blocking emf signals

2 Meter Vertical Mobile Antenna - Mobile vertical antenna for 144 MHz suitable for satellite signals reception by K5OE

G7IZU RRD WEBLOG - Information related to the G7IZU Radio Reflection Detection page. The detection of meteors, aurora and other phenomena through the use of signals reflected from ionization in the upper atmosphere.

Digital Modes Samples - Audio recording of many ham radio digital modes emissions. Sound samples of HF VHF digital signals samples and published by KB9UKD

Starman Electric - Starman Electric manufactures DataBridge wireless RF modem modules for easy point-to-point wireless data transmission of analog, digital, and serial RS232 UART signals.

Analyzing UHF signals using FFT programs - With spectrum analysis of beacon signals, it's possible to see features relating to various propagation phenomonen.

ulfelf : Ulf Elf Group - Ulf Elf Group. Exploration of ULF, ELF, VLF Radio with emphasis on natural radio signals, the Schumann resonances, earthquake precursors, etc.

CW Procedure Signals - Abbreviations used in CW operation

PSK31 Elmer page and PSK Signal Quality - Generating clean PSK signals and helping others to correctly tune their souncard output, as well as giving proper RSQ reports by identifying signal quality by N1NKM.

Long delayed echoes in EME - The following discussion about the long delayed echoes (LDE's) on the EME signals

Magnetospheric ducting as LDE cause - LA3ZA on magnetospheric ducting as an explanation for delayed signals on 3.5 MHz

Propagation and the Atmosphere - overview of radio signals and radiowave propagation and how different areas of the atmosphere affect radio communications.

Tropospheric propagation - Article about tropospheric propagation and the way in which radio signals at VHF and above propagate over greater distances than strictly line of sight in the troposphere

Elecraft K2 Improving CW Filter - Here is a cheap and simple way to significantly improve the K2 CW filter(s). With this mod, even strong signals will fade to black as they tune out of the filter pass band

Raspy signals on the TS-870 - Troubleshooting the raspy signals on the TS-870S

Dynamic range measurements - Comparison of FT-1000D FT-736R FT-817 FT-847 FT-897 IC-765 Orion TS-2000 Spectral purity of a continous carrier, of a SSB and CW signals

Signals - Trio Datacom, Dolectek and Yaesu Vertex Standard cb and ham radio dealer in new zealand

Signals - A quick and simple reference to various communications signals, such 10/11 Codes, Morse Code, Phonetic Alphabet, Police Color/Penal Codes, Q-Signals.

WSCGen - Signal generator using the PC soundcard to output continuous tone, CW, SSTV, AO-40 telemetry, and PSK31 test signals with variable AWGN. The program will also output to a RIFF .wav file by AE4JY

APT Decoder - APTDecoder is a free software for recording and decoding signals transmitted by NOAA POES APT enabled weather satellites. It is run on a NT-based version of Window

Retrofit of a GLA-1000 to GI-7B - This retrofit of a GLA-1000 to GI-7B was done by Lawson, W4EMF, in 2002. Modifying The Dentron GLA-1000B for the GI-7B Triode

Dentron MLA-2500 Retrofit to the GI-7B - How retrofit the MLA-2500 with the Russian GI-7B tube to replace the 8875's which are both expensive and hard to come by tubes by W4EMF

Using Band-Pass Filters - Clean Up Your Signals with Band-Pass Filters

What cause key clicks - Clicks are most problematic when we try to copy weak signals next to moderately strong signals. How to recognize them, and how to identify clicks problems

USB Warbler - This project describes how one USB port can provide all of the signals necessary to operate a transceiver in digital mode from a Windows XP laptop by KG4JJH

UHF on a VHF Rig - This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.