- Sennheiser Momentum 4 Headphones: water and a corroded connector
- Tool Grinding Machine Saacke UW II: many new copper nerves, and a new silicon brain
- Agilent 4352B VCO/PLL Signal Analyzer: see you again, after 5 years
- Tool Grinding Machine Saacke UW II: fitting new servos to the the old machine (A, X drivers)
- Tool Grinding Machine Saacke UW II: steppers to servo motors
- Heraeus K1150/3 Oven: some cosmetics, some bricks, some electronics
- Crystal Chandelier Restoration: an antique brought back to safe operation
- Tool Grinding Machine Saacke UW II: adding a high speed spindle
- JET BD-920N Lathe: MESA Anything IO 7I92TF Upgrade
- Tool Grinding Machine Saacke UW II NC: Fixing the Berger Lahr NI 3426 stepper control
- Tool Grinding Machine Saacke UW II NC: getting the axis drives turning
- Tool Grinding Machine Saacke UW II NC: a few basic repairs
- Tool Grinding Machine SAACKE UW II NC: “the small one” arrived
- A good “Springerle” recipe
- NE555 Watchdog Timer: the ESP32 needs some oversight
- A new Honigkuchen recipe
- Bauhaus VoltoLux LED Lamp: a early failure sickness finally subsided
- HP 4192A LF Impedance Analyzer: another visit to the workshop
- Metalworking: strange defects of long-used tools
- Meridian 506 CD Player: after 5 years, in need for more attention
- Another Micro-Tel 1295 Precision Attenuation Measurement Receiver: irresistible green
- Watkins-Johnson SE222-50 Backward Wave Oscillator: the magic helix
- Wood and Steel, covered in Paint: a new garden bench
- HP 11517A aka 08747-60022 Harmonic Mixer: a little study of a very intriguing device
- Spring repairs: Fixing and frost-proofing ball valve
- Fixing a really-high-frequency phase locked oscillator: a noisy opamp and a little bit of sticky tape
- Outdoor movie theater: a digital projector ceiling mount
- Laser cutter setup: air supply, off-gas and various cutting tests
- Hewlett Packard HP-85B: a marvelous desktop computer revived
- Baking 1&1: delicious cocos cookies
- Baking 1&1: hazelnut cake
- Baking 1&1: gooseberry cake with almond-based topping
- Cooking 1&1: Pickled cucumbers
- Baking 1&1: Chiffon cake
- Baking 1&1: black currant cake
- Most essential if you want to dig a well: gravel pump design
- Down from the well: all kinds of sand
- Drilling and digging: a new well
- LVDT converter: a Mahr P2004M, some electronics, and sub-micron resolution
- Etalon 77.19000 Height Gauge: a broken pinion
- Automated Basement Ventilation: keeping it dry
- Workshop Upgrade: Laser cutter and engraver SCULPFUN S9
- Workshop Upgrade: 3D Printer
- Cheap personal scales: turned into parcel scales with USB interface
- CNC Lathe Signal Conditioning: fighting the noise
- Electronic Master Clock: a huge train station clock is ticking again
- SMEG CS19ID-6 Range: another defect
- Siemens Master Clock: Revision 2
- A Japanese hot pot: A hot spring without a hot spring
- Olympia CD401 Tischrechner: a magnetic keyboard
- HP 3562A Signal Analyzer: a broken display and an easy fix
- HP 8569A Spectrum Analyzer: two mysterious resistors
- Heating energy consumption: first evaluations, and total annual energy demand
- Wavetek 172B Signal Generator: a heavy 00000000
- New Smart Home: at least, gas&electric meters are talking to the world wide web
- Christmas Time: Honigkuchen (honey based cookies)
- HP 4140B pA Meter/DC Voltage Source: some incorrect assumptions, but finally, a repair
- Induction range repair – just a couple of IGBTs, and a 20 Amp fuse
- A major move, and a defective CATV splitter
- SMEG CS19ID-6 Range: cold food only….
