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Author Topic: 160m & als 500rc  (Read 522 times)
KB2MS
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Posts: 19




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« on: November 27, 2005, 04:20:41 AM »

Can't get the amp to operate on 160.  It keeps kicking in to overload.  I have tried about everything.  Any Help appreciated.  
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K0BG
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« Reply #1 on: November 27, 2005, 04:53:43 AM »

That's not enough data to accurately diagnose. However, my guess is the SWR is too high. I know you have checked this, but try a different SWR bridge. The reason I say this, most built in SWR bridges lack in quality and accuracy, and doubly so at the ends of their frequency coverage.

The ALS500's high SWR detect is rather sensitive on 160 which adds a little to the mix as well.

First thing I'd do is see what it does into a known good dummy load.

Alan, KØBG
www.k0bg.com
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K0BG
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« Reply #2 on: November 27, 2005, 04:54:46 AM »

One more thing. The drive requirement on 160 is about 40 watts. Anything more and the amp will trip.

Alan, KØBG
www.k0bg.com
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KB2MS
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« Reply #3 on: November 27, 2005, 01:40:02 PM »

Alan I will try to lower the power to about 40 watts  The swr into a dummy load is 1.2 to 1.  It works great on all other bands.  80-15, tnx for your help.  mark
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