LXQQFY MR300 SWR User manual

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MR300 SWR Analyzer
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MR300SWRAnalyzer
User Manual
Revision 171215
This product is revised by SARK100, and the technology is from Melchor Varel(EA4FRB)

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1Specifications
 FrequencyGeneration & Control:
o 1 - 60 Mhz
o Source impedance: 50 Ohms
o Stability: +/- 100 ppm
o Spectral Purity: Harmonics down >- TBD dB beyond 60 MHz
o Step Size: User configurable increments of 100 Hz, 1 kHz, 10 kHz, and 100 kHz
 Usable Measurement Range:
o SWR: 1.0 to 9.99
o Impedance: approx. 5 to 2000 ohms
 RF Output:
o Adjustable: 2.0 Volts pp (typ)
 Powersupply:
o External: 13.8 to 19 Volts DC, 500mA (Note:12V can be used but can not be
used for recharged)
o Internal: 8xAAA1000mAh NiMH cells
o Charging time: 12 hours (charge rate 0.1C)
 Controls:
o Pushbuttons (5): "Mode", "Band", "Config", "Scan", "Up", "Down"
o Switch: "Power On"
 Connectors:
o RF Out: M (SL16)
o USB: Mini-B receptacle
o External power: 2.1mm Power Jack (center pin positive)
 InstrumentCapabilities:
o Measure antenna electrical parameters: SWR, impedance (resistance +
reactance),capacitance,inductance
o Measurefeed pointimpedance

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o Measure ground loss
o Adjust antenna tuners and determine loss
o Measure inductors and capacitors
o Measure coax transmission line (SWR, length, velocity factor, approximate Q
and loss, resonant frequency, and impedance)
o Measure and determine optimum settings for tuning stubs: SWR, approximate
Q,resonant frequency, bandwidth, impedance
o Determinecharacteristic impedance of transmission line
o Determine length of ¼ and ½ wave phasing lines
o Coaxial Cable Loss
o Determine antenna tuner loss
o Measure balun loss
o Measure inductor Q
o Estimate quartz crystal parameters

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2Connections and Controls

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3 Antenna Analyzer Operation
Power-on
Power is turned on to the MR300 by sliding the switch located on the bottom panel. After
power-on the unit will displayfor half a second the following welcome message:
HR Antenna Analyzer
www.lxqqfy.com
Then the instrument automatically switches to impedance mode that is the default mode and
LCD shows frequency, SWR, and the magnitude of the impedance:
SWR 14,100.000
>10 Z=2000
The analyzer has an automatic power-save function. This function detects that no button was
pressed after a user programmable time and goes into a power saving state and which turns off
the display. In this state the press of any button will start immediately the unit returning to the
same state before the suspension, i.e. the same function and frequency selected. This function
can be disabled bythe user.
It is important to note that this is an energy saving feature but not a full power-off, i.e. the
instrument continues to have a significant consumption so it is recommended shutting down
completelyin the case it s not going to be used.
UserInterface
The user interface consists of six buttons, four aimed at selecting the functions available and two
are used primarily to select the frequency but have the dual function of canceling and validate
respectively.All functions are summarized in theAppendix E:
Adjusting the Frequency
Frequency is changed by adjusting a single digit indicated at the point in the display where the
cursor ‘_’ is by pressing either frequency change button. Upon power-up of the instrument, the
10 kHz digit is the adjustment point, as shown bythe digit with the cursor in the display below.
SWR 14,100.000
1.02 Z = 40Ω
To move the cursor to a different digit to be adjusted, press simultaneously the frequency
change buttons. The cursor will move to any of the seven available digits, allowing subsequent
up/down adjustment of that digit after pressing again the frequency change buttons. A blinking
cursor will be displayduring the digit adjustment mode.

