Having been reading all of the post concerning speaker buzzing and vibration.
I have just received my KX3 kit and spent alot of time examining and getting the
specification for the speaker then proceeded with the assembly.
A little history about myself:
I work in the aviation industry (roughly 30 years), I do instrument
repair work (electronic and mechanical)
most of my work is mostly for Cessna citation jets (owners and pilots
can be very picky)
I have been messing with electronics for about 45 years
I have completed assembly and have made the following observation:
1) Quality control by the manufacture
(not sure on there inspection process, I have checked the cone hight
with a straight edge
like done in the assembly manual for the LCD hight check)
2) VFO shield touching rear of speaker
this causes excessive case vibration, can be cured by placing a piece
of rubber
(like what is used as the speaker gasket) between VFO shield and rear
of speaker
(adhesive back stuck to VFO shield before installation and tightening
of VFO encoder)
3) RX EQ set improperly
cut 50Hz to -16, cut 100Hz to -4, 400Hz to 0, 800Hz to +1, 1600Hz to
+4, 2400Hz to 0 and 3200Hz to 0
(this helps compensate for speaker frequency curve and cuts the bass
out that will cause vibration
and distortion, if would like to boost frequency for CW operation boost
400Hz and 800Hz by +4)
4) Kit packaging
(piece of thin cardstock taped to front of speaker to keep the cone
from becoming damaged
by other parts in the bag/box during shipping)
I hope this can help you as I do this for living everyday.
73, Michael - N8NOC
K1-4 #3046
K3/10 #6596
KX3 #1573
All kits
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
