Julian, others ...
West Mountain Radio has the "COMspkr" back in stock.
I ordered a set at the Visalia DX Convention and they
were promptly shipped when the folks returned home.
They work well and I have no interference from 1KW on
HF and 600W on 6m within ten inches of the unit(s).
73! Ken Kop
I have Harman Kardon speakers & sub on my Mac via USB and another pair,
different model, same manuf., traditional audio from headphone out, generally
no poblem. Never had any RFI on the Mac ones, occasionaly get it on the others
- but I have a lot of RF in the shack (something I need to fix).
73
All computer speakers are amplified. Many of them have very poor immunity to
RF. I have sometimes reduced RFI to acceptable levels by winding a couple of
turns of the cables through snap-on suppression toroids. Winding several
turns through a large ring toroid would be more effective as the snap-o
Hi,
Just to be clear, I'm not using the speakers with the radio, I'm using them
with my PC which is in the same room as the K2.
I don't know if my PC requires amplified speakers or not.
73
Brian - N5BCN
-
K2 #6800 KSB2 KAT2 KIO2 KNB2
--
View this message in context:
http://elecraft.3657
On Sat, 29 May 2010 11:10:39 -0700 (PDT), Brian - N5BCN wrote:
>Thanks for any suggestions!
W4TV has given you great advice. 99.9% of all amplified speakers have RFI
problems at some frequency, including pro products with major brand names.
The usual causes are 1) lousy shielding 2) lack of RF
sh a sound for
my ears. I use a Sony MDR-V600 stereo headset and audio from the
radios sounds fine with it.
73,, Ed - KL7UW
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Message: 7
Date: Sat, 29 May 2010 19:54:06 -
From: "Ken Kopp"
Subject: Re: [Elecraft] RFI PC Sp
One thing that I believe has not been mentioned in this thread is a very
simple solution to the hum problem. Since the K3 already has an audio power
amplifier, amplified speakers are not really needed. I had an old pair of
computer speakers - which hummed every time I transmitted on the K3. Then I
Hi Joe,
I'm going to try your suggestion.
The way I understand your post is that you installed the bypass caps
directly on the amplifier board, one cap for each speaker wire, each
grounded to the circuit board's ground? My speaker's circuit board is
difficult to work on, could I accomplish the
Almost any commodity computer speakers can be cleaned up
by adding a simple bypass cap across each of the speaker
leads. The most difficult cases respond to a basic pi-
section filter at each speaker output and on each input
channel.
I cleaned up all of my computer speakers by adding a .01
or .0
3:54 PM
To: Brian - N5BCN; elecraft@mailman.qth.net
Subject: Re: [Elecraft] RFI PC Speaker Hum
Hi Brian,
It's a more costly solution, but I ... and others ... swear by the
COMspkr(s) from West Mountain Radio. They work well, and even sound pretty
good when listening internet radio stations.
Hi Brian,
It's a more costly solution, but I ... and others ... swear
by the COMspkr(s) from West Mountain Radio. They
work well, and even sound pretty good when listening
internet radio stations.
73! Ken Kopp - K0PP
elecraftcov...@rfwave.net
_
Hi all,
I'm experiencing the dreaded PC Speaker hum every time my K2 transmits, even
when power is dropped to about 2 W.
The speakers are Harmon Kardon amplified speakers and they do not hum when
turned off. Per other threads, I plugged the speakers' wall wart into the
same outlet as the K2 and
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