Bob,
Putting a large speaker magnet near any tuned circuit creates a large
magnetic field that can affect the tuned circuit. The effect of your large
speaker is common upon many radios. This even affects toroid circuits such
as those in the K2.
-Stuart
K5KVH
_
Fraser,
I would also be interested in a solution to magnetic field sensitivity in my
K2/100. I found that a Radio Shack Optimus speaker placed within 8 inches
of my K2/100 caused distortion on both transmit and receive. I'm not
technically astute enough to call this "phase noise", I just thought
A soft steel cover might do the needed K2 shielding without the expense of
Mu Metal. There are also mu metal type foils that are self adhesive which
could glue to existing panels for increased magnetic field shielding.
Stuart
K5KVH
___
Elecraft maili
ginal Message -
From: "Stephen W. Kercel" <[EMAIL PROTECTED]>
To:
Subject: Re: [Elecraft] Re: magnetic fields and phase noise?
Mu metal is expensive, difficult to find, hard to work with if you can
find
it, and if subjected to mechanical shock, it
What about only changing the plates with normal materials like YaComWood's
do?
I dont know if there would be any improvment?
Adi
- Original Message -
From: "Stephen W. Kercel" <[EMAIL PROTECTED]>
To:
Sent: Sunday, March 20, 2005 10:32 PM
Subject: Re: [Elecraft] Re
I've seen several mentions of mu metal in this discussion. I offer a few
thoughts for what they are worth.
Some years back, when I worked in the Electromagnetic Compatibility Group
at Oak Ridge National Laboratory, we occasionally used mu-metal. The idea
is that it directly suppresses magnetic
Maggie, K3XS wrote:
"If I were having that problem, I'd be thinking about shielding the
*source*...because it would likely affect other equipment in my shack."
==
Yes, indeed, the source is the HV xfmr in the amp. No other equipment in
the shack is affected by it, including any other tran
Earl W Cunningham wrote:
It has been suggested that mu-metal shielding might alleviate the
problem. I'm considering making mu-metal bottom and side covers for my
K2.
If I were having that problem, I'd be thinking about shielding the
*source*...because it would likely affect other equipment i
That dedicated 220 VAC line is likely not all that dedicated, unless
you have absolutely separate 220 VAC service coming into your shack.
Under typical home circumstances, the 110 VAC is simply on one side of
the 220 VAC line. So your 110 shares a buss with the 220 VAC.
LIkewise, two separat
Bruce, NM5B wrote:
"I'm beginning to wonder if the noise source is conducted via the power
lines vs. radiated."
==
Others suggested that it stopped because the K2/100 was in a different
room on an AC circuit other than the amp.
Well, the amp is on a dedicated 220 VAC line and the K2/100 i
N2TK, Tony wrote:
My K2/100 sits on top of my TS950SDX. If I go above about 30-50W with the K2
on 80 and 160M I have to reset my router. Was using a Belkin router. Now
using a Netgear wireless router. Both cutout.
Don't get me started about routers and 160/80 meters! I have an inverted L
wh
Bruce, NM5B wrote:
"Here's a wild guess to throw in the mix. Since you have tried shielding
and separation to eliminate or minimize the presumed radiated noise path,
I'm beginning to wonder if the noise source is conducted via the power
lines vs. radiated."
==
I have never tried shielding
March 19, 2005 9:27 AM
Subject: [Elecraft] Re: magnetic fields and phase noise?
> Fraser, G4BJM wrote:
>
> "Interesting Earl, the non exhaustive tests I've done indicate that it
> is
> not due to magnetic fields."
> --
> When I first told Elecraft about
N2TK, Tony wrote:
My K2/100 sits on top of my TS950SDX. If I go above about 30-50W with the K2
on 80 and 160M I have to reset my router. Was using a Belkin router. Now
using a Netgear wireless router. Both cutout. This doesn't happen all the
time - maybe 50% of the time. Been wrapping ferrite on
urday, March 19, 2005 9:28 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; elecraft@mailman.qth.net
Subject: [Elecraft] Re: magnetic fields and phase noise?
Fraser, G4BJM wrote:
"Interesting Earl, the non exhaustive tests I've done indicate that it is
not due to magnetic fields."
Fraser, G4BJM wrote:
"Interesting Earl, the non exhaustive tests I've done indicate that it is
not due to magnetic fields."
--
When I first told Elecraft about this problem, they sent me the new
shield for the KPA100, which didn't help. Then they sent a mod kit that
had to do with reducin
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