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,
----- Original Message -----
From: "Carl Moreschi" <email@example.com>
Sent: Tuesday, April 15, 2003 3:16 PM
Subject: Re: [TenTec] Ten Tec vs. Inrad 9 MHz Filters
> 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
> application would be almost immeasurable.
> Carl Moreschi N4PY
> Franklinton, NC
> ----- Original Message -----
> From: "Jim Reid" <firstname.lastname@example.org>
> To: <email@example.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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