> http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_C.pdf
This is an entirely different (and older) modification. Output Mod
Rev C is designed to prevent damage to the right channel of the AF
amp when it is "open circuit" as it is when SPEAKERS=2 with a single
speaker attached.
The modification that Paul is inquiring about is designed to protect
the AF amplifier when the output is short circuited - e.g. connecting
a *mono* plug with SPEAKERS=2 - or in case of overload (a sudden static
"crash" or high level carrier with AGC=OFF) when using low (4 Ohm)
impedance speakers.
The latter modification has never been documented but I assume it
involves adding 2R2 or 2R7 resistors in series with the blocking
capacitor - perhaps replacing L13 and L16 on the KIO3 Audio Board.
73,
... Joe, W4TV
On 3/11/2013 10:41 AM, David G4DMP wrote:
I wouldn't have thought this needed a mod kit, Paul. It only requires
two 470 ohm resistors which the application note states will be supplied
by sending an e-mail if required.
http://www.elecraft.com/K3/mods/AF_Output_Mod_Rev_C.pdf
73 de David G4DMP
In a recent message, Paul Kirley <[email protected]> writes
http://elecraft.365791.n2.nabble.com/K3-speaker-audio-gone-td7561739.htm
l#a7561747
Because I prefer to open my K3 only in low-static months, it's time to
ask about the status of this mod, which hasn't yet appeared on the K3
mod webpage. Will it be available within the next few months?
73, Paul W8TM
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