- Micro-Tel SG-811 Swept Signal Generator: another dead LH0021, and a design issue
- ADF41020 PLL: mysterious failures, and a not so mysterious fix
- Siemens Electric Master Clock: after some years, a little repair
- HP 4140B pA Meter / DC Voltage Source: Special low currents, special connectors, and various FETs
- Delicious Apple Muffins
- HP 54750 Digitizing Oscilloscope: a CARE package, and a scratched disc
- HP 54750A Digitizing Scope: it ain’t work with no power
- HP 3335A Synthesizer/Level Generator: Unlock issue, soldering issue?
- Force compensating precision balance: a few very interesting, very rare schematics
- HP 3335A Synthesizer/Level Generator: a good fake transistor? at least, a working unit!
- Banana Muffin: sooo delicious, and we don’t add any chocolate
- Mettler AE 163 Dual Range Analytical Balance: Swiss Made equipment, in Japan
- HP 3335A Synthesizer/Level Generator: a marvelous piece of engineering and precision
- Fake DAC8512, AD8512, Mixup, or both?
- GHZCTRL6: a new GHz-PLL control board, and a few learnings when prototyping with cheap (fake!) parts
- HP Attenuators: another great method to fix them
- HP 856x and 859x Series Spectrum Analyzer: Rubber keypad issues with 8561e 8562e 8563e 8593e 8593e 8596e, etc.
- HP 8566B Spectrum Analyzer: lock and roll issues
- HP 8566B Spectrum Analyzer: Defective and fake transistors, and finally, a HP 4-404 equivalent
- HP Attenuator 33321SB AKA 33321-60026 ATTENUATOR: fixing a defective spare part
- Motorola 2N5160 PNP RF Transistors: new-old-stock, medium old stock, fake stock?
- A low frequency xtal oscillator: Austrian generosity, gold, and crystals
- HP 8753C Network Analyzer: a new old YTO, and a new old firmware
- HP 3325B Synthesizer/Function Generator: a quick fix, and a hot transistor
- HP 33321SB aka 33321-60026 Attenuator: HP 8662A Synthesized Signal Generator fix
- HP 85662A Spectrum Analyzer Display: a quick fix of the 120 V power supply
- HP 6205C Dual DC Power Supply: a generous binding posts fix
- HP 8662A Synthesized Signal Generator: almost fixed!
- HP 8753C Network Analyzer: Serial numbers, options, EEPROMs
- HP 4192A LF Impedance Analyer: a few final fixes, and 14(!) EPROMs copied
- HP 8753C Network Analyzer: an Avantek fix
- HP 8753C Network Analyzer: spare YTOs
- HP 8753C Network Analyzer: all the dead YIG Oscillators
- HP 8662A Synthesized Signal Generator: An almost new generator, with a pretty old power supply, and a serial number mystery
- A precision current source: a mirror, and a TL431
- The big crash: Server failure
- u-blox GPSDO: a simple, low cost, yet – high performance approach
- GPSDO: a new 10 MHz distribution (and isolation!) amplifier
- u-blox GPSDO: Joe’s and Gisela’s magic generator
- TWS-N15 Noise Source 10 MHz-2 GHz: a few more sets
- HP 8561B Spectrum Analyzer: a smoking power supply
- HP 4274A Multi-Frequency LCR Meter
- HP 8753C Network Analyzer: a dead FOX and a dead YTO
- HP 4274A Multi-Frequency LCR Meter: some dubious ROM images
- HP 4192A LF Impedance Analyzer: some trouble in the signal chain
- Crimping Molex Contacts: 3.96 mm KK Style, new capability add to my workshop
- HP 4192A LF Impedance Meter: power supply, and power distribution fixes
- HP 4192A LF Impedance Meter: Isolated power supply fixed
- HP 4192A LF Impedance Analyzer: some issues fixed, more unveiled
- Micro-Tel SG-811 Swept Signal Generator: a hot (and golden) driver
- HP 4192A LF Impedance Analyzer: a leaking backup
- HP 8412A Phase Magnitude Display: really unusal supply voltages…
- HP 8642A Signal Generator: Further repairs
- HP 8642A Signal Generator: To be, or not to be a parts unit
- HP 6634A System Power Supply: A few almost-bad RIFA caps, and a 100 Volt, 1 Amp, source-sink supply, and a generous load of transistors
- HP 3326A Two-Channel Synthesizer: replaced, and replaced again!
