J-F,
The AGC Threshold setting between 3.74 and 3.8 volts should work just
fine - do not exceed 3.8 volts. If set too low, the CAL S LO and CAL
S-HI settings get out of hand.
Your CAL S-LO setting of 182 is not unusual, but your CAL S-HI setting
is lower than usual - and that is the reason for your overly active S-meter.
If you have a signal source that will produce a 50 mV output (-73 dBm)
use that to set CAL S-HI when tuned to that signal with the preamp on.
Set CAL S-HI for an S-9 reading on the K2 display.
If you do not have an S-9 signal source, first set the RF Gain fully CCW
and adjust CAL S-HI for a full scale reading on the Bargraph. In the
next step, do not go any higher than that setting.
Lastly try a CAL S-HI setting between 18 and 25 and see what the S-meter
readings produce with signals on the air.
When you are satisfied with the S-meter activity, stop and enjoy your K2.
Your voltage readings are within the range of normalcy.
73,
Don W3FPR
On 1/28/2014 5:14 PM, VA2SS wrote:
Hi,
I had a few problems in the past (builder's mistakes hi!) with my K2.
Today, I suspect that these problem affect the AGC on my K2.... when setting
up the CAL HI and LO, my actuel readings are CAL HI set at 013 and CAL LO
set at 184 when U2 PIN5 is set to 3.8V.
I also found she using the K2 that the AGC a little bit too generous or
"exited"... hi !!
I found an old post of Don giving many values with a K2 used for the the
test. I set the U2 PIN5 at 3.74 like in the post and do a few measurement
with 3.74V value.
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