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- DCF-77 Synthesizer. With Arduino. Aka "TimeDuino"
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- Anything Supplymod (mostly using Arduino Nano Every)
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- PETH-6 Power Supply • ± 15 V, 100 mA
- PETH-6 Power Supply • +7.5 V, for Arduino / Genuino
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- VHF/UHF Power Amplifier with the BGD 804 - 860 MHz, 24 V
- VHF/UHF Power Amplifier with the BGY 588N - 550 MHz, 24 V
- VHF/UHF Power Amplifier with the QPA 3314 - 1794 MHz, 24 V
- VHF/UHF Power Amplifier with the QPA 3316 - 1794 MHz, 24 V
- VHF/UHF Power Amplifier with the TAT 8888 - 1000 MHz, 24 V
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- Remembering Robert A. Pease, aka "RAP"
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- ADF 4350 Module
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- A 100 MHz Reference Frequency Add-On, DIL-28 Formfactor
- A 100 MHz Reference Frequency with 10 MHz OCXO
- A universal VCO Board - MC100EL1648DG and PGA-103+
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- MEMS Oscillators - SiT8008/SiT8208/SiT8209
- The Mobile Emitter
- DDS Synthesizer - with AD9851, ≈70 MHz
- Low Noise DDS Daughterboard - with AD9859, ≈ 160 MHz
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- Circuit Collection : Oscillators
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- How to measure Mixer Characteristics
- A Mixer Tinkerboard for those ADE-xxx from MCL
- A Mixer Tinkerboard with the venerable NE/SA 612
- Universal Frequency Converter with the Si564
- A broadband Phase-Shifter for IQ Mixing Applications (ECL)
- An RF Phase-Shifter for IQ Mixing Applications (LVC)
- Transmod, shifts 6.8±1 GHz to 1.0±1 GHz.
- UpConverter for SDR, Callisto e.a.
- Noisy Things
- Noise • Introduction
- Calibrate your Noise Source. ENR calculator.
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- DIY Noise Source with 2 x GVA and 2 x PAT - ENR : 12.0 dB
- DIY Noise Source with 2 x GVA-81+ - ENR : 21.43 dB @ 1.0 GHz
- DIY Noise Source with 3 x GVA-81+ - ENR : 24.44 dB @ 1.0 GHz
- DIY Noise Source aka Ghettoblaster 555
- EMI Powerline Schnüffelstück
- How to Measure the Noise Floor of Your Spectrum Analyzer
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- Noise Figure Measurement using the Gain-Method
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- Quantumoptics Stuff 3599
- QO Basics - Photodiode Things ➜
- Photodiodes for Physicists
- Photodiodes for Engineers, Technicians, ...
- Photodiodes Troubleshooting : The Mobile Emitter
- Photodiode Opamp Amplifier • Transimpedance Amplifier
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- Magnetic Field Probe up to 3 GHz
- Prescaler :2 :4 :8 :10 :20 :40 :80 MC12093 MC12095 MC12080
- 6.5 GHz Prescaler :1 - :17 with the HMC705LP4
- 8 GHz Prescaler :80 - :640 with the HMC434 + MC12080
- Resistive Power Split, DC - 3000 MHz, 9.5 dB, 3 Way
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- Ground-Breaker
- Quantum Computer Arithmetic Unit : Adder
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- Directional Couplers
- Bi Directional Coupler or Dual Directional Coupler ???
- A Bi Directional Coupler, 1 - 800 MHz, 20 dB
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- A Dual Directional Coupler, 5 - 2850 MHz, 17 ±1 dB
- Understanding Directivity
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Statistics
Counts only, if "DNT = disabled".
216.73.217.6
216.73.217.6
Info
เราจะทำแบบวิศวกรผู้ยิ่งใหญ่
7. July 2026
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Sleeve-Antenna.php 4838 Bytes 21-04-2025 08:40:37
Sleeve Antenna Calculator
Low Weight • Omnidirectional
This is in fact a modified λ/4 groundplane.
The outer conductor is shaped in form of a cylindrical skirt. The cylindrical skirt behaves like a λ/4 choke and prevents the RF current leaking into the outer surface of the coaxial feeder line.
This type is suiteable for frequencies from 400 MHz to 2.45 GHz.
The outer conductor is shaped in form of a cylindrical skirt. The cylindrical skirt behaves like a λ/4 choke and prevents the RF current leaking into the outer surface of the coaxial feeder line.
This type is suiteable for frequencies from 400 MHz to 2.45 GHz.
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t1 = 7299 d
t2 = 238 ms |
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