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Band Swich

116sd019

Member
Feb 19, 2008
27
1
13
Built new 2X 2sc2879 linear amplifier but we have problem its work only 28 mhz. correctly how to make Band swich filter ? i want be work all band and wnat output swr low.
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This is not my area of expertise. However, I can tell you that you have two different problems: 1. how to broadband the amplifier so it will work between 1.6-30mhz and 2. How to add band switchable output filtering.

The second question is easier for me than the first. Basically, you need to make a series of band pass filters for each band that you switch between using the amp's bandwitch.

For the first question, I don't know how to answer that. I know I had the answer somewhere, but I can't find it.
 
Here you go:

Communications Concepts has pre-wound broad band transformers that you can purchase. They're cheap enough that it's worth just purchasing them to save you the time to figure it out yourself:

HF Transformers

They also have pre-built filter kits for each band...all you have to do is mount them and figure out a way to switch them inline:

Filters
 

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