I just installed the first toroid, RFC14, in my K2 kit. After
winding it, I sprayed it with conformal coating, and just before
installing it I put a small dab of RTV3145 (non-corrosive) silicone seal
on the end next to the PC board and then soldered it in place.
So I turn the page in
Ron,
I suggest that you indeed do that. Actually on RFC14 it will likely
make little difference because the exact inductance is not critical, but
once the RTV hardens, you will have a bear of a time getting it off
should it ever need replacement. Do not use any fixatives on any more
of
Thanks Don,
I've received a few helpful responses already, which I
appreciate. I could do without the RTV, except I like it at RFC14
because its jammed into a tight space, and as you mentioned, its a RF
choke which wouldn't be critical.
For a very long time conformal coating has
Ron,
Forget the LCR meter with the K2 kit - other than to evaluate the
effects of various fixatives for toroids.
Wind the toroids with the number of turns specified and all will be OK.
As far as conformal coating, again, it makes repair or rework a pain -
but if you insist ...
What I can say
Thanks Don,
good point on the LCR meter, it measures values at 1KHz. The
remaining coils are being installed as per the manual.
I service avionics for living, the better gear has conformal coated
boards. The coating is very thin, applied as an aerosol, and hasn't
been a problem for
Reminds me of a story that I heard years ago while on an assignment in
England.
Seems that the Rolls Royce company didn't have an automatic transmission
in their cars. Since automatic transmissions were the up-and-coming
thing they decided that they needed one to offer in the Roolls Royce.
Hi Jim,
I've worked on aircraft for over 30 years and know what engineers can
do :-) There are many airworthiness directives issued after the
engineers have finished their work. I'd better not get something
started, as I really do appreciate the work of the engineers. More
field experience
standing on their leads.
73,
Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ron VE8RT
Sent: Saturday, July 02, 2011 6:48 PM
To: d...@w3fpr.com
Cc: Elecraft
Subject: Re: [Elecraft] securing toroids in K2, why
And then there's the Armstrong approach to engineering exhibited in the
American Packard V12 of the 1930's.The big V12 engine had so much torque one
could leave the transmission in high gear and start from a dead stop with no
strain. Many owners never shifted gears.
I do second-guess engineers at
U don't need all those adhesive for all toroids. 73 Johnny
Sent from my iPhone 4
R Thompson ve...@xplornet.com 於 2011年7月3日 上午9:02 寫道：
I just installed the first toroid, RFC14, in my K2 kit. After
winding it, I sprayed it with conformal coating, and just before
installing it I put a
Hi Jim
Good story! I think that was a few years ago. Rolls-Royce acquired a
license to produce the HydraMatic in 1952! I remember 1952 well, as
that was the year we got our first TV, The last ones on the block to
do so.
73,
Rick Dettinger K7MW
Reminds me of a story that I
Ron,
Not diminishing your field experience, but speaking only from my
experience with the K2 ...
Consider in the case of the K2, the engineer's decisions have been
scrubbed by first the Field Testers - ranging from experienced builders
(including other engineers) to those who are building
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