Bill (W2ZV):
This looks very interesting and I'd like to give it a try. I assume that if
you set Auto filter selection and tell the Orion there is no 500 Hz filter,
it will use the 600 Hz filter from 750Hz on down to wherever the 250Hz
filter kicks in. Are you planning on running it that way, or will you
disable the 250Hz filter too?
73, Dick WC1M
> -----Original Message-----
> From: Bill Tippett [mailto:btippett@alum.mit.edu]
> Sent: Thursday, April 01, 2004 9:21 AM
> To: William H. Hein; orion@contesting.com; tentec@contesting.com
> Subject: [TenTec] #352 600 Hz Orion roofing filter kit
>
>
> At 04:21 PM 3/31/04, you wrote:
> >Bill: I am curious about the comment you made in the
> Ten-Tec mailing
> >list:
> >
> >"P.S. For another $40, Inrad's #352 kit will probably buy
> you another
> >~8 dB of IMD dynamic range at 1000 Hz spacings."
> >
> >I can't find an Inrad #352 kit on their Website. Do you
> mean the Inrad
> >752 IF filter (which is $115)?
> >
> >73,
> >Bill NT1Y ex-AA6TT
>
> The #352 is described here:
>
> http://dayton.akorn.net/pipermail/orion/2004-January/000199.html
>
> I just installed the first unit into Orion and it works
> great. The advantage is that it overcomes the intermod
> problems introduced by the extra amplifier following the 500
> and 250 slots. My estimate is that Orion's already excellent
> IMD for the 1000 Hz roofing filter,
> Preamp Off, will increase from ~85 dB to ~93 dB at 1000 Hz
> spacings. I sold my Inrad 400 which was in the 500 slot due
> to the IMD problems noted by ARRL, Sherwood Engineering and
> YT1NT. I don't think Inrad has their website updated to
> include this filter kit since it is brand new, but they
> should be adding it here in the near future:
>
> http://www.qth.com/inrad/exp_filt.htm
>
> The #352 has basically the same performance curve as the
> #350, but is centered on 9001.5 instead of 9000.75 allowing
> it to work properly in the 1000 filter slot.
>
> Here are a few construction details which I need to
> modify slightly since I have now completed my unit. Bottom
> line is, copy W2VJN's layout.
>
> http://users.vnet.net/btippett/inrad_.htm
>
> 73, Bill W4ZV
>
>
>
>
>
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