Field Analyzer FA300
Contents
1. 18 Chapter 3 Low trequency Slectric Tie ideer iaa E E T ATT 19 3 1 a 1012 6 0 ae eee een ener ete oe rs Ce rend eee are eae oe anger e ee ese 19 3 2 Meas re miem eana a a ar E ls caunsaestsatnausddentavtes 20 3 3 DAI CAV ANIC S ie a a NA A 21 Chapter 4 Low frequency magnetic field oo cee eececcsssscecccceceeeeeeeeeeaaeeeeeesseeeeeeeeeeeeeeeeeeeeeaaaas 22 4 1 Measure meN nenen e a o a a 22 4 2 ELR GS tseachtain esha E sates TT E E eters A E E tans Sennett A E EA uaseee 23 Chapter 5 Displaying logged measurement results 2 0 0 0 ccccccsscssseseeeseeeeeeeececeeeeeeeeeeeaaaas 24 5 1 Display measurements on the FA735 ennnnnnnnssssseeeeeeeeereronosssssssssssssseererereesssssesssss 24 32 Connecting the Micro SD card t your PC 00 4 tein eatin a 26 5 3 View measurements with your computer ccccccccccccccceeeeeeeeceaeesseeseeseeeeeeeeeeeeeees pa APDO Ad chs mae e ene eM Peron eS Rr nD TEER een Nee rae renee Net eee ee eran e ene ee 28 Appendix 1 Specifications FATS Neonet teda ian past Gotha sats ied geet coh 28 Appendix 2 Conversion from microwatt m to milli Volt meter eee 29 Appendix INIOTS MTOTIMAN ON nascent teeeatelenctidtele ees Ab aes ee 30 Appendix 4 ANDO VIAMONS sesuai a atece wis dentedeaases eaenae aacaeteeess 30 User manual FA735 version 1 0 Introduction This manual is intended for the FA735 and also for the FA720 FA725 and FA730 But these last three devices do not have all features of th2. 27 20 3 4 4 5 56 JRF 12 12 50 log 23 WoWine 3 0 02 002 002 O02 002 002 0 02 IRF 12 13 00 log 2c PWT T I0 oO 63 63 oO O02 0 02 Go W on om Bee Go ee SS Se RF 12 13 10 log 15 uWire Bo 80 425 125 100 63 50 RF 42 43 20 log 56 Wim 250 ol o O42 012 012 16 80 2500 RF 1213 30 log 58 PWr o ol aj 425 425 32 425 2500 IRF 1213 40 bog 586 PWr o o o o oO o 1600 RF 1424350 log 56 p Wine oo a a a o o olism BIRF 121400 bg 586 jpWinF 2000 0 02 0024001 001 o o o oO o o ol 2000 19 RF 12 14 10 9 56 pwm 1600 0 02 0027 0 01 oot o o o oj oj 0 1600 z E CC y Sf IE At row 1 you see the software version the date and the serialnumber of the device Row 2 indicates the moment when the electrical field measurement is started The values for electric field measurement are in row 3 up to 5 De unit is in column E and the value itself is in column F Row 6 indicates the start of the magnetic field measurement The values for magnetic field measurement are in row 7 up to 9 De unit is in column E and the value itself is in column F Row 10 RF indicates the start of the electromagnetic field measurement and indicates the meaning of the cells in the following RF rows Cell G10 up to R10 indicate the frequency category of the cells below them In this example several columns are deleted between comlumn H and I to get a clearer picture The first frequency category is 0 3
3. FA735 version 1 0 3 2 Measurements The display will show the strength of the electric field in V m Volts per meter It will also show the waveform The vertical height of the waveform is automatically adjusted for optimal visibility The range is 0 5 V m up to 199 V m After switching the device on it will take 20 seconds before the electric field can be measured If you choose Hold switch this on as described in chapter 1 the measurements will stop and the last measurement will be frozen on the screen until Hold is switched off again The distance to the source of the field has a big influence on the measurement result 20 User manual FA735 version 1 0 3 3 Safe values When you choose Safe you will see together with the measured value what values are safe for the electric field strength during sleep according to the german SBM2008 standard Also the values with qualification 99 66 slight concern severe concern and extreme concern will be visible Again pressing Safe will switch back to the normal display For indoor living or working areas you can use values that are 10 times higher than the values during sleep that are shown here 21 User manual FA735 version 1 0 Chapter 4 Low frequency magnetic field 4 1 Measurement The magnetic field sensor is placed at the right side of the device The human body does not shield the magnetic field as opposed to the
4. The following conditions apply The signal has to be strong enough The signal must not be stronger than the FA735 can measure The signal must be sufficiently stronger than signals with another frequency that are present at the same moment When one of these conditions 1s not met then the signal will most likely change from category when you move the device around Frequency of several radiation sources 15 User manual FA735 version 1 0 2 5 Hold function The device will remember the highest measured value for every frequency category This is visible as a small dash above the bar of the category When HOLD is switched on this highest measured value will be displayed instead of the current value This is switched on as follows Use button 4 or 5 to switch to the Hold function group Now you can switch the Hold function on or off with button 3 When hold is switched on you will see Hold at the left side of the screen With button 6 Clr you can reset the hold values to the current actual value 2 6 Choosing the measurement unit Within the Hold function group you will als find the Unit button button 2 Here you can change the measurement unit of the device you can choose between microwatt per square meter millivolt per meter dBm measures the energy level at the antenna connector 16 User manual FA735 version 1 0 2 7 Display signal pulsation Instead of a bar diagram that shows the
