[CQ-Contest] Bandpass filters for M/S or M/M environment

[Alfred J. Frugoli (KE1FO)]

Unless I'm crazy, the two 419A's I just hooked up required sinking to ground to select the band - would have made my life a whole lot easier if they were source driven!

Just to check my sanity, I surfed to http://www.arraysolutions.com/Products/ice/filtersrf.html#3
and "Band selection is done from the front panel directly by the operator with the main knob control or by automated means derived by ground closure to the 8-pin DIN connector on the rear panel surface."

Maybe the switching arrangement changed at some point, mine are brand new.

73 de Al, KE1FO

----- Original Message -----
From: David Hachadorian
Sent: 6/10/2004 6:58:22 PM
To: cq-contest at contesting.com
Subject: Re: [CQ-Contest] Bandpass filters for M/S or M/M environment

> 
> ----- Original Message ----- 
> From: "Mihail Mateescu" <yo3ctk at alltrom.ro>
> To: <CQ-Contest at contesting.com>
> Sent: Wednesday, June 09, 2004 9:03 AM
> Subject: [CQ-Contest] Bandpass filters for M/S or M/M environment
> 
> 
> > Hello,
> >
> > We are in the process of upgrading the YR7M site from SO capable to
> M/S.
> > That means, among other, a second workplace equipped with
> transceiver and
> > linear amplifier. We expect to need bandpass filters at each
> workplace.
> >
> > We have identified three manufacturers for such filters (homebrew is
> > excluded since we have barely enough free time to set-up antennas):
> >
> > ICE via WX0B: model 419A, $228
> > W3NQN via WX0B: set of 6 filters, $525 plus FM-6 switch, $165
> > Dunestar model 600, $339
> > All models are 200W capable.
> 
> I use two Dunestar 600's, which I purchased used, and they have worked
> well for me for about five years. My antennas are only 6 - 10 feet
> apart and I run 1500W. You need to build your own little manual or
> automatic control box for these units. The Dunestar units can be wired
> for either +12vdc or ground switching.
> 
> My friend W7WW has a pair of ICE filters, and they also work well for
> him, with his closely spaced antennas and 1500 watts. He has had a few
> problems with his though. On initial delivery, one of his boxes had a
> problem with the received signal intermittently dropping out. That
> unit was replaced by the manufacturer. He has also blown a few
> capacitors in the ICE units, even with 100 watts of drive. The caps
> actually change value, rather than blow, but the swr goes sky high.
> The manufacturer has provided replacements, but we get them a lot
> faster from a commercial source (Mouser). It is fairly easy to change
> the caps. He now has two low-drive amplifiers, which has solved that
> problem for him, at least in the high-power contests. The ICE units
> come with a manual DC switch that picks up the internal relays. The
> ICE units use +12vdc switching. There is no provision for ground-type
> switching.
> 
> Dave Hachadorian, K6LL
> Yuma, AZ
> 
> 
> 
> 
> 
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