[TenTec] corsair scratchy audio

[Ken Brown]

18 Amperes would be a reasonable current draw for a (12 V DC powered) 
rig in CW mode during key down, producing near full 100 watt output. In 
SSB mode the current draw peaks should reach that same level, but for 
such a short duration the hum associated with high current load on the 
power supply should  be barely noticable if any. What happens with mic 
gain and RF output level pots turned all the way down (unfamiliar with 
Corsair, I'm only guessing it has both controls as my Ten-Tec rigs do) , 
during PTT activation? If there is power supply hum in that case I would 
say there is a problem. How about RF output measurement with mic gain 
all the way down? Should be zero, unless balanced modulator is not balanced.

DE N6KB


Clark Savage Turner wrote:
> On May 28, 2006, at 5:01 PM, James Pearson wrote:
>
>   
>> was tuned into 500w dry load out put on external avg watt meter was 
>> aprox 50 watts did tune a short wave rec to same freq and tried 
>> different drive settings processor produces some level of hum amp draw 
>> on power sup aprox 18amp.
>>     
>
> Hum?  Processor?  OK, turn off the processor completely, those can 
> really mess up the audio anyway.  Put on the non amplified mike, 
> processor off.  Keep the drive control all the way down, turn it up 
> until the little ALC light just barely lights on voice peaks (really!  
> just barely lights when you shout!)  Then listen on the external 
> receiver.  See if it improves at all.  Note any changes in how it 
> sounds.  Hum on SSB peaks can be the power supply caps sagging when the 
> draw goes up quickly.  Do you have another power supply to substitute?  
> Do you have a car battery to substitute for the power supply for a 
> temporary test?  That can be helpful.
>
> WA3JPG
> Clark Savage Turner, J.D., Ph.D.
> Professor of Computer Science
> Cal Poly State University
> San Luis Obispo, CA. 93407
>
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