Choke & RFC K2 PCB Markings?

[Fred (FL)]

I'm a bit confused as to the "markings" for 2-terminal
CHOKES, RFC's, and L's - used on the RF BOARD of the
K2.

If you look at the pictorial of the device, printed on
the printed-circuit-card, of for example the RF BOARD
-
it depicts a 2-terminal inductor/resistor looking
devices,
with 3 or 4 bands and the last one being wider and
darker?

What is the WIDER band supposed to represent?  Is it
the TOLERANCE or the first color band?  Very confusing
-
when they tell you to install, say the "RFC1, 100 uH,
(BRN-BLK-BRN)"   The actual 2-terminal inductor, has 4
color bands, the last one is a "GOLD" band.  What is
the WIDE band on the device outline on PCB - supposed
to represent?

Thanks,
Fred N3CSY
K2 #5422

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[Nick Waterman]

Fred (FL) wrote:
> I'm a bit confused as to the "markings" for 2-terminal
> CHOKES, RFC's, and L's - used on the RF BOARD of the
> K2.
[...]
> What is the WIDER band supposed to represent?  Is it
> the TOLERANCE or the first color band?

All of these (Choke, RFC, L) are basically just coils. There is no
positive or negative, there is no polarisation, they can be installed
either way 'round and it shouldn't make any difference which way 'round
you install them.

I installed all of mine in the same orientation as resistors (which are
again unpolarised) - so the bands can be read left-to-right, or
top-to-bottom.

Yes, the extra band (usually gold) is a tolerance, again exactly like
the resistors.

--
"Nosey" Nick Waterman, G7RZQ, K2 #5209.
use Std::Disclaimer;    [hidden email]
Computer Science: solving today's problems tomorrow.
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[Stuart Rohre]

Typically, the extra bands can be a tolerance band of silver or gold.  10
per cent for silver and 5 per cent for gold.   On resistors that have a
fourth color band, that sometimes is a voltage rating, if not a silver or
gold band.

Stuart
K5KVH



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[Mark Bayern-2]

I have never heard of a resistor with a 4th color band for voltage.

Using 4 color bands for the resistance value is quite common -- see
just about any small 1% resistor.  Three bands for the significant
digits and one for the power of 10.

Mark   AD5SS

On 4/18/06, Stuart Rohre <[hidden email]> wrote:

> Typically, the extra bands can be a tolerance band of silver or gold.  10
> per cent for silver and 5 per cent for gold.   On resistors that have a
> fourth color band, that sometimes is a voltage rating, if not a silver or
> gold band.
>
> Stuart
> K5KVH
>
>
>
> _______________________________________________
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>

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