Sherwood Engineering Tests

[Dick Dickinson]

Thumbs up to Elecraft for keeping on top of good performance.

 

Perhaps someone will come up with and share a user modification for those
who might want to explore the potential enhancement as suggested below.

 

 

Best regards,

Dick - KA5KKT

 

 

"While it is possible to reduce audio IMD products even further, this
typically requires a class-A final audio output stage, which would add
perhaps 0.5 to 1.0 amps of additional receive-mode current drain (and an
associated heatsink)." - Wayne

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[Edward R Cole]

My K3/10 (SN 4043) was purchased on 3/5/2010 (per the invoice).  I'm
sure that I have the new DSP board and KXV3A. I know that it includes
the improved gain in the 1st IF.  I have not installed any upgrades
other than the EXREF and firmware updates.  It has three filters:
13/2.8/400 in main Rx and 2.8 in sub-Rx (KRX3).  It has KBPF3 and
KTCXO3-1.  I installed a minor HB modification to bring the sub-Rx IF
out to a BNC connector.

I do not use the internal speaker that seems a little harsh to me.  I
am using a very old ten inch National Speaker from the 1950's that
many might say is "too mellow".  Sound is fine using my SONY stereo
headset which has wider frequency response than the radio.

Another couple weeks and my K3 will be five years old.

73, Ed - KL7UW

From: Wayne Burdick <[hidden email]>
To: George Dubovsky <[hidden email]>
Cc: Elecraft Reflector <[hidden email]>,      "Wes \(N7WS\)"
         <[hidden email]>
Subject: Re: [Elecraft] Sherwood Engineering Tests
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=utf-8

Hi George,

I just checked the web site and I see that we've been shipping K3s
with the new DSP board since sometime in 2010. (Confirming that time flies.)

You can upgrade the DSP board from rev. C to rev. D for $109
(K3DSPUPGD); this includes both the audio low-pass filter and a bit
of an improvement in LF audio response. Or you can add just the audio
filter section as a small daughter board for $39 (K3DSPLPF).

The upgrade does improve the spectra as viewed on an audio spectrum
analyzer, but many operators won't be able to hear the effects by
ear. Those who can hear them have told us it was a major improvement.

Wayne
N6KR


73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     [hidden email]

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