[TenTec] Ten Tec vs. Inrad 9 MHz Filters

[Jim Dunbar]

Hi Carl,

I have a question.

Do you know if most of the new Orion owners are buying the Orion with the
optional filters installed, or are they buying the
Orion as a stock radio without any optional filters?

In other words is it essential to have the optional filters as part of the
radio for CW operations?

Thanks Ahead of Time,

Jim
K4PV
----- Original Message -----
From: "Carl Moreschi" <n4py at earthlink.net>
To: <tentec at contesting.com>
Sent: Tuesday, April 15, 2003 3:16 PM
Subject: Re: [TenTec] Ten Tec vs. Inrad 9 MHz Filters


> Jim,
>
> There would be negligible difference by using the inrad filters in the
> Orion.  99% of the time, the DSP filters won't even need the a narrow
> roofing filter.  The difference between the tentec and inrad filters in
this
> application would be almost immeasurable.
>
> Carl Moreschi N4PY
> Franklinton, NC
> ----- Original Message -----
> From: "Jim Reid" <jimr.reid at verizon.net>
> To: <tentec at contesting.com>
> Sent: Tuesday, April 15, 2003 6:53 PM
> Subject: [TenTec] Ten Tec vs. Inrad 9 MHz Filters
>
>
> > Hi,
> >
> > I would appreciate a lead as to where I could find performance
> > curves for the Ten Tec filters say the 217, 218, and 219 optional
> > available for use in the Orion.
> >
> > I believe the TT filters are "less" steep skirted close in,  but are
> > actually more narrow further on out from the center frequency;
> > thus actually would perform "better" in the roofing filter application
> > in the Orion front end than the available Inrad models.  Curves
> > for the Inrad filters are found at:
> >
> > http://www.qth.com/inrad/tentec_menu.htm
> >
> > Couple of examples from the above site:
> >
> > Inrad 400 Hz BW CW 9Mhz filter, the #759, is down 6 dB at
> > a BW of 455 Hz;  and at 60 dB down it is 955 Hz wide;
> >
> > their 250 Hz filter, the #760, is down 6 dB at a BW of
> > 315 Hz; and at 60 dB down it is 700 Hz wide.
> >
> > But,  I have been told these actually "come back" up
> > and have less attenuation on beyond the close in curves
> > shown by Inrad at their site.  I do not know if this is true!
> >
> > Why,  well "only" 60 dB down is really not that large
> > an attenuation in some ham band situations,  and coming
> > back up again could really be bad.
> >
> > But,  I don't know how to compare to the "standard" Ten Tec
> > filters.  I had an Omni VI+ in the past equipped with the Inrad
> > filters in all slots,  replacing the TT filters.  At the time I was
> > not apprised of the possible benefit of staying with the standard
> > Ten Tec units;  that is,  perhaps not as steep close in skirts,
> > but they "stay  down",  hi.  Frankly,  I cannot say that the
> > Inrad filters "really" made the Omni a better performer,  but
> > I did not do a direct A/B comparison,  for obvious reasons:
> > I only had one Omni,  hi.
> >
> > Any comments,  actual data per this topic would really be
> > appreciated,  should you have any or know of a source.
> >
> > Would like my new Orion (coming in May?,  lot #2 somewhere)
> > to have the best roofing filter performance possible,  giving
> > the narrow IF-DSP filters the greatest opportunity to provide
> > super selectivity.  BTW,  have ordered the TT 1.8 kHz and
> > 500 Hz optional roofing filters to be included with my Orion.
> >
> > So far,  have heard of no one replacing Ten Tec filters in
> > their Orion with the now available Inrad filters for that
> > radio;  perhaps that is sacrilege!
> >
> > 73,  Jim  KH7M
> >
> >
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>
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