AW07A HF/VHF/UHF Antenna Analyzer V1.6
Contents
1. 4 SHOW REACTANCE VALUE 5 SHOW IMPEDANCE VALUE 6 SWR VALUE FROM 1 1 TO 9 99 7 RF STRENGTH METER 8 FREQUENCY COUNTER SPECIFICATIONS 1 Band Coverage 160m 80m 40m 20 30m 10 15m 2m 70cm 2 RF Output Level 2Vpp 3 SWR Range 1 9 9 4 Impedance Range 10 500ohm 5 Reactance Range 6 L measurement Range 7 C measurement Range 8 External Power DC 10 8 12V 9 Battery 8 AA Alkaline Battery 10 Power Consumption lt 150mA HF Bands B L Off lt 165mA VU Bands B L Off 11 Weight 0 6 kg 12 Size 155 W x100 D x55 H GENERAL GUIDE When you turn on the analyzer by pressing the POWR switch down a sequence of messages will be displayed on the LCD It s the call sign of designer and backlight function indicator To turn up the backlight you need to press and hold the Up button within the time that the message showed on the screen If the message is cleared you need to power off the unit and re power on again for the operation If you do nothing AWO7A will entry next Menu SWR Analyzer or Frequency Counter in 1 Sec Press Down button to Frequency Counter Mode while pressing Up button entering the Antenna Test Mode Also the current DC voltage is displayed Please see the picture below for the front panel operation VHF UHF Click Down to frequency counter Click SWR Up Adjustment Knob Hf2. In general the only adjustment available is the length of the dipole If the antenna is too long it will resonate too low in frequency and if it is too short it will resonate too high Remember feedline length when the antenna is not exactly the same impedance as the feedline modifies the impedance along the feedpoint SWR will remain constant except for a small reduction in SWR as the feedline is made longer if the feedline is a good quality 50 ohm cable If feedline length changes SWR at any one fixed frequency the feedline either has common mode currents that are detuning the antenna or the feedline is not a true 50 ohm cable Common mode currents are caused by lack of a balun or other Installation errors such as a feedline paralleling the antenna 19 2 Verticals Verticals are usually unbalanced antennas Many antenna manufacturers incorrectly downplay the need for a good radial system with a grounded vertical With a good ground system the SWR of a directly fed quarter wave vertical can be nearly 2 to 1 SWR often improves if the ground system and performance is poor so a low SWR with a directly fed Marconi might be a sign of inefficiency Verticals are tuned like dipoles lengthening the element moves the frequency lower and shortening the element moves the frequency higher
3. AWO07A Instruction Manual AWO0TA HF VHF UHF Antenna Analyzer V1 6 e Hi FEA TUREN AWO7A 7 2 INTRODUCTION AWO0TA antenna analyzer is a compact battery powered RF impedance analyzer It can test the SWR status of your antenna measure the impedance and reactance component and help you to solve antenna problems This unit combines six basic parts a variable oscillator frequency counter independent oscillator 50 ohm RF bridge detector an A D converter and microcontroller This compact product was built to feed the need for the solid construction and field test The operating frequency range of this unit goes from HF and extends up to 490MHz It is specially designed for analyzing 50ohm antenna system It measures RF impedances from a few ohms to several hundred ohms The AWO0TA is also an meter measuring the values of capacitors and inductors Additionally it could be a non precision signal source and frequency counter With a built in RF strength meter it tests the RF field strength near your antenna system and it s very useful when you need to know the RF interference status around your station The AWO7A also functions as a non precision signal source and frequency counter The operating frequency range of this unit extends from 1 5 to 71 MHz in six overlapping bands and includes SWR measurements on 85 185MHz 300 490 MHz FEATURES LIST 1 SINGNAL SOURCE 2 CAPACITANCE METER 3 INDUCTANCE METER
4. EST EXAMPLES VHF test 1 TURN ON your analyzer It will show the power on message 2 Press Up for the backlight on or off Press Up to enter the Antenna Analyzer Mode 4 Switch to the band you want to operate See the band selecting part 5 Turn the Tuning Konb to your frequency point to see the tested results SWR Z Rs Jx Please see the picture below as an example 29 630MHz is the resonant frequency E is the band in HF 7 represents Rs j RS 57 ohms 31 represents the reactance component value 31 ohms 65 is the Z value is the complex impedance Z 65 ohms 1 8 is the SWR value UHF test 1 TURN ON your analyzer It will show the power on message 2 Press Up for the backlight on or off 11 12 3 Press Up to enter the Antenna Analyzer Mode 4 Switch to the band you want to operate See the band selecting part 5 Turn the Tuning Konb to your frequency point to see the tested results SWR only Please see the picture below as an example 418 644MHz is the resonant frequency U is the band in UHF 1 2 represents the SWR value is the bargraph display of the SWR The left example shows the SWR status when no antenna connected to AWO07A Frequency Counter Mode Press the Down key on SWR Analyzer or Frequency Counter menu will enter the Frequenc