- HP 4191A Impedance Analyzer: power supply fixed
- HP 8754A 4 MHz to 1300 MHz Network Analyzer: final repairs, and a function test
- HP/Agilent 6060A System DC Electronic Load: a quick repair
- Agilent 4352B VCO/PLL Signal Analyzer: working!
- HP 6038A System Power Supply: all fixed!
- HP 3326 Two-Channel Synthesizer: a bad lot of tantalum capacitors
- HP 8754A Network Analyzer: gold, sapphire and still low output
- HP 5086-7803 YIG tuned Filter and Switch: “SYTF” details and adjustment
- HP 8754A 4 MHz to 1300 MHz Network Analyzer: an analog computer, and a few rusted transistors
- HP 6038A System Power Supply: A 150 Watt Option (Option 100)
- HP 4276A LCR Meter: several issues, and several animals found
- HP 8561E Spectrum Analyzer: 100/300/600 MHz system fixed!
- Takeda TR6142 / Advantest R6142 Programmable DC Voltage/Current Generator: a busy CPU
- HP 8561E Spectrum Analyzer: 600 MHz troubles
- HP 8561E Spectrum Analyzer, 30 Hz to 6.5 GHz: some consequences of a past disaster
- HP 4191A Impedance Analyzer: 1-1000 MHz
- Anritsu MG3681A Digital Modulation Signal Generator: a digital box
- Si5351A + u-blox M7: Clock generator tests
- Si5351A “Any-Frequency CMOS Clock Generator and VCO”: Specifications, Myths, and Truth
- Agilent 4352B VCO/PLL Signal Analyzer: a great find (hopefully!)
- The 08662-60001 low noise VCO: the heart of the HP 8662A
- u-blox GPSDO: Update!
- u-blox GPS receiver: a self-regulating clock, and a GPSDO, and all of this, for the lowest cost
- Micro-Tel SG-811 Signal Generator: a second unit
- HP 3580A Spectrum Analyzer: Digital display fix, and ancient CMOS circuits
- HP 3580A Spectrum Analyzer: a few mechanical repairs, and sweep test
- HP 3580A Spectrum Analyzer: a non-working marvel of engineering
- US TEO Power Suppy: you want to get killed by a USB charger?
- Recipe: Pickled Garlic (and other mixed local vegetables)
- Recipe: German Küchle
- HP 8659B Spectrum Analyzer: mostly, the known issues
- Harvest Highlights 2018: Two-continent gardening
- Pizza and Baguette Oven: From China, to Japan
- Moving to Japan: Busy times…
- Meridian 506 CD Player: a hot driver
- Auna AV2-CD508 HiFi Amplifier: start-up power supply repair
- AB Arboga U2508: adding a “z-axis” digital indicator
- AB Arboga Maskiner U2508: a simple DRO (linear glass scale readout)
- Chuck tender/Bug Filet: Just let it soften in the oven
- Steamed dumplings: Dampfnudeln (original Swabian German type and recipe)
- EIP 545A Microwave Counter: Option 04, a dead eprom, and a noisy fan
- EIP 545A Microwave Counter: El Salvador’s brittle leg disease
- Oil Temperature Measurement Ni50: several meters of very thin wire
- Length Endcoder Interface: reading the Heidenhain
- HP 85685A: another mains filter failure – Schaffner FN 376
- HP 85685A Preselector Repair: faulty attenuation
- Chair Repair: build in 1991, refurbished in 2017
- Manuals Additions: Motorola!
