Kristinn,
I had the exact same problem. I replaced the regulator with one that
operates at 8.0 VDC and the AGC adjusted correctly. I don't know if they
received a batch of bad chips, but I used one that I had on hand, not one
from Elecraft.
Good luck.
Best,
DW Holtman
WB7SSN
----- Original Message -----
From: "TF3KX" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, May 11, 2008 6:25 PM
Subject: [Elecraft] K2: Low 8V, and adjusting AGC and S-meter
Hi:
My K2 #6425 was ordered in February and is now fully operational, with
almost all measurements and checks within limits. The only issue is the
output of the 8V regulator, which is at 7.56V (5.5% down from the nominal
8V). If I am right, this low voltage is the cause for...
a) AGC threshold adjustment: U2 pin 5 voltage only goes up to 3.62V, not
3.80V;
b) S-meter adjustment: Can never get S-meter LED below #2 or above #9 to
turn on.
I had to order some spare parts from Elecraft, and to be safe I asked them
also to send me a tested replacement for the 8V regulator - which is on
the
way.
My questions are...
- Wouldn't the low 8V level be the cause of the above symptoms (a) and
(b)?
- Any reason I should or should not replace that 8V regulator, anyway?
73 - Kristinn, TF3KX
--
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