[TowerTalk] Bandpass filters - ICE vs Dunestar

[David Hachadorian]

----- Original Message ----- 
From: "Jim Lux" <jimlux at earthlink.net>
To: "David Hachadorian" <K6LL at adelphia.net>; "Towertalk
Reflector" <towertalk at contesting.com>
Sent: Monday, January 31, 2005 5:08 PM
Subject: Re: [TowerTalk] Bandpass filters - ICE vs Dunestar


> 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)
>
>

That's exactly what I mean.

I didn't have any documentation when I was working on the
unit, about a year ago, but that's the way I remember the
configuration. Maybe an ICE 419 owner can confirm. They will
probably have to take the cover off to figure it out,
because there's not much in the way of support
documentation.

Dave Hachadorian, K6LL
Yuma, AZ