- Rigol DS1052D=DS1102D Oscilloscope: encode issue fix
- Xmas Cookies: Heidesand
- A wireless door bell, activated by a wired door bell!
- Holzmann BS 128HDR: “Holz” means wood, but this is a metal band saw!
- Historic view of the workshop – Joh. Eisele Porzellan Grosshandel, Ludwigshafen
- Micrometer and Force: a time-stamped interface
- Jansjö Reading Light Conversion: running on 12 V, and never running out of light again, even in remote places!
- SME Tonearm Series V: a really THIN wire!
- Solar Upgrade: Another 140 (40?) Watts
- HP 8569A Spectrum Analyzer: A shaky fix
- Marantz Stereo Amplifier PM-14 MkII: explosive silicon
- HP 8640B Signal Generator: A new divider
- HP 8569A Spectrum Analyzer: Any organ (ehh, CRT) donors out there
- Workshop upgrade: Light fittings, and luminous efficacies
- New test lab and workshop: Renovation update
- Weber Q100: BBQ repair and Q-burner
- Solar Power to Electricity: Around-the-year analysis
- Standalone Photovoltaic System: lead acid energy storage cost
- Allotment 44 (Parzelle 44): Gardening, rather than soldering!
- Cast Aluminium Wok with Gas Burner: a 10.5 kW cooking arrangement
- Dual CV 1600 Stereo Amplifier: a real HiFi classic with some capacitor smoke, and a very large dropout voltage regulator
- Really Hot: Brick Oven Pizza at Home
- HP 6115A Precision Power Supply: repair complete!
- HP 6115A Precision Power Supply: not just one defect mixed with a lot of precision
- Micro-Tel MSR-902C Receiver: root cause analysis, and a volt meter
- Phillips Senseo Coffee Brewing System: the serious consequences of a broken wire
- HP 83572A RF Plug-in 26.5-40 GHz: only a fuse away from the highest frequencies
- Ultra-cheap LED Spot Lights: Failure mode analysis, and some reverse engineering, and some concerns
- Digital Delay Line: sawtooth corrections of an ultra-precise GPS-reference 1 pps signal, and thermal effects
- HP 8566B Spectrum Analyzer: A19 board, YTO unlock, bad precision trimmer(s)
- Avantek S081-0321 YIG oscillator: not oscillating at all
- EIP 545A Microwave Frequency Counter: another dead tantalum repair
- A precision pendulum clock, and an even more precise time interval counter
- Perfect time: upgrade to a Motorola M12+ receiver, and new GPS antenna
- A Thermal Fuse, and HP 10811-60111 Repair
- DCF77 vs. GPS time comparison: not a lot of uncertainty…
- Switchable microwave filter – inside a HP 83732B
- ADF41020 18 GHz PLL: universal divider and PLL board
- EIP 545A Microwave Counter: another power meter upgrade
- Major relocation, and numerous 230 V conversions…
- HP 3325B A26 Assembly: low byte SRAM, and an incorrect signature
- YIG Oscillator/YTO Analyzer: linearity, output power, hysteresis
- Micro-Tel MSR-902C Microwave Surveillance Receiver: A3B5 and A3B6 analysis and repair
- HP 8662A 8663A Power Supply A7A3 Assy: base transformer defect
- Micro-Tel MSR-902C Microwave Surveillance Receiver: power back on – first signs of (extraterrestrial?) life
- HP 3562A Dynamic Signal Analyzer: a blackened transistor, and a dead S-RAM
- Micro-Tel MSR-902C Microwave Surveillance Receiver: a metal box, microwave plumbing – 1 to 18 GHz tuner revealed
- TIC4 Logger5 Clock Monitor (“TIC4LOG5”): update and test data
- Micro-Tel MSR-902C Microwave Surveillance Receiver: a very intriguing, 60 pound briefcase
- 1″x30″ Belt Sander: re-wiring a capacitor motor from 115 VAC to 230 VAC
- HP 11683A Range Calibrator: no power meter calibration without it
- HP 11708A 30 dB Reference Attenuator: less than 0.0005 dB drift per year?
