Indian Hams

Dear Hams and S.W.L's

I am Sarath, vu3rsb from India. This is the virtual point for Hams and S.W.L's. Officially site launching soon. But use our E-Mail Service and tell your friends about this site and links. Absolutely free service for you and others. for comments and suggestions mail to [email protected]

General information

• AC6V's Amateur Radio and DX Reference Guide
• Counterintelligence and Counterterrorism WWW Page - information about surveillance and countersurveillance
• Doug Lung's R.F. Technology Page - Focusing on TV RF Broadcast Technology
• Electrical Engineering, RF & Microwave Engineering Sites
• Mobile commucation and cellular phone link
• Radio Components & Interference
• Radio Electronics - A General Introduction
• Radio signal propagation - in pdf format, from BreezeCOM
• RF Energy Safety - Reprint from QST and the ARRL Handbook
• Radiohistoriaa, Kyynel, Sever, sodanaikaisia sotilasradioita - radio history, text in Finnish
• Signals and Measurements for Wireless Communications Testing
• Suomen taajuuslista - radio frequency usage in Finland
• The quest for the ideal rf amplifier
• The Smith Chart - an RF engineering aid by Phillip Smith of RCA many years ago
• Why my radio bought from USA does not work well in Europe ?

Frequency allocation

• Allocation of Radio Spectrum in the United States
• Frequency Allocation Tables in USA
• Some shortwave stations which can be listened in Finland - text in Finnish

Amateur radio

• An amateur radio design tutorial
• ARRLWeb - the American Radio Relay League's home on the World Wide Web!
• AX.25 Amateur Packet-Radio Link-Layer Protocol
• Electronic projects and radio design links for the amateur radio and electronics hobby enthusiasts
• GW4OFQ's Home Page - amateur radio links
• Hamquest - an internet auction site created solely for the ham community
• Ham Radio FAQ
• Ham Radio Online - articles and projects
• HomeBrew amaterur radio receivers, transmitters and trancievers - compilation of links that describes radios built by amateur radio enthusiasts
• Ilpo J. Lepp�sen sivut DX-kuuntelijoille - pages for DX-listeners in Finnish
• Introduction to Packet Radio
• Linux HAM HOWTO
• Monitor Internet Amateur Radio Links
• Morse Code Practice Oscillator
• Packet Radio Linkpage
• Radio-TNC Wiring Diagrams
• Suomen Radioamat��riliitto ry - The Finnish Amateur Radio League - SRAL
• S��satelliittiharrastajan k�sikirja - weather satellite reception handlbook in Finnish
• TAPR - an international organization dedicated to amateur digital communications
• Track and Solve Electrical Interference
• VK2TIP Ian Purdie's radio design tutorial pages - for amateur, ham radio, electronic project enthusiasts as well as the electronic hobbyist
•  Yet Another 9k6 Modem - multi-standard modem for packet radio using FPGA chip

Antennas

• 50 ohms versus 75 ohms in antenna cable
• A J-Pole antenna for the Ramsey FM10a in GIF format - tuned for 89 MHz
• AM/FM/SW active antenna
• AM/FM/SW active antenna
• Build a Yaki-Uda Antenna
• HAM antenna documents and programs
• Jim's Notebook - all sorts of interesting and useful antenna data, techniques, hints and such
• Long Loopstick Antenna - to improve AM radio reception without using a long wire or ground
• Radiation impedances of wire and rod antennas
• RF BALUNs - one f the most important components in of transmitting system is the antenna feeder system
• Transmission Line Transformers - theory, articles and construction details for RF transmission line transformers

Back to Index

Broadcasting

• MrBroadcast.Com - broadcasting links
• Low Power Broadcasting FAQ
• Low Power Broadcasting FAQ
• Micro-Power Radio! - refers to very low-power, low-range, unlicensed radio broadcasting
• Radio Data System (RDS) Forum
• Pirate Radio Stuff - collection of material from the net
• The Free Radio Network
• The Official Pirate Radio Kit Bulletin Board
• The Pirate Radio Emporium - transmitter circuits, information
• VHF Pirate Radio Electronics Introduction - modulation, stereo, pre-emphais, compressors, limiters, transmitters and amplifiers described

Radio Data System (RDS)

• 68HC11 based RDS decoder
• La R�alisation D'un D�codeur RDS - RDS decoder circuit, text in French, but you can use automatic translation to English

