146 MHz filters
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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.
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
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.
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.
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]
