Sark-110 Antenna Analyser

In the PO Box the other day was a new toy. (this one is my birthday present to myself) 馃榾

IMG_1547 IMG_1609

I had been using a you kits FG-01聽for a and while and that device worked well, BUT… 聽it lacked some functions and stopped at 60Mhz. I had read and seen a lot about the little sark-110 unit, and decided to offer the you kits for sale and upgrade. So with the FG01 disposed off, an order for the sark was placed and a couple of days later it arrived.

The sark is basically a screen/box thats聽smaller than an iPhone, its a small screen with a USB plug on one end and a MMCX connector on the other side.

The device is very powerful! the list of features and functions is best seen on the device product website. It can be used to measure聽Complex impedance (series and parallel) and reflection coefficient in rectangular and polar form, VSWR, return loss, reflection power percentage, quality factor, equivalent capacitance, equivalent inductance. It has the ability to connect to some partner windows software and have this information driven from a computer as well.

Its very easy to use, plug it in, dial up the required range and press go, the screen comes back with the required information, you can use the preset ranges as well, or plug into the computer and do some other analysis. The device can also take screen shots in the field, you also have the ability to export the data as a .CSV file to plot later, it does Circular (smith chart) plots also. Its very powerful!

144mhz via triplexer

My 144Mhz vertical VSWR plot

IMG_1682OCFdipole-homesark_ocfdipole sark_TDR_mode OCFdipole-home

The OCF dipole at home (on sark and via software)

sark_TDR_mode

The TDR mode (this isn’t ideal – measuring the coax on OCF dipole – 18m correct!)

sark_000 sark_001all sark_003 sark_004 sark_006 sark_001

some direct device screenshots

The developer is very active with firmware updates and development of the device is ongoing with new features and functions added frequently.

The TDR function is of interest to me, and as part of this, I am building up a set of calibration tools following the notes at IN3OTD’s聽(and from others) websites. When the bits required to make these up arrive, ill post a blog about their construction.

The device is really is beyond my current requirement, however, it should allow a lot of tinkering and antenna development into the future, and I do like to tinker..

Specifications

Synthesizer

路聽聽聽聽聽聽聽Direct Digital Synthesis with 1Hz resolution

路聽聽聽聽聽聽聽Sine wave output

路聽聽聽聽聽聽聽Frequency range from 0.1 to 230Mhz

Measured Parameters

Complex impedance (series and parallel) and reflection coefficient in rectangular and polar form, VSWR, return loss, reflection power percentage, quality factor, equivalent capacitance, equivalent inductance

Operating Modes

Scalar Chart, Smith Chart, Single Frequency, Cable Test (TDR), Field, Multi-band, Signal Generator, Computer Control

Features Common to Most Modes

路聽聽聽聽聽聽聽Presets for amateur radio bands

路聽聽聽聽聽聽聽Adjustable reference impedance

路聽聽聽聽聽聽聽Save to disk and recall functions

路聽聽聽聽聽聽聽Three available fixed scale options and automatic scaling

路聽聽聽聽聽聽聽Presets for popular coaxial cables

路聽聽聽聽聽聽聽Add/subtract transmission line

路聽聽聽聽聽聽聽Black or white color schemes

路聽聽聽聽聽聽聽Adjustable plot trace widths

Scalar Chart Mode

路聽聽聽聽聽聽聽Graphical plot of two user-selected parameters in a rectangular chart

路聽聽聽聽聽聽聽Two markers with manual or automatic positioning

路聽聽聽聽聽聽聽Display detailed parameters for center frequency or any of the two marker positions

Smith Chart Mode

路聽聽聽聽聽聽聽Plots complex reflection coefficient in Smith Chart form

路聽聽聽聽聽聽聽Two markers with manual or automatic positioning

路聽聽聽聽聽聽聽Display detailed parameters for center frequency or either of the two marker positions

Single Frequency Mode

路聽聽聽聽聽聽聽Display all parameters for a single frequency

路聽聽聽聽聽聽聽Graphical representation of series and parallel impedance equivalent

路聽聽聽聽聽聽聽VSWR Audio feedback

Cable Test Mode

路聽聽聽聽聽聽聽Maximum length: about 250 m

路聽聽聽聽聽聽聽Displays step and impulse responses

Field Mode

路聽聽聽聽聽聽聽Graphical plot of one user-selected parameter in a scalar chart with enhanced legibility

