[AMRadio] Ebs Test failure

[Brett Gazdzinski]

Its a lost art, like radios with tubes.
10 years ago it was very hard to get one that worked right, the FAA used 
them for remote voice to radios, and we put a monitor tone on it, and 
notched it out.
The circuits had to be verified working so we put a 3250 tone on them, and 
had to run all the analog tests, including a freq sweep every 100Hz, and it 
had to be flat +.5 db  -1.5 db from 304 to 3404.
Very tricky over miles of copper.
They had units that did auto eq, but they made most lines go way hot above 
2800 Hz and could not be used.
There were only a few guys around then (10 years ago) that understood how to 
do it.
And that is well short of 15 KHz.
It would make a lot more sense to go digital, and some people used a 
switched 56 kb line with an encoder for remote voice.
Now, you just get a dsl line and put whatever you want on it I suppose.

Brett
N2DTS




----- Original Message ----- 
From: "Kevin Raper" <kj4hyd at gmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Friday, November 11, 2011 9:20 AM
Subject: Re: [AMRadio] Ebs Test failure


>
> On Nov 11, 2011, at 8:38 AM, James M. Walker wrote:
>
>> Do you guys have any idea how hard it is to get a "TELEPHONE LINE" into 
>> ur
>> home these days.
>
> You should TRY to get those morons to understand you want a 15KC Equalized 
> Line!
>
> 73,
> Kevin Raper
> KJ4HYD
> CE WCKI WQIZ WLTQ
>
> There is no limitation to the fidelity of AM radio. From a mathematical 
> standpoint, AM does better in frequency response than FM. - Leonard Kahn
>
>
>
>
>
>
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