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114 links

Lightweight 144 MHz Yagi antenna - VK3YY ^updated
A Lightweight 2m Yagi for SOTA The boom is 20mm PVC electrical conduit and the ...

[ Hits: 180 | Votes: 1 | Rating: 4 ]

Making a good balun - OZ1CX
The normal way to make a good balun is to wind a core with a ...

[ Hits: 499 | Votes: 0 | Rating: 0 ]
DIY isolation transformers - K2AV
Article about isolation transformer construction to perform optimal impedance matching Winding the FCP isolation transformer ...

[ Hits: 317 | Votes: 0 | Rating: 0 ]
Choking balun for 160-30 meter band - VK6YSF
Choking balun for lower HF and MF bands 1 8MHz 10MHz Requiring a choking balun ...

[ Hits: 197 | Votes: 3 | Rating: 6 ]

How to build a Coax Balun 1:4 and 1:1 - PA0FRI
An air wound balun made with coaxial cable can not become saturated because no powder ...

[ Hits: 577 | Votes: 8 | Rating: 8.63 ]

An introduction to the air cored coil - R.Clarke
We use the term air core coil to describe an inductor that does not depend ...

[ Hits: 108 | Votes: 1 | Rating: 2 ]

EFHW autotransformer comparison - John Huggins
Two different ways to create autotransformer for end fed half wave wire antennas by using ...

[ Hits: 527 | Votes: 3 | Rating: 2 ]
QRP End-Fed for 40m 20m 10m - VK3YY
This antenna build was strongly inspired by the well known PAR end fed antenna The ...

[ Hits: 170 | Votes: 3 | Rating: 9.67 ]

Score Distributor - Ham Radio Contest Score Forwarder - WA7BNM
Distributing contest scores in real time to online scoreboards he score distributor automatically forwards any ...

[ Hits: 120 | Votes: 0 | Rating: 0 ]

The Great Ham Radio Desk Project - AB4BJ
A great amateur radio shack desk done with a second hand solid core door measuring ...

[ Hits: 433 | Votes: 2 | Rating: 8.5 ]
Ham radio shack desk project - K0PIR
A new ham radio shack desk made of a solid core oak door.

[ Hits: 284 | Votes: 1 | Rating: 2 ]

Gigatronix Coax Cables - Gigatronix
Manufacturers of Coaxial Connectors Push Pull Latching Connectors Coaxial Cable Multicore and Coaxial Cable Assemblies ...

[ Hits: 137 | Votes: 0 | Rating: 0 ]

Seiuchy On-line morse code trainer - hb9fxw
Seiuchy is a web based morse code trainer that can be used even offline once ...

[ Hits: 246 | Votes: 2 | Rating: 9.5 ]

Coremax Technology - Coremax
Professional Lithium ion battery packs factory in Shenzhen China with more than 11 years experience ...

[ Hits: 156 | Votes: 1 | Rating: 5 ]

Ferrite Shop - Ferrite-shop
Ferrite shop is an on line shop for ferrite toroids cable cores and cable clamps ...

[ Hits: 174 | Votes: 0 | Rating: 0 ]

mini Ring-Core-Calculator - Calculate windings on ferrite cores - DG0KW
The program can be used to calculate inductors coils and their number of turns on ...

[ Hits: 401 | Votes: 1 | Rating: 1 ]
FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - VK2WB
This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between ...

[ Hits: 285 | Votes: 1 | Rating: 2 ]

Ferrite and common-mode choke - DH1TW
Finding the the best ferrite material for a common mode choke How to create efficient ...

[ Hits: 185 | Votes: 1 | Rating: 10 ]

17 meter QRP Transmitter - KB9II
1 watt 17 meter cw transmitter that was originally done about 10 years ago as ...

[ Hits: 122 | Votes: 0 | Rating: 0 ]

AnyRig A Flexible Digital Mode Interface - KK5JY
This project uses an inexpensive Teensy microcontroller as the core of a flexible interface that ...

[ Hits: 145 | Votes: 0 | Rating: 0 ]