Installing the K3 AGC Mod (SMD)

[Roy Morris-6]

I am getting ready to install the SMD AGC mods.  The LED chip replacing R101 has two little green dots on it.  Can someone give me the orientation of this chip.  I don't know which side is the cathode.  Thanks,  Roy Morris  W4WFB
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[AC7AC]

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[srife]

    I guess I haven't kept up too closely. Are we doing mods to the K3
already?  Is this a factory sanctioned mod?


Stan
W5EWA
Houston, TX


----- Original Message -----
From: "Ron D'Eau Claire" <[hidden email]>
To: "'Roy Morris'" <[hidden email]>; <[hidden email]>
Sent: Saturday, April 05, 2008 4:15 PM
Subject: RE: [Elecraft] Installing the K3 AGC Mod (SMD)


If you have a DMM with a diode check feature, just probe the LED terminals.
When you have the positive lead on the anode the DMM will indicate a forward
biased diode junction and the LED will light up!

It won't work with modern DMMs in "ohms" scale because they limit the
current too much to avoid damaging parts, but "diode check" works FB.

Ron AC7AC

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Roy Morris
Sent: Saturday, April 05, 2008 1:12 PM
To: [hidden email]
Subject: [Elecraft] Installing the K3 AGC Mod (SMD)


I am getting ready to install the SMD AGC mods.  The LED chip replacing R101
has two little green dots on it.  Can someone give me the orientation of
this chip.  I don't know which side is the cathode.  Thanks,  Roy Morris
W4WFB _______________________________________________
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[dj7mgq]

Hi Stan,

>    I guess I haven't kept up too closely. Are we doing mods to the K3
> already?  Is this a factory sanctioned mod?

Yes, yes and yes....

See <http://www.elecraft.com/K3/k3_app_notes.htm>

vy 73 de toby
--
DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz)
K2 #885
K2/100 #3248
K3/100 #67
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[David Woolley (E.L)]

Ron D'Eau Claire wrote:
> If you have a DMM with a diode check feature, just probe the LED terminals.
> When you have the positive lead on the anode the DMM will indicate a forward
> biased diode junction and the LED will light up!

LEDs have higher forward voltages (much higher for blue ones) than
ordinary diodes, so some meters may light the diode, but show full scale
and some may not even light the diode.

My meter will light up to at least green, but shows an off scale drop
for even red.

--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
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