[Elecraft] To Fuse or Not To Fuse...

Fri Mar 12 12:58:00 2004

Hi

One option would be to mount a 5 output RigRunner to the side of the =
battery with double stick foam tape or tie wraps. Then you would have a =
master fuse for the battery and 5 fused outputs for the K1 and any other =
accessories you may need to power. You could also plug in a charger or a =
small solar panel at the same time. You would need to install powerpole =
connectors on everything but the RigRunner comes with a few extra =
connectors. The RigRunner uses the flat automotive fuses available at =
any auto parts store and come in many sizes from 1 to 40 amps.

Don Brown

  ----- Original Message -----=20
  From: Mike Morrow<mailto:[email protected]>=20
  To: Ronald W. Evans<mailto:[email protected]> ; =
[email protected]<mailto:[email protected]>=20
  Sent: Friday, March 12, 2004 11:21 AM
  Subject: Re: [Elecraft] To Fuse or Not To Fuse...

  Ronald Evans wrote:

  >I routinely operate my K1 and K2 from a 12V, 7ah gel cell without =
inline
  >fuses in the power cord.
  >
  >Questions:  Are such fuses advisable?

  Yes, in my opinion, at least as far as the K1 is concerned.

  Some seem to feel that, if there's a series reverse polarity diode in =
the
  power path, a fuse is NOT necessary.  I'll give one example where that =
can
  cause a problem:  Suppose you transmit for a while into an unmatched =
or
  disconnected antenna.  The RF voltage at the final stage can build =
high
  enough to destroy the protective zener diode that's in the output =
circuit.
  If it shorts, then you'll have a high DC current flow that could =
destroy the
  reverse polarity protection diode or the PCB traces in the DC power =
path.  A
  fuse will prevent that, as well as provide protection for any number =
of
  similar power circuit faults.

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