[Elecraft] K1 RF Board - Resistance Checks
Joseph M. Durnal
joseph.durnal at gmail.com
Wed Jan 30 14:03:30 EST 2008
I'm working on the RF board and I've reached the first chance to do
resistance checks in the manual and I have some questions and one
major concern.
There are a few checks that when I first touch the meter to it will
flash a few ohms and within a second go to the desired value.
For example (from PG 29):
With the meters negitave lead on the ground near J7,
P1 pin 8 reads about 150 ohms (it varies slightly from test to test)
for less than a second then goes over 100k ohms
U3 pin 3 shows 46 with the VOM set to 200K. I really don't know what
that means, I'm thinking that is 46,000 ohms, which is less than 200k
U3 pin 5 is shows 20 with the VOM set to 20K, again, I'm assuming that
is 20k, which is greater than 10k
Now for my major concern,
U4 pin 4 reads only 0.4 ohms - I think I have a problem here, but I
have no idea what it could be, the manual said it should be > 50k.
The schematic seems to show it as a ground.
I'm glad I started with a K1 - I don't think I was really ready for
it. I can't even figure out how to read my VOM (although I'm going to
go practice on some known value resistors while waiting for replies to
this e-mail). Still, when I get this radio to work, I'm sure going to
enjoy making QSOs. Then comes the K3 but I also hope to build a K2
down the road as well.
Thanks & 73 de Joseph Durnal NE3R
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