FB LABO　backnumber

• Can the HFJ-350M multi-band whip be used to build a V-dipole?
• DIY 50MHz pocket dipole antenna. Portability and Performance!
• Investigating the PRR (Personal Role Radio), a transceiver used by the British military.

Topics from Around the World　backnumber

• Bruce Lee in VR2BLEE
• Review of the Icom IC-705 HF/VHF/UHF Portable Transceiver by Mark M0IAX
• A small dual-band directional antenna for 2m and 70cm
• FT8 and its Decibels

My Project�@backnumber

• Using military handset with the IC-705

Japan Castles On The Air (JACOTA)　backnumber

• Castle 11. Amagasaki Castle....Covid steps in and disrupts operation
• Castle 10. Yamato Koriyama castle
• Castle 9. Sumoto castle
• Castle 8. Sasayama castle
• Castle 7. Itokazu castle A magloop antenna at an Okinawan castle
• Castle 6. Izushi castle ... Defeated by the Weather and Covid
• Castle 5. Ikeda castle
• Go Pouch for JACOTA Operations
• Compact/Light weight Tripod for JACOTA Operations
• Castle 4. Shoryuji castle
• Castle 3. Tanabe castle
• Planning and Preparation for a JACOTA Castle visit
• Castle 2. Fukuchiyama castle (Kyoto Japan)
• Castle 1.Sonobe castle

Ham of the Month backnumber

• Johnny VR2XMC

Report from Thailand backnumber

• A Visit to Tohoku in Japan
• JARL Ham Fair 2024
• N5J Jarvis Island DXpedition 2024
• HS72KING
• Vacharaesorn Vivacharawongse Elected as RAST Honorary Advisory Chairman, RAST Organized E2QRP for 2024 IARU QRP Day, etc.
• Recap from 5 years ago, Vivacharawongse Visited HSØAB, US FCC Amateur Radio License Examination
• RAST Celebrated its 60th Anniversary and Held 2023 AGM in Saraburi Province
• Krabi ARDF 2024 for HRH Princess Maha Chakri Sirindhorn Royal Cup
• E20AX/P IOTA DXpedition to Lipe Island (AS-126)
• December YOTA Month in Thailand
• CQ World Wide DX Contest from Thailand
• IARU R3 YOTA Camp Pattaya, Thailand
• Dxpeditions, US FCC Examination, CQ World Wide DX Contest 2023, etc.
• JA Hams visited E20AX Club Station
• JARL HAM FAIR 2023
• World Radiosport Team Championship WRTC 2022 (2023) Bologna, Italy, 4-11 July 2023
• Friedrichshafen Ham Radio Fair 2023
• Parks on the Air in Thailand
• RAST on The Beach 4
• Fred Laun K3ZO Silent Key (Part II) A great loss for amateur radio
• Fred Laun K3ZO Silent Key (Part I) A great loss for amateur radio
• HF Amateur Radio Seminars Hosted by RAST and NBTC BW/E25KAE, The First Thai HAM Operator in Taiwan
• CQ World-Wide DX Contest SSB & CW 2022 from Ban Ta Bong (The Center of the World)
• POTA Activations in Thailand by JJ1DQR,
  Advanced Class Examination for Thai Amateur Radio Licenses
• HS3NBR/p Maeo Island IOTA AS-145,
  16th – 19th September 2022
• JARL HAM FAIR 2022
• Inmemoriam to the former RAST President Mayuree Chotikul, HS1YL,
  US FCC Amateur Radio License Examination in Thailand, etc.
• 45th International Amateur Radio Exhibition in Germany“HAM RADIO FRIEDRICHSHAFEN 2022”
• E20AX/P Mini-IOTA DXpedition to Samet Island (AS-107)
• Easing of Travel Restrictions for Visitors Entering Thailand,
  Tribute to Franz Langner, DJ9ZB and Roger Western, G3SXW
• RAST held its General Annual Meeting, May you rest in peace JH1AJT and W7LR
• RAST Annual General Meeting, March 20, 2022
• The First Intermediate License Examination Since COVID-19 Outbreak
• E20AX/p IOTA DXpedition to Chang Island (AS-125)
• CQ World Wide DX Contest CW 2021 from Thailand
• CQ World Wide DX Contest SSB 2021 from Thailand
• The 18th IARU Region 3 Virtual Conference was a success
• Celebrating 400th anniversary of trade relationship between Denmark & Thailand, etc.
• E2HQ RAST Headquarter 2021, etc.
• RAST will host the IARU Region 3 Conference 2021 online in September, etc.
• RAST Talks, RAST CW Challenge Results
• RAST held AGM meeting and hosted New Year Party, NARIT Astro Fest 2021
• RAST CW Challenge
• KMUTNB and RAST welcome Minister of Higher Education, Science, Research and Innovation & other news.
• FCC Amateur Radio License Exam, RAST Donated a Tower to Huai Kha Khaeng Wildlife Sanctuary,Installation of 2EL Quad at E24OYI
• RAST & G. SIMON BALLOON FESTIVAL 2020 "E2ICOM"
• RAST HF-101, November RAST meeting
• NBTC and RAST presented the callsign HS10A to His Majesty the King
• RAST hosts August meeting at an open-air restaurant
  US FCC Amateur Radio License Examination at KMITL, Bangkok, Thailand
• E2HQ RAST-Headquarter, Spirit of the 2020 IARU HF World Championship
  Installation of E24EZ, The first DMR Repeater in Thailand
• Global COVID-19 “STAYHOME” Radio Communication Event was a great success
• E2STAYHOME, RAST COVID-19 Special Event
  E21EIC inducted into CQ Amateur Radio Hall of Fame
  COVID-19 RADIO COMMUNICATION EVENT
• The E21EIC Station Antenna System Improved for Competition
• RAST Annual General Meeting
  April RAST meeting cancelled, YOTA event is postponed
• RAST installs IGATEs to expand the APRS network in Thailand
• First US FCC Amateur Radio License Examination in 2020
• Thailand Amateur Radio Day 2019

