Matthew,
You reading of the schematic is correct - the voltage at U2 pin 5 is the
result of a voltage divider network - nothing less, nothing more. If
you have a problem here, one or more of the resistors involved is wrong,
or the voltage from the 8 volt regulator is not correct.
The RF Gain control is one of those resistors, so be certain it is set
to the full clockwise position.
73,
Don W3FPR
Matthew Denson wrote:
Hi All,
I am building my K2 and have reached the initial checkout steps before building
the receiver.
On page 48 of my manual (Rev G if that matters) the instructions say to "Adjust R1
for a reading of 3.80...."
On my K2 the way it is right now the range of voltages I get by changing R1 is
2.1-3.28Vdc. Hmmm?
I looked at the schematic on the way to work today (I'm still there) and it doesn't look like there are that many variables here. It is a simple voltage divider of the 8v regulated voltage to ground as far as I can see and it seems like the max voltage should be 1/2 of 8V when R1 is completely shorted out. I haven't checked the 8V source cause I haven't been back home.
Maybe extra useless info - I don't know how the internal volt meter works but
it is reading out correctly (that is I get the same reading as my DMM where I
have made identical measurements) so I assume that the 5V regulator is working
right.
Any thoughts on which points to check? Is my reading of the schematic too
simplistic?
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