- TIC4 Time Interval Counter: 64 bit timestamps – 100 ns resolution
- Ordinary Wheat Bread: well-proven US recipe
- Some (good old German) baking recipes: strudel, marble cake, Gugelhupf
- HP 436A Power Meter: smoke and stench – X-rated cap failure
- HP 436A Power Meter: a strange analog ground issue
- HP 8663A Signal Generator: another power supply repair
- HP 8569B Spectrum Analyer: sweep issues on larger spans, A18 full multiband assy issue
- HP 8663A Signal Generator: switchmode power supply repair
- HP8568B Repair Story: 249, 275 unlock
- A13 30 MHz Reference Oscillator: a reasonably quiet oscillator, and a noise cable
- Dell Optiplex FX160 – 2 GB – Spinpoint M9T 2 TB: Ubuntu server economizer
- 440 MHz ISM Band Amplifier: a few extra milliwatts….
- HP 8569B Front Panel Assy Repair: rotary switches
- Vintage IC Stock: listing
- IBM Thinkcentre M50 P4 3 GHz: electrolytic capacitor repair
- EMI Sniffer/Checker
- Ultrasonic Pest Chaser: final design
- Xmas Bakery: ginger cookies
- Xmas Bakery: double-choc chocolate trees
- Special Ginger Honey Liquor: Elixir No. 4
- Vintage Transistors and IC Stock: listing
- ST LIS3MDL Triaxial Magnetic Sensor: a lot of data, for such a small VFLGA package
- Micro Networks Corporation MN3010 DAC: long term stability test of a rather unconventional DAC
- Micro-Tel Precision Attenuation Measurement Receiver: an all-electronic manual for an almost all solid state device
- Ultrasonic Pest Chaser: scare way all the rats, squirrels and other furry creatures….
- Compact Fluorescent Lamp (CFL) TP120-13MSL, 13 Watt: some circuit analysis
- HP 8569B Spectrum Analyzer: reference level adjust repair (broken contact)
- Kebaili CPG-500 Current Pulse Plating: reverse pulse plating power supply
- HP 8481A Power Sensor: why are they all blown?
- HP 8970A Noise Figure Meter: A7 voltmeter assy fix
- USB RTL SDR 28.8 MHz Reference: dividers, PLL, success
- HP 8970A Noise Figure Meter: defective A7 voltmeter assembly – temporary fix
- HP 8970A Noise Figure Meter: voltmeter assy (A7) defect
- TWS-N15 Noise Source: checking out some design alternatives
- TWS-N15 Noise Source: some RF transistors as noise generating devices
- TMS 2532 EPROM adapter: one byte every 50 ms…..
- TWS-N15 Noise Source: noise generating elements
- TWS-N15 General Purpose Noise Source: some progress on the design, and some tests
- HP 8565A Spectrum Analyzer: a ‘new’ CRT for a trusty unit
- Clothes dryer repair: AKO 742336 control unit type EDR0692XAX
- USB RTL SDR 28.8 MHz Reference: VCO design established
- HP (Agilent Keysight) 346B Noise Source: finally, a calibrated ENR standard, and a temperature compensated current source
- Latching Coax Relais Driver: useful for all kinds of HP/Agilent/Keysight attenuators and switches
- Tripple PLL Controller, for Micro-Tel SG-811/1295/1295: converting a ratsnest to a shiny box
- HP (Agilent Keysight) 8970A Noise Figure Meter: a makeshift noise source, and some test
- HP (Agilent Keysight) 8970A Noise Figure Meter: getting started, Error E26
- HP 3326A Two Channel Synthesizer: finalization of repairs
- HP 8569B (8565A) Spectrum Analyzer: curing the knob disease
- HP 3326A Two Channel Synthesizer: a engineering mystery, and a fuse mystery
- It’s tomato (and zucchini) time!
