Difference between revisions of "146 MHz filters"
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=== A simple DIY filter was originally published in the RSGB VHF manual and described in CQ-TV 250=== | === 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. | + | The coils are wound on a 3/8" or 9.5mm drill. |
| + | |||
[[File:146 filter.JPG|300px]] | [[File:146 filter.JPG|300px]] | ||
| − | [[File:20170914 CQTV250 2m BPF M0YDH.jpg|500px| | + | |
| + | Example of the design built by M0YDH with help from G8GTZ who formed the coupling capacitor between sections from the loop of red wire. | ||
| + | |||
| + | [[File:20170914 CQTV250 2m BPF M0YDH.jpg|500px| ]] | ||
===144 MHz band pass filter by YU1LM=== | ===144 MHz band pass filter by YU1LM=== | ||
Revision as of 20:02, 14 September 2017
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 of the design built by M0YDH with help from G8GTZ who formed the coupling capacitor between sections from the loop of red wire.
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]