5. The polarization of radiation might change when it 1s reflected from a metal object Also the polarization of a signal can be somewhere between horizontal and vertical 2 3 Display On the screen you can now directly read the strength of the signal in microwatt per square meter When the signal is pulsed the shown strength is the strength at the top of the pulse The frequency of all signals is measured if possible and the frequency of the strongest signal is shown at the left side of the screen here 0 9GHz See section 2 4 14 User manual FA735 version 1 0 2 4 Frequency measurement The frequency of all signals is measured and the frequency is assigned to one of the following categories from 0 3 up to 2 8 GHz 26 categories ascending per 0 1 GHz from 3 0 up to 4 0 GHz in category 3 4 from 4 0 up to 5 0 GHz in category 4 5 from 5 0 up to 6 0 GHz in category 5 6 or the category Any if the frequency can not be measured On the screen you will see a bar chart that shows the signal strength per category The bar display is logarithmic this means that you can also see small signals while strong pulses of another frequency are present Above the signal with the highest strength you will see a small arrow and the corresponding frequency category is visible at the left side of the screen with a GHz indication beneath it The frequency measurement does not work under all circumstances
6. square meter setting Again pressing Safe will switch back to the normal display For indoor living or working areas you can use values that are 10 times higher than the values during sleep that are shown here 18 User manual FA735 version 1 0 Chapter 3 Low frequency electric field 3 1 Orientation Electric field sensor position The sensor is at the back side of the device The device should be held in a vertical position with the sensor pointing to the direction in which you want to measure Do not put your hand in front of the sensor this will attenuate the electric field and result in a measurement result that 1s much too low The device should be grounded by placing one of your fingers at the grounding point at the backside of the device Grounding point The device responds to changes in the surrounding electric field This means that it will respond to the 50 Hz changing field of the electric wiring and devices in the house but it will also respond to a change in the static electric field A static electric field can be as strong as 1000V m and it will not be the same at every place in the room A small movement in this field can produce a high result on the screen Thus the device should not be moved during the measuring procedure The static electric field can change as well when someone else walks through the room and this also can have an influence on the measurement result 19 User manual
7. 1 0 Chapter 1 General 1 1 Switching ON or OFF The device is switched on by shortly pressing the little button that is located at the top side Pressing the same button again switches the device off On Off switch The function of the frontside buttons will be visible on the bottom of the screen as long as the device 1s switched on On the screen you will see the model number FA735 FA730 FA725 or FA720 software version V 1 4 and serial number 0216 of the device Screen after power on Home The operating state of the meter is always visible at the left top of the screen Immediately after switching on this is Home You will also see the current date and time for FA735 and FA725 When the date or time is not correct you can set these see section 1 7 User manual FA735 version 1 0 1 2 Micro SD memory card The micro SD memory card should only be placed or removed when the device is switched off The card should be placed with its contacts pointing upwards to the top of the device You can use your nail to push it the last stretch until it clicks Contacts of the card pointing upwards User manual FA735 version 1 0 1 3 Choosing what to measure The function of the frontside buttons will be visible on the bottom of the screen as long as the device 1s switched on Directly after switching on you can choose between Push the 1 button RF to measure the high frequency electromagnetic fie
