Further information added.
This commit is contained in:
klaute
parent
6d5f63d640
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2911b1f245
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The following text was copied from the eBay.co.uk article website.
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I am not the author of this information - it is only added for further information about ZL1CVD's work:
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The TenaTesta is a USB device which you can power from a smart phone, USB power bank or even a PC. A standard micro-USB cable is required (not included). To operate, simply plug it into a USB power source, connect the antenna to be tested, select the beginning and end frequency then double click the start button to start sweeping the selected frequency range. The small 1.8” color display then graphs forward power (blue), reverse power (red) and approximate SWR (yellow). At the end of the sweep, it then indicates the 1st frequency that gave the best SWR for the sweep (1st frequency with closest match to 50 ohms). For antenna's where several frequencies are close to 50 ohms, only the 1st is indicated. You can of coarse narrow things down by reducing the gap between start and stop frequencies.
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How it works
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------------
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At the heart of the TenaTesta is an Arduino Nano compatible microcontroller which controls a Silicone Labs CMOS PLL clock generator that is feed into a Wheatstone impedance bridge. The microcontroller measures both forward and reverse power, calculates SWR and plots the results as a graph on a 1.8” TFT color display.
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Limitations
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This is a cost effective approach that works well for me. However its not perfect and there are several limitations to this design:
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PLL clock output is a square wave
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---------------------------------
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This means the signal generated is full of harmonics which could result in a false SWR readings. To help overcome this issue, the clock output is kept to a bare minimum and multiple power readings are averaged before SWR is calculated. In practice I have not found harmonic related issues. It is likely that sweeping a massive range may give false readings but doing so is somewhat pointless due to the resolution of the display.
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Wheatstone impedance bridge
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---------------------------
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The Wheatstone impedance bridge checks resistance and not the complex impedance's that can exist in some antenna designs. Ideally a Bruene directional coupler would be used but I felt this would take up too much board space, not have the bandwidth and be harder to replicate. I am pleased with the results of the Wheatstone bridge with my wire type HF antennas. I personally find this compact tool ideal for quick antenna measurements. For tricky antennas, I use a bench analyzer.
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Arduino program
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---------------
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I am not a professional programmer and as such the code could possibly be improved. It does however do what I want and the source code is available to those who purchase the TenaTesta (assembled, PCB or kit) at no additional charge for private non-commercial use.
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Upgradeable & a great Arduino learning platform
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-----------------------------------------------
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The TenaTesta makes a great Microcontroller learning platform. By installing the Arduino programming environment onto you PC, Mac or Linux box, you will be able to examine and modify my code. You'll be able to make changes, compile and upload via USB.
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3.3v / 5v Warning
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-----------------
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The PLL chip used in this design is rated for 3.3v operation only. The board design does not cater for a microcontroller operating at a different voltage to the PLL. In theory, a 3.3v PLL connected to a 5v microcontroller should destroy the PLL. In practice, all units I have assembled to date have worked fine. It is your choice to assemble this with either 3.3V or 5V Arduino Nano 32u4 microcontroller. But be aware the 3.3v 32u4 Nano operates at a much slower clock frequency - the display will be slower to change and update, keys will be slower to respond.
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@ -28,6 +28,7 @@ LIBS:opto
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LIBS:atmel
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LIBS:contrib
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LIBS:valves
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LIBS:TenaTesta_ZL1CVD-cache
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EELAYER 25 0
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EELAYER END
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$Descr A4 11693 8268
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@ -109,10 +110,10 @@ F 3 "" H 2500 4000 50 0000 C CNN
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@ -131,10 +132,10 @@ F 3 "" H 2150 4500 50 0000 C CNN
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@ -142,10 +143,10 @@ F 3 "" H 3400 4500 50 0000 C CNN
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F 3 "" H 3400 5300 50 0000 C CNN
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-1 0 0 1
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F 3 "" H 2850 6350 50 0000 C CNN
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0 1 1 0
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F 3 "" H 5100 2050 50 0000 C CNN
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0 1 1 0
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F 2 "" H 3500 2800 50 0000 C CNN
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F 3 "" H 3500 2800 50 0000 C CNN
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1 0 0 -1
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F 3 "" H 4550 2800 50 0000 C CNN
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-1 0 0 -1
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$EndComp
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0 -1 -1 0
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0 -1 -1 0
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Wire Wire Line
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$Comp
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L GND #PWR?
