[Elecraft] K4 Front Panel Phones Jack

[Mark Musick]

Hi Roy,
This would be better posted on the Elecraft-K4 at groups.io . That is where all the issues for the K4 are being documented by Bob, N6TV. Bob is one of the K4 testers and has documented K4 setup etc. Wayne also monitors the K4 reflector closely. You may also find something in the files section of the K4 reflector where a lot of questions and answers reside.
I've not looked at the K4 manual as to using the front panel headphone jack, but if what you are describing is true it will not be fixed by a firmware update. It is a hardware issue. You will have to provide a resistor with a path to ground for your AKG 240 headphones to work.

73,
Mark, WB9CIF
K4D Serial #743

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Roy Morris, Jr. via Elecraft
Sent: Monday, August 1, 2022 11:43
To: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: [Elecraft] K4 Front Panel Phones Jack

When I plug my AKG K240 headphones into the front panel jack, my K4D produces static when transmitting.  Removing the headphones plug, my transmitted audio is normal.  If I use the rear jack with these same headphones, there is no problem with my transmitted audio.The Elecraft K4 operating manual (rev 17, March 10,2022) states some headphones will not work with the front panel phones jack unless a resistor is added in parallel.  The front phones jack depends on the transducer providing a resistance path to ground when inserted.I hope this can be fixed in a future firmware update.  Roy Morris  W4WFB ______________________________________________________________
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