8. GHz 300MHz and the last one is 5 tot 6 GHz Frequencies of 2 9 GHz go into the 3 4 GHz range We will take row 14 as an example for the RF values In this row columns G H I etc indicate the values that belong to the frequency in the same column in row 10 The frequency category with the highest value is in column D this is 5 6 GHz The value that belongs to this frequency is in column F in column max this value is 2500 microwatt m2 here The same value is found in column R that contains the values for 5 6 GHz The unit for RF measurement column E is the same as the unit used during the measurements 2l User manual FA735 version 1 0 Appendices Appendix 1 Specifications FA735 High frequency Measurement high frequency 300 Megahertz up to 6 0 Gigahertz Display in microWatt per square meter uW m7 Volt per meter V m or dBm Range approx 0 4 u W m up to 40000 W m Measurement of frequency 300 MHz up to 6 GHz Display shows signal strength as a function of frequency or time Logaritmic scale can show weak signals in the presence of strong pulses of another frequency Displays the peak value of pulsed signals Hold function for remembering the highest peak value SMA connector for external antenna Antennas for 800 1000 MHz and for 1 8 6 GHz are included Low frequency Low frequency electric field from 0 5 V m up to 199 V m Volt per meter Internal sensor Low frequency magnetic fi
9. Use the cardreader that is included with the FA725 735 to connect the micro SD card to a USB port of your computer The cardreader should be placed with the blue side facing upwards It will fit in two ways but it will work in only one way As soon as the cardreader is attached to the PC a window will pop up Choose Open folder to view files Then choose the folder Log and then select the month and day of the measurements that you want to see In this folder you see a file xx yyyzz csv xx A Z yyy month zz day for example AJ OCT22 CSV When you click on this file Microsoft Excel will open and show the measurements see next section If you want you can copy this file to your PC to archive it You can put the files of all days in the same folder the xx code in the name guarantees that the files will be sorted according to their date The first x is the year A 2011 and the second x is the month A january 26 User manual FA735 version 1 0 5 3 View measurements with your computer ALOCT22 xl5 EEEa D Eae E ETE rE eT a ie ae ee ERR eS 1 ree FATS jlog j swvt 4 2011 Oct22 sn0216 ia o Blec 12 10 55 start unit max 3 Elec 12 10 50 log Vim 12 4 Elec 12 11 00 log Vim 60 Elec 12 11 10 log Vim 3 2 Magn 12 11 22 start urit max Magn 12 11 30 log uT 0 29 Magn 12 11 40 log uT 0 26 Magn 12 11 50 log uT 03 RF 12 1246 stat freq unt max Os O45 22 Z3 24 25 26
10. User manual FA735 version 1 0 Field Analyzer FA735 Users Manual Also for the FA720 FA725 and FA730 www envionic com l User manual FA735 version 1 0 Contents Introductio iaeaea e A E A O 3 ACCESSO S a E E E 5 Chapter 1 Gem ta heresis A a E TT 6 1 1 Swit mE ON OR OF F arenie a E A a A N 6 Ted MicroSD memory Cal oci a a a N a a ae 7 1 3 CHOOSING what to Measure errors eeinetan a estate dat an A ohai aTa 8 1 4 SPEKE eia ested asic Se aces A 9 1 5 Batterie S satan stern areas EE ceded altet trate eels dread lubes teats lalate dada 10 1 6 Chan cine Of charge DAU CL CS ivcccisecivesiavisausssedaadicdenwounussnnnedsatdeieivesbeaisddxeaodaesaeresedeak 11 t7 Sene Mean dIe a N 12 Chapter 2 High frequency electromagnetic field ccccccccccccccecseessssseeseeeeeeeeceeeeeeeeeeeeeaaaas 13 2 1 Measurement with LogPer antenna c ccc csesesesssseseeececceeeeeeeeeeecaaaaseessesseseeeeceeeeeees 13 2 2 Measurement with non directional antenna cccssessseeseeseeeeeeceeeeeeeeeeeeeeaaaas 14 2 3 BED as chreeece steele E oto ed a nals eve E 14 ZA Eregucncy Measurement tie icrai ak atdva cies iai S dee miueebe eaten eentaciadtenys 15 2 5 Hord TUNGU OR pee eer nen emt eer een ce meme eT Pe Un een earn eee ee nnn a 16 2 6 Choosing the measurement UNIt cc ccccccccccssssseseesseeeeeeeeeceeeeeeeeeeeeeasaaeeeeeeeeeess 16 24 Display sienal pulsanoms cane toenails oon 17 2 8 Se WG AE E E E E oracse seus ask E E E meee acetates neste T
11. ation broadcasting masts UMTS mobile telephones and their base station broadcasting masts DECT cordless phone base stations they emit regardless in use or not DECT cordless telephones WLAN or WIFI wireless computer networks WIMAX wireless network wireless video systems microwave ovens bluetooth wireless systems television transmitters 2 Low frequency electric fields FA 730 735 only that are emitted by Home supply power lines 110 or 230 volt wall sockets and connected appliances also when switched off Out door electric power lines 3 Low frequency magnetic fields FA 730 735 only that are emitted by Power adapters Many 110 230 volt appliances Alarm clocks Transformers of halogen incandescent lamps outdoor electric power lines electric motors engines User manual FA735 version 1 0 Accessories T yranscend The FA735 is delivered together with a LogPer directional antenna for the range 1 8 tot 6 0 GHz a non directional antenna for the range 800 1000 MHz a micro SD memory card of 1 Gigabyte or more a cardreader to connect the micro SD card to the USB port of your computer two AA Alkaline batteries or optional two NiMH rechargeable batteries charger for the NiMH rechargeable batteries option a Boe a Items 3 and 4 are delivered only with the FA735 and FA725 The accessories can be from another brand than shown here User manual FA735 version
