Chuck,
I use Bose QC25 active noise cancelling headsets. They are very comfortable to
wear for hours in a contest, much more comfortable than any “DX headset” I have
tried. They are better mechanical quality than their predecessor the QC-15 and
they fold to a smaller package for travelling.
I own or have tried them all. For high level of isolation plus
non-fatiguing full fidelity sound, go for the Beyerdynamic DT770M. They
are significantly more isolating than the other phones mentioned.
Barry N1EU
On Fri, Jun 17, 2016 at 4:07 PM, Charles Yahrling
wrote:
On 19-6-2016 4:24, Paul Christensen wrote:
After checking this evening, apparently Elecraft doesn't post
schematics of their amplifier. It would be an interesting exercise
comparing notes.
I suggest you contact Elecraft directly.
We broke down two KPA500's during the 2016 CQWW 160 on its PTT
>"The KPA does have diodes, but I don't know why the KPA diodes seem to make it
>and others don't. Maybe not stressed as bad switching into an open load, which
>might be the real culprit that folks don't want to admit to."
The KPA500 has substantially less field operating time compared with the
Ditto on the Sony MDR-7506. Have been using them for quite a while. Not sure
why they were my choice but generally I do quite a bit of research before
buying.Regards,Jim/k2hn
_
Topband Reflector Archives - http://www.contesting.com/_topband
I have experience with various Alphas including my current 8410. Their
relays *are* loud. Noise cancelling headsets can take that way down.
As to going to diodes to get rid of relay clang, that is another matter.
Though some say they never have had those diodes go bad in their Alpha,
others seem
Chuck -
I’ve been very pleased with Heil ProSets for both CW and SSB.
If you can, borrow the recommended models to see how you like them.
What’s “best” is always going to be subjective just because there are so many
variables.
Communications frequency response vs full range.
Over the ear or
Some headphone can isolate noise very well. I like the Sennheiser HD280 , it
provide 36db isolation, but the best one I have is the MC5 from Etymotic ear
plug that can reach 42 db isolation.
73'
JC
N4IS
_
Topband Reflector Archives - http://www.contesting.com/_topband
I have a pair of Sony noise cancelling phones.
Once you try NC phones, you will never go
back to conventional ones. Now if we could
just get someone to make a set with a microphone.
But you asked about CW, so that doesn't matter.
There is an issue with RF getting into them,
so they might not be
I like my QC-15 noise cancelling headphones! Worth
the money and they DO cancel-out fan noise from the
K3 and my KW amp. I don't have any clacking
relays when I key, so I can't comment on that. I use
an adapter for the 1/8" plug on the QC's.
73,
Charlie, N0TT
On Fri, 17 Jun 2016 16:07:33
com>
To: Topband@contesting.com
Sent: Friday, June 17, 2016 3:07 PM
Subject: Topband: best headphones for cw
Looking for tips for headphone types for K3, CW only, so need 1/4 inch
stereo jack.
Object is to isolate from ambient noise in the shack, such as relay clatter
from 1K-FA amp when
Looking for tips for headphone types for K3, CW only, so need 1/4 inch
stereo jack.
Object is to isolate from ambient noise in the shack, such as relay clatter
from 1K-FA amp when keying.
Been using a cheap set that came with Yamaha keyboard - I like how they
attenuate hi freq band noise, but
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