Hi Graham
Yes. With or without that cable seems to make no difference.
Regards
John G4ZTR
-Original Message-
From: Graham Kimbell G3TCT [mailto:g3...@lineone.net]
Sent: 24 March 2011 20:49
To: John Lemay
Cc: elecraft@mailman.qth.net
Subject: Re: Re: [Elecraft] [K3] Noise from P3
On 3/23/2011 9:39 PM, David Pratt wrote:
That being so, Alan, is there any value in supplying screened cable for
the power lead rather than the twin 'bell wire' used at present?
Not if it is common mode current, coupled from signal common onto the V-
wire. Go to my website and study the
is a non-starter for me.
John G4ZTR
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: 24 March 2011 06:03
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
On 3/23/2011 9:39 PM, David Pratt
On 3/24/2011 1:04 AM, John Lemay wrote:
In fact if anything it is a little worse this morning,
but these are not lab measurements.
FWIW -- the P3 display is a VERY good indicator of voltage at the IF,
and you can easily set it to read out in dB, and with very high resolution.
I'd say take it
On 19:59, John Lemay wrote:
Well, I have undertaken a lot of work to address this problem:-
John have you tried disconnecting the RS232 connection between K3 and P3?
Graham
G3TCT
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Elecraft mailing list
Home:
No apparent noise from the P3 on 144.225 here, either. The P3 is
resting against the feet on the right side of the K3. My antenna is
100' away at 65' and was pointing at the shack.
Bob K5SM
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Elecraft mailing list
Home:
While operating on SSB on 144.225 MHz using the internal K144VX
transverter I am getting broadband noise around that frequency when I
switch on my P3. The noise is quite strong, about S7, and shows clearly
on the P3 screen. If I move the P3 about six inches away from the K3 the
noise disappears.
Sent: 23 March 2011 17:09
To: elecraft@mailman.qth.net
Subject: [Elecraft] [K3] Noise from P3
While operating on SSB on 144.225 MHz using the internal K144VX
transverter I am getting broadband noise around that frequency when I
switch on my P3. The noise is quite strong, about S7, and shows clearly
David,
I tried this and found no similar issue.
Bill
K9YEQ
-Original Message-
While operating on SSB on 144.225 MHz using the internal K144VX transverter
I am getting broadband noise around that frequency when I switch on my P3.
The noise is quite strong, about S7, and shows
: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of John Lemay
Sent: Wednesday, March 23, 2011 12:18 PM
To: 'David Pratt'; elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
David
Yes, I do.
Try placing your hand immediately in front
Thank you, Bill, interesting. As the problem has also been reported by
John G4ZTR I wonder whether it could be due to our 50Hz mains supply.
73 de David G4DMP
In a recent message, Bill k9...@live.com writes
David,
I tried this and found no similar issue.
Bill
K9YEQ
-Original
David,
My P3 is on the side of my K3 with the handle. I also have the K144XV.
I'm not able to duplicate what you describe.
Tom
N5GE
On Wed, 23 Mar 2011 17:09:07 +, David Pratt da...@g4dmp.fsnet.co.uk wrote:
While operating on SSB on 144.225 MHz using the internal K144VX
transverter I am
It's audible here only if I put my fingers on the P3 screen and find the
most sensitive spot, but it's never strong. It's completely inaudible
without touching the P3's screen.
Disconnected the 2-meter antenna and touched a short wire to the ANT3
connector and it got very loud, suggesting that
On 3/23/2011 10:09 AM, David Pratt wrote:
Removing the 2 metre antenna also removes the noise.
How far is your 2M antenna from your P3?
A suggestion. Try adding several clamp-on ferrite cores to the power
cable and the BNC, placing them as close to the P3 as practical. These
should be a
]
Sent: Wednesday, March 23, 2011 12:30 PM
To: Bill
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
Thank you, Bill, interesting. As the problem has also been reported by John
G4ZTR I wonder whether it could be due to our 50Hz mains supply.
73 de David G4DMP
In a recent
On 3/23/2011 10:54 AM, Ron D'Eau Claire wrote:
If it's not being picked up by the antenna there must be some other path
into the K144XV perhaps through an open ground between units, etc.
A Pin One Problem on either end of the BNC or power cables (that is, at
the P3 or K3) could couple around
On 3/23/2011 11:47 AM, Bill wrote:
I should not think the mains 50 cycle should matter. It would seem to be
more of a radiation issue. That is what makes me ask about the cabinet
prep.