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L GND #PWR2
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U 1 1 57D82504
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F 2 "" H 2250 2350 50 0000 C CNN
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Wire Wire Line
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5000 3750 5000 3400
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$Comp
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L GND #PWR?
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L GND #PWR7
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U 1 1 57D83353
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1 0 0 -1
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$EndComp
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$Comp
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L GND #PWR?
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L GND #PWR9
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U 1 1 57D833E2
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P 5550 3500
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Connection ~ 3400 4750
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$Comp
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L GND #PWR?
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L GND #PWR3
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U 1 1 57D83F2B
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1 0 0 -1
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$EndComp
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$Comp
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L GND #PWR?
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L GND #PWR6
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U 1 1 57D84180
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F 3 "" H 3600 5150 50 0000 C CNN
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Connection ~ 2750 5550
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$Comp
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L +5V #PWR?
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Text Label 5650 2050 0 60 ~ 0
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CLK0
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$Comp
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Wire Wire Line
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9900 2050 10000 2050
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$Comp
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L GND #PWR?
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Text Label 9650 1950 2 60 ~ 0
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CLK0
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$Comp
|
||||
L CONN_01X07 P?
|
||||
L CONN_01X07 P4
|
||||
U 1 1 57D8571B
|
||||
P 8300 2000
|
||||
F 0 "P?" H 8300 2400 50 0000 C CNN
|
||||
F 0 "P4" H 8300 2400 50 0000 C CNN
|
||||
F 1 "CONN_01X07" V 8400 2000 50 0000 C CNN
|
||||
F 2 "" H 8300 2000 50 0000 C CNN
|
||||
F 3 "" H 8300 2000 50 0000 C CNN
|
||||
|
|
@ -484,10 +485,10 @@ Wire Wire Line
|
|||
Wire Wire Line
|
||||
7800 2300 8100 2300
|
||||
$Comp
|
||||
L +5V #PWR?
|
||||
L +5V #PWR14
|
||||
U 1 1 57D85B32
|
||||
P 7800 2300
|
||||
F 0 "#PWR?" H 7800 2150 50 0001 C CNN
|
||||
F 0 "#PWR14" H 7800 2150 50 0001 C CNN
|
||||
F 1 "+5V" H 7800 2440 50 0000 C CNN
|
||||
F 2 "" H 7800 2300 50 0000 C CNN
|
||||
F 3 "" H 7800 2300 50 0000 C CNN
|
||||
|
|
@ -495,10 +496,10 @@ F 3 "" H 7800 2300 50 0000 C CNN
|
|||
0 -1 -1 0
|
||||
$EndComp
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR15
|
||||
U 1 1 57D85C77
|
||||
P 8000 2400
|
||||
F 0 "#PWR?" H 8000 2150 50 0001 C CNN
|
||||
F 0 "#PWR15" H 8000 2150 50 0001 C CNN
|
||||
F 1 "GND" H 8000 2250 50 0000 C CNN
|
||||
F 2 "" H 8000 2400 50 0000 C CNN
|
||||
F 3 "" H 8000 2400 50 0000 C CNN
|
||||
|
|
@ -510,10 +511,10 @@ Wire Wire Line
|
|||
Wire Wire Line
|
||||
8000 2200 8000 2400
|
||||
$Comp
|
||||
L C C?
|
||||
L C C6
|
||||
U 1 1 57D85D32
|
||||
P 7350 2050
|
||||
F 0 "C?" H 7375 2150 50 0000 L CNN
|
||||
F 0 "C6" H 7375 2150 50 0000 L CNN
|
||||
F 1 "100n" H 7375 1950 50 0000 L CNN
|
||||
F 2 "" H 7388 1900 50 0000 C CNN
|
||||
F 3 "" H 7350 2050 50 0000 C CNN
|
||||
|
|
@ -521,10 +522,10 @@ F 3 "" H 7350 2050 50 0000 C CNN
|
|||
-1 0 0 1
|
||||
$EndComp
|
||||
$Comp
|
||||
L +5V #PWR?
