low pass rf filter

Inexpensive GPS mobile Antenna - An inexpensive external GPS antenna, for 1.5 GHz band for GPS receiver, If you operate APRS or just need an external antenna for your GPS receiver, here’s one that is easy to build yet offers surprisingly good performance in a compact size. Best of all, it uses commonly available components and materials.

Radio Foxtrot Denmark Priority listing - RFD dx club based in denmark

Zlog for windows - zLog for Windows is a freeware full-featured contest logging software that runs on Windows. It supports major international and domestic (JA) contests and is customizable to many other contests not directly supported by zLog. Features include CW keying via parallel/serial/USB interfaces, highly sophisticated TCP/IP network that allows instant synchronization of a log of an M/M station, rig control, PacketCluster connenction. By JJ1MED/AD6AJ

Low Land DX-pedition Team - Contains stories, pictures, audio files of all previous expeditions and current ones.

Russian Oblasts and prefixes - Russian callsign prefix series: RAA-RZZ, UAA-UIZ, includs Amateur callsign system in Russia

DXCluster IOTA spots - Live IOTA spots by the dxsummit dx cluster

IW6MKI Uba I6YOT Mimma - A surf between radio history, home made and the sea.

Everything RF - everything RF is a web portal for RF & Microwave Engineers providing News, Design Articles, Information on new products and a component search engine which helps you find the RF & Microwave Components that are right for you.

Pravacy Speaker PMR446 - We are a leading developer and manufacturer PMR446 in Korea. Our new developed PMR446 model no. IFR-100 has new function like as private speaker it allow not to speak out from the radio and only you can hear the communication by using a private talk mode.

Aceco - Frequency counters, bug finder, RF testers, distributed by WiMo Antennen

Mutek - Transverters, amplifiers and low noise preamplifiers

Palstar - Receivers, Antenna Tuners and accessories, antenna analyzers, dummy loads, wattmeters, shortwave radio receivers, baluns, filters

Radio Direction Finding SM5SVM - SM5SVM ARDF resources

G8SLB SSTV Packet modems - SSTV and Packet Radio interfaces for PC and Amiga computers.

SSTV History - Slow Scan TV History from 1957 till today

WINRLC - Simple freeware tool to calculate several kinds of HF filters. Use to calculate L-C and R-C band filters and bandpasses, L-C, L-R and R-C highpasses and lowpasses, coils and capacitors.

DSPFilter - MM Hamsoft  ^pop - Freeware DSP filter by JE3HHT

SlowFeld - Win95 xperimental narrow band communication program that makes use of the Hellschreiber principle

Scan505 - It is a simple freeware scanner program for the Kachina DSP505. The software does NOT control the radio thru the interface port - it works in conjuction with the Kachina control software using the file interface

BuTel Software - Software Information PC Interfaces for the scanning radio hobbyist & professional radio control applications

7 MHz SSB Transceiver  ^pop - Circuit diagram and discription of 7 MHz Ham Radio SSB Transceiver. Transceiver using two MC1496, 4.43 MHz Ladder filter, LM386, LM324 and IRF840 in final.

Ham Radio Circuits  ^pop - Circuits of SSB Transceiver, AM DSB Transmitter, Antennas, BFO, VFO, 807, FM Mike, Crystal filter and more.

HSCW transmit interface box - Versatile transmit interface circuit

PTT and Sound Card Interface - PTT and soundcard interface schematic by ON6MU

Interface for MS_DSP - Minimal interface circuits for receiver and transmitter audio, also for PSK31