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- Sathanimod - an FM Radiostation with the Si4713
- Supermod - A 23.5 - 6000 MHz Synthesizer with the MAX2871
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- DCF-77 Synthesizer. With Arduino. Aka "TimeDuino"
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- PETH-6 Power Supply • ± 15 V, 100 mA
- PETH-6 Power Supply • +7.5 V, for Arduino / Genuino
- PETH-20 Power Supply • ± 15 V, 600 mA
- PETH-30 Power Supply
- PETH-40 B3 Power Supply ±15V, 1200 mA
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- PETH-200V - High Voltage Power Supply
- PETH-581 Power Supply • Buck Conv. with Linear Afterburner
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- SOT-115 J-9 Power Modules ➜
- 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
- VHF/UHF Power Amplifier with the RFPD 3580 - 1218 MHz, 24 V
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- Maximum Output Voltage vs. Frequency
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- Bipolar Voltage to Unipolar Voltage ADC Driver
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- Non-Inverting Amplifier
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- Summing Amplifier
- Remembering Robert A. Pease, aka "RAP"
- Antenna Designer 📡
- Antenna Selection Guide
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- Discone Antenna Designer
- Dipoles ➜
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- Interdigital Bandpass Filter
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- PLL, VCO, DDS, Oscillators
- ADF 4350 Module
- A 100 MHz Reference Frequency Source, locked to 10 MHz
- 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+
- A universal XCO/PLL Board - NB3N501/502/511
- Injection Lock Oscillator with PLL (and a NB3N502)
- MEMS Oscillators - SiT8008/SiT8208/SiT8209
- The Mobile Emitter
- DDS Synthesizer - with AD9851, ≈70 MHz
- Low Noise DDS Daughterboard - with AD9859, ≈ 160 MHz
- RF Reference Source - for Powermeter Calibration
- 4046 VCO Calculator
- Mini Synthesizer with 74HCT9046A
- PLL Loopfilter Designer, 2nd and 3rd order
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- NE 555 Oscillator - Single Frequency
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- XCO3 - A low cost Crystal Oscillator Module
- Circuit Collection : Oscillators
- Mixer • Freq. Converters
- 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.
- Cascaded Noise Figure Calculations
- DIY Noise Source with the BFR92
- 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
- Magnetic Field Probe up to 3 GHz
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- Noise Figure Measurement using the Y-Method
- Quantumoptics Stuff 3599
- QO Basics - Photodiode Things ➜
- Photodiodes for Physicists
- Photodiodes for Engineers, Technicians, ...
- Photodiodes Troubleshooting : The Mobile Emitter
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- QO Toolbox - Radio Frequency Things ➜
- Bias - Tee
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- Highpass, 9-pole, L-C
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- Lowpass, Highpass using Würth Power Inductors
- 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
- Wheatstone Bridge Power Split, 1 - 1000 MHz, 6 dB, 2 Way
- RF Limiter
- RF Switch - with the JSW2-63DR
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- QO Toolbox - Audio Frequency Things ➜
- Booster (Amplifier) for Red Pitaya e.a.
- Ground-Breaker
- Quantum Computer Arithmetic Unit : Adder
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- Bi Directional Coupler or Dual Directional Coupler ???
- A Bi Directional Coupler, 1 - 800 MHz, 20 dB
- A Dual Directional Coupler, 5 - 1500 MHz, 10 / 20 dB
- A Dual Directional Coupler, 5 - 2850 MHz, 17 ±1 dB
- Understanding Directivity
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Statistics
Counts only, if "DNT = disabled".
216.73.216.244
216.73.216.244
Info
เราจะทำแบบวิศวกรผู้ยิ่งใหญ่
8. July 2026
further reading
The ARRL Antenna book has an interesting article about 'HF Discone Antennas' including some historical facts.
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calc_11.php 7470 Bytes 04-03-2025 19:11:59
Discone Antenna Calculator
Based on formulas given in the ARRL Handbook
Hint :
An interesting application note about WLAN discones (2.4 to 5 GHz) by Clemens Verstappen (DL3ETW) appeared in FUNKAMATEUR, 2/2013, p.156
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t1 = 7299 d
t2 = 260 ms |
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