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SWR 14,1  0.000
1.02 Z = 40Ω
Pressing the left button will increase the digit value and, correspondingly, the signal generated
bythe unit. Pressing the right button will decrease the digit and the generated signal.
When the digit is incremented past 9, or when it is decremented past 0, the digits above the
selected adjustment point are rolled up or down, respectively. Using this frequency adjustment
scheme, the user can conveniently pick an “increment” digit and manually scan frequencies with
the desired granularity. Rough scans can manually be done by positioning the cursor under the
100 kHz digit or the 1 MHz digit, giving a wide and course scan of the frequencies with a quick
twist of the dial.
The signal frequency can then be set to the area of interest and the cursor set to a lower
granular digit (e.g., 10 kHz or 1 kHz) in order to manually perform a detailed scan while watching
displayed results for SWR, impedance and reactance.
MODE
Successively pressing the MODE button you can select one of the MR300 operating modes:
impedance (magnitude), complex impedance, capacitance, inductance, and off.
ImpedanceMode (magnitude)
This is the main mode of the instrument and measures the SWR and the magnitude of the
impedance.An example screen is the following:
SWR 14,100.000
1.02 Z = 40Ω
 The top line indicates the mode and the frequency
 The first number on the second line is the SWR, in this case 1.02:1
 The second number is the impedance magnitude (modulus), in this case 40 Ω
In this mode the instrument can be used as a VFO as it keeps the signal in the selected
frequencycontinuously.
Complex ImpedanceMode
In this mode it is measured the SWR and the complex impedance. An example screen is the
following:
IMP 14,100.000
1.02 45 + j 50
 The top line indicates the mode and the frequency
 The first number on the second line is the SWR, in this case 1.02:1

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 The middle value is the resistance, i.e. the real part of the impedance, in this case 45 Ω
 Then it is shown the reactance sign, ‘+’ for inductive reactance and ‘-‘for capacitive
reactance. If it is not shown, i.e. ‘‘it means that it cannot be determined
 Last term is the reactance, in this case it is 50 Ωinductive reactance
This mode can not be used as a VFO because the frequency is continuously dizzling in order to
determine the reactance sign.
CapacitanceMode
This mode allows the measurement of the capacitance.An example screen is the following:
CAP 14,100.000
C = 112.4 pF
 The top line indicates the mode and the frequency
 The bottom line indicates the capacitance in pF
Capacity values must be within the measurement range of the instrument. Given that the
maximum impedance specification for the analyzer is 2000 Ω, the display will show a numeric
value only when the reactance is less than this value. The formula to calculate the capacity is the
following:
XC  1
2piF C
InductanceMode
This mode allows the measurement of the inductance.An example screen is the following:
IND 14,100.000
L = 7.8 uH
 The top line indicates the mode and the frequency
 The bottom line indicates the inductance in uH
Inductance values must be within the measurement range of the instrument. Given that the
maximum impedance specification for the analyzer is 2000 Ω, the display will show a numeric
value only when the reactance is less than this value. The formula to calculate the inductance is
thefollowing:
XL 2piF L
Off Mode
In this mode it is disabled the DDS and the impedance measurements.It is provided a RF level
measurement mode where the measured signal level is displayed in the second line of the

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display as a bar graph. This will be useful to know if the antenna is receiving a near RF field
which can interfere with the measurements.
OFF
 


BAND
The BAND button allows selecting the working frequency band within the bands available.
Pressing this button sequentially selects the next higher band which value is shown in the LCD,
and it is changed the frequency. If it is the first time accessing the band, the frequency will be set
to the middle value. Otherwise it will be set the previous frequency value, since this is stored
when changing the band.
Band
Lower
Frequency
Middle
Frequency
Upper
Frequency
160M
1,000.000
1,800.000
2,000.000
80M
2,000.000
3,700.000
5,000.000
40M
5,000.000
7,100.000
8,000.000
30M
8,000.000
10,100.000
11,000.000
25M
11,000.000
12,000.000
13,000.000
20M
13,000.000
14,100.000
17,000.000
17M
17,000.000
18,100.000
19,000.000
15M
19,000.000
21,000.000
23,000.000
12M
23,000.000
24,900.000
26,000.000
11M
26,000.000
27,000.000
28,000.000
10M
28,000.000
29,000.000
31,000.000
8M
31,000.000
40,000.000
49,000.000
6M
49,000.000
51,000.000
53,000.000
SCAN
Pressing the SCAN pushbutton will automatically sweep the antenna analyzer test signal across
the band range previously selected, incrementing from the lower frequency limit to the upper

