Hallo John,
tnx for proposal, a will try with some attenuation.
Gary AB7MY from Elecraft have helped me with some interesting proposals too.
I completely agree with you, unfortunately mein KX3 showes the same behewior
(hiss when RF put on zero), but in contrary to my K3, this hiss disappeared
Not sure this helps much other than knowing you are not alone.
I have had the same problem and fixed it exactly as John - VK7JB has - SN on my
K3 is in the 800s.
I have checked my S/N ratio and it is at least as good as the spec.
My hearing has been checked here at work and I have been told that
I suggest adding a second resistor, across the headphones' cord, forming a
pad instead of just a series resistor. Approximately 50 ohms shunt will
restore damping effect to the headphones' response. This is good practice.
73,Roy K6XKIowa
One spec pertaining to headphones, and one not realized in terms of the
importance, is sensitivity. The more sensitive the headphones means it
takes less audio power to produce acoustic energy. If a given signal
say a value of -25 dBv is applied, this signal may be heard with some
Hi,
i have studied all the posts about this topic.
Seems, that is still, huge confusion about that, so i will try to formulate
a problem on simply way:
*With low impedance earphones plugged into the audio jack on the K3, you can
hear a really annoying noise (hiss) even with the AF and RF volume
Hello Bozidar,
I have K3 #5102 and also well preserved high frequency hearing. I've had the
same hiss on my K3 audio since it arrived from the factory. I've used a wide
range of headphones, expensive and cheap, and it's present with them all. I
discovered that the fix is to introduce some
Hi Dale,
tnx for interesting info - i have done this test and ranges on AF and RF
knobs are 2-240, so no problem with that.
Yes it is an early K3, S/N 28xx.
I use Sennheiser CX 300-II ear-canal phones impedance 16 Ohm - maybe is this
impedance too low,
but accordingly to the data-sheet for LM4811
with each side
of your phones will do the trick.
73, Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of bozidar
Sent: Tuesday, September 29, 2015 9:53 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 - background
I do not notice any hiss with K3 with any headphones. I noticed hiss with
other radios.
Ignacy, NO9E
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View this message in context:
http://elecraft.365791.n2.nabble.com/K3-background-hiss-noisy-K3-update-tp7608490p7608498.html
Sent from the Elecraft mailing list archive at Nabble.com.
Hello Bozidar,
I suspect that the issue may be particular to your particular K3. You did
not mention the S/N range of your radio, and I may be incorrect about this
but I think that very early K3's had an issue similar to this, that was
quickly resolved.
The S/N of my K3 is in the 58XX range, and
Of Adrian
Sent: Saturday, April 28, 2012 8:06 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 - background hiss
You guys are on the wrong track, NR is a waste of time on the K3 on SSB, esp
low bands and attenuation ATT and/or RF gain reduction is way better to keep
audio clarity whilst making
While tweaking the rx EQ may help mask the problem I feel the root cause
is that the AGC operates at too low a signal level.
I like to set my RF gain at a level where I can hear what I want but
not the band noise. If I then engage the AGC it has the effect of
increasing the gain by 2 or three S
Yup. Great big clue there :) 73, Guy.
On Sun, Apr 29, 2012 at 1:19 PM, John Chappell G3XRJ j...@g3xrj.com wrote:
My receiver is fabulously quiet with the AGC off.
73 John G3XRJ
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Elecraft mailing list
Home:
I have had my K3 for a couple of months - so I am still learning.
At this point, my primary concern is the amount of background hiss that
I have when no signals are being received. For example: When on 75 this
AM I am listening to a local net. When no one is talking the background
hiss rises.
Bill,
That is the AGC which makes it sound like that. Look at my webpage
article dealing with Noisy K3 to give you some information about how
to adjust the AGC parameters to reduce that effect.
73,
Don W3FPR
On 4/28/2012 9:00 AM, Bill wrote:
I have had my K3 for a couple of months - so I am
I remember that my Kenwood 850 was quiet like that compared to my Yeasu 990.
Possibly how the agc is handled by Kenwood?
Sent from my iPad
On Apr 28, 2012, at 8:07 AM, Bill b...@w2blc.net wrote:
I have had my K3 for a couple of months - so I am still learning.
At this point, my primary
I have a Kenwood TS-590S for a back up to my K3 and it has a noticeably quieter
background than the K3.
I believe we should be able to address this with the NR in the K3, I'm still
learning how to adjust the NR.
Bob
K6UJ
On Apr 28, 2012, at 12:15 PM, hawley, charles j jr wrote:
I
Bob,
The K3 has more reserve gain than most other receivers, and the lack of
signals cause the AGC to set the receiver top full gain.
With other receivers, I usually can run the preamp to advantage, but
with my K3 it is fine without the preamp on.
Do you have the preamp on? If not, perhaps
Don,
I usually leave the preamp on and not really needed as you said. I will try
backing down the RF gain
a tad also. Thanks for the info.
I found too, unless I have other noise issues to deal with, setting the NR at
F1-1
reduces the hiss quite a bit, and no impact at all on the sig. Just
You only need set PRE/none/ATT and RF gain correctly. Many people seem to
thing that RF gain at max all the time and PRE on all the time, for all
bands all the time, is the normal setting.
You can make this exact same error on a Ten-Tec Orion. PRE/ATT/RF gain
need to be set for ambient noise
CW or SSB or both? How old is the K3? There was a DSP swapout that
addressed this. For SSB I drop the FC on the filter down to about 1.0
which helps. There were some other settings that might help. Check the
archives.
Mike W0MU
W0MU-1 CC Cluster w0mu.net
On 4/28/2012 5:35 PM, Bob K6UJ
You guys are on the wrong track, NR is a waste of time on the K3 on SSB, esp
low bands and attenuation ATT and/or RF gain reduction is way better to keep
audio clarity whilst making noise transparent. Recommend; AGC threshold = 8
AGC slope = 0.
This white noise issue is fixed with N1EU pink noise
Bob,
I would discourage you from using the preamp except on the higher bands
where the atmospheric noise is lower.
I would also discourage you from using NR for that purpose.
The K3 is a contest/DX class transceiver, and like a fine race car, does
need to have a little more than casual all
Guy,
Thanks for the info.
I think I have afraid I wont be able to copy weak signal fobia, hihi.
I need to experiment more with the RF gain and PRE and convince myself that
that I am not sacrificing weak sig copy.
My problem lies in the space between the headphones, hihihihi
Bob
K6UJ
On Apr
Bob,
Guy is giving you a lot of good advice, and he has some serious
operating skills behind him, so he knows what he is saying.
Maybe you can think of it this way -- You can't copy (with your ears)
signals that are buried in the atmospheric noise, so why make that noise
louder.
73,
Don
*Adrian,
My experience with those settings are the same as yours.
Works for me.
73's
Gary
*
On 29 April 2012 10:06, Adrian vk4...@bigpond.com wrote:
You guys are on the wrong track, NR is a waste of time on the K3 on SSB,
esp
low bands and attenuation ATT and/or RF gain reduction is way
I use a Datong FL3 audio filter and the difference to my ears is amazing. The
K3 sounds a lot lesser hissy and is very warm sounding when compared to the
unfiltered radio. Yes, I have tried all AGC and EQ settings.The difference can
not be equaled by just adjusting the RX EQ or by using
Bob,
Guy is giving you a lot of good advice, and he has some serious operating
skills behind him, so he knows what he is saying.
Maybe you can think of it this way -- You can't copy (with your ears)
signals that are buried in the atmospheric noise, so why make that noise
louder.
73,
Don W3FPR
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