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Re: [TowerTalk] Bandpass filters - ICE vs Dunestar

To: "David Hachadorian" <>,"Towertalk Reflector" <>
Subject: Re: [TowerTalk] Bandpass filters - ICE vs Dunestar
From: Jim Lux <>
Date: Mon, 31 Jan 2005 16:08:37 -0800
List-post: <>
At 03:42 PM 1/31/2005, David Hachadorian wrote:

In the ICE design, the signal path goes through 12 sets of relay contacts, 10 of which are normally closed. W7WW has complained about intermittent signal dropouts on receive, where he either has to physically smack the box, or transmit one DIT to break through what is apparently an insulating film on one of the normally closed relay contacts.

DO you mean that there are essentially 6 filters in series which are either in the circuit, or there's a shunt around it?

As opposed to having a (effective) 1P6T switch on each side of a bank of parallel filters? (The latter is what is typical in transceiver LPF sections)


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