Chiltern DX Club
- The aim of the club is to promote HF operating in Amateur Radio and to encourage excellence, particularly in DXing and contest operating. We approach this through mutual assistance, by the support of DXpeditions, by the issuing of achievement awards and by whatever other means are deemed to be appropriate.
- HF-SSB radio products Accessories, Amplifiers and Antennas tuners. Established in 1995 as a joint venture between Motorola's Land Mobile Product Sector and Bartal Electronic Enclosures Ltd.
- Freeware real time DSP filter particularly for applications of amateur radios , IIR, FIR filter, low-pass, high-pass, band-pass filter, band suppressor (notch filter) individually adjustable