[TenTec] INRAD Omni VI roofing filter kit - success

[Steve N4LQ]

Bill
Someone suggested using the PROC button to activate the roofing. When in cw 
mode, it still supplies DC voltage when activated but of course the 
processor is inactive. The cw mode voltage can be picked off the control 
board an fed into a logic gate along with the proc voltage to activate the 
filter by pushing the proc button while in cw mode. Then you couldn't use 
the roofing filter when in SSB mode using psk-31 so we are back to square 1.
Hmmm. what about that VOICE button? Maybe......


Steve N4LQ
----- Original Message ----- 
From: "Bill Tippett" <btippett at alum.mit.edu>
To: <tentec at contesting.com>
Sent: Friday, January 14, 2005 9:51 PM
Subject: [TenTec] INRAD Omni VI roofing filter kit - success


> WA3JPG wrote:
> >The only thing you might have wanted is a separate switch to put the
> roofing filter in/out even when you have the NAR filter pressed.
> Normally, the NAR switch (or ONE of the NAR1 and NAR2 switches in the
> OMNI VI plus and option 3 versions) puts the roofing filter in line.
> You could, conceivably, use another switch somewhere else, and put the
> stock 15 kHz roofing filter in line (roofing filter mod out of circuit)
> when you wanted to without reference to any other switch.
>
>         Seems like a major goof by Inrad.  I have N4SU's Omni VI which
> I am checking out before I sell it for his XYL.  It has the special
> Ten-Tec 221 250 Hz filter centered on 9.000500 in the Narrow position
> for those like a low pitch (the 219 won't center if you set pitch to
> 400 Hz).  If someone were to install Inrad's roofing filter as
> currently implemented, they have 2 choices:
>
> 1.  Leave the 221 in and live with the fact that you would never be
> able to have anything but a 250 Hz bandwidth when you engaged the
> roofing filter and 250 Hz is not very practical for general tuning.
>
> 2.  Remove the 221 so that depressing Nar only engages the roofing
> filter.  Not a nice solution since then you can't use the 221.
>
>         The alternative of a separate switch for the roofing filter as
> you suggested is very good.  Then you could engage it AND separately
> engage Nar when you wanted the 250 Hz 221 inline.  Hopefully George
> will get feedback from his beta testers and come up with a better
> solution before he goes into final production.
>
>                                         73,  Bill  W4ZV
>
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