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Author Topic: Open Line Knife switch  (Read 1150 times)
AC4R
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Posts: 18




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« on: January 09, 2007, 09:40:44 AM »

For those who use open feed line and are looking for large knife switches to disconnect the ant and send it to ground , they are still out there. Do a google search under electric fence supples and you can find plenty. Use a double throw, one side connects the ant to your tuner, the other sends the ant to ground.
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W0FEN
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« Reply #1 on: November 21, 2013, 12:43:34 PM »

I have been looking for knife switches for a while.  I come from AM broadcast where antenna contactors like this are common.  http://www.kintronic.com/products/components/contactors/r-f-contactors/rfc-40-20-1-110-contactor.html

The problem is they are expensive.  I asked why they didn't make a less expensive model.  In thinking it over, it is clear that they sell less of the more expensive contactors. I did find this source:
http://www.filnor.com/tech/literature/knifeswitch/Knife-Switch-Catalog-Full.pdf

Still pricey...
I did come across DPDT knife switches that are used in emerging countries for their utility connections but are made in China.
http://www.aliexpress.com/item/Heavy-Duty-2Poles-Double-Throw-DPDT-30A-Safety-Knife-Blade-Disconnect-Switches/601956280.html
This i more like it!!!

With the orange cover off they are either a plastic or ceramic base with reasonable quality copper switch parts.  I have several on order.
Robin
w0fen
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