|
||||
L +5V #PWR11
|
||||
U 1 1 57D85E0F
|
||||
P 7350 1800
|
||||
F 0 "#PWR?" H 7350 1650 50 0001 C CNN
|
||||
F 0 "#PWR11" H 7350 1650 50 0001 C CNN
|
||||
F 1 "+5V" H 7350 1940 50 0000 C CNN
|
||||
F 2 "" H 7350 1800 50 0000 C CNN
|
||||
F 3 "" H 7350 1800 50 0000 C CNN
|
||||
|
|
@ -532,10 +533,10 @@ F 3 "" H 7350 1800 50 0000 C CNN
|
|||
1 0 0 -1
|
||||
$EndComp
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR12
|
||||
U 1 1 57D85E65
|
||||
P 7350 2300
|
||||
F 0 "#PWR?" H 7350 2050 50 0001 C CNN
|
||||
F 0 "#PWR12" H 7350 2050 50 0001 C CNN
|
||||
F 1 "GND" H 7350 2150 50 0000 C CNN
|
||||
F 2 "" H 7350 2300 50 0000 C CNN
|
||||
F 3 "" H 7350 2300 50 0000 C CNN
|
||||
|
|
@ -559,10 +560,10 @@ SDA
|
|||
Wire Wire Line
|
||||
7500 4250 7700 4250
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR13
|
||||
U 1 1 57D86AF6
|
||||
P 7500 4250
|
||||
F 0 "#PWR?" H 7500 4000 50 0001 C CNN
|
||||
F 0 "#PWR13" H 7500 4000 50 0001 C CNN
|
||||
F 1 "GND" H 7500 4100 50 0000 C CNN
|
||||
F 2 "" H 7500 4250 50 0000 C CNN
|
||||
F 3 "" H 7500 4250 50 0000 C CNN
|
||||
|
|
@ -570,10 +571,10 @@ F 3 "" H 7500 4250 50 0000 C CNN
|
|||
0 1 1 0
|
||||
$EndComp
|
||||
$Comp
|
||||
L +5V #PWR?
|
||||
L +5V #PWR17
|
||||
U 1 1 57D86BE1
|
||||
P 9000 4250
|
||||
F 0 "#PWR?" H 9000 4100 50 0001 C CNN
|
||||
F 0 "#PWR17" H 9000 4100 50 0001 C CNN
|
||||
F 1 "+5V" H 9000 4390 50 0000 C CNN
|
||||
F 2 "" H 9000 4250 50 0000 C CNN
|
||||
F 3 "" H 9000 4250 50 0000 C CNN
|
||||
|
|
@ -583,10 +584,10 @@ $EndComp
|
|||
Wire Wire Line
|
||||
8800 4250 9000 4250
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR16
|
||||
U 1 1 57D86CAF
|
||||
P 9000 4050
|
||||
F 0 "#PWR?" H 9000 3800 50 0001 C CNN
|
||||
F 0 "#PWR16" H 9000 3800 50 0001 C CNN
|
||||
F 1 "GND" H 9000 3900 50 0000 C CNN
|
||||
F 2 "" H 9000 4050 50 0000 C CNN
|
||||
F 3 "" H 9000 4050 50 0000 C CNN
|
||||
|
|
@ -614,10 +615,10 @@ A1
|
|||
Text Label 9000 5050 0 60 ~ 0
|
||||
A0
|
||||
$Comp
|
||||
L CONN_01X15 P?