12. d to the right selecting a certain time period The maximal signal strength of the selected period will be shown at the top of the screen In the next example signal strength per 10 sec this little arrow is under the 1 of the value 160 The starting time of the choosen time period is shown at the top left corner of the screen in the example october 22 12 00 The frequency category that belongs to the choosen time period is at the left side of the screen There are 32 time periods on screen together this is 8 hours The other hours of the day become visible by moving the arrow to the side of the screen The arrow buttons have an auto repeat function The button function will repeat if the button is pressed for longer than half a second Signal strength per 10 sec zoom If you want a more detailed overview you can press button 2 Zoom This will enlarge the choosen 15 minutes to 90 bars of 10 seconds each The Zoom state will be indicated at the left side of the screen Pressing Zoom again will bring you back to the bars of 15 minutes 25 User manual FA735 version 1 0 5 2 Connecting the Micro SD card to your PC You can also see the stored measurements as a spreadsheet on your PC with Microsoft Excel Switch the device off and remove the micro Sd card Use your nail to press the micro SD card a little the card will then be released and you can take it out Push the slide of the cardreader
13. e FA735 The features of the four devices can be found in the next table FAT20 FAT25 FA730 FA735_ RF High frequency measurement upto6GHz e e e e Low frequency electric field measurement e e Low frequency magnetic field measurement e Data logging on micro SD memorycard e Software upgrade through micro SD card e For the RF field not only the strength but also its frequency can be measured The strength of the field is also shown in a graph as a function of the frequency The figures measured are displayed on a clear graphic LCD display When measuring high frequency radiation the pulsation can be heard via the build in speaker In the time mode you can view these pulses on the screen The low frequency fields are also audible on the speaker and their waveform is visible on the screen The data logging function writes the measurement result to a micro SD memory card every 10 seconds It writes the current time and date together with these measurements The recorded data can be viewed on the device itself or on your PC as an Excel spreadsheet The internal software can be upgraded through the micro SD card User manual FA735 version 1 0 The FA735 is a sensitive measurement device that measures three kinds of fields The fields measured are 1 High frequency electromagnetic fields that are emitted by GSM mobile telephones and their base st
14. eld from 0 01 uT up to 3 99 uT microTesla Internal sensor Shows the waveform of low frequency elektric and magnetic fields General Automatic logging of measurement values on a micro SD memory card Measurements are stored together with time and date Shows stored measurements on the display or as a spreadsheet on a PC with Excel Graphic display 128x64 pixels ith adjustable backlight Speaker with volume control to make the signals audible Connection for external speaker Internal software upgradeable through the micro SD memory card Powered by 2 AA batteries included or rechargeable batteries option Indication for battery condition Connection for battery charger Builtin charger for NiMH rechargeable batteries Dimensions 150 x 90 x 24 mm excl antenna weight 240 gram 28 User manual FA735 version 1 0 Appendix 2 Conversion from microwatt m to milliVolt meter The screen displays the strength of the radiation in microwatt per square meter uW m7 The unit Volt per meter V m is also frequently used and can be calculated with the following table The value in the mV m column should be divided by 1000 to convert it to Volt per meter 8 6 5 4 3 2 2 1 The conversion between these units Is quadratic When the mV m value doubles the UW m value quadruples NNNNOUORA AOOO ONM 010M 0100100 N Na 29 User manual FA735 version 1 0 Appendix 3 M
15. electric field so it is not very important how the device 1s held in your hand The device should be hold in several position because it is only sensitive to a single direction of the magnetic field lines The highest measured value should be used The device should not be moved during the measurement Magnetic sensor position The display will show the strength of the magneticic field in microTesla It will also show the waveform The vertical height of the waveform is automatically adjusted for optimal visibility The measurement range is from 0 01 uT up to 3 99 uT The distance to the source of the magnetic field has a big influence on the measured strength of the magnetic field 22 User manual FA735 version 1 0 After switching the device on it will take 20 seconds before the electric field can be measured If you choose Hold switch this on as described in chapter 1 the measurements will stop and the last measurement will be frozen on the screen until Hold is switched off again 4 2 Safe values When you choose Safe you will see together with the measured value what values are safe for the magnetic field strength during sleep according to the german SBM2008 standard Also the values with qualification slight concern severe concern and extreme concern will be visible Again pressing Safe will switch back to the normal display For indoor living or working areas yo
