frequency interference

N3OX Flex Vertical for 40m - N3OX three meters Flex Vertical, a Short, Frequency Agile Vertical for 40 meters

Slim Jim antenna calculator - How to make a simple but effective Slim Jim antenna. It includes a calculator to work out all the mesurements for the frequency you require.

Cubical Quad Antenna Calculator - Easy Quad calculator, enter center frequency to get a quad antenna size

British Columbia Ham Radio Coordination Council - Frequency coordinations on BC Canada

UNYREPCO - Upper New York Repeater Council, Inc, support the frequency coordination needs of the Amateur Radio repeaters operating in its area

Florida Repeater Council - ARRL-recognized amateur frequency coordinating body for the State of Florida

KD5SDJ Indian Territory Amateur Radio Society - small but dedicated group of radio operators who primarily operate on a simplex on a frequency of 147.435

Resonant Frequency - Resonant Frequency: The amateur radio podcast was created to help get information on amateur radio out to the new ham and the ham that wants to find out about different aspects of the hobby they are thinking about trying out.

FORDAHL - The FORDAHL Group was founded in 1981 and quickly established itself as a leader in the area of high end miniature frequency control products.

K-Y Filter Company - Modem Telephone Super Filters For HF and AM Radio Interference.

PRO-COMM INC - High power, UHF, L-band, S-band, C-band, microwave frequency amplifier and oscillator devices, pulsed, CW, fixed-tuned, or tunable devices in the range of 600 MHz to 2000 MHz

Introduction to Digital Modes - Wireless Society of Southern Maine, Digital Modes Page, introduction to amateur radio digital modes, including FLDIGI, PSK31, RTTY, high speed CW, Slow Scan Television, HF Weather Fax, WeFAX, MFSK16, OLIVIA, G-TOR, AMTOR, MT63, Digital SSTV, Frequency Key Shifting, and more

High Frequency Active Auroral Research Program - A Scientific endeavor aimed at studying the properties and behavior of the ionosphere.

Elecraft K2 - Narrow Bandpass Filter - This note covers narrowing the K2\'s 40M bandpass filter to cover the narrower 40M band and reject strong out of band broadcast interference

Handling of extremely strong signals K2 Mod - Makes reception at frequency of strong tx close by possible

Frequency Measurement with the FT-920 - KC5M frequency measurement with yaesu ft-920

Home - Hunter Valley Scanning - Radio Frequency Scanning Newcastle and the Hunter Valley. Lots of Frequencies plus videos and photos and web links.

Hagerty Radio Company - Offer a Direct Digital VFO Kits (variable-frequency oscillator) using the Analog Devices AD9951 by WA1FFL

iRFC for iPhone - IRFC offers a full Radio Frequency Calculator on the go for network impedance adaptation with smith chart

iPad iPhone HF Weather Fax Decoder App - HF Weather Fax lets you receive marine weather radiofascimile transmissions on your iPad, iPhone and iPod Touch. Just connect it to a shortwave radio tune in a weather fax frequency, and watch the images come in.

70MHz Beacon - Description of the beacon hardware and DDS frequency source used for G4JNT personal beacon

12GHz frequency meter - A frequency counter device up to 12GHz by DL5NEG

The BBRC Frequency Counter - The Burnham Beaches Radio Club frequency counter is a PIC micro controller based frequency counter with LCD readout. It can be used stand alone or the in built offsets allow integration into a receiver

The BBRC Frequency Counter - PIC micro controller based frequency counter with LCD readout

Crystal tester - Crystal tester project, crystals are used to control the operating frequency of transmitters, and it is used in radio frequency converters, oscillators, filters for cw, ssb and many other applications.