[Elecraft] Low Serial Numbered K3

[Joe Subich, W4TV]

On 2014-09-24 1:17 PM, Jim Brown wrote:
> I'm an audio geek, and I see no need for RX audio below 300 Hz in a
> ham RX. Rolloff above 4 kHz is a good thing, but not worth $110 to
> me. :)

After 25+ years in broadcasting and recording studios, I agree.  The one
audio response modification I put in both of my low S/N K3s is the low-
pass audio filter just to eliminate the high frequency audio IMD and DAC
clock leakage.  The resulting ~100 - 4500 Hz response is just fine for
occasional AM broadcast - including music - using a decent speaker.

The original 10 uF coupling capacitors on the headphone output are just
fine with headphones other than the cheap 8 Ohm stuff and provide
reasonable response to 200 Hz or less with most quality headphones or
headsets.

73,

    ... Joe, W4TV


On 2014-09-24 1:17 PM, Jim Brown wrote:
> On Tue,9/23/2014 5:41 AM, Mike K2MK wrote:
>> The DSP board upgrade is considered very important by many K3 owners
>> and it
>> is not listed with the other K3 mods on the mods and notes page. You can
>> find it only on the spare parts page. It is called K3DSPUPGD.
>
> I'm an audio geek, and I see no need for RX audio below 300 Hz in a ham
> RX. Rolloff above 4 kHz is a good thing, but not worth $110 to me. :)
> Now, if you want to use your K3 to listen to AM broadcasts including
> music, that's a different story. BUT -- $110 comes close to getting you
> one of the excellent Tecsun consumer AM/FM/Shortwave/Aircraft band
> receivers like the PL660 ($120) or PL880 ($180). The PL880 was recently
> reviewed in QST. I own a PL660 and the much smaller PL380, which is my
> "hotel" radio.
>
> 73, Jim K9YC
>
>
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