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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