[Elecraft] K3 Audio Low Pass Filter

[Alexander Ponomarenko]

Just finished this "true to life" experiment . :-)
200 Ohm ProSet phones was loaded to phone-out parallel with sound card.
I don't see any difference with 200Ohm-loaded and not loaded pictures:
http://forum.cqham.ru/download.php?id=44172
RX-EQ = Flat always.

Alex

Brett Howard:
> What would be slick is if you had a pair of headphones and a headphone
> splitter Y cable.  Plug the headphones into one port and the sound card
> input into the other and then take measurements.  That would be a bit more
> true to life.
> 
> ~Brett
> 
> -----Original Message-----
> From: Alexander Ponomarenko [mailto:ur5lam at gmail.com] 
> Sent: Monday, July 06, 2009 8:40 AM
> To: Paul Christensen
> Cc: Brett Howard; Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 Audio Low Pass Filter
> 
> I think 100uF caps is enough value. Look these plots (with 100uF in 
> AF-amp),
> we see identifical plots for Line-out and for Phone-out.
> 
> logarithmic view: http://forum.cqham.ru/download.php?id=43583
> linear view: http://forum.cqham.ru/download.php?id=43582
> 
> 73! Alex
> 
> Paul Christensen :
>>> I've been informed Elecraft is already replacing those caps with 100uF
>>> caps in the current production units.
>>>     
>> My guess is that scaling the caps beyond 100 uF is only of interest to a 
>> small minority of ops.  The majority will probably be happy with the
> current 
>> choice of 100 uF.  Going from 10 uF in the prior design to 100 uF is
> already 
>> a significant step in the right direction.
> 
>