Difference between revisions of "70cms filters"
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[http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitter. As used by G4KLB, G8VPG and others. | [http://www.minikits.com.au/electronic-kits/filter-kits/uhf-lowpass-filters/LPF7-450M Minikits in Australia] make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitter. As used by G4KLB, G8VPG and others. | ||
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===Simple inter-digital filter=== | ===Simple inter-digital filter=== | ||
Revision as of 16:20, 30 March 2017
There are plenty of designs available for 437 MHz filters:
450MHz Lowpass Filter
Minikits in Australia make a really good low pass filter which is ideal for use with the Portsdown or other 70cms DATV transmitter. As used by G4KLB, G8VPG and others.
Simple inter-digital filter
Design by F1DJO and F6GQM first published in CQ-TV 245
Tuneable pass band filter
Tuneable passband filter design by Ian, G3KKD, with 2 MHz band pass and 30 dB attenuation 4 MHz away. (the full article is available in CQ-TV 228).
Built units
The following suppliers sell built and tested units:
- Antennair - suppliers of the DTX1
- DG0VE - German supplier of reasonably priced filters for most amateur bands