16. fter some time the filling in the battery picture will blink When the battery can no longer be used an empty battery symbol will blink After that the device will switch itself off Two AA batteries can be found at the backside of the device Battery compartment Batteries 10 User manual FA735 version 1 0 1 6 Changing or charging batteries Mains adapter connection If rechargeable batteries are used you can charge them by connecting the delivered wall adapter to the device and to an outlet After 10 hours the batteries will be charged completely The device should be switched off while the batteries are charged Caution pay attention to the polarity when you place the batteries only use 5 volts adapters center terminal positive do not charge non rechargeable batteries used batteries should be handled as chemical waste If you want to check if the batteries are being charged then switch the device on You will see an animated picture of a battery that that is being filled Then you can switch the device off again If you keep the meter on while the batteries are being charged this will extend the charging time because a part of the charging current will be used to power the device When you change the batteries then try to do that within one minute After one minute the internal clock may loose the current time and date and you will have to set these again Please be aware that most newly bough
17. ld chapter 2 Push the 2 button Elec to measure the low frequency electric field chapter 3 Push the 3 button Magn to measure the low frequency magnetic field chapter 4 After measuring you can go back to this screen with the 1 button Home User manual FA735 version 1 0 1 4 Speaker After choosing what to measure you can set the sound to a certain volume with the buttons Vol and Vol During setting of the volume the volume setting is displayed It can be set to a value on a scale from 0 to 8 For RF this gives an audible impression of the pulse modulation of the radiation After some practice it is possible to identify the kind of radiation by the sound it produces The strength of the radiation has not much influence on the sound volume Weak signals can produce almost as much sound as strong signals For the low frequency measurements the sound volume depends on the strength of the signal To make low frequencies 50 or 60 Hz audible some higher harmonics are added to the speaker signal Phones connection One of the two channels of the stereo phones connection provides the sound signal to an external device The internal speaker will be switched off when this connection is used User manual FA735 version 1 0 1 5 Batteries Battery condition When the batteries are almost empty this will be shown on the screen At first as a partly filled battery see picture A
18. ore information www powerwatch org uk www scram uk com www imast victims org www buergerwelle de english start html www tetrawatch net The SBM2008 can be found at http www baubiologie de Appendix 4 Abbreviations Hz Hertz Unit for the number of cycles per second KHz KuiloHertz 1 000 Hertz MHz MegaHertz 1 000 000 Hertz GHz GigaHertz 1 000 000 000 Hertz T Tesla Unit for strength of magnetic field uT microTesla 0 000 001 Tesla nT nanoTesla 0 000 000 001 Tesla V Volt Unit for electric potential difference mV milliVolt 0 001 Volt W Watt Unit for power energy per second uW microWatt 0 000 001 Watt DECT Digital Enhanced Cordless Telephone GSM Global System for Mobile Communications TETRA Terrestrial Trunked Radio UMTS Universal Mobile telecommunications system WLAN Wireless local area network Due to continuous improvements in the described devices information contained in this manual is subject to change without notice The device and the manual were assembled with great care However the seller or manufacturer can not be held responsible if any direct or indirect damage occurs during or after the use of this device or the information in this manual 30