- HPAK (HP Agilent Keysight) 3326A Two Channel Synthesizer: power supply trouble
- HPAK (HP Agilent Keysight) 6205C Dual DC Power Supply: a mechanical fix
- HP 8566B (85662A) Spectrum Analyzer: fixing the 10 Hz issue, A4A7 3 MHz filter assy
- HP 8566B Spectrum Analyzer: YTO/YTX tuning, flatness adjustment, and an OCXO
- HP 8566B Spectrum Analyzer: 2 partial units and some spare parts
- HP 8568B Spectrum Analyzer: a fair number of adjustments…. done.
- HP 8568B Spectrum Analyzer: an amazing find, a few repairs, and a restored marvel of RF engineering
- 3047A Phase Noise Test Set: getting closer…
- HP 3047A Phase Noise Measurement: progress on the low frequency part, and a GTK interface.
- HP 8569B Spectrum Analyzer: almost the same, not quite identical
- H 8569B Spectrum Analyzer: some progress, and a few more items to fix
- HP 8569B Spectrum Analyzer: working essentials
- HP 8565A?? HP 8569B?? Spectrum Analyzer: a mixed box
- 3047A Phase Noise System: the revival
- Controlling the 35601A Spectrum Analyzer Interface
- 11729B Test Set: quick phase noise check of a Giga-Tronics 605
- BNC 50 Ohm Termination: a rather surprising construction
- 11729B Low Noise Down Converter: a small box, with very low noise
- 8662A Synthesized Signal Generator: another rather straightforward repair
- Wheat Corn Bread – an easy recipe
- 8645A Agile Signal Generator: finally, all fixed
- 5372A Frequency and Time Interval Analyzer: ROM images
- 5372A Frequency and Time Interval Analyzer: out of sensitivity cal. error – easy fix
- 8663A Synthesized Signal Generator: a 1 year long repair story
- Micro-Tel MSR-904A Microwave Receiver: AM detector/AGC circuit fix, A3B5 assy
- ADCMP580 Ultrafast Comparator: it’s really fast!!
- LinuxCNC EMC2 HAL Files: 3 axis mill, 2 axis lathe with encoders, jog wheel, axis compensation, camera view
- Rong Hua (Bianhuan) “50 Watt” Travel Adapter: not enough iron, for this “wattage”
- HPAK 8642B Synthesized Signal Generator: backlight replacement
- Homemade Hard Candy: sugar free extra-strong eucalypt-menthol
- Resistive Power Splitter: trying out a low-cost construction
- DCF77 Frequency Reference: a resonably accurate 10 MHz source
- Oscillator Driver/PLL: tuning fork oscillator
- Tesla/Voltcraft BK127C Power Supply: a trusty fellow
- Braided Bread: German “Hefezopf”
- Regulated High Voltage Power Supply: Switchmode control, 30 kV, about 1 mA
- Stepper and Multi-phase Motor Control: LMD18245 based driver
- FKM349VL Benchtop Mill: control, EMC2 LinuxCNC interface
- Anodizing 7075 Alloy: Micro-Tel handles
- German Bakery: sourdough bread, ‘quark’ variety
- Micro-Tel MSR-904A Microwave Receiver: a set of new handles
- Xmas Bakery: Nougat Plätzchen(=small cookies)
- Xmas Bakery: Christstollen
- Wiltron 6659A Programmable Sweep Generator: EPROM images captured, some rubber items
- USB RTL SDR 28.8 MHz Reference: VCXO
- HPAK 3455A Digital Voltmeter, 34401A Digital Multimeter: switch-on behavior
- HPAK 3455A Digital Voltmeter: some cleaning, and a really low drift reference
- Wiltron 6659A Programmable Sweep Generator: 10 MHz to 26.5 GHz, in a single sweep…
- Dell PowerEdge SC1425, 2x Seagate 3 TB NAS S3000VN000, Ubuntu 14.04.1 LTS: server upgrade
- 8645A Agile Signal Generator: power-up, lots of mechanical repair – finally, calibration, and some first tests
- Micro-Tel MSR-904A Microwave Receiver: a wire, another 2N2905A – repair completed (!) – sensitivity test passed
- HPAK 8645A Agile Signal Generator: pushing it back in shape, Chinese spares
- Micro-Tel MSR-904A Microwave Receiver: three bad guys, an a revised YIG filter
- Micro-Tel MSR-904A Microwave Receiver: manual found!
