RigExpert - AA-35ZOOM - 0.06 - 35 MHz - 25, 50, 75 & 100 Ω

Reference: AA-35ZOOM

Condition: New product

The AA-35 ZOOM is a portable, self-calibrating analyzer, designed for measuring SWR (standing wave ratio), return loss, cable loss, as well as other parameters of cable and antenna systems in the range of 60 kHz to 35 MHz, with incredible ZOOM capability.

The following tasks are easily accomplished by using this analyzer:

Rapid check-out of an antenna

Tuning an antenna to resonance

Comparing characteristics of an antenna before and after specific event (rain, hurricane, etc.)

Making coaxial stubs or measuring their parameters

Cable testing and fault location, measuring cable loss and characteristic impedance

Measuring capacitance or inductance of reactive loads

More details

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RigExpert AA-35 ZOOM – Specifications

Frequency range: 0.06 to 35 MHz

Frequency entry: 1 Hz resolution

Measurement for 25, 50, 75 and 100-Ohm systems

SWR measurement range: 1 to 100 in numerical modes,
1 to 10 in chart modes

SWR display: numerical or analog indicator

R and X range: 0…10000, -10000…10000 in numerical modes,
0…1000, -1000…1000 in chart modes

Display modes:
–    SWR at single frequency
–    SWR, return loss, R, X, Z, L, C and phase angle at single frequency
–    SWR chart, 100 points
–    R, X chart, 100 points

Non Volatile memory:
– 10 slots to save measurement results

RF output:
–    Connector type: UHF (SO-239)
–    Output signal shape: square, 0.06 to 35 MHz
–    Output power: +13 dBm (at 50 Ohm load)

Power:
–    Two 1.5V alkaline batteries, type AA
–    Two 1.2V Ni-MH batteries, type AA *
–    Max. 4 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

Interface:
–    320×240 color TFT display
–    6×3 keys on the water-proof keypad
–    Multilingual menus and help screens
–    USB connection to a personal computer

Dimensions: 103 mm x 207 mm x 37 mm (4.1 in x 8.1 in x 1.4 in)

Operating temperature: 0…40 °C (32…104 °F)

Weight: 310 g (10.9 Oz) w/o batteries

Warranty: 2 years

GTIN-13: 4820185420099

RigExpert AA-35 ZOOM is made in Ukraine.

Specifications are subject to change without notice.

* Batteries are not included with the analyzer.

Structure diagram

The structure diagram of RigExpert AA-35 ZOOM is located below:

how-it-works

The “brain” of the analyzer is STM 32-bit RISC microcontroller. It controls a Si5351 PLL chip running at 500 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 brigde 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 1.5 kHz.This signal is then filtered and fed on the 12-bit ADC of the microcontroller. The 320×240 color TFT display and the 6×3 keys keypad are connected directly to the CPU. The USB interface allows connecting the analyzer to the PC. The analyzer uses internal Flash memory to store measurement results (10 memory slots).

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.