Yes. And your comment about the importance of scraping the paint is
right on too. If there's paint between
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
On 3/23/2011 11:47 AM, Bill wrote:
I should not think the mains 50 cycle should matter. It would seem to be
more of a radiation issue. That is what makes me ask about the cabinet
prep.
Yes. And your comment about the importance
@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
On 3/23/2011 11:47 AM, Bill wrote:
I should not think the mains 50 cycle should matter. It would seem to
be more of a radiation issue. That is what makes me ask about the
cabinet prep.
Yes. And your comment about the importance
On 3/23/2011 11:56 AM, John Lemay wrote:
It seems to me that the noise is being radiated by the screen itself, and no
amount of cabinet scraping will reduce this.
That's entirely possible -- but it's also possible that the cables are
involved. Many RFI problems have more than one cause, or
j...@audiosystemsgroup.com
Subject: Re: [Elecraft] [K3] Noise from P3
To: elecraft@mailman.qth.net
Date: Wednesday, March 23, 2011, 1:31 PM
On 3/23/2011 10:09 AM, David Pratt
wrote:
Removing the 2 metre antenna also
removes the noise.
How far is your 2M antenna from your P3
March 2011 19:20
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
On 3/23/2011 11:56 AM, John Lemay wrote:
It seems to me that the noise is being radiated by the screen itself, and
no
amount of cabinet scraping will reduce this.
That's entirely possible -- but it's also
On 3/23/2011 1:18 PM, John Lemay wrote:
I think at this stage I should also make it clear that I have a highly
sensitive 2m system with masthead preamplifier, and four eight element yagis
which are at present quite close to ground level.
Does the strength of the noise vary as you rotate the
Yes, I can home in on the noise with great certainty !
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: 23 March 2011 20:23
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] Noise from P3
On 3/23/2011
, 2011 8:18 PM
Subject: Re: [Elecraft] [K3] Noise from P3
I've spent a bit more time investigating this noise, following my initial
response to David.
The noise sounds rather like a buzz saw. It is quite audible on the K3
speaker, it is strong enough to move the S meter, and it's visible
*** Thank you to everyone for their kind help. ***
I am pleased to report that putting a ferrite 'clamp-on' core at each
end of the 12V power lead has completely cured the problem. Because the
cable is quite thin, I managed to wind two turns round each core.
I wonder whether a screened power
Interesting !
I'll try some more ferrite tomorrow .
John
-Original Message-
From: David Pratt [mailto:da...@g4dmp.fsnet.co.uk]
Sent: 23 March 2011 21:31
To: Ken Roberson; John Lemay
Cc: elecraft@mailman.qth.net; j...@audiosystemsgroup.com
Subject: Re: [Elecraft] [K3] Noise from
Hm . . . what about SCOTCHTINT, or somesuch other rf shielding window
film, over the display, between the clear bezel and the chassis?
Brgds,
Dave, N3HE
--
View this message in context:
http://elecraft.365791.n2.nabble.com/K3-Noise-from-P3-tp6201047p6202021.html
Sent from the Elecraft
On 3/23/2011 1:30 PM, John Lemay wrote:
Yes, I can home in on the noise with great certainty !
That indicates that the noise is being radiated by the P3 or something
attached to it, and picked up on your antenna (and not picked up on K3
wiring).
The comments by others that ferrites on the
On Wed, 2011-03-23 at 19:35 -0700, Jim Brown wrote:
On 3/23/2011 1:30 PM, John Lemay wrote:
Yes, I can home in on the noise with great certainty !
That indicates that the noise is being radiated by the P3 or something
attached to it, and picked up on your antenna (and not picked up on K3
In a recent message, Alan Bloom n...@sonic.net writes
The shells of the coax and the RS-232 connectors are grounded directly
to the chassis. Sounds like it must be the power cable.
That being so, Alan, is there any value in supplying screened cable for
the power lead rather than the twin 'bell
On Thu, 2011-03-24 at 04:39 +, David Pratt wrote:
In a recent message, Alan Bloom n...@sonic.net writes
The shells of the coax and the RS-232 connectors are grounded directly
to the chassis. Sounds like it must be the power cable.
That being so, Alan, is there any value in supplying
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