air core capacitors

Balun construction - problems with iron cores - Lots of information and measurements relating to HF baluns and transformers constructed using Iron Powder cores

Guanella 1:1 VHF choke balun - A model of a Guanella 1:1 VHF choke balun using a FT140-61 core

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 Beacon - FISTS Northwest K7FFF Beacon On the air at 28.287 MHz 2W to Dipole

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

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.

Electronix Express - Online shop for all electronics needs. Cables, Buzzers all kind of electronic components capacitors, inductors, relays, resistors crystals transformers, hardware like knobs screws nuts and washers, opto electronics, diodes and transistors, soldering desoldering products, test equipmemt and tools

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

LCLAYOUT drawing software - Simple inexpensive program that allows L-C filters designed by PCFILT or S/FILSYN which are to be built using air wound inductors and single layer capacitors cut from alumina or duroid substrate materials

Winding Toroids - A Guide to safely wind toroidal cores by vu2fd

LC Filter Design - This is an interactive design package for designing analogue (i.e. hardware) filters made of inductors and capacitors (Ls and Cs).

HP141 Clinic - Some observations on hp141 repair by Sam, WB8ZDF