I've always been able to eliminate RFI in amplified computer speakers by
wrapping as many turns as I can get of the audio and power leads around
ferrite toroids.
The problem I've had is that they sound awful, especially with CW. They
tend to buzz at particular frequencies. Maybe I've just had bad luck
with the ones I've tried.
On 3/28/2014 10:56 AM, Doug Person wrote:
This has been a significant problem for the powered speakers I have
tried. Even the West Mountain Radio speakers that are supposed to be RF
proof are not RF proof.
I'm going to try a few of the single-ic audio chips to see I can produce
enough clean audio while avoiding the RF feedback problem.
Doug -- K0DXV
On 3/27/2014 11:47 PM, Jim Brown wrote:
On 3/27/2014 6:02 PM, Ross Primrose N4RP wrote:
Just use a pair of small amplified computer speakers
Be careful about that -- most amplified loudspeakers have RFI problems.
Remember that the KX3 is specifically designed to be a backpacking
rig, so everything, including the audio amp, is designed to be stingy
about using battery power.
One simple thing we can do to maximize the audio output level is to
use RXEQ to roll off the lower three bands. The sound in these lower
bands makes no contribution to communications, but it does use power,
so when we get rid of it, we can use the power for the sound that
matters.
73, Jim K9YC
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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