I have one other thought with regards to V1 and V2 on the Orion. On AM, the
bandwidth with V1 is actually double the filter size. So a 6 khz filter on
V1 is actually 12 khz which is 6 khz each side of the carrier. In V2, the 6
khz filter is really 6 khz which is 3 khz each side of the carrier. The end
result is the wider bandwidth available in V1 should make V1 sound much
nicer. V2 really needs an 8 k selection for AM. The funny thing about this
is way back when the rx320 first came out, the maximum bandwidth was 6 khz.
But people complained about AM fidelity and they added an 8 khz filter for
AM in the second firmware release.
Carl Moreschi N4PY
121 Little Bell Drive
Hays, NC 28635
----- Original Message -----
From: "Larry Menzel" <firstname.lastname@example.org>
To: "Discussion of Ten-Tec Equipment" <email@example.com>
Sent: Tuesday, January 23, 2007 9:17 PM
Subject: Re: [TenTec] AM Receiver distortion in Orion II
> Number 1, I think it depends in large measure on the quality of the
> playback. I listened first on my stereo speakers on my computer and I
> varied the bass as I listened. I had to lower the bass response on the
> Orion bit, and increase it on the Kenwood part to make either sound like
> "normal" AM audio. I agree with Carl, it would seem that the Kenwood bit
> is too good for a 3KHz passband.
> Number 2, There is clearly a difference between the two recordings, so
> someone in Tennessee has a tin ear? Hey...poking a little fun
> here....nothing serious.
> I think both recordings when played back on a good sound reproduction
> sound excellent. The "muddy" factor, I suppose is simply the bass
> on a particular play back system.
> Larry, N0XB
> ----- Original Message -----
> From: "Dennis Jones" <firstname.lastname@example.org>
> To: "Ron Castro" <email@example.com>; "Discussion of Ten-Tec Equipment"
> Cc: "Dennis Jones" <firstname.lastname@example.org>
> Sent: Tuesday, January 23, 2007 7:05 PM
> Subject: Re: [TenTec] AM Receiver distortion in Orion II
> > Ron,
> > Sounds good to me, in fact quite good.
> > DJ K6RCL
> > On Jan 23, 2007, at 2:54 PM, Ron Castro wrote:
> >> One of the items on my "wish list" for the Orion II is to fix the
> >> AM receive audio, which sounds to me like a problem in the DSP code
> >> that causes distortion and 'muddy' sound. It's most noticeable
> >> during selective fades that cause a serious clipping effect. Last
> >> night, I made an MP3 of a local AM radio station comparing the O2
> >> to a TS-870, and sent it to TT service. This morning, TT said they
> >> couldn't hear any difference between the two receivers. Is it my
> >> ears or what? The link to the clip is below. The O2 is the first
> >> 60 seconds and the 870 is the second 60 seconds. Bandwidth on the
> >> O2 is 6 kHz, while the 870 is 3 kHz, although as you'll hear, it
> >> sounds just the opposite!
> >> http://n6ie.com/OrionII_vs_870.mp3
> >> Can anyone besides me hear the difference?
> >> Ron N6IE
> >> www.N6IE.com
> >> (Formerly N6AHA)
> >> _______________________________________________
> >> TenTec mailing list
> >> TenTec@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/tentec
> > Dennis Jones
> > email@example.com
> > _______________________________________________
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