146 MHz filters

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Revision as of 18:34, 14 September 2017 by M0YDH (talk | contribs) (2m BPF from CAT17 illustrated)
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170MHz Low pass transmit Filter

Minikits in Australia make a really good low pass filter which is ideal for use with the Portsdown or other 146 Mhz DATV transmitters.

Lpf7-170m-a-225x225.jpg


Or there are a number of published designs which are easy to build using a minimum of tools:

Low pass 7 pole 144 MHz filter

YU7EF2m LPF 7 pole .jpg Response of YU7EF filter built by G7JTT


A simple DIY filter was originally published in the RSGB VHF manual and described in CQ-TV 250

The coils are wound on a 3/8" or 9.5mm drill. Example on the right is by M0YDH with help by G8GTZ.

146 filter.JPG 2m Band Pass filter built by David M0YDH to the instructions in CQTV250. Red wire form by Noel G8GTZ at CAT17 workshop gives the correct coupling performance!

144 MHz band pass filter by YU1LM

This is a nice easy filter to build and can be used on the output of the Portsdown transmitter before any power amplifier stages.

Yuilm.jpg

File:2m BP FILTER-YU1LM.pdf

There is also some discussion on the Funcube dongle website of the YU1LM filter http://www.funcubedongle.com/?p=456

Manufacturers of 144 - 148 MHz filters

  • OCI is a Canadian manufacturer [1]
  • QRP-Labs sell a 144MHz low pass filter kit for <10W duty at $4.65 [2]