Fixing K2 Toroid Coils

[Joe Jones-5]

Contemplating the building of a K2 this winter (fall) for use aboard my
narrow boat afloat on the UK inland waterway system.

The intention will be to slightly 'ruggedise' the K2, conformal coating
the PCBs against moisture etc.

I know that the manual states that upright toroids should not be glued
into place but .....

This K2 will be operating within 2m of a single cylinder diesel engine
that has a pronounced 'thump'/low frequency vibration - crockery left on
the draining board some 5m forward of the engine is liable to make its
way back into the sink!.

So, bearing in mind that I only wish to secure the edge of the toroids
that are upright and touching the PCB, not coat the whole toroid in
adhesive, (and change the inductance) what adhesive would be best ...?

        Two part epoxy?

        Superglue?

        Silicone Sealant?

Many thanks

73's

Joe Jones
Narrowboat 'Will Crooks'
The Llangollen Canal N. Wales UK


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[Dan Barker]

I had to look, and others might want to also.

Dan

http://www.auluk.freeserve.co.uk/boats/willcrooks.htm

<snip>

Joe Jones
Narrowboat 'Will Crooks'
The Llangollen Canal N. Wales UK

</snip>
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[Mike S-8]

At 10:02 AM 3/15/2005, Joe Jones wrote...
>So, bearing in mind that I only wish to secure the edge of the toroids that are upright and touching the PCB, not coat the whole toroid in adhesive, (and change the inductance) what adhesive would be best ...?

Beeswax is the traditional material for fixing coils, and has the benefit of being removable using moderate heat.

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[Michael Bower N4NMR]

Now that is a cool boat.

(sorry, this starting to go OT but so cool. <grin>)

Joe, you should plan this trip for the summer with a special QSL for
contacting you on the boat.  That is so neat.

Michael N4NMR

(Also, Joe, please contact me direct.  I tried e-mail and your address
doesn't work for me. (sorry for the OT).)

Thanks.

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Dan Barker
> Sent: Tuesday, March 15, 2005 10:16 AM
> To: Elecraft
> Subject: RE: [Elecraft] Fixing K2 Toroid Coils
>
> I had to look, and others might want to also.
>
> Dan
>
> http://www.auluk.freeserve.co.uk/boats/willcrooks.htm
>
> <snip>
>
> Joe Jones
> Narrowboat 'Will Crooks'
> The Llangollen Canal N. Wales UK
>
> </snip>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
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>
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>

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[Steven Pituch]

Hi Joe,
What about a little bit of hot melt glue?  That way its reversible.

Regards,
Steve, W2MY/5
http://users.ev1.net/~spituch/, Corpus Christi, TX, ELl7
QRP/ARCI 8351, FPQRP 1025, NJQRP 25, QRP-L 269, FISTS 3150, ARS 142, NEQRP
281, NWQRP ??, 10-10 61720, NORCAL 691, K2 #402

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[Vic K2VCO]

Joe Jones wrote:

> This K2 will be operating within 2m of a single cylinder diesel engine that
> has a pronounced 'thump'/low frequency vibration - crockery left on the
> draining board some 5m forward of the engine is liable to make its way back
> into the sink!.

My feeling is that due to the low mass of the toroids, you will not need to do
this, especially since it's a thump and not a buzz.   But...

> Two part epoxy?

I wouldn't.  Too permanent.

> Superglue?

Difficult to use since there will be very little contact area between the wires
and the board.  Also might be more permanent than you want.

> Silicone Sealant?

ONLY if you can get the kind that doesn't emit acetic acid when it cures!  The
regular stuff can be quite corrosive.

Again, I wouldn't do this.

--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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