[CQ-Contest] Difference between the ICE 419 419A & 419B bandpass filters
k9yc at audiosystemsgroup.com
Wed Sep 10 12:10:53 EDT 2014
On Wed,9/10/2014 6:48 AM, Jay Terleski wrote:
> The AS-419 is manually controlled with pushbuttons, and also is on the
> Shacklan 4 wire network, as well as can be controlled with a DB9 input jack
> like the 419b from ICE. See it here
Based on my testing and review of bandpass filters a few years ago, I
would expect Jay's implementations in his redesign to be significantly
better than Ice's. There were several problems with the ICE filters.
First, their capacitors were under-rated for real world conditions, so
even a modest mismatch would fry them. Second, relays tended to go
intermittent, and fixing that required major disassembly (and probably
realignment). Third, their attenuation characteristics weren't very good.
In my tests, the W3NQN-designed filters that Jay sells were the best
performers in every respect.
73, Jim K9YC
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