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frequency limit, in steps according the programmed step value. During the scan the SWR is
measured and updated on the screen as well as the current frequency value. Each SWR value
is compared to previous value in order to determine if a minima, or a “dip”, has occurred at this
point in the scan. If so, that data point is stored for later display. Besides the 2:1 points are
stored in order to determine the bandwidth. An example screen during the scan is the following
(frequencyand SWR are updated continuously):
SCAN 14,100.200
1.30
Notice that when detected the 2:1 SWR points the buzzer is sounded to alert the user of the
event. After the scan process the instrument will show the bandwidth and after pressing any key
the instrument will switch to impedance mode with the frequency set to the frequency value
corresponding to the minimum SWR point.
BW 35.000
Press any key
In the case of not finding a resonance point the unit will display the following error message on
the screen.
Err No Matching
Press any key
CONFIG
Successively pressing the CONFIG button you can select one of the MR300 configuration
modes and extended funtions. To select either option you need to press the button VAL and for
exit you need pressing the button CAN.
PC Link
The PC Link function lets you control the MR300 from your PC using the USB connection.
The PC USB driver provides an emulation of a COM port and the MR300 provides a
command interface so you can be control the instrument from a terminal program such as
HyperTerminal or anyother program designed for this purpose, e.g. PCC-SARK100.
To use this feature you must have installed the USB driver, see Appendix A: and connect the
USB cable. The COM port setting is 57600, 8, n, 1, with no hardware flow control. By entering
this function the analyzer will send the following text to the terminal and will display the command
prompt:
SARK SWR Analyzer V05
>>

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The available commands are described in Appendix C: These can be typed from the
HyperTerminal window and the results will be returned to the terminal. The MR300 will show
the last processed command in the bottom line of the LCD.
Step Size
This function allows you to change the value of the frequency step for the SCAN and for the
increase/decrease frequency buttons for the impedance measurement modes. Successively
pressing the CONFIG button you can select one of the step values. To select either value you
need to press the button VAL and for exit you need pressing the button CAN.
The following values are available: 10Hz, 100Hz, 1kHz, 10kHz, and 100kHz.
SuspendTimeout
This feature allows you to program the user idle time for the automatic power-save feature.
Successively pressing the CONFIG button you can select one of the idle time values. To select
either value you need to press the button VAL and for exit you need pressing the button CAN.
The following values are available: Off (disabled), 30 seconds, 60 seconds, and 90 seconds.
Calibrate
This function allows calibrating the instrument in order to get better accuracy. By entering this
function the user is instructed to follow a series of steps which are described in detail in the
Appendix B:
Software Load
Don’t update software.

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4 Uses for an Antenna Analyzer
The MR300 antenna analyzer is a useful tool for the amateur radio station or the
homebrewer’s workbench. This section will describe the basic uses, as well some advanced
techniques for which you can use the analyzer to get intermediate measurements in order to
compute the desired result.
4.1 AntennaMeasurements
The antenna is simply connected to the analyzer RF output and the analyzer is set to the desired
frequency. The instrument measures the SWR, impedance, resistance, and reactance. The
SCAN function will be helpful to automatically find the resonance frequency and the bandwidth of
the antenna.
4.2 Measure Feed Point Impedance
Connecting the analyzer directly at the antenna terminals or remotely through a halfwavelength
of transmission line allows direct measurement of the antenna terminal impedance. This is often
useful with vertical antennas.
A matching network can be connected to the antenna and then adjusted for best SWR on the
analyzer.
4.3 Measure Ground Losses
With short vertical antennas, measuring the impedance directly at the feedpoint allows
estimation of ground loss or loading coil loss. For example a ¼ wave vertical will have a
resistance of about 36 ohms at resonance.Anyhigher reading indicates ground loss.
Similarly shorter antennas (when resonated) will have lower resistance values. Reading a good
SWR may mean excess loss and measuring the actual impedance allows gauging just how
much loss.
4.4 AdjustAntenna Tuners
The analyzer can be used to adjust an antenna tuner for a perfect match without the need to
transmit a strong signal from the station rig. The analyzer uses only milliwatts of power lessening
the possibilityof causing interference, see Figure 3.
4.5 CapacitorMeasurement
There are several ways to measure capacitance with the MR300. The simplest is to connect
the capacitor across the RF output connector and select Capacitance from the Mode pushbutton
menu. You can accurately measure capacitance values as long as the reactance at the
measurement frequency is within the impedance measurement specifications of the analyzer
(about 10 to 2000 Ω).

