David,
If the voltage is over 0.6 volts, and is applied to the base of a
transistor (assuming the emitter is grounded), the transistor will
conduct. So my answer it less than 0.6 volts. OTOH, if the voltage is
less than 0.3 volts, you will not be able to make diode forward
conduction tests
avid Christ [mailto:radio...@mchsi.com]
Sent: Monday, February 21, 2011 2:15 PM
To: Ron D'Eau Claire; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 RF Board Resistance Checks
What is the maximum safe voltage? It must be less than 1.5 v as that
is what the Simpson and Triplett VOMs use in th
What is the maximum safe voltage? It must be less than 1.5 v as that
is what the Simpson and Triplett VOMs use in their lower ranges, but
how much less?
David K0LUM
At 3:47 PM -0800 2/20/11, Ron D'Eau Claire wrote:
>
>
>I trust you are using a DMM and not a VOM (like the old Simpsons, etc. -
>
n...@mailman.qth.net] On Behalf Of Al Gold
Sent: Sunday, February 20, 2011 2:38 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K2 RF Board Resistance Checks
Hi All,
I have a partially built K2 circa serial number 5000 and have completed
Assembly Stage II of the RF Board. All of the resistanc
Al,
The first thing to try is reversing your meter leads. Often ohmmeters
use a higher voltage which can make some solid state devices conduct.
Is the Control Board plugged into the RF Board? If so, remove it and
remeasure.
Is U8 oriented correctly? How about Q18 and Q19?
Check the values
Hi All,
I have a partially built K2 circa serial number 5000 and have completed
Assembly Stage II of the RF Board. All of the resistance numbers are fine
with the exception of U6 Pin 8 which reads 42.5 ohms and should be greater
than 100 ohms. I have checked everything on the board visually for
I also found pins 29 and 30 (dot/dash) on U6 on the Control Board to have
higher than spec resistance, 96.7k and 96.5k respectively. They should be
70-90k.
Weird.
Steve, KC8QVO
--
View this message in context:
http://elecraft.365791.n2.nabble.com/K2-RF-Board-resistance-checks-not-in-spec-tp
Steve,
Those resistance readings are too low, and you will have to find the cause.
What I believe is happening is that the low resistance on the paddle
connections is triggering the circuits to go into a transmit state - and
if that happens, the buttons do not work nor will the encoder change
f
Here are my out-of-spec measurements. Any ideas?
R1 = 96.4k
R2 = 96.5k
Both should be >1M. Everthing else in the list checks out (well above the
lower spec limit).
At this point the rig powers up and gives me the 201 message, switches to
ELECrAFt, then 7100.00c but the buttons and knobs don't w
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