- AIOM: updated schematics, differential input bias, high-impedance input protection and amplifier
- HPAK 8569A Microwave Spectrum Analyzer: some adjustments, an ultrastable 10 Volt reference, GPIB test- repair completed!
- HPAK 8569A Microwave Spectrum Analyzer: tuning stabilizer/tickler repair
- HPAK 8569A Microwave Spectrum Analyzer: front panel repair/re-build
- HPAK 8569A Microwave Spectrum Analyzer: display fix, A6 assembly
- HPAK (HP Agilent Keysight) 8569A Microwave Spectrum Analyzer: a great find, 10 MHz to 22 GHz, and some spare parts at hand
- HPAK (HP Agilent Keysight) 8662A Synthesized Signal Generator: ref sum loop adjustment, output amp/peak detector repair
- AIOM – Analog Input Output Module: the low-voltage low-current SMU
- 8645A Agile Signal Generator: when disaster strikes
- Micro-Tel MSR-904A Microwave Receiver: reducing phase noise – phase detector frequency
- Micro-Tel MSR-904A Microwave Receiver: phase lock test, YIG driver bandwidth modification
- Micro-Tel MSR-904A Interface/PLL: low noise power supplies for PLL and pretune circuits
- Micro-Tel MSR-904A Remote Interface: pretune DAC, precision reference, and some auxilliary circuit
- Reference Signal Conditioning: 10 MHz amplifier/limiter, :2 divider, 5 MHz output
- Micro-Tel MSR-904A Microwave Receiver: remote control (digital interface)
- HP Fundamental/Harmonic Mixer 5086-7285 (22 GHz): digital bias control
- YTO YTF Driver: 0..250 mA, 16 bits resolution
- YIG tuned oscillator (YTO) / YIG tuned filter (YTF) driver: digitally controlled current source
- Micro-Tel MSR-904A Microwave Receiver: a broken trace, a replaced pot, and an escape proof guarantee
- Micro-Tel MSR-904A Microwave Receiver: crosshair, imagesetting film printing, remote control input
- Micro-Tel MSR-904A Microwave Receiver: some progress
- Micro-Tel MSR-904A Microwave Receiver: the monitor output
- Micro-Tel MSR-904A: RF tuner block diagram and component specs
- Micro-Tel MSR-904A: some basic repairs
- Micro-Tel MSR-904A Microwave Receiver: the big box arrived!
- 3562A Dynamic Signal Analyzer: LCD retrofit NewScope-5
- 3562A Dynamic Signal Analyzer: EROMS fixed, finally!
- Avantek AFT-4231-10F 2-4 GHz Amplifier: some characterization and modeling
- The 0 to 40 GHz SDR: Micro-Tel 1295+R820T USB RTL SDR
- A quick look at the HP 5086-7259 YIG Oscillator: 2.0-4.5 GHz, 15-18 dBm
- Figuring out the details of the Avantek S082-0959 YIG filter
- Micro-Tel 1295 Precision Attenuation Measurement Receiver: cleaned, painted (!), fixed, modified, and fully adjusted/calibrated
- HPAK 1345A Digital Display: a great worry, and a shorted tantalum cap
- EIP 545A Microwave Counter: power meter upgrade
- Micro-Tel 1295 Precision Attenuation Measurement Receiver: 2nd unit!!