路聽聽聽聽聽聽聽Display max and min values

Multi-band Mode

路聽聽聽聽聽聽聽Display rectangular charts for four bands simultaneously

Signal Generator Mode

路聽聽聽聽聽聽聽Precise RF signal generator with 1 Hz resolution

路聽聽聽聽聽聽聽Programmable output level from -73 dBm to -10 dBm

路聽聽聽聽聽聽聽Continuous and frequency sweep modes

路聽聽聽聽聽聽聽Linear, logarithmic, bi-linear, and bi-logarithmic sweep modes

Markers

路聽聽聽聽聽聽聽Tracking modes:

o聽聽聽聽聽聽聽聽Peak Min

o聽聽聽聽聽聽聽聽Peak Max

o聽聽聽聽聽聽聽聽Absolute Min

o聽聽聽聽聽聽聽聽Absolute Max

o聽聽聽聽聽聽聽聽Value Cross Any

o聽聽聽聽聽聽聽聽Value Cross Up

o聽聽聽聽聽聽聽聽Value Cross Down

Interface

路聽聽聽聽聽聽聽Full color 3鈥 TFT LCD 400 x 240

路聽聽聽聽聽聽聽4 dedicated buttons

路聽聽聽聽聽聽聽2 navigation keys

路聽聽聽聽聽聽聽MCX antenna socket

PC Interface

路聽聽聽聽聽聽聽USB Mini-B receptacle

路聽聽聽聽聽聽聽USB 2.0 Full Speed

路聽聽聽聽聽聽聽USB Composite Device:

o聽聽聽聽聽聽聽聽Mass Storage Class (internal disk)

o聽聽聽聽聽聽聽聽HID Class (Computer Control mode)

Storage

路聽聽聽聽聽聽聽2 MB internal disk FAT compatible

路聽聽聽聽聽聽聽USB Mass Storage

路聽聽聽聽聽聽聽Screenshot save and recall feature

路聽聽聽聽聽聽聽Measurement data save and recall feature

路聽聽聽聽聽聽聽Possibility of files with user definable frequency presets, scale settings, and three custom cable types

路聽聽聽聽聽聽聽Measurement data files compatible with SARK Plots and ZPLOTS programs

Calibration

路聽聽聽聽聽聽聽Automated Open/Short/Load calibration

路聽聽聽聽聽聽聽256 calibration points

路聽聽聽聽聽聽聽Calibration settings stored on disk

路聽聽聽聽聽聽聽Frequency calibration

Measurement Architecture

路聽聽聽聽聽聽聽Single conversion super heterodyne

路聽聽聽聽聽聽聽Two independent measurement channels for simultaneous voltage and current measurement for precise phase measurement

路聽聽聽聽聽聽聽Two synchronized 12-bit analog to digital converters

Processor

路聽聽聽聽聽聽聽72 MHz STM32 MCU

路聽聽聽聽聽聽聽256KB Flash

路聽聽聽聽聽聽聽48KB SRAM

RF Output

路聽聽聽聽聽聽聽Connector: MCX socket

路聽聽聽聽聽聽聽Output power:聽-10 dBm (0.1mW, 70.7mV rms) into a 50-ohm load

Power

路聽聽聽聽聽聽聽3.7V 1000mAh Internal Lithium-Polymer battery

路聽聽聽聽聽聽聽USB for operation and charging

路聽聽聽聽聽聽聽Automatic Power Off functionality (disabled, 5, 10, or 30minutes)

路聽聽聽聽聽聽聽Autonomy聽聽2.5 hours

路聽聽聽聽聽聽聽Charge time聽聽3.5 hours

Environment

路聽聽聽聽聽聽聽Operating temperature: 0潞C to 50潞C

Dimensions

98 * 60 * 14.5 (mm)

Weight

300g

Package Content

路聽聽聽聽聽聽聽SARK-110 x 1

路聽聽聽聽聽聽聽Battery聽x 1

路聽聽聽聽聽聽聽MCX to BNC adapter pigtail x 1

路聽聽聽聽聽聽聽Allen key x 1

4 thoughts on “Sark-110 Antenna Analyser

  1. Pingback: Strange link dipole shenanigans? - VK3BQ

  2. Can I use my MAC and its OS X to obtain and install new microcode into the Sark rather than a PC? Thanks

    • The sark looks like an external hard drive device on pc or Mac. You just download the new firmware and copy this file onto the device and then run the firmware upgrade from the dark. Yes. It works on a Mac. Thanks

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