Thanks for the info. I learned something new about my Omni VI.
Mark
----- Original Message -----
From: <K3BU@aol.com>
To: <tentec@contesting.com>
Sent: Wednesday, February 11, 2004 2:35 PM
Subject: Re: [TenTec] Omni6+ mods: 125hz cw filter and 2 khz roofing filter
> In a message dated 2/11/04 1:33:09 PM Eastern Standard Time,
> mark@microenh.com writes:
> >>I didn't realize that there were 3 filters in the chain. I only thought
that
> there were the two at 6 MHz and 9 MHz. Was the 600 Hz roofing filter a
> hardware change? I assume that this dedicates the radio to narrowband
modes
> as a 600 Hz roofing filter would be too narrow for voice.<<
>
> There are actually 4 filters in the chain. The first one is the monolithic
> filter Y1 that is 15 kHz wide and that is actually the roofing filter.
This one
> is hard wired in and this one, for non FM types, could be replaced by
narrower
> filter. Not much room around, but it is not impossible
> to replace it with narrower one. If it was placed on the socket, it would
> have given us nice option of tailoring the rig and perhaps beating the
rest of
> the rigs in specs.
> Then we go to Y2 which is 9 MHz 2.4 kHz wide standard SSB filter and it is
> socketed. The optional 9 MHz filter is in series with Y2. This is what
allows
> easy cascading of say 600 Hz filters in 9 MHz IF.
> Then going through another conversion there is the 4 position 6 MHz filter
> bank. Those are the third filters in the plug-in chain.
> I "dedicate" the Omni before the contest to CW and place 1 kHz or 600 Hz
> filter in Y2, 500 in 9 MHz optional position, and selection from 1 kHz,
500, 250
> and 125 in 6MHz bank, either of TT or Inrad breed.
> There is plenty of room inside TT radios, so filters could be wired with
> switching arrangement. Or just plug those race horses that you need for
the
> upcoming race (less blow-by).
>
> 73 Yuri, K3BU
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