Receivers

• Aircraft Receiver - A passive receiver for listening to the pilot, pdf file
• AM/FM/SW active antenna
• Crystal Radio - very simple circuit
• Doppler D/F Instruments - a doppler type VHF radio direction finder for HAMs and experimenters
• FM Band Preamplifier - This low noise amplifier will bring in those low-power stations
• FM Radio Spectrum Analyzer
• FM SCA--Subsidiary Communications Authorization or FM Subcarrier Information - An Educational Document
• One-transistor Regenerative AM Receiver - classic design revamped slightly
• Op Amp Radio - very simple AM radio
• Poor Man's Spectrum Analyzer - information about an electronics kit
• Spectrum analyser kid - simple spectrum analyzer for frequencies between 0 and 33 MHz
• Stereo Decoder - for FM receiver
• The R2 Single Sideband Direct Conversion Receiver, Revisited: The R2a

Transmitters

FM transmitters and related circuits

• Basic FM Transmitter
• Crystal HF Electronics - radio transmitters and related electronics
• FM Band Monaural Transmitter - Varactor diode gives high quality modulation, pdf file
• FM Broadcast VCO and Buffer - for 88-108 MHz
• FM Stereo Transmiter
• FM Transmitter - low powered FM transmitter, includer circuit board and parts placement picture
• Micro Power FM Broadcasting Circuits - accessories to transmitter circuits: audio limiter, audio mixer, antenna and essential modifications for Ramsey FM10
• Mighty's Pirate Radio - many radio circuits, including mono and stereo FM transmitters
• Simple FM Transmitter - versions for 30-40 MHz, 40-50 MHz and 90-100 MHz ranges
• Small Radio Transmitter - FM 85-108 MHz
• We-man's radio circuits - FM transmitters, fax interface and antenna design

FM wireless mics

• FM Room Bug - circuit diagram description and PCB layout
• High power FM mic
• Low-power FM Wireless Microphone - tuned to the 100 - 108 Mhz region, read also Detailed Description of the circuit
• Constructing an FM bug - article from Phrack Magazineissue 48
• Small Radio Transmitter - information about building a small radio transmitter which works with a microphone

Ramsey FM10 transmitter kit related circuits

Ramsey FM10 is a popular FM transmitter kit based on BA1404 IC. The kit is sold by Ramsey. The accessories designed for FM10 are useful for other radi projects also.
• Ramsey FM-10 FAQ
• Ramsey FM-10 Info - modifications, output amplifier, RF probe, filters, antenna
• Ramsey FM-10 Five Essential Modifications
• Ramsey FM-10A Transmitter Information

Telephone transmitters

• FM Telephone Bug
• FM Telephone Transmitter
• Phone-bug - A simple transmitter that is powered from the phoneline

Other radio transmitters

• 136kHz and 73kHz circuits
• 1.5 Volt Tracking Transmitter -fFrequency range is the usual 87-109Mhz on the FM dial
• Ensemble domestique HF 4 voies - 4 channel radio remote controller which controls 4 relays, text in French, try automatic transtation to English
• FM Oscillator - circuit for a VCO and buffer that operates across the entire FM broadcast band (88-108 MHz)
• Micropower AM band radio station - simple transmitter offers surprisingly good signal quality, pdf file
• Micro Power AM Broadcast Transmitter - 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration
• Powerless transmitter
• Radio circuits by Kazuhiro Sunamura - over 100 simple radio circuits
• Simple 2-meter transmitter
• The 500W Radio Power Amplifier - fpr 160, 80 and 40 meter bands
• UKW Sender - operates from one 1.5V battery, lacks some coil information


Back to Index

Other radio related circuits

• 1.3GHz SWR & POWER meter board
• Audio mixer for Ramsey FM10 transmitter: schematic and description
• Cellular Phone Helper - activates a variety of devices when your cellular phone is in use, pdf file
• Harry's Homebrew Homepage - very many radio related projects
• Laajakaistaiset vahvistimet - information on building broadband amplifiers in Finnish
• Micro Power FM Broadcasting Circuits - limiter, mixer, antenna, modifications to Ramsey FM10
• Radio and RF circuit at Wenzel Associates technical library
• Radio Modem Circuits
• RF Sniffer 500 kHz to 500 MHz

Regulations

• FCC Part 15 Regulations governing unlicensed broadcast transmitters

Radio frequency interference

• Computer EMI
• Dealing with Computer generated RFI/EMI
• FCC Interference Handbook
• RFIing YOUR COMPUTER: Dealing with Computer generated RFI/EMI
• Electromagnetic Interference in Hearing Aid T-Coil Applications
• EMI from RF-Driven Lamps
• General Information about EMI/RFI
• How to avoid radio interference to audio equipment and telephone - written in Finnish
• QST October 1992 Lab Notes on Telep