[TenTec] eagle

[GARY HUBER]

Having worked in the telecommunications industry for over twenty-two years, 
with the initial five years with telephone transmission and switching of 300 
Hz to 3000 Hz (2.7 kHz bandwidth) circuits as optimized originally by Mr. 
Fletcher and Mr. Munson of Bell Labs  (see 
http://en.wikipedia.org/wiki/Fletcher%E2%80%93Munson_curves ), any filter of 
2.7 kHz or greater in the AM position will sound better assuming the low 
frequency rolloff can be pushed towards 200 Hz without rolling off the high 
frequencies near 3000 Hz. But its more than just bandwidth, the transmitted 
frequency response must be compensated in some manner or the audio will 
sound muddy and loose intelligibility.  It is a good idea to have have a 
flat transmitted signal with the low, mid-point, and high frequencies of the 
transmitted signal at about the same amplitude.


73 ES DX,
Gary -- AB9M

-----Original Message----- 
From: mcelmer1
Sent: Tuesday, February 12, 2013 3:09 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] eagle

Makes sense.

Mike
W8TRN
----- Original Message ----- 
From: "Rodney" <w3krq at dejazzd.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, February 11, 2013 11:21
Subject: Re: [TenTec] eagle


>I installed the filter in the am slot did a a/b test on 40m with 4 hams got 
>better audio with 2.8 than 2.4.
>
> -----Original Message----- 
> From: Barry N1EU
> Sent: Sunday, February 10, 2013 4:24 PM
> To: Discussion of Ten-Tec Equipment
> Subject: Re: [TenTec] eagle
>
> Is that filter is in the tx signal path of the Eagle?  The tx signal isn't
> filtered entirely in dsp with configurable bandwidth?
>
> 73,
> Barry N1EU
>
> On Sun, Feb 10, 2013 at 4:04 PM, Rodney <w3krq at dejazzd.com> wrote:
>
>> I got a 2.8 filter from inrad  for my Eagle  got great audio reports.
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