I have used Dunestar 600 band pass filters for many years. I have made tens
of thousands of contacts using them running up to 150 watts and I have never
had a failure. The manual clearly states to correct your SWR and that using
your radio's automatic antenna tuner puts additional stress on the filters.
John KK9A / P40A
Subject: Re: [TowerTalk] ICE 419?
Date: Mon, 23 Jan 2012 08:49:59 -0600 (CST)
I've never had a failure of my 419's, but plenty with my old Dunestars.
One thing that can cause a lot of problems is running a tuner on your radio
into a bandpass filter...especially if you have a bad match into your amp
antenna. Tuners make the radio happy, but not the device it's "forcing"
into...it can create huge voltages that will cause the caps to fail...or
antenna components to fail...etc.
Also, if the filters are a little out of tune, the tuner will try to
compensate, creating even more stress on the filter...leading to accelerated
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