5. UP will be showed on LCD Additionally the tested field strength level is just for reference is the same to field strength meter it does not have the laboratory accuracy It tests the RF field strength near your antenna system and it s very useful when you need to know the RF interference status around your station If you have a strong RF Interference around your station the antenna analyzer may be less accurate than the case in a good RF environment It s because the antenna gets the interference current down to the AWO07A and it cancels some of the transmitted power from the analyzer WARING 7 is RF sensitive device if you have a very strong RF interference please stop testing your antenna It may damage your AW07A SIGNAL GENERATOR The is useful as a non precision signal source It provides a relatively pure signal of approximately 2 Vpp due to local legal into 50 ohm loads The AWO7A internal source impedance is 50 16 ohms The 7 is not a stable generator but has adequate stability for non critical applications such as alignment of broad bandwidth filters and circuits EXTERNAL POWER SUPPLY The AWO7A be used with external low voltage dc supplies Voltage should not be lower than 10 8 volts and preferably not higher than 12 5 volts The case of the i AWDO0TA is connected directly to the negative terminal The current consumption is 150 DC 1I0 8 12v mA ma
6. _ UV TURE TECH HF VHF UHF Antenna Analyzer ANT port HF V UHF Voltage Down Power switch DC 10 8 12V input BAND SELECTING The 2 switches on the left upper side of the analyzer are the switches to Change band ranges By pressing the two switches up and down the frequency ranges change from HF to UHF EXAMPLES SWITCH TO UHF 1 POWER ON 2 Press the button Up to Ant Mode 3 Press the HF UV switch DOWN 4 Keep the U V switch UP Notes VHF 85 185MHz continuous SWITCH TO VHF 1 POWER ON 2 Press the button Up to Ant Mode 3 Press the HF UV switch DOWN 4 Keep the U V switch DOWN Notes UHF 300 490MHz continuous SWITCH TO HF 1 POWER ON 2 Press the button Up to Ant Mode 3 Keep the HF UV switch UP 4 Press the Up Down button on the center position of your analyzer to change to different HF bands BAND A to F Notes Frequency range in HF bands BAND A to F a small frequency overlap may be possible please see the following A 1 5 2 7 MHz B 2 5 4 8 MHz C 4 6 9 6 MHz D 8 5 18 7 MHz E 17 3 39 MHz F 33 7 71 MHz 10 Antenna Mode Press the Up key SWR Analyzer or Frequency Counter menu will enter the Antenna Mode In this mode it will testand show your antenna system s several parameters such as SWR Z Rs Jx values All of these parameters are showed on the LCD ANTENNA T
7. ximum on HF and 165 mA maximum on V UHF all with backlight off The AWO7A has a 2 1 mm DC power connector on the right of the TUNE Knob This connector is labeled DC 10 8 12V The outside conductor of the DC connector is negative while the center conductor positive Inserting a power plug to the DC 10 8 12V connector will disable the power from the internal batteries WARNING REVERSE POLARITY OR EXCESSIVE VOLTAGE CAN DAMAGE OR DESTROY THE 17 AW0TA NEVER APPLY MORE THAN 13 VOLTS NEVER USE AC OR POSITIVE GROUND SUPPLIES NEVER ADD OR REMOVE BATTERIES WITH AN EXTERNAL POWER SUPPLY CONNECTED TO THIS UNIT OR WITH THE POWER SWITCH ON INTERNAL BATTERIES GUIDE After the cover mounting screws are removed remove the entire back cover Battery box is accessed by removing the AWO07A s cover Place 8 1 5 not 1 2V AA size batteries into the battery box DO NOT use external power supply when replacing batteries ANTENNA ADJUSTMENT HINTS 1 Dipoles Since a dipole is a balanced antenna it is a good idea to put a balun at the feedpoint The balun can be as simple as several turns of coax several inches in diameter or a complicated affair with many windings on 18 a ferromagnetic core The height of the dipole as well as it s surroundings influence the feedpoint impedance and feedline SWR Typical heights result in SWR readings below 1 5 to 1 in most installations when using 50 ohm coaxial cable
8. y Counter Mode In this mode it will test and show the frequency of input signal source FREQUENCY TEST EXAMPLES 1 TURN ON your analyzer It will show the power on message 2 Press Up for the backlight on or off Keep the HF UV switch UP 4 Press Down to enter the Frequency Counter Mode 5 Connect the signal source to your AWO07A 13 14 Please see the picture below as an example 1 Sg represents Slow Gate Press Down will switch to Fg Slow Gate 2 f 207 8350 MHz is the frequency of signal source 3 FS represents the field strength and the tested result will be showed in a bargraph display 4 OmV represents the voltage level of tested signal Notes The Frequency Range of AWO7A in Frequency Mode is 1 500MHz The Frequency Mode of AWO0TA has two time gate they are expressed by Fg and Sg Fg is the Fast Gate while Sg represents Slow Gate In Fast Gate Mode the displayed frequency is only 6 digits counted in MHz In Slow Gate Mode the displayed frequency has 7 digits and 4 digits after the decimal point It s more accurate than Fast Gate Mode As a general rule the longer the time window the more accurate the frequency counted The accuracy of this counter is typically better than 0 08 15 UV HF switch must be on HF position in Frequency Counter Mode otherwise FREQ C SW Error PSE VU HF SW
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