- HP Agilent Keysight: missing instrument feed mystery
- HPAK (HP Agilent now Keysight) 8782B Vector Signal Generator: an easy fix
- The best solution, most likely: let the nonlinearities (INL) cancel out
- HPAK (HP Agilent now Keysight) 3562A: power supply repair
- ADS1211 evaluation: a bit of shielding goes a long way…
- Studying the local characteristics of the ADS1211: ADC differential nonlinearity, missing codes
- Harrison HP 6202B Power Supply – revisited
- Noise: external and internal
- Harrison HP 6202B Power Supply
- Ultralinear ADC – some mathematical review
- Probability density function – calibrating the ADC: test run with the ADS1211
- Low distortion sine generator: the source of very pure waves, digitally tunable
- High resolution ADC implementation: linearity, almost perfect
- HPAK 8763B switch test
- 3562A repair: 32 kbyte of bad EPROM data….
- 3562A Dynamic Signal Analyzer: reading the ROMs
- Attenuator calibration – first real dataset!
- Micro-Tel 1295 receiver: parallel to serial converter – digital readout
- PLL characterization – final results for the Micro-Tel SG-811 and Micro-Tel 1295 circuits
- PLL frequency response measurement: a ‘not so fancy’ approach, for every lab
- Fractional-N PLL for the Micro-Tel 1295 receiver: some progress, more bandwidth, two extra capacitors, and a cut trace for the SG-811
- R820T, RTL2832U SDR USB stick: some more findings about temperature sensitivity.
- R820T, RTL2832U SDR USB stick: gain accuracy tests
- R820T, RTL2832U: narrow-range linearity
- R820T, RTL2832U SDR USB stick: using it as a “poor man’s” spectrum analyzer – level linearity, level accuracy
- R820T, RTL2832U SDR USB stick – sensitivity, dynamic range
- R820T, RTL2832U: SDR USB stick hack – clean and stable reference!
- PLL measurements continued… ADF41020 locking the Micro-Tel 1295
- Fractional-N PLL for the Micro-Tel 1295: ADF4157/ADF5002
- Noise and spurs, ADF41020/Micro-Tel SG-811 PLL
- Micro-Tel SG-811/ADF41020 PLL: working out the details – loop filter, bandwidth, charge pump currents
- Micro-Tel SG-811 PLL – phase lock achieved!
- Solid state Tesla coil – aka “Plasma speaker”
- Sparks!
- Stage design
- The starting point
- Levitated!
- The current regulator
- The position regulator
- The position detector
- The coil, the circuits
- Magnetic Levitation – revisited!
- Terminations: 50 Ohm, +-1%
- DCF77 – Tell me, how far do these waves travel?
- Some little improvements…
- Leveler calibration PROM, now: EPROM
- Leveler – Missing part!
- HPAK 8904A – Power supply repair
- HPAK (HP Agilent Keysight) 8904A Multifunction Synthesizer
- Remotely controlling the Micro-Tel SG-811
- The Wavetek 907A – initial assessment
- The Microwave PLLs: stabilizing the YIGs
- Equipment selection: switching matrix
- Equipment selection: reflection bridge
- Equipment selection: signal generator and receiver
- What is an attenuator calibrator?
- Clear skies!
- The antenna, Quad-Helix
- NOAA basics – tracking satellites
- Let numbers speak….
- Modern times: ADS-B via SDR R820T, RTL2832U
- The old-fashioned approach: modified SAT tuner for ADS-B
- Antenna!
- ADS-B @Westfield
- Electronics
- Sharing thoughts, observations, learnings.
SimonsDialogs – A wild collection of random thoughts, observations and learnings. Presented by Simon.
