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Re: [TenTec] Loss of Audio in 2054

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Loss of Audio in 2054
From: Alan Sewell <alan.n5na@gmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 15 Feb 2006 09:52:53 -0600
List-post: <mailto:tentec@contesting.com>
I may be out of place posting this but Gary explained the reduction in 
audio to the beta group as follows:

"The V1 firmware contained an AF AGC in addition to the IF AGC. This 
resulted in a better leveling of the overall audio but at the cost of 
adding to noise levels and effectively canceling the RX EQ functions. 
V2 doesn't add leveling to the audio. In places where there is some 
impact on the audio levels, like below 150 Hz the V2 version makes it 
worse because we run twice the DSP filtering that was in the V1 

I think that explains it a bit better than the FAQ.


Alan  N5NA

Toby Pennington wrote:
> The loss of audio between 200hz and 100hz when in cw mode is problematic for 
> me,  even though I have seen some posts that indicate it is not big deal for 
> others.  
> I commonly narrow down the cw filters to 100hz which eliminates a lot of 
> noise,  especially Qrn type noise.  I am further disappointed that Ten Tec 
> has come to the conclusion that this behaviour is an acceptable trait of the 
> DSP filter as explained in their faq notes.  This indicates to me that they 
> have tried to fix this problem,  but have been unable to and need to offer a 
> plausable explanation as to why it is happening. 
> I don't buy that!   This loss of audio was never an issue in the 1.xxx 
> versions.  You can turn down the BW to 100hz and have the same audio strength 
> that you had at 200Hz.  IF the loss of audio is inherent then why does it not 
> happen in 1.xxx versions.   
> I believe this needs looking into further and not just glossed over with a 
> sentence or two explaining it away.  If anyone has additional information 
> which could shed some light on this subject I would like to see it.    
> Toby  W4CAK
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