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Another way to measure capacitance with the MR300 is to measure it in a series resonant
circuit. (See Figure 1 and Figure 5). You will need an inductor of known value and a 51 Ω
carbon composition or film resistor. It is recommended that a small 5% tolerance choke with an
inductance of between 1 and 10 uH be used. Common RF chokes are fine and can be obtained
from most full-service mail order component suppliers.
Figure 1
To measure capacitance by the second method, connect the components as shown in Figure 1.
Then adjust the operating frequency for lowest SWR and record the frequency. Now you can
calculate the capacitance using the formula:
C  25530
F F L
Where C is the capacitance in picofarads, F is the frequency in MHz and L is the inductance in
microhenries.
4.6 InductorMeasurement
There are several ways to measure inductance with the MR300. The simplest way is to
connect the inductor across the RF output connector and select Inductance from the Mode
pushbutton menu. You can accurately measure inductor values as long as the reactance at the
measurement frequency is within the impedance measurement specifications of the analyzer
(about 10 to 2000 Ω).
Another way to measure inductance with the MR300 is to measure it in a series resonant
circuit. (See Figure 1 and Figure 5). You will need an capacitor of known value and a 51 Ω
carbon composition or film resistor. The capacitor should have a tolerance no wider than 10%
and have a low loss dielectric composition such as NP0 ceramic or mica. A capacitance value of
about 100 pf is appropriate for many RF measurements.
You can make your own precision capacitor from a piece of coaxial cable. Common RG-58 type
50 ohm coax has a capacitance of about 29 to 30 pf. For example RG58/U is specified at 28.8 pf
per foot so a length of about 3.5 ft –including a 1” pigtail for attachment will serve as a fairly
accurate 100 pf capacitor.

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To measure inductance by the second method, connect the components as shown in as Figure
6. Adjust the operating frequency for lowest SWR and record the frequency. Now you can
calculate the capacitance using the formula:
L 25530
F F C
Where L is the inductance in microhenries, F is the frequency in MHz and C is the capacitance
in picofarads.
4.7 Measure Inductor Q
The Q of an RF inductor can be measured with a very simple setup. First measure the inductive
reactance XL of the inductor and record this value. Now connect it to the Analyzer as shown
below in Figure 2.
Figure 2
Capacitor C must be chosen to resonate with L at the frequency where you want to measure the
inductor’s Q. The Inductor and Capacitor Measurement section of this manual shows how this
capacitor value can be determined. Now tune the Analyzer for the lowest R (resistance) value
with a reading of zero X (reactance). If R is above 10 ohms you can now calculate inductor Q
using the formula:
Q  XL
R
If R is less than 10 Ωa slightly different method needs to be used. In this case use the test setup
shown in Figure 1. Adding the noninductive (carbon composition or film) ¼ or ½ watt 51 Ω
resistor allows more accurate measurement of the series resistance of the inductor.
Again tune the analyzer for lowest R (resistance) value with a reading of zero X (reactance).
Record this resistance value. Now connect the 51 Ωresistor directly across the analyzer’s RF
output connector and measure its exact value at the resonance frequency and record it. Next
subtract the exact 51 Ωresistor value from the measured R value and use this new resistance in
the above formula to calculate the Q value.