|
||||
L CONN_01X15 P3
|
||||
U 1 1 57D8755C
|
||||
P 7900 4650
|
||||
F 0 "P?" H 7900 5450 50 0000 C CNN
|
||||
F 0 "P3" H 7900 5450 50 0000 C CNN
|
||||
F 1 "CONN_01X15" V 8000 4650 50 0000 C CNN
|
||||
F 2 "" H 7900 4650 50 0000 C CNN
|
||||
F 3 "" H 7900 4650 50 0000 C CNN
|
||||
|
|
@ -625,10 +626,10 @@ F 3 "" H 7900 4650 50 0000 C CNN
|
|||
1 0 0 -1
|
||||
$EndComp
|
||||
$Comp
|
||||
L CONN_01X15 P?
|
||||
L CONN_01X15 P5
|
||||
U 1 1 57D87619
|
||||
P 8600 4650
|
||||
F 0 "P?" H 8600 5450 50 0000 C CNN
|
||||
F 0 "P5" H 8600 5450 50 0000 C CNN
|
||||
F 1 "CONN_01X15" V 8700 4650 50 0000 C CNN
|
||||
F 2 "" H 8600 4650 50 0000 C CNN
|
||||
F 3 "" H 8600 4650 50 0000 C CNN
|
||||
|
|
@ -644,10 +645,10 @@ SDA
|
|||
Text Label 9000 4550 0 60 ~ 0
|
||||
SCL
|
||||
$Comp
|
||||
L C C?
|
||||
L C C7
|
||||
U 1 1 57D87F1E
|
||||
P 9250 5150
|
||||
F 0 "C?" H 9275 5250 50 0000 L CNN
|
||||
F 0 "C7" H 9275 5250 50 0000 L CNN
|
||||
F 1 "100n" H 9275 5050 50 0000 L CNN
|
||||
F 2 "" H 9288 5000 50 0000 C CNN
|
||||
F 3 "" H 9250 5150 50 0000 C CNN
|
||||
|
|
@ -657,10 +658,10 @@ $EndComp
|
|||
Wire Wire Line
|
||||
8800 5150 9100 5150
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR18
|
||||
U 1 1 57D88248
|
||||
P 9500 5150
|
||||
F 0 "#PWR?" H 9500 4900 50 0001 C CNN
|
||||
F 0 "#PWR18" H 9500 4900 50 0001 C CNN
|
||||
F 1 "GND" H 9500 5000 50 0000 C CNN
|
||||
F 2 "" H 9500 5150 50 0000 C CNN
|
||||
F 3 "" H 9500 5150 50 0000 C CNN
|
||||
|
|
@ -670,10 +671,10 @@ $EndComp
|
|||
Wire Wire Line
|
||||
9400 5150 9500 5150
|
||||
$Comp
|
||||
L +5V #PWR?
|
||||
L +5V #PWR4
|
||||
U 1 1 57D888AD
|
||||
P 3150 4950
|
||||
F 0 "#PWR?" H 3150 4800 50 0001 C CNN
|
||||
F 0 "#PWR4" H 3150 4800 50 0001 C CNN
|
||||
F 1 "+5V" H 3150 5090 50 0000 C CNN
|
||||
F 2 "" H 3150 4950 50 0000 C CNN
|
||||
F 3 "" H 3150 4950 50 0000 C CNN
|
||||
|
|
@ -681,10 +682,10 @@ F 3 "" H 3150 4950 50 0000 C CNN
|
|||
1 0 0 -1
|
||||
$EndComp
|
||||
$Comp
|
||||
L MCP6002 U?
|
||||
L MCP6002 U1
|
||||
U 1 1 57D88C5F
|
||||
P 2750 5150
|
||||
F 0 "U?" H 2750 5300 50 0000 L CNN
|
||||
F 0 "U1" H 2750 5300 50 0000 L CNN
|
||||
F 1 "MCP6002" H 2750 5000 50 0000 L CNN
|
||||
F 2 "" H 2650 5200 50 0000 C CNN
|
||||
F 3 "" H 2750 5300 50 0000 C CNN
|
||||
|
|
@ -692,10 +693,10 @@ F 3 "" H 2750 5300 50 0000 C CNN
|
|||
0 1 1 0
|
||||
$EndComp
|
||||
$Comp
|
||||
L MCP6002 U?
