low freq
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Antennas : 20M : 20 meter Dipole Antennas- 20 meter short loaded vertical antennas
- N4SPP
Loading is a way to lower the resonant frequency of an antenna radiator This technique ...[ Hits: 233 | Votes: 1 | Rating: 9 ]
- Choking balun for 160-30 meter band
- VK6YSF
Choking balun for lower HF and MF bands 1 8MHz 10MHz Requiring a choking balun ...[ Hits: 197 | Votes: 3 | Rating: 6 ]
- What is Horn Antenna
- frambos
Horn Antenna The energy of the beam when slowly transform into radiation the losses are ...[ Hits: 74 | Votes: 0 | Rating: 0 ]
- The W5JGV Loop Antenna
- W5JGV
A Shielded Low Frequency Loop Antenna allows Simultaneous Transmission and Reception at the Same Site ...[ Hits: 257 | Votes: 0 | Rating: 0 ]
- Balcony Mounted Buddistick Antenna by KP4MD
- KP4MD
The antenna handles 250 watts and covers 40 through 10 meters with an optional add ...[ Hits: 284 | Votes: 3 | Rating: 10 ]
- T2FD Antenna - Terminated and twisted folded dipole
- OH1AYR
T2FD is a 600 900 ohms folded dipole terminated with resistor Feed impedance is coupled ...[ Hits: 496 | Votes: 0 | Rating: 0 ]
- Long Wire Antenna for portable operations
- VK6YSF
updated
With the view to establish a quick and easy multi band antenna deployment for portable ...[ Hits: 807 | Votes: 14 | Rating: 8.36 ]
- XW4DX LAOS DXPedition
- XW4DX
XW4DX DXpedition to Laos 16 to 27 November 2023 We will be operating on all ...[ Hits: 12 | Votes: 0 | Rating: 0 ]
- HG7AN Antenna Analyzer
- HG7AN
Antenna Analyzer plus 500 is a multifunctional measuring instrument very useful for amateur radio activity ...[ Hits: 266 | Votes: 1 | Rating: 10 ]
- Recognition of CW signs at different listening levels and frequencies
- PubMed
The recognition of telegraphy masked by noise at 40 and 80 signs min telegraphy speed ...[ Hits: 81 | Votes: 1 | Rating: 7 ]
- HF communication prediction tools
- BOM
Online HF Communication prediction system provided by the Australian Governament Buerau of Metereology allow to ...[ Hits: 169 | Votes: 0 | Rating: 0 ]
- Yaesu FT-950 CAT Manual
- Yaesu
The CAT Computer Aided Transceiver System in the FT 950 transceiver provides control of frequency ...[ Hits: 60 | Votes: 0 | Rating: 0 ]
- FT991 MARS Mod
- FT991
This modification will expand the tx frequency range of the Yaesu FT 991 from allowing ...[ Hits: 935 | Votes: 5 | Rating: 3 ]
- ICOM IC-R75 Review by N9EWO
- N9EWO
Icom IC R75 tabletop HF communications receiver came onto the market back in 1999 and ...[ Hits: 44 | Votes: 0 | Rating: 0 ]
- WSQCall A Weak Signal QSO mode for LF/MF
- zl1bpu
Amateur Radio enthusiasts who are interested in the LF and MF bands may be familiar ...[ Hits: 187 | Votes: 0 | Rating: 0 ]
- A switched Capacitor Audio Filter
- AA8C
Here is a rather nice audio filter for use with Ham Radio gear It features ...[ Hits: 73 | Votes: 0 | Rating: 0 ]
- Bandpass Filter Calculator
- learningaboutelectronics
Passive Bandpass Filter online calculator and filter formulas Active Inverting Op Amp Bandpass Filters Active ...[ Hits: 171 | Votes: 3 | Rating: 5.33 ]
- A 2 meter band-pass cavity using surplus Heliax
- ka7oei
Cavity is often required at a busy site to not only prevent its receiver from ...[ Hits: 131 | Votes: 2 | Rating: 3 ]
- ADF4351 Signal Generator
- CT2GQV
Just a simple signal generator based on ADF4351 module from fleebay allows you to generate ...[ Hits: 149 | Votes: 2 | Rating: 10 ]
- 2m to 70cm Transverter Circuit
- VK4ADC
A 70cm 432 MHz Transverter Project transverter circuit is an electronic device that converts a ...[ Hits: 83 | Votes: 0 | Rating: 0 ]
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