[TenTec] OII Audio testing/optimization

[Ron Castro]

To measure frequency response of a system, the gain must be held stable, 
otherwise, the ALC would make every tone fed into the mic connector show 
exactly the same output power.  That's what it's supposed to do.  In 
broadcast stations, the processors usually have "Proof" ("Proof of 
Performance") switches on them to disable all AGC and limiter action so that 
the true frequency response can be measured.  There is no such switch on 
most ham equipment, so the trick is to lower the input from the audio 
oscillator so the output is well below the ALC range.

That works great in analog rigs, but digital can be a different matter.  The 
Orion is designed to be relatively "goof-proof" as far as audio input levels 
are concerned, and the radio seems to "hunt" for levels and change them, 
even when they are very low.

Ron N6AHA

----- Original Message ----- 
From: "Barry Gross" <barry.n1eu at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Friday, March 24, 2006 7:09 PM
Subject: Re: [TenTec] OII Audio testing/optimization


> On 3/25/06, Ron Castro <ronc at sonic.net> wrote:
>>
>> I found it is pretty hard to
>> get the O2 to hold an audio level without it 'hunting' with its digital
>> and
>> analog gain controls and trying to correct the level, even when it's way
>> down.
>>
>
> Ron, I can't understand what you're saying here???
>
> 73,
> Barry N1EU
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