBB27 stays the same, and

HF59B plus UBB27 increases moderately to +/- 4.5 dB.

Below 85 MHz the tolerance level of the setup for the calibration

becomes predominant and limits the accuracy achievable for the

Made in Germany UBB27



10 © Gigahertz Solutions GmbH

demonstration of the instrument. A simulation, which demonstrated

an excellent correlation of actual measurement and simulated sig-

nals in the frequency band above the lower limit, proves a very good

linearity down to 27 MHz. Without verification we cannot guarantee

the accuracy. Frequencies below 27 MHz are damped out by an

internal, extremely steep high pass filter.

NOTE: The UBB27 causes a noise of up to 5 μW/m² in the ”Min”

range. With the HF59B this can be reduced significantly by using

the “Pulse” mode.

EN: Rev. 2.4 (02/18)

Made in Germany UBB27



Hersteller / Manufacturer / Fabricant / Produttore:

Gigahertz Solutions GmbH

Im Kessel 2, 90579 Langenzenn, GERMANY

www.gigahertz-solutions.de / com

Your local partner /

RTK AB

Granberga 9

186 91 Vallentuna

Sweden

Tel +46 8 510 25 510

Sms +46 709 273 324

Webb www.rtk.se

Mail info@rtk.se

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