Report from USA　backnumber

• RCA Youth Activities: QSO Today Ham Expo
• QSO Today Virtual Ham Expo - Eyewitness Report
• VHF Simplex Operation and Spectrum Scope Use
• VHF Rover Contesting — Truly Moving QSOs
• YOTA Month a Success in the Americas
• Satellite Operations — Amazing Technology, Grids & Grins

Technical Trivia by Dr. FB　backnumber

• Generating “Sawtooth Waves” using a D/A conversion circuit and a counter IC
• Examining a D/A converter using a Resistor Ladder
• Electronic firefly and its circuit description
• Controlling the rotation speed of a DC motor
• Description of up-down counter using 74HC192 and 74HC4511 ICs
• Considerations when making a dual voltage power supply for operational amplifiers
• Observing filter characteristics with a white noise generator
• Is noise actually reduced in twisted pair cables?
• Experiments on divider circuits using a 74HC74
• Consideration of using a photocoupler as a voltage-variable resistor
• Distorted waveform spectrum as observed on a tinySA
• Trial making of a QFH antenna
• About the inductance of coils
• Operation of analog switches
• Small digital voltmeter, 2-wire type / 3-wire type. What is the difference?
• Constant current circuit using an Op-Amp
• Coaxial cable loss to UHF and SHF
• 2.4 GHz Wireless LAN Antenna
• Let’s use MOSFETS
• 25th Comparator
• The principle of PLL
• Examination of the MLA performance
• About the Fresnel zone of the SHF band
• Level difference under open and load ends of an SSG
• Is “Made in Japan” alive? (UHF adapter again)
• Possibility experiment of passive repeater with the Back-to-Back antenna
• Why you should make SWR measurements just below the antenna!
• How reliable is the L-type BNC?
• Is the Bird 43 accurate enough?
• Does a wire dipole antenna need a balun?
• Why we don’t use a silicon diode in a crystal radio?
• How to light the 7-segment LED
• Measurement of Antenna Performance on Handheld Transceivers (Part 3)
• Measurement of Antenna SWR on Handheld transceivers (Part 2)
• Measurement of Antenna SWR on Handheld transceivers(Part 1)
• An SWR meter
• V/UHF 3-Band Antenna Dismantling Note

Special Article　backnumber

• Taiwan Miaoli County
• I went to Akihabara in Taiwan (Part 2)
• I went to Akihabara in Taiwan (Part 1)
• A YL ham’s Cambodian diary

Exploring Ham Radio World with Masaco　backnumber

• Miyazaki Lab, Department of Aerospace Engineering, College of Science and Technology, Nihon University
• COMET Corporation (Part 2)
• COMET Corporation (Part 1)
• DAI-ICHI DENPA KOGYO (Part 2)
• DAI-ICHI DENPA KOGYO (Part 1)

Masaco's Social Studies　backnumber

• Episode 4: A taste of Harmony, Kawachi Wine
• Episode 3: Kameido Sohonten
• Episode 2: Sharp Museum
• Episode 1: Bicycle Museum

Short Break　backnumber

• How many colors do you see when a colored disc is rotated at high speed?
• Making a dual Positive/Negative voltage power supply in a single box, for experiments
• Building of an RF Volt-Ammeter for QRP operation
• White noise generator project
• One day electronics project – Making a simple antenna tuner for QRP operations
• Can the RHM12 portable antenna be matched with a bicycle body on HF?
• Making an “ON AIR” lamp using LM358
• Making a simple anemometer
• Making a sound machine say “Good morning. Thank you for everything.”
• Electronics project for the 10 MHz reference signal generator (2)
• Electronics project for the 10 MHz reference signal generator (1)
• Making a straight type AM radio using a TA7642 IC
• About splitters
• Electronics project for FB NEWS: Making a decoration light string
• Making a Simple Electric Field Strength Meter
• Building a simple QRP power meter
• Building a 20 Amp electronic DC load device using an N-channel MOSFET for the load
• Building an automatic backup power switching unit
• Overvoltage protection device using LM358: Part 2
• Building an Over Voltage Protector: Part 1
• Making a 50 MHz monoband MLA without a variable capacitor
• Making a 50 MHz monoband MLA.
• Let's connect a computer headset to the IC-705
• Building a microphone selector
• Building an audio amplifier using an LM386 IC chip
• An External Keypad for Icom Transceivers
• After all, is the receiver good for Up-conversion?
• Find the gain of the stack antenna
• The mystery of controlling the microphone and PTT with only two wires
• RFID tag

Technical Segment　backnumber

• My first impression of the Icom AH-730
• PoE technology seen in the IC-SAT100M (vehicle-mounted type)
• How to operate the IC-705 with a desktop microphone
• Using IC-705 for satellite QSO from a ferry
• Find the gain of the stack antenna
• Antenna Technology Inc. releases WA72128 HF multiband dipole antenna
• IC-705 cooling experiment
• How long does the IC-705 battery last?
• Using the Icom AH-4 with the IC-705

It’s Fun to Build Electronics Circuits!　backnumber

• Speech Compressor