Difference between revisions of "70cms filters"

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===450MHz Lowpass Filter===
 
===450MHz Lowpass Filter===
  
[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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[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 transmitters.   
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As used by G4KLB, G8VPG and others.
  
 
[[File:lpf7-450m-a-640x640.jpg|200px]]
 
[[File:lpf7-450m-a-640x640.jpg|200px]]

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 transmitters.

As used by G4KLB, G8VPG and others.

Lpf7-450m-a-640x640.jpg

Simple inter-digital filter

Design by F1DJO and F6GQM first published in CQ-TV 245

70cms 245 1.JPG


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).

70cms filter G3KKD.JPG

Built units

The following suppliers sell built and tested units:

  • DG0VE - German supplier of reasonably priced filters for most amateur bands