signal

489 links - and 11 categories

160m Short Vertical Loft Antenna - This is a very small vertical 160m antenna that fits in the loft of even my small house. It was built as a way of getting a signal out on 160m for local AM contacts, but the local noise level was far too high to allow it to be used at night for this purpose. However, on WSPR it did a pretty good job with WSPR spots from a very long way across Europe being received when running 2.5W out.
[ Hits: 208 | Votes: 1 | Rating: 7 ]

VHF Bi-Square Beam Antenna - 2 Wavelength ,2 Meter Bi-Square Beam , 5dbd gain. This antennas are very cheeap to build and their radiation pattern is similar to a figure 8 with maximum signal through the loop but they may be used as a near-omnidirectional antenna
[ Hits: 188 | Votes: 2 | Rating: 9 ]

Coax Notch Traps - Attenuating adjacent bands - Targeted Attenuation for Adjacent Bands. Filtering is needed between the two rigs to prevent physical damage to the RX front end and to prevent the kinds of high-signal overload conditions like desense and IMD - as well as containing harmonic energy.
[ Hits: 134 | Votes: 0 | Rating: 0 ]

Kuhne Electronic - High quality microwaves components for professional and radioamateurs. Power Amplifiers, Low Noise Amplifiers, Es hail 2 Converter Transverter, Signal Sources, Passive Components and Accessoires
[ Hits: 106 | Votes: 0 | Rating: 0 ]

FreeDV - Digital Voice for HF bands - FreeDV uses an audio codec as a software based modem to decode and encode the voice and text data from your computer. The data is encoded and then is transmitted over the HF radio using AF signals that can then in turn be decoded by the receiving station.
[ Hits: 92 | Votes: 0 | Rating: 0 ]

Operating EME on two meters band - 144 Mhz EME Basics, Weak Signal VHF by Tim Marek that will help you make informed decisions as how best to be proceed in constructing a EME station of your own.
[ Hits: 95 | Votes: 1 | Rating: 9 ]

PSK: How to Assure a Clean Signal - Due to the nature of PSK it is imperative that you maintain a very clean signal. In this page you will find examples of a clean PSK signal and one with excessive splatter, and a short guide on how to properly adjust your transmitter to assure a clean trace
[ Hits: 137 | Votes: 0 | Rating: 0 ]

WSPR MAP by WSPRnet - Weak Signal Propagation Reporter Network Map and Database of WSPR data
[ Hits: 342 | Votes: 3 | Rating: 7 ]

WsprDaemon - WsprDaemon is a robust application for Linux systems that decodes Weak Signal Propagation Reporter (WSPR) signals, operates with networked KiwiSDRs, Includes baseband audio input option, provides a reliable reporting function to the wsprnet.org database
[ Hits: 110 | Votes: 0 | Rating: 0 ]

MorseExpert for Android ^updated - Morse Code Decoder for Android based on the algorithms implemented in CW Skimmer. Morse Expert decodes Morse Code audio to text. It is optimized for decoding weak, fading signals in the presence of interference, especially on the Amateur Radio bands. The input audio might come either from the built-in microphone or from another device, such as a radio receiver.
[ Hits: 329 | Votes: 6 | Rating: 7.67 ]

DXPSK - DXPSK and SMARTPSK are freeware Windows PSK31 software tools capable to send and recive even multiple tracks of PSK31 signals. SMARTPSK is the improved version of DXPSK capable to display up to 25 tracks.
[ Hits: 144 | Votes: 1 | Rating: 10 ]

AppCAD - Free windows application for RF Microwave and Wireless applications. AppCAD is useful for the design and analysis of many circuits, signals, and systems using products from discrete transistors and diodes to Silicon and GaAs integrated circuits. AppCad is a unique suite of RF design tools and computerized Application Notes to make your wireless design job faster and easier
[ Hits: 133 | Votes: 1 | Rating: 8 ]

SDRangel - SDRangel is an Open Source Qt5 / OpenGL 3.0+ SDR and signal analyzer frontend to various hardware TX & RX Software Defined Radio. SDRangel uses sample source plugins to collect I/Q samples from a hardware device.
[ Hits: 160 | Votes: 1 | Rating: 6 ]

Universal HF Tracker - The PCB can produce a High Frequency RF signal in the range of 1MHz to 12.5MHz using an AD9833 Direct Digital Sequence (DDS) frequency synthesizer. The signal can be modulated with different Weak Signal modes such as WSPR, JT9 and JT65 using our Arduino 5V/16MHz Pro Micro software.
[ Hits: 145 | Votes: 0 | Rating: 0 ]

20m 30m 40m Bandpass Filters - Homemade LC Bandpass Filters for 20M, 30M, 40M In multi-station environments like special events, field day, portable operating, is very important to protect receivers from excessively strong signals. Bandpass filters help to protect your transceivers.
[ Hits: 383 | Votes: 1 | Rating: 10 ]

A Simple Dual-band Transceiver - This a well performing, simple two band transceiver. The transceiver design is inspired by the S7C superhet. A dual-band transceiver with a crisp receiver and a clean SSB signal
[ Hits: 99 | Votes: 1 | Rating: 6 ]

40 Segment LED S-Meter - Provide your radio with a very string signal, then adjust the HIGH LEVEL pot to the threshold of illuminating the last LED (all LEDs on).
[ Hits: 94 | Votes: 0 | Rating: 0 ]

Preventing CW key clicks - Key clicks are generally undesired clicks or thumps generated by a CW transmitter as the key is put down or let up. How much does the rise time or bandwidth of a CW signal need to be limited to prevent other QSOs on adjacent frequencies from being annoyed by key clicks?
[ Hits: 93 | Votes: 0 | Rating: 0 ]

Signal to Noise Ratio SNR - Signal to Noise Ratio, definition and application to Radio Communications. Signal to Noise Ratio (SNR) is a figure of merit that compares the level of a desired signal to the level of background noise.
[ Hits: 133 | Votes: 5 | Rating: 8.4 ]

ADF4351 Signal Generator - Just a simple signal generator based on ADF4351 module from fleebay allows you to generate one single frequency that can go up or down in 100Khz steps via two push buttons.
[ Hits: 149 | Votes: 2 | Rating: 10 ]