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Re: [TowerTalk] Control of ICE 419A Bandpass Filter

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Control of ICE 419A Bandpass Filter
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 20 Jun 2013 12:34:08 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 6/20/2013 12:15 PM, Allen Brier N5XZ wrote:
I will be getting an ICE 419A Bandpass filter soon at a good price. Wondering 
what is the best way to control it with a K3. Suggestions?

Sorry to be the bearer of bad tidings, but the "good price" for ICE 419-series filters is free. Several common problems.

#1, the relays get very flaky, and are hard to replace. Spraying them with the "right" contact cleaner is about the best you can do.

#2, the filters don't handle anything close to rated power, and even relatively small SWR (1.5:1) makes it worse. It's common for them to fail (blown capacitors) with 100W. They'll probably be OK at the 40-50W level needed to drive an amp.

#3, even when they're working they're not great filters.

#4, every ICE filter I've ever bought, new or used, was out of alignment (high SWR, tuning not right). A filter that is out of alignment is more likely to fry.

73, Jim K9YC
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