Tag Archive for Experiments

Three Interesting Mailbag Reviews & Giveaway! (November 2018)

In this episode Shahriar reviews three mailbag items. There is also a new giveaway! Follow the instruction at the beginning of the video to enter. The reviews are organized at follows:

00:09 – Introduction & Giveaway Details
02:21 – Leo Bodnar Electronic – Fast Pulse Generator

These fast pulse generators are rated to below 25ps! The modules are examined and various microwave and design considerations are explored. The block diagram and functionality of the final output driver is also described in details. The units are used to measure the rise and fall time of various oscilloscopes ranging from 300MHz to 13GHz of analog bandwidth. You can purchase your own fast pulse generator here.

21:11 – SV1AFN GPS Disciplined Oscillator

This GPS disciplined oscillator not only provides frequency synchronization to the GPS clock, it also provides programmable outputs on two independent channels using a Silicon Labs synthesizer IC. The complete module acts as standalone unit which only requires power and GPS antenna connection. The full schematic and block diagram of the synthesizer chipset is presented along with measured output waveform, frequency an phase noise at 1GHz. You can purchase your own GPS DO here.

33:28 – Sain Smart USB-C TS80 Portable Soldering Iron

This soldering iron which supports QC 3.0 is the followup of the very popular TS100 soldering iron. The unit can operate with up to 18W of power from 9V. However, it does not support PD on USB-C. By using the AVHzY USB tester the power bank can be configured to provide any desired output voltage and deliver up to 28W into the TS80 soldering iron. Using this method, the TS80 soldering iron can easily solder large components on a wide ground plane. The TS80 soldering iron can be purchased here or internationally from here. The Ankar PD+ 28600mAh power bank can be purchased from here and the AVHzY USB tester can be purchased here.

Here is the list of donations we have made to One Simple Wish:

A laptop for Macy who is about to start college – $260
New shoes for Emily who loves to walk around campus – $55
New Clothes for Myla who loves to play outside – $55
A new pair of school shoes for Lemon who loves all sports – $55
A new digital watch to remind Kevin to take his medicine – $74
A new coat for Thad to stay warm and look cool – $47
New clothes for Sharain who is looking for new employment after graduation – $55
New work clothes for Christine who is excited to start her new job – $55
A new Desk Lamp for Cristal so she can focus on homework – $55
Sensory tools for Wyatt who needs a bit of extra help – $111
Safe transportation for Shakeny who loves musica – $55
New clothes for Isaiah who is very clever – $55
Some new clothes for Katelyn who is making a change in her life. – $55
A new pair of sneakers for Sohelia the avid dog walker – $86

Teardown, Repair & Analysis of an Agilent N5230A 13.5GHz PNA-L Network Analyzer (Parts 1 & 2)

In this two-part episode Shahriar repairs an Agilent N5230A 13.5GHz PNA-L which suffers from un-leveled output in full frequency sweep range. The instrument is not able to produce any outputs above -25dBm above 10.5GHz and shows below specification output power levels below 10.5GHz.

Teardown of the unit reveals various microwave modules with the SSLAM final module responsible for amplitude leveling and frequency multiplication for frequencies above 10.5GHz. Teardown of this module shows a collection of MMIC dies wirebonded together using micro-strip ceramic pieces and interconnects. MMIC include switches, amplifiers, filters, multipliers, power detectors and attenuators. After examining the input/output signals of the module it becomes clear that the input switch IC is damaged. Unfortunately, an attempt to replace the die with a packaged QFN GaAs device fails. However, a lucky eBay find of a used SSLAM module saves the day and the instrument is restored to full functionality. Some measurements of an packaged evaluation board of a GaAs IC is demonstrated using the newly repaired PNA-L.

Part 1:

Part 2:

Quest for mm-Wave Capability: Teardown, Analysis & Experiments on Generation & Detection

In this episode Shahriar demonstrates the effort for collecting affordable components and instruments in the past year to be able to generate mm-wave frequencies in the lab. The main goal is to generate synthesized CW signals beyond 26.5GHz and to be able to analyze them on the Keysight MXA Spectrum Analyzer.

Several instruments and components are which include the HP 83752B Synthesized Sweeper, HP 83556A mm-Wave Source Modules between 26.5-40GHz and 40-60GHz using doubler and trippler architectures, HP 8349B 2.0-20GHz amplifier, HP 11970 series harmonic mixers and OML DPL313B diplexer. Combining all these instruments along with various waveguide to coax converters mm-wave generation and detection is successfully demonstrated.

Finally, a full teardown of the mm-wave source module is presented which includes the preamplifier as well the waveguide module with very interesting design architecture.

Teardown, Repair and Analysis of an Agilent 8449B 1.0 – 26.5GHz Microwave Preamplifier

In this episode Shahriar analyzes the failure of two Agilent 8449B Preamplifiers. These units should provide up to 30dBm of gain from 1.0GHz to 26.5GHz intended for use as a preamplifier. Both amplifiers test positive for power supply voltages and operation. After removing the interface cables from the amplifier module to the front panel, it becomes clear that mechanical shock has caused damage to the front panel connectors. Replacement cables and connectors are used to correct the problem.

Tutorial, Experiment & Teardown of a 24GHz Doppler Radar Module

In this episode Shahriar demonstrates a full analysis of a CDM324 24GHz Doppler radar module from IC Station. Opening the module reveals a series of microwave PCB components and several active devices. A complete analysis of the module is presented. The unit is then measured and the impact of antenna impedance and power supply voltage on the output frequency is measured. The phase noise of the output signal is also measured. Using a series of servo motors, the radiation pattern of the antenna array in both azimuth and elevation is also presented.

Using the radar module the speed of a computer fan is remotely measure using an oscilloscope and FFT function.

All proceedings from Patreon for this video will be donated.

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