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4.8 Transmission line characteristic impedance
The characteristic impedance of coaxial, twisted pair, open wire or ribbon type feedlines can be
estimated using the MR300. Practical measurements are best done in the mid-tuning range of
the instrument where accuracy is optimum and feedline lengths are reasonable; so this
procedure will be performed between 7 and 21 MHz.
The measurements need to be done with a transmission line over frequencies where the
feedline is at about 1/8 wavelength at the low frequency end and something over ¼ wavelength
at the high frequency end, so it is recommended that a length of about 4.9m (16 feet) is used.
Connect the near end of the feedline to the MR300. Connect a 1000 Ωcarbon or Cermet
potentiometer to the far end with leads no longer than 2.5 cm (one inch) or so. Initially set the pot
to its highest value, see Figure 6.
Ensure that the transmission line is supported for its entire length in a fairly straight line and kept
several inches from any conductive surface or material. This is important to minimize any
detuning effects. Ideally the line should be dressed along to top of a wooden fence or supported
byfiber rope or string.
Now tune the MR300 over the range of 7-to-21 MHz while noting the resistive (R) and reactive
(X) values. More than likely they will vary widely over the tuning range. Now readjust the
potentiometer to a slightly lower value and do another sweep while observing the variation of R
and X values. At some potentiometer setting the R value will vary very little over the tuning range
while the X value will remain near zero. This is the estimated characteristic resistance.
4.9 Transmission line losses
Transmission line loss for 50-ohm feedlines can be easily measured using the analyzer. The
basic operating principle is that loss in transmission lines attenuates RF sent through them.
When the line is connected to the analyzer and the far end is short or opencircuited there is a
theoretically infinite SWR. If the feedline had zero loss this would be the case. However since
any real line has some loss both the forward and reflected power are attenuated and a finite
SWR is measured.
For most good quality new coaxial feedlines the loss at HF frequencies will not exceed several
dB per 30 meters (hundred feet); however as they age the dielectric becomes lossy to it is a
good idea to periodically check the loss. Measurement is simple. All you have to do it is to
remove the load, short-circuit the far end of the feedline, and then connect the near end to the
analyzer’s RF output connector. Measure the SWR and refer to table below for the approximate
corresponding loss. If the measured SWR is above 9:1 that’s good news since the SWR then is
less than 1 dB. If you vary the analyzer frequency you will see that SWR decreases with
frequencyindicating that loss increases at higher frequencies.

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Approx Loss Measured SWR
1 dB 9:1
2 dB 4.5:1
3 dB 3:1
4 dB 2.3:1
5 dB 2:1
6 dB 1.7:1
7 dB 1.6:1
8 dB 1.5:1
9 dB 1.4:1
10 dB 1.3:1
4.10 Transmission line stub lengths
Measurement of quarter and half wave transmission line stubs can be performed regardless of
the transmission line characteristic impedance. The method relies on the fact that an open-
circuited quarter wavelength line or a short-circuited line acts like a precise short circuit at the
chosen frequencyof operation.
With either type of feedline first cut it about 10% longer than the desired length, taking the
appropriate velocity factor into account. The velocity factor of common feedlines is available
from manufacturer’s literature or references such as the ARRL Antenna Book. If you cannot find
the value or if you are using a custom type of feedline, the “Velocity Factor Measurement”
section in this manual provides a way to determine this value. The following formulas can be
used to estimate the length of transmission line required.
For a half-wavelength stub the length is:
L 150000VF
F
Where L is the length in cm, VF is the velocityfactor and F is the operating frequency in MHz for
the stub.
Similarlyfor a quarter-wave stub use the formula:
L 7500VF
F

