air grid

Two-Wire Open Line - Article on various type of transmissium medium, like parallel lines, twisted pairs, shielded pairs, coax lines

Soft copper Tube Loops - Air conditioning soft copper tubes are perfect for loop construction. If you want to try a loop you must have an air variable capacitor or a vacuum variable capacitor. Article by PY1AHD

K7FFF 10M Beacon - K7FFF Beacon on the air at 28.287 MHz

N9YDZ Beacon - N9ydz beacon brighton, illinois, grid square em48 on 28.210 Mhz

PS8RF/Beacon 24 hours in air - PS8RF beacon tx in 7.035 Mhz with 3 W

LU3DKV Radio Club City Bell - Ham Radio Club from City Bell, in Buenos Aires province Argentina

Windsor Exports - Supplier and exporter of generator, diesel generator, petrol generator, industrial generator, silent generator, power generator, electricity generator, gas generator, air cooled generator, gensets 1kva, 2kva, 5kva, 10kva, 50kva, 100kva, 250kva

SEM soudage - Soldering a desoldering products, SMT repairs, accessories and consumables

QTH locator or Map square with Google Maps - Based on Google Maps displays corresponding QTH grid square or helps to find one by pointing on the map.

Solar Activity and 3-day Predictions - Prepared jointly by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center and the U.S. Air Force.

AA4DF's Consumer Electronics Repair - Look for free manuals (download) in amongst paid offerings for test equipment manuals. The freebies page also has mostly ham material. We do also sell major ham collections at pretty much close to our production and distribution costs.

2 kW HF Amplifier Rebuild - Heathkit SB-220 amplifier repaired at W8UM

Icom IC-756 PRO Repair - Repair of a 756pro that was powering up always on TX due to some damage in the ACC1 connector area

EB5AGV Kenwood TS-850S repair - TS-850S typical faults and solutions

Live VLF Natural Radio - A collection of VLF natural radio live streams. Where possible, streams are synchronised to provide stereo pairs with baselines of up to 4000 miles.

Bob's Electronics - Bob’s Electronics serve a wide market of customers throughout the Midwes, supports brand names such as Bendix King, ICOM, Relm, Uniden, Antenna Specialist, Antennex, Cushcraft, DB Products, Maxrad, Sinclair, and numerous others.

All-Spec - Products for electronic production service repair and testing

AMP Lady - Authorized factory sales and service center for Emtron. Repair service on all tube type amps HF Vhf Uhf from Palm Bay FL

Imagic Design - Used test equipment, reconditioned oscilloscopes, rental and repair service for test equipment

DXFile - Windows shareware logging program, offer several features like packet radio interface, web cluster, grid square, beaming directions, qsl manager lookup, dx spot filtering by F6GQK in french.

AirLink Express - AirLink Express is a user friendly digital mode software package for the Amateur Radio Operator. The software is compatible with Microsoft Windows XP and Microsoft Windows Vista. It offers PSK, MFSK and RTTY digital modes with logging and macro capabilities. If you have ever used the Digipan software you will be immediately familiar with Airlink Express. The user interface is almost identical by Alex Krist, KR1ST

FA Palm - Grid Square - Grid Square for Palm OS calculates the Maidenhead Grid Square for a given latitude and longitude.

KENWOOD TL-922 Modifications - Allow 9 bands and 1300 Watt output on the TL-922 amplifier with this document by PA0FRI

Power Gride Tubes - Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.

Coil Inductance Calculator - Calculate the inductance of a single-layer, air-core coil.