= = = On Aug 22, 2:49 pm, Denno wrote:
-
- Thanks for the responses! There was a lot of good
- information and references in the replies.
- I especially liked the stormwise site.
- Funny how I can google for hours and still miss some
- of the best web sites.
-
- I had read in some other articles on the net that a
- longer ferrite bar can be made from two shorter bars
- by using epoxy to glue them together. I have my doubts
- about this. I realize that the inductance may not know
- the difference and just "jump" across the glue joint,
- but does it really? Perhaps winding the bar so the coil
- spans the glue junction would compensate for the
- separation between the bars? Do you think gluing two
- bars together would truly behave as one long ferrite bar?
-
- Thanks,
- Denno
.
.
.. .

Denno,

Building "Joined 'Twin' Ferrite Rods" :
Making a One Longer Ferrite Rod from Two
http://groups.yahoo.com/group/Shortw.../message/14369

Joining Two Ferrite Rods" by 'gluing' them together
is a little more complex than that . . .

CRITICAL - They should be the same Type Ferrite
Materal and Size of Ferrite Bars. { Twins }

First - The Ends that are to be joined together need
to be Polished and Flatened so that the two end
Surfaces can make full and complete contact with
each other. Throughly Clean the Two Ends of the
Ferrite Rods.

Second - Rig an Assembly Form (Jig) to position the
Two Ferrite Rod so that the Ends Tough Flat and the
Two Ferrite Rods form a concurrent line and separate
the Rod Ends by a 1/4" so that they can be "Bonded"

Third - Use a very small amount {1/2 Drop} of "SuperGlue"
to "Bond" the Two Ends of the Ferrite Rods. Press the
Ends together firmly for 5~ 10 Seconds.

Fourth - Prepare a small amount of Clear Epoxy to use
to cover the outside of the Two Joined Ferrite Rods.
Cover the Outer Surface of the Ferrite Rods with a Thin
Coat of Epoxy all around for about an Inch and let the
Epoxy set and harden.
* Repeat the Epoxy covering for about 3/4".
* Again repeat the Epoxy covering for about 1/2".
Three Thin Coat of Epoxy thin at the edges and
thicker in the middle.

Note - Clear Epoxy not the 'colored' kind that may
have some metalic fillers in it.

Fifth - Carefully remove the "Joined 'Twin' Ferrite Rods"
from the Fixture and handle and store them very carefully.

TIP - Have all your 'other' Antenna Rod Work done first
and building the "Joined 'Twin' Ferrite Rods" is the last
work step before the Final Assembly Process.


hope this helps - iane ~ RHF {pomkia}
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