From: jsb{at}digistar.com
Subject: Re: [drakelist] L4-PS R12 burned - .825 ohm 2W resistor on pin 6 of
 cable harness


jsb{at}digistar.com made an utterence to the drakelist gang
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On Mon, 6 Dec 2004, Garey Barrell wrote:

> The 0.82 ohm resistor is actually a wirewound "flameproof" resistor.
> The wirewound is identified by the "double width" first color band.
> The value is also not particularly critical, since in this application
> it is really nothing more than a HV fuse that will explode on overload,
> clearing the circuit and protecting the power supply.  NTE offers
> flameproof resistors in their replacement line, but anything under 1 ohm
> is difficult to find.  A 1 ohm value is fine in the L-4B.  The metal or
> ceramic oxide resistors are a second choice, at best.  I don't know what
> they do under extreme overload.

Good to hear that NTE makes these resistors.  I hope to get to the local
parts store on Wednesday to buy a few replacements.

The resistor that blew was blue in color and each end was fluted out, no
wide color bands as the value of the resistor was stamped on the side of
it.  But I will look for the wirewound variety first and then carbon.  I
think the one that was in there probably was the slower type as it didn't
pop and quit working - I heard a pop and then noticed some "light" coming
out from underneath the L4 PS through the ventilation holes, all while I
was transmitting.  The resistor currently has a value of 400K ohms - hi


Thanks for the help - will keep you updated.


vy 73 Jason N1SU
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