|
||||
L MCP6002 U1
|
||||
U 2 1 57D88D50
|
||||
P 4000 5150
|
||||
F 0 "U?" H 4000 5300 50 0000 L CNN
|
||||
F 0 "U1" H 4000 5300 50 0000 L CNN
|
||||
F 1 "MCP6002" H 4000 5000 50 0000 L CNN
|
||||
F 2 "" H 3900 5200 50 0000 C CNN
|
||||
F 3 "" H 4000 5300 50 0000 C CNN
|
||||
|
|
@ -727,10 +728,10 @@ Si5351 breakout board
|
|||
Text Notes 2150 1850 0 60 ~ 0
|
||||
ANT
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR5
|
||||
U 1 1 57D8AC18
|
||||
P 3300 4000
|
||||
F 0 "#PWR?" H 3300 3750 50 0001 C CNN
|
||||
F 0 "#PWR5" H 3300 3750 50 0001 C CNN
|
||||
F 1 "GND" H 3300 3850 50 0000 C CNN
|
||||
F 2 "" H 3300 4000 50 0000 C CNN
|
||||
F 3 "" H 3300 4000 50 0000 C CNN
|
||||
|
|
@ -738,10 +739,10 @@ F 3 "" H 3300 4000 50 0000 C CNN
|
|||
0 1 1 0
|
||||
$EndComp
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR1
|
||||
U 1 1 57D8ACE7
|
||||
P 2050 4000
|
||||
F 0 "#PWR?" H 2050 3750 50 0001 C CNN
|
||||
F 0 "#PWR1" H 2050 3750 50 0001 C CNN
|
||||
F 1 "GND" H 2050 3850 50 0000 C CNN
|
||||
F 2 "" H 2050 4000 50 0000 C CNN
|
||||
F 3 "" H 2050 4000 50 0000 C CNN
|
||||
|
|
@ -749,10 +750,10 @@ F 3 "" H 2050 4000 50 0000 C CNN
|
|||
0 1 1 0
|
||||
$EndComp
|
||||
$Comp
|
||||
L SW_PUSH SW?
|
||||
L SW_PUSH SW1
|
||||
U 1 1 57D8B330
|
||||
P 6050 5850
|
||||
F 0 "SW?" H 6200 5960 50 0000 C CNN
|
||||
F 0 "SW1" H 6200 5960 50 0000 C CNN
|
||||
F 1 "SW_PUSH" H 6050 5770 50 0000 C CNN
|
||||
F 2 "" H 6050 5850 50 0000 C CNN
|
||||
F 3 "" H 6050 5850 50 0000 C CNN
|
||||
|
|
@ -768,10 +769,10 @@ Wire Wire Line
|
|||
Text Label 6600 5850 0 60 ~ 0
|
||||
RESET
|
||||
$Comp
|
||||
L GND #PWR?
|
||||
L GND #PWR10
|
||||
U 1 1 57D8B741
|
||||
P 5650 5850
|
||||
F 0 "#PWR?" H 5650 5600 50 0001 C CNN
|
||||
F 0 "#PWR10" H 5650 5600 50 0001 C CNN
|
||||
F 1 "GND" H 5650 5700 50 0000 C CNN
|
||||
F 2 "" H 5650 5850 50 0000 C CNN
|
||||
F 3 "" H 5650 5850 50 0000 C CNN
|
||||
|
|
@ -780,4 +781,10 @@ F 3 "" H 5650 5850 50 0000 C CNN
|
|||
$EndComp
|
||||
Wire Wire Line
|
||||
5650 5850 5750 5850
|
||||
Text Notes 7050 6700 0 60 ~ 0
|
||||
ZL1CVD based SWR meter without the TFT display
|
||||
Text Notes 5750 5650 0 60 ~ 0
|
||||
Arduino reset
|
||||
Text Notes 3250 1850 0 60 ~ 0
|
||||
Wheatstone impedance bridge
|
||||
$EndSCHEMATC
|
||||
|
|
|
|||
Loading…
Reference in New Issue