diamond dp ch4

The Cycloid Collinear, a CP Omni - This paper describes a wide band, high gain, multi-element cp omni with a single 50 ohm feedpoint with instructions for building a 2 and half element cycloid collinear for 2 meters.

Coil loaded dipole for 80 meters - Coil loading of an 80m Dipole for restricted space. Here's a method that may allow you to fit that 80m dipole into your suburban backyard by VK3JEG

Home Brew Loading Coil for AD5X Vertical - How to make a loading coil for the AD5X portable vertical antenna

Groundplane Antennas at Various Heights - Mounting on Roof or at Ground Level?

Quarter Wave Wire GP antenna - A 1/4 Wave GP antenna for 146-225-445 Mhz

W3DZZ antenna project - HA2NON W3DZZ antenna project with pictures and construction details

K5ZD contest audio live - During some of the serious contest operations from K5ZD, we will enable live audio streaming direct from the headphones

LT1F BadPower - Bad power -LT1F site of the circulo de radioaficionados rosario Argentina

K4DPC 10 Meter Beacon List - K4dpc 10 meter beacon list

F4FDP - Jean-Luc - This is F4FDP's blog on Vox.

K9ZW Blog - With Varying Frequency - Amateur Radio Ponderings

Sandpiper Aerial Technology LTD - Sandpiper has been designing and manufacturing aerials for over 25 years. Offer HF Dipoles and verticals, VHF UHF Yagi, collinears and other beam antennas, elical antennas,quagi,moxon, and portable antennas, tripods mounts and fiberglass poles

Accute Micro - China supplier of ceramic bandpass filters in standard resonator sizes of 2~6mm , 8mm , 10mm and 12mm with freqency from 400Mhz~4Ghz and sections 2~10

Fieldpiece Instruments - Heavy duty digital multimeters

Yaesu VX-2R Manual - Operating Manual for Yaesu VX-2R pdf file size is 1417 KB

PickMyRig - Need to find you next Rig, can't decide which?? PickMyRig is here to help.

Yaesu VX-3: bummer - PD0AC blogs post about the Yaesu VX-3 handheld transceiver

Memphis Amateur Electronics - Carry hundreds of ham radio products including amateur radios from Alinco, Icom, Kenwood, and Yaesu, plus ham radio products from MFJ, LDG, Diamond Antennas, Hustler, Ameritron, Astron power supplies, and books of all kinds

D-PRS Interface - D-PRS Interface is written to provide a universal interface between APRS clients and an Icom D-STAR enabled radio with a low speed port.

FilterCAD - A free computer aided design program to help users without special expertise in filter design to create filters using Linear Technology's monolithic filter ICs. With FilterCAD, you can design lowpass, highpass, bandpass and notch filters

DroidPSK  ^updated - DroidPSK is an application to decode and encode Ham Radio BPSK31 with the build in microphone/speaker or wired to your radio.

SimplePTT - You can use this simple application for triggering PTT on your radio via DTR/RTS COM port pins.

JQAM (QAM modem) - Transmit audio/video, UDP packets, http, rs232, with QAM using the soundcard rates up to 100kb/s.

Interdigital bandpass filter designer - Fill out the form to design a bandpass filter as described in the January 1985 issue of Ham Radio Magazine. These filters are generally limited to frequencies above 200 MHZ because their size is slightly longer than 1/4 wavelength

A single board no tuning 23 cm transverter - This transverter uses bandpass filtering with printed hair-pin filters. By KK7B