19. signal strength as a function of the frequency category you can also show the signal strength as a function of time If the signal is pulsed this will show the pulses of the signal Use button 4 or 5 to select functiongroup Disp With button 2 you can now set the Time display At the left of the screen you will now see Time instead of GHz Pressing button 2 again it is now called Freq will switch back to the normal display The following example shows the pulses of a DECT base station The dotted line is the Hold value At the left of the screen you will also see the frequency 1 8 GHz This is not the impulse frequency Pulsed DECT signal A non pulsed continuous signal will be displayed as follows example CT1 cordless telephone Non pulsed signal 1 2 3 6 O O O 5 O Within this functiongroup Disp you can use button 3 Lt en 6 Lt to change the backlight When there is direct sunlight you get a good visibility by switching the backlight off 17 User manual FA735 version 1 0 2 8 Safe values When you choose Safe you will see together with the measured value what values are safe for the RF electromagnetic field strength during sleep according to the german SBM2008 standard Also the values with qualification slight concern severe concern and extreme concern will be visible This only works in the microwatt per
20. t NiMH rechargeable batteries have to be charged before the first use If you use ordinary non rechargeable batteries then Alkaline typed are preferred The optional power adapter is suitable for mains voltages from at least 100 Volts up to 240 Volts AC 11 User manual FA735 version 1 0 1 Setting time and date At the home screen press the Menu button 4 and then the Time button 4 and or 5 Then activate Time with button 6 Press the OK button after setting time and date Duing measurements the time will be shown at the left side of the screen Time at the left side of the screen 12 User manual FA735 version 1 0 Chapter 2 High frequency electromagnetic field When this is selected RF Radio Frequency will be visible at the upper left top of the screen A suitable antenna must be connected Two antennas are delivered together with the device A LogPer directional antenna for the range 1 8 6 0 GHz A non directional antenna for the range 800 1000 MHz The measured value strongly depends on the position of the device 1 e its distance and angle to the source of radiation especially for indoor measurements Radiation is generally not emitted with the same strength in all directions In most indoor situation the radiation is coming directly from the source but can also be reflected by big objects indoor or outdoor objects The combination of direct and reflected signals ca
21. u can use values that are 10 times higher than the values during sleep that are shown here 23 User manual FA735 version 1 0 Chapter 5 Displaying logged measurement results 5 1 Display measurements on the FA735 Every 10 seconds the FA725 and FA735 devices store the measured value on their micro SD memory card You can examine all measurements Press button 4 or 5 to choose the Mem functiongroup Then push button 3 Hist An overview appears with measurements of the current day Measurements of one day In the top line yo see the year month date and the day of the week Choose the kind of measurements that you want to see with button 6 for instance RE uW m Use the upper option to get an overview of all measurements of the current month Again choosing gives an overview measurements of all months You can also get an overview of measurements of all months from the Home start screen Just select Menu and then Card and Log If the memory card is not present you will get a warning directly after switching the device on 24 User manual FA735 version 1 0 Signal strength per quarter of an hour After selecting the measurement you will see a bar diagram with the maximum strength of every time period Every bar in the diagram is a period of 15 minutes With the arrow buttons 3 and 6 you can move the little arrow on the screen to the left an
22. uses interference patterns Due to interference the measured value can vary a lot even when the device is moved only about 10 or 20 cm The interference pattern can also be heard via the speaker The highest value measured is used to determine if the amount of radiation is acceptable The hold mode makes it easy to determine the highest value measured when moving the device through the room 2 1 Measurement with LogPer antenna Measurement position with LogPer antenna This antenna is for the range 1 8 6 0 GHz The LogPer antenna should be pointed in the direction in which you want to measure In most cases the green triangle of the antenna should be vertical because most signals have vertical polarization The device itself will mostly be horizontal in these cases 13 User manual FA735 version 1 0 2 2 Measurement with non directional antenna 800 1000 MHz antenne For the non directional antenna the device should be held in a vertical position with the antenna pointing upwards This will receive signals from all around you Signals that come from the direction behind your back will be displayed less strong because these are attenuated while travelling through your body Most signals have a vertical polarization Due to this a vertical position of the device is optimal when using the non directional antenna Signals with horizontal polarization can be measured by holding the device in a horizontal position
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