The audio filter

[WA2JJH]

The two blue pots on the audio filter seem to offer a great range of audio  
filtering.
However with the pots and software, I cannot get on effect I want.
 
  It might be impossible to do even if I mod it. I simply want to  lower the
noise floor.
The noise floor is low. However I wanted to try to get it to sound like a  
TR-7's noise floor.
Perhaps I should consider the DSP kit/up grade?
 
  My chip on my audio filter is a rev one. Is there a firmware update?  Or is
this chip limited to how much it can do with the multiple op-amp  chip?
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[Bill Coleman-2]

On Feb 26, 2005, at 10:55 PM, [hidden email] wrote:
> It might be impossible to do even if I mod it. I simply want to  lower
> the
> noise floor.
> The noise floor is low. However I wanted to try to get it to sound
> like a
> TR-7's noise floor.

Looking at the reviews in QST - the noise floor on the TR-7 was
measured at -133 dBm on both 80m and 20m.

The noise floor on the K2 was measured at -137 dBm on 80m, and -138 dBm
on 20m.

So, you're saying you want to WORSEN the noise floor by 4-5 dB?

The noise floor is low enough on either rig that atmospheric noise
should dominate the receiver, at least 20m and below.

Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Quote: "Not within a thousand years will man ever fly!"
             -- Wilbur Wright, 1901

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[Jessie Oberreuter]

On Sun, 27 Feb 2005, Bill Coleman wrote:

> On Feb 26, 2005, at 10:55 PM, [hidden email] wrote:
>> It might be impossible to do even if I mod it. I simply want to lower
>> the noise floor. The noise floor is low. However I wanted to try to get
>> it to sound like a TR-7's noise floor.

> Looking at the reviews in QST - the noise floor on the TR-7 was measured
> at -133 dBm on both 80m and 20m. The noise floor on the K2 was measured
> at -137 dBm on 80m, and -138 dBm on 20m. So, you're saying you want to
> WORSEN the noise floor by 4-5 dB?


      Heh, take the IF gain down a bit -- should do the trick :).

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