Mainly, these are SWR (Standing Wave Ratio) and impedance measurement instruments (vector impedance analyzers).
Easy-to use measurement modes, as well as additional features such as connection to a personal computer (to plot Smith charts, etc.), make RigExpert AA-30 and AA-54 attractive for professionals and hobbyists. It is quite important that graphical display of various parameters over a wide frequency range is a key feature of these analyzers which significantly reduces the time required to adjust an antenna.
The following tasks are easily accomplished by using RigExpert AA-30 and AA-54:
- Rapid check-out of an antenna
- Tuning an antenna to resonance
- Antenna SWR and impedance measurement and comparison before and after specific event (rain, hurricane, etc.)
- Making coaxial lines or measuring their parameters
- Cable testing and fault location
- Measuring capacitance or inductance of reactive loads
Frequency range: AA-30: 0.1 to 30 MHz, AA-54: 0.1 to 54 MHz
Frequency entry: 1 kHz resolution
SWR measurement range: 1 to 10
SWR measurement for 50 and 75-Ohm systems
SWR display: numerical or easily-readable bar
R and X range: 0…1000, -1000…1000 in numerical mode, 0…200, -200…200 in graph mode
– SWR at single or multiple (AA-54 only) frequencies
– SWR, R, X, Z, L, C at single frequency
– SWR graph, 100 points
– R, X graph, 100 points
– Connector type: UHF (SO-239)
– Output signal shape: square, 0.1…10 MHz (AA-30) or 0.1…10.8 MHz (AA-54). For higher frequencies, third or fifth (AA-54) harmonics are used.
– Output power: about +13 dBm (at 50 Ohm load)
– Two 1.5V, alkaline batteries, type AA
– Two 1.2V, 1800…2700 mA·h, Ni-MH batteries, type AA *
– Max. 3 hours of continuous measurement, max. 2 days in stand-by mode when fully charged batteries are used
– When the analyzer is connected to a PC or a DC adapter with USB socket, it takes power from these sources
– 128×64 graphical backlit LCD
– 6×3 keys on the water-proof keypad
– AA-54: multilingual menus and help screens, AA-30:menus and help screens in English language
– USB connection to a personal computer
Dimensions: 22·10·3.6 cm (9·4·1.5”);
Operating temperature: 0…40 °C (32…104 °F)
Weight (including batteries): 400g (14 Oz)
Warranty: 2 years
RigExpert AA-30 and AA-54 are made in Ukraine.
GTIN-13: AA-30: 4820185420020, AA-54: 4820185420013
Specifications are subject to change without notice.
The structure diagram of the RigExpert AA-30/AA-54 Antenna Analyzer is located below:
The “brain” of the analyzer is Atmel 8-bit RISC microcontroller. It controls two AD9833 DDS chips running at 25 MHz and generating two sinusoidal signals. Both signals are low-pass filtered and then put through pulse shapers, producing two square signals with CMOS levels. Resistive bridge was chosen to measure parameters of a load because of its simplicity and good frequency response. The switch commutates two outputs of the bridge. After the switch, the signal is mixed with the second channel output to produce audio frequency of 1.7 kHz. A variable attenuator is used to maintain the audio signal level in the desired range. This signal is then filtered and fed into the 10-bit ADC of the microcontroller. There is a simple relationship between the measurement frequency, DDS frequencies and attenuator division ratio:
|1||0.1 … 10 MHz||0.1 … 10 MHz||DDS1 + 1.744 kHz||1||/25|
|2||10 … 30 MHz||3.333 … 10 MHz||DDS1 + 581 Hz||3||/3|
|3 (AA-54 only)||30 … 54 MHz||6 … 10.8 MHz||DDS1 + 349 Hz||5||/1|
The 128×64 graphical LCD and the 6×3 keys keypad are connected directly to the CPU. Also, the AA-54 is equipped with 128K of external Flash memory to store measurement results. The USB interface chip allows connecting the analyzer to the PC.
Close look at the bridge
This is a diagram of the resistive bridge and its connection to the mixer:
The switch which is controlled by the CPU feeds the signal from the certain side of the bridge to the mixer chip. When the load is totally active and its resistance is 50 Ω, the bridge is balanced and the switch outputs the same signal in both positions. This eliminates the need of calibration of the analyzer, also giving very good precision near SWR=1.
- RigExpert AA-30
- USB cable (optional, not included
in standard package)
- User’s manual
- Software manual
- CD with drivers and software
- Alkaline batteries
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