[Elecraft] Fw: keyer problem etc

Fri Feb 13 13:51:15 2004

----- Original Message -----=20
From: Rich Haendel=20
To: [email protected]=20
Sent: Friday, February 13, 2004 12:16 PM
Subject: keyer problem etc

Re my  K2, S/N 4023.=20

I finished building my K2 and have some problems.   I can receive on 20 =
meters, the sensitivity seems just fine.  I haven't tried the =
sensitivity on other bands as I only have a 20 M dipole up.=20

On page 45  Audio amplifier and tone generator test. I have set up the =
tone generator and can hear and control the tones as per the =
instructions.  For the keyer test on the second column, of page 45,  =
I've set up the keyer using PDL n  and checked for dots and dashes with =
my iambic paddle.  I do not hear any sidetones, nor dots and dashes.   I =
have reloaded all the default parameters as per the instructions in the =
advanced settings, no change.  The keyer speed knob on the front panel =
operate correctly. =20

I did not check this step earlier as I had no keyer until today.  I have =
checked the voltages from the keyer jack. they are at nominally 5 VDC =
and both sides dots and dashed go to zero independently when the key =
levers are pressed.  I have traced the key lines to U1 on the control =
board, pins 29 and 30.  They seem to be OK.  Speaking about U1, =
measuring the voltages on each pin,  I  found two variances from the =
voltages on Page 15 of the manual.  Pin 25 is supposed to be 0 VDC, but =
it is 5 VDC,  and pin 33 is supposed to be 5 VDC but it is nearly 0 VDC =
( there are narrow positive pulses on this line)  . =20

Other items,=20
The TUNE button on the front panel does not turn on the transmitter.  I =
get NO power output.  I also get no power output when I try and key the =
K2 with the keyer. =20
Any ideas?

Rich Haendel W3ACO

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