[Elecraft] Inoperable S-Meter

[Richard Carter]

Don
I thought the numbers looked high, but the regulator is not adjustable.  I
measured it again and found the 5v regulator high too.  The batteries in my
voltmeter are low, causing the readings to look high.  Here they are again
with a fresh battery.

    U2-1     3.7v 
    U2-2     3.7v 
    U2-3     3.6v 
    U2-4     0v 
    U2-5     3.8V
    U2-6     3.8v 
    U2-7     3.8v 
    U2-8     8.0v 
    Q12-E    7.8v
    Q12-B    3.66v
    Q12-C    3.60v

Thanks for your time
Rich - KE1EV


-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at earthlink.net] 
Sent: Saturday, February 18, 2006 12:27 PM
To: recarter at adelphia.net; Elecraft at mailman.qth.net
Subject: RE: [Elecraft] Inoperable S-Meter

Rich,

It would seem your problem extends beyond the S-meter.  For starters, I
don't like the 9.0 volts that you report on U2-8, that is the voltage rail
direct from the 8 volt regulator, so forget about the S-meter for the moment
and start by measuring the voltage regulator U4.  Once that voltage is
within range (8 volts +/- 10%) you can re-check the AGC Threshold setting
and see if the S-meter works.

The 8R voltage is also quite high, but the regulator may be the root cause
of all your problems - fix the regulator problem first.

73,
Don W3FPR

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Richard Carter
> Sent: Saturday, February 18, 2006 12:03 PM
> To: Elecraft at mailman.qth.net; 'Gary Surrency'
> Subject: [Elecraft] Inoperable S-Meter
>
>
> I've finished my K2, and everything seems to work just fine except the 
> S-Meter. I don't think the AGC is working either. My analog skills are 
> somewhat limited, so I'm hoping that someone might advise me.  I've 
> copied elecraft support too, but if someone out there has suggestions, 
> I'd appreciate the help.  I have a scope and can take measurements.
>
> I've verified that the X1 crystal is working.  Voltages on U1 look good.
> Voltages on U2 look low by about 2v.  I think I have a signal to D1.
>
> Voltages are as follows
>
>    U2-1     4.1v
>     U2-2     4.1v
>     U2-3     4.1v
>     U2-4     0v
>     U2-6     3.9v
>     U2-7     3.9v
>     U2-8     9.0v
>     Q12-E    8.9v
>     Q12-B    3.8v
>     Q12-C    4.0v
>
> Thanks in advance
> Regards
> Rich - KE1EV
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