frequency

537 links - and 9 categories

Quad Antenna On-line Calculator - Cubical Quad Antenna On-line Calculator helps on defining the size of each element and spreader. Simply give the resonating frequency and it will calculate size of each element.
[ Hits: 294 | Votes: 1 | Rating: 5 ]

Baluns and common mode chokes - Voltage baluns versus Current baluns. When to use them, differences, and typical usage in feeding antennas, or in resolving radio frequency interferences.
[ Hits: 402 | Votes: 1 | Rating: 10 ]

Balcony Mounted Buddistick Antenna by KP4MD - The antenna handles 250 watts and covers 40 through 10 meters, with an optional add on coil for 80 and 60 meters. The author in this pages includes an interesting video in which describes the antenna setup, and the importance of the shunting coil on lower bands like 40 and 80 meters. SWR curves diagrams are also included and demonstrate the influence on resonating frequency of the shunting coil.
[ Hits: 281 | Votes: 3 | Rating: 10 ]

Tuning Antenna Traps - The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency. This article explains a method using a RF signal generator at +10dBm output into the coaxial trap.
[ Hits: 276 | Votes: 2 | Rating: 6.5 ]

HG7AN Antenna Analyzer - Antenna Analyzer plus 500 is a multifunctional measuring instrument, very useful for amateur radio activity. Its size allows you to easily take it for relocation as well. Frequency range: 100KHz - 500MHz. Access directly via WiFi. Includes a dual-channel signal generator
[ Hits: 266 | Votes: 1 | Rating: 10 ]

Microwave Filter Company - Microwave Filter Company is a leader in the design, development and manufacture of high quality passive electronic filter products in the 5 Hz to 50 GHz frequency spectrum.
[ Hits: 124 | Votes: 0 | Rating: 0 ]

HackRF - open source hardware for software-defined radio. HackRF One is an open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. 1 MHz to 6 GHz operating frequency
[ Hits: 177 | Votes: 3 | Rating: 7.67 ]

ZL2IFB Elecraft K2 K3 - A page dedicated to the Elecraft K2 and K3 transceivers, Connecting the K3 to your PC Useful K3 features, K3 REF CAL re-calibration of the VFO frequency, W2 wattmeter, KPA500 QSK amplifier
[ Hits: 104 | Votes: 2 | Rating: 10 ]

FT991 MARS Mod - This modification will expand the tx frequency range of the Yaesu FT-991 from allowing just ham radio bands, to all bands 1.8 - 30MHz and 50-54 MHz.This information is solely for use by licensed members of MARS (Military Affiliate Radio System) or CAP (Civil Air Patrol)
[ Hits: 930 | Votes: 5 | Rating: 3 ]

LAN-IQ SDR - Stand Alone Software Defined Radio, direct sampling receiver from 30 kHz to 1700.00MHz continuous frequency range, LAN interface for remote access
[ Hits: 258 | Votes: 1 | Rating: 8 ]

Royal Communications International, Inc. - Since 1988, Royal Communications International has been supplying communications equipment designed for the military, professional, and amateur market. We specialize in the sale and service of High Frequency, Single Sideband transceivers that are dependable and easy to use.
[ Hits: 140 | Votes: 0 | Rating: 0 ]

NanoVNA-H 900 MHz Upgrade - NanoVNA based on edy555, use the odd harmonic extension of si5351 to support the measurement frequency up to 900MHz. GitHub repository.
[ Hits: 191 | Votes: 0 | Rating: 0 ]

One-turn loop inductance Online Calculator - The high-frequency inductance of single-turn loops of various shapes made of round wire can be estimated accurately with a simplified formula
[ Hits: 122 | Votes: 1 | Rating: 10 ]

AF signal function generator for Windows - Windows signal function generator sotfware, offers 4 main channels, 4 modulators, 1 measurement generator, 1 frequency standard generator, Amplitude, phase and frequency modulation, can generates real band-limited signals
[ Hits: 619 | Votes: 4 | Rating: 3 ]

Frequency counter project - This project includes quite a number of useful testing features which were very useful when building other projects. Almost all the components used to construct this frequency counter were scrounged from old circuit boards and junk equipment.
[ Hits: 128 | Votes: 0 | Rating: 0 ]

Homebrew a High Performance SSB RTX for 14 MHz - This article describes the construction of a high performance transmitter and receiver for SSB (voice) communication covering the 14MHz (20 meters) high frequency amateur radio band with output range 15 to 20 watts and a top audio sound quality both on transmit and receive.
[ Hits: 347 | Votes: 5 | Rating: 7.8 ]

Experimental HF 6-band SSB transceiver - An SSB radio for the HF bands will be presented. Featuring 12 to 20 Watts of output power (depending on DC supply), full DDS frequency generation, covering 6 major frequency bands (1.8, 3.5, 7, 14, 21 and 28 MHz) within the short wave amateur radio spectrum. The rig also features colored LCD and front panel backlight.
[ Hits: 709 | Votes: 14 | Rating: 9.86 ]

80 meter Ceramic Resonator VXO CW Transmitter - Frequency agile 80 metre CW QRP transmitter. Ceramic resonators vary in the frequency shift obtainable. The one in the prototype of this article gave 3.525 to 3.558 MHz coverage.
[ Hits: 225 | Votes: 1 | Rating: 1 ]

rpitx Multimode TX for Raspberry Pi - rpitx is a general radio frequency transmitter for Raspberry Pi which doesn't require any other hardware unless filter to avoid intererence. It can handle frequencies from 5 KHz up to 1500 MHz.
[ Hits: 279 | Votes: 0 | Rating: 0 ]

Antuino - Antenna Test Equipment - Antuino is an accurate instrument that can be used in the field to measure SWR, field strength, modulation, etc. In the lab, it can be used to sweep filters, measure gain, distortion, frequency response, etc. It works upto 150 Mhz. On the third harmonic, it is usable on 435 Mhz band as well (with reduced sensitivity).
[ Hits: 306 | Votes: 0 | Rating: 0 ]