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To determine the length of a half wave stub, connect the near end of the transmission line
through a 51 Ωresistor as shown in Figure 4 to the analyzer’s RF output connector. Short circuit
the two leads at the far end of the half wave stub.
Ensure that the transmission line is supported for its entire length in a fairly straight line and kept
several inches from any conductive surface or material. This is important to minimize any
detuning effects. Ideally the line should be dressed along to top of a wooden fence or supported
byfiber rope or string.
Now tune the MR300 for minimum SWR and note the frequency. This is the frequencywhere
the transmission line is exactly a half wavelength long. If the initial length was chosen properly it
should be below the desired frequency. If so, cut off a short length making sure the far end is still
short-circuited, and repeat until resonance is achieved at the desired frequency.
For a quarter wave stub, the above procedure can be used except, of course that the length is
different and that the far end needs to be opencircuited.
4.11 Transmission line velocity factor
Velocity factor of a transmission line can be measured using techniques similar to the ones used
for measuring quarter and half wave stubs. The procedure can be performed at any frequency
that the MR300 tunes but it is most practical in the vicinity of 10 MHz where line lengths are
reasonable and instrument accuracyis optimum.
Either a quarter wave or half wave length can be used; but using the shorter length consumes
less feedline if it will be discarded after the measurement. Begin by cutting a quarter wavelength
of feedline using the formula:
L 7500VF
F
For a frequencyof 10 MHz and assuming a VF (VelocityFactor) of 1.
Now connect the near end of the feedline to a 51 Ωresistor as shown in Figure 7 then to the
analyzer’s RF output connector. The far end must be open circuited. Ensure that the
transmission line is supported for its entire length in a fairly straight line and kept several inches
from any conductive surface or material. This is important to minimize any detuning effects.
Ideally the line should be dressed along to top of a wooden fence or supported by fiber rope or
string.
Now tune the MR300 for lowest SWR and note the frequency. VF can now be calculated
using the formula:
VF 10
F
Where F is the measured frequencyin MHz.

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Figure 3,Adjust antenna tuners
Figure 4, ,Adjust antenna tuners
Figure 5, Capacitor or inductor measurement
Figure 6, Determining feedline characteristic impedance
Figure 7, Determining feedline velocity factor

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5 Command software on PC
The MR300 is controllable from the PC and allows the collection of measurements to be
processed by an analysis program. In the project website you can find a simple command line
program, PCC-SARK100, which performs control and data capture from the MR300 and
generates a data file compatible with Excel macro ZPlots from Dan Maguire AC6LA. This macro
performs the analysis of the measures and displays them in different graphs.
URL: http://www.lxqqfy.com/index/files.php?id=MR100_cmd
The PCC-SARK100 is a simple command line program which scans in the selected frequency
range and stores the measurement results in a file format supported byZPlots.
Usage:
 PCC-SARK100 -c<com port> -s<start freq> -e<end freq> -t<step value> -o<output file>
Where:
 -c<com port name> COM port name
 -s<start freq> Start frequencyin Hertz
 -e<end freq> End frequency in Hertz
 -t<step> Step value in Hertz
 -o<outputfile> Output file name (without path)
Example:
》 PCC-SARK100-cCOM5 -s14000000-e16000000-t10000-oDipole20m.csv
ZPlots
ZPlots is an Excel macro developed by Dan Maguire AC6LA, which provides the data analysis
and display graphs of the impedance data captured by the MR300 antenna. Usage is very
simple, you select the file captured by PCC-SARK100 and automatically displays a
representation of the actions of the antenna to the SWR, resistance, reactance, etc.. It also
represents Smith chart format. In the following pages there are examples of ZPlots graphs.
The complete manual of the original program is available on the project website.

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6 Windows software on PC
MR300 can also be connected with the Windows application, download from lxqqfy.com.
URL: http://www.lxqqfy.com/index/files.php?id=MR300_win
1. Using USB to connect computers and MR300.
2. Click the 'MODE' button on the MR300 to enter the 'PC Link' interface.
3. Click the 'DOWN' button on the MR300 to enter the 'PC Link' 'Waiting Link' interface.
4. Open the PC software, Select 'Serial port' and click 'Open' .
5. If the connection is successful, MR300 will enter the 'PC Link' 'scan' interface.
6. OK.

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7 App software on Android
MR300 also connected via Bluetooth and mobile phone, download from lxqqfy.com.
URL: http://www.lxqqfy.com/index/files.php?id=MR300_app
Bluetooth connection password: 1234
1. Using USB to connect computers and MR300.
2. Click the 'MODE' button on the MR300 to enter the 'PC Link' interface.
3. Click the 'DOWN' button on the MR300 to enter the 'PC Link' 'Waiting Link' interface.
4. Bluetooth connection (Password: 1234).
5. Open Android software, Click the ‘Connect’button, and select first Bluetooth.
6. If the connection is successful, MR300 will enter the 'PC Link' 'scan' interface.
7. OK.