[Elecraft] K3 Rev C +AF filter

[David Olean]

I have two K3s, one has  the new DSP board, so I hooked them up together and 
listened to low frequency tones. The higher SN radio definitely has more 
bass. In fact I have noted a few times, just how low it goes. It seemed very 
unusual for a communications radio to do that. So I listened to the older 
one and it has less bass, but to be honest, I don't see a problem with it. 
It sounds just fine to me. Now if it was my stereo FM receiver I would heave 
it out, but I chase DX with it and see no big reason to update it. I guess 
it is a personal decision for folks. I am using a Heil headset to make the 
comparison. I am almost 65 years old and my hearing is hosed on the high 
end. I am not sure if it is from the several decades of weak signal work, or 
having way too much fun in the 60's, but my upper limit is now a bit over 6 
or 8 kHz. I tune in CW at about 450-500 Hz.

Dave K1WHS

----- Original Message ----- 
From: "Vic K2VCO" <vic at rakefet.com>
To: "k4pi" <k4pi at bellsouth.net>
Cc: <elecraft at mailman.qth.net>
Sent: Thursday, December 17, 2009 9:43 PM
Subject: Re: [Elecraft] K3 Rev C +AF filter


> k4pi wrote:
>> I am anxious to see what the new board will do.  I have used QF1A for 
>> many
>> years and never found a radio yet where it did not enable me to copy 
>> signals
>> much better.  I treat my QF1As like gold and never operate without one in
>> the Peak mode.
>
> All the board changes do is improve low end response, which in my opinion 
> is already more
> than good enough for CW and SSB work.
>
> The 'filter' mentioned is not a peak or null filter, but just a lowpass 
> filter to remove
> some very high-pitched DSP artifacts that bother some operators.
>
> In my opinion, this replacement board is not something that everyone 
> needs. I will
> probably order the filter sub-board by itself when it becomes available 
> even though I'm
> probably too old to hear the DSP artifacts in question, but don't intend 
> to bother with
> replacing the DSP board.
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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