[Elecraft] K1-4 - Can't find S-meter zero point

[Don Wilhelm]

Enzo,

You most likely have a soldering problem or an incorrectly placed 
component.  Component failures are rare unless they were damaged from 
static when handling.
Take a look at the RF Board Schematic sheet 1.  To the right of and 
below the "AGC" label on the left side you will see the components 
associated with the AGC.  You can check the no signal voltages shown 
there as an assist in finding the failure.  Make certain D2 is oriented 
correctly, and that Q1 and Q2 are inserted in the correct holes.
It is also possible that Q1 was damaged by static when you inserted it - 
the 2N7000 FETs are static sensitive.

73,
Don W3FPR

On 4/1/2012 5:05 AM, iw7dmh wrote:
> Good morning,
>
> I'm building a new K1-4 (sn. 3091) and I have completed the RF-Board part I.
> My building experience il reported in my association forum
> http://www.arilecce.it/index.php?option=com_kunena&func=view&catid=18&id=399&limit=6&limitstart=18&Itemid=94
> http://www.arilecce.it/index.php?option=com_kunena&func=view&catid=18&id=399&limit=6&limitstart=18&Itemid=94
>
> It seems everything is working well as I have successfully completed
> receiver alignment procedure.
> Now I'm going to find S-meter zero point following the steps described on
> page 53 of manual.
> After disconnecting the antenna, the S-meter still indicate a full scale
> signal (all bars are on). This happen for any value of Lxx and I'm wondering
> if something in my test is wrong or this problem hides a mistake in my
> building procedure.
> I also found a current consumption (on receiving) of about 35 mA that is a
> bit lower than the expected 55mA. Could it be another problem?
> I hope you can help me.
>
> Best regards.
>
> 73', IW7DMH
> Enzo
>
>