- Producers of custom name tags, luggage tags, club badges, Employee Name Tags, Special Event Badges, but also Comtech Amateur Radio Television Transmitters and Receivers
D480 filters, Video cameras and accessories.
DX Spotter by YO8SAWnew
- DX Spotter is a DX Cluster client application which offers easy to use filters and alerts.
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DX Cluster for Android
- Get live DX spots on your Android device. DX Cluster for android is a real time DX spots client, show different bands and mode filters, a country filter for spotter or the spots, prefix or call sign alarms. Download from Wolphi Solutions
- ScopeIIR: an Infinite Impulse Response (IIR) digital filter design tool for Windows. It designs high-order IIR filters based on analog filter prototypes, and can design lowpass, highpass, bandpass, and bandstop filters.
CW Filter Kit
- Building the W3NQN CW Filter Kit Step by Step by AK3W
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A home-built low-pass filter for 4m
- This unit uses four capacitors, only two of which are variables, and a single tapped coil. It is built in a die-cast box, and has been tested up to 80W input power on 70MHz by G4CJZ