I'm assuming these commercial services are around 460 MHz - what about a stub filter? a high quality open stub tuned to whatever transmissions are ailing you may do the trick.

PAR electronics is also famous for excellent filtering products.

Andrew Rich wrote:

I think I went a little overboard.

I replaced my coax with heliax and fitted a pre-amp to the base of my antenna.

Now all I get is break through from commercial services.

Oh well.

I went from RG213 to LDF4-50. And I can now access a repeater 150 km's away I could not before.

Have to bay antennas and back of the pre-amp I think.

Cheers

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Andrew Rich VK4TEC vk4tec@people.net.au http://www.tech-software.net

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