[K2] L33 (BFO torrid) & R116 (5.1Mohm 0.125W) mishap

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[K2] L33 (BFO torrid) & R116 (5.1Mohm 0.125W) mishap

michael taylor-3
I had a small mishap with my wire cutters while trimming the L33 (BFO
pre-wound torrid) and R116 (5.1Mohm 1/8 W) resistor's leads. As I went
to trim the fine wire lead of the L33 I accidentally also cut a large
chunk out of one of R116's leads.

I'm wondering if I should try to "patch" R116's lead or admit the
mistake and order a replacement L33 pre-wound torrid and R116
resistor? The problem is since I have trimmed both hair-fine leads of
L33, I'm not certain I can re-solder the leads again in a "do-over" if
I simply tried to replace the one-legged resistor.

-Michael, VE3TIX
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Re: [K2] L33 (BFO torrid) & R116 (5.1Mohm 0.125W) mishap

ne1rd
Michael,

If it was me, and I had a very high resistance part in my
junk box, I'd give it a try. I'm pretty sure that resistor is
there only to provide a mechanical support to this coil
under the board. So, any very, very high resistance part
can do the trick -- if it fits mechanically.

If the leads from the torroid won't reach, you could solder
a short discarded component lead horizontally a cm or so
on each side from the new resistor's lead closer to the end
of the wires. It should be stiff enough to stay in place.

Even if you have to undo one turn on
each side to get the wire long enough to secure it to the
new resistor it is worth a try. When you do the VFO checks
it will be obvious (?) that it did -- or didn't -- work. Given
the variation in these things it sure seems worth a try.
And it wouldn't look goofy like my above suggestion {grin}.

The thing is, if these things above don't work, you've lost
nothing. You can still remove the parts and replace them
with fresh ones from our friends at Elecraft. I'd give it a
try. (I hate to wait on parts!)

Let us know how it worked out.

-- Scott (NE1RD)

michael taylor-3 wrote
I had a small mishap with my wire cutters while trimming the L33 (BFO
pre-wound torrid) and R116 (5.1Mohm 1/8 W) resistor's leads. As I went
to trim the fine wire lead of the L33 I accidentally also cut a large
chunk out of one of R116's leads.

I'm wondering if I should try to "patch" R116's lead or admit the
mistake and order a replacement L33 pre-wound torrid and R116
resistor? The problem is since I have trimmed both hair-fine leads of
L33, I'm not certain I can re-solder the leads again in a "do-over" if
I simply tried to replace the one-legged resistor.

-Michael, VE3TIX
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Re: [K2] L33 (BFO torrid) & R116 (5.1Mohm 0.125W) mishap

Vic K2VCO
In reply to this post by michael taylor-3
michael taylor wrote:

> I had a small mishap with my wire cutters while trimming the L33 (BFO
> pre-wound torrid) and R116 (5.1Mohm 1/8 W) resistor's leads. As I went
> to trim the fine wire lead of the L33 I accidentally also cut a large
> chunk out of one of R116's leads.
>
> I'm wondering if I should try to "patch" R116's lead or admit the
> mistake and order a replacement L33 pre-wound torrid and R116
> resistor? The problem is since I have trimmed both hair-fine leads of
> L33, I'm not certain I can re-solder the leads again in a "do-over" if
> I simply tried to replace the one-legged resistor.

Keep in mind that the ONLY function of R116 is to support L33. So as
long as L33 is connected to the circuit board pads, you will be fine. So
by all means patch R116's lead; it's just there for mechanical reasons.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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Re: [K2] L33 (BFO torrid) & R116 (5.1Mohm 0.125W) mishap

michael taylor-3
On Jan 1, 2008 1:04 AM, Vic K2VCO <[hidden email]> wrote:
>
> Keep in mind that the ONLY function of R116 is to support L33. So as
> long as L33 is connected to the circuit board pads, you will be fine. So
> by all means patch R116's lead; it's just there for mechanical reasons.

Ah ha! I was throw off by the unusual value of R116 - 5.1 Megohms. I'm
not sure why Wayne or whoever would pick that value, rather than say 1
Meg or 10 Meg.

I think I may have a 10 Meg resistor that I can use as a mechanical
support. But I think I'll wait until after I get some sleep before
trying to salvage it.

Happy New Year's.

Thank you,
 Michael VE3TIX
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