mars mod v71a

W5GI Mystery Antenna  ^{updated  pop} - W5GI Mystery Antenna is a multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software. This antenna covers 80 to 6 meters with low feed point impedance and will work with most radios, with or without an antenna tuner. It is approximately 100 feet long, can handle the legal limit, and is easy and inexpensive to build. It�s similar to a G5RV but a much better performer especially on 20 meters.

Slinky and loaded beverages - How slinky loaded beverage antennas works, includes eznec models

Common Mode Choke Theory - A common mode choke may be used to reduce a type of electrical noise known as common mode noise. Electro-magnetic interference (E.M.I.) in the circuit's environment is one source of electrical noise.

Common mode chokes - Excellent article on limiting noise using chockes by Chuck Counselman, W1HIS

Quagi antenna for 144 Mhz - A modified W5UN Quagi design optimized for 144.050 Mhz

KD4MZM Beacon system - The kd4mzm ham radio beacon system running a Cobra 148 GTL 40 channel AM/SSB unit modified to the 10 meter band

Louisville Metro Police - Louisville Metro Police Department live scanner feeds, includes 8 live feeds and commonly used 10 codes.

Sound samples of digital transmissions - Sound samples of the transmission modes recorded at 11025 samples per second, mono and the message in all of the samples is the same: "the quick brown fox jumps over the lazy dog 1234567890".

SSB Electronic USA - manufactures and distributes HF, VHF, UHF and SHF equipment covering 10MHz. - 47.0GHz. Our products include: Wireless LAN / WAN Bidirectional Linear Amplifiers, Low Noise Preamplifiers - LNA's, RF Linear Amplifiers, Relays, Transverter Systems, Frequency Translation Systems, Downconverters, Antennas, Parabolic Dishes, Coaxial Cable, Relays, Antenna Switches, Microwave Test equipment, PC controlled Receivers, Microwave Linear Amplifiers including models for Telemetry, Wireless, and CDMA applications.

microHAM - Supply high quality accessories for your ham shack, including Band Decoders, various types of Antenna Switches, Antenna Stacking devices, special devices designed for the SO2R operator, USB Interfaces, Digital Mode Interfaces, Keyers and many others

6m technical docuemnts - A collection of scanned diagrams and designs, documents and modifications for 50 Mhz ham radio equipment

QSK for the TL-922 and SB-220 mods - Beautifully constructed amplifiers. Unfortunately, are not suited for high speed T-R switching, a necessary attribute for operating AMTOR, QSK-CW, or SSB-VOX modes.

FT-1000D: The G3TKF Synchro Mod - If you have an FT-1000 with the BPF-1 option, and are into HF weak signal DXing, this is for you. Although not for beginners, it should be no problem for hams with some home building experience.

Yaesu FT-2000 Mods and Manuals - Mods and manuals for the FT-2000

AF Filter for FT-897D - AF Filter modification for the Yaesu FT-897D by Petr OK1FIG

Radio Scanner Guide  ^updated - A guide to selecting Radio Scanners; divides both new and used radio scanners into 6 categories, based on their specifications and features - e.g. analog trunking scanners, digital trunking scanners, etc; provides specifications on each model

Antenna Model - Commercial software for the analysis of wire antennas. runs under most Microsoft 32-bit Windows operating systems—Windows 98/ME/NT4/2000/XP Analyze most wire antennas in free space, over perfect ground, or over real-world grounds with the conductivity and dielectric constant you specify. You describe the antenna to the program in easy-to-use spreadsheet-style input window

WASP-NET - Complex CAD and Optimization Software for Waveguide, Coax, Combline and Antenna components design and antenna modelling

EasyPal - Easypal is a freeware DSSTV software uses the DRM (Digital Radio Mondiale) encoding to allow the sending of image files over voice channels. This mode is known as Digital SSTV

gMFSK - Linux free multimode HF terminal program. Despite the name, gMFSK can send and receive many digital conversational modes typically used by radio amateurs on HF. Supported modes are: MFSK (MFSK16 and MFSK8) RTTY THROB (1, 2 and 4 throbs/sec) PSK31 (BPSK and QPSK) PSK63 MT63 Feldhell

EasyTuner - Easytuner id an excel spreadsheet that tunes your radio. Works with all Kenwood and Icom receivers and transceivers that are computer-controllable. Sets receiver and transmitter frequency and mode

SB220 SB221 arcing problems improvements mods - This article explores the claim an amplifier might arc from a parasitic oscillation, damaging capacitors, bandswitches, or other components.

Heathkit SB-200 Modification - Tuned input circuit modification by Tom Boza - NE7X

Henry 2KD-5 Grade UP Modification

RFI - Intermodulation - Getting squeaks and squawks from your H-T? Are pagers crunching your mobile rig's front end? Here's how intermod happens--and how to fight back!