Les,
50 uV is not a large enough signal to see on a 'scope or RF probe. You
really need 1.4 volts (or whatever is specified in the procedure) of RF
input.
I suggest you build the simple oscillator shown in the Signal Tracing
appendix of the manual. It has good output for that purpose. The
crystal should be at a frequency within your tuning range.
73,
Don W3FPR
On 8/22/2014 3:07 PM, Les Garwood wrote:
Thanks again, Don.
I've been using Elecraft's signal injector; you may know it puts out 50
micro volts on the high setting.
I'll try your suggestions but I think I did part of them already.
BTW, I'm using my Android phone so it's tough to write a lot of detail.
Les
On Aug 22, 2014 11:05 AM, "Don Wilhelm" <[email protected]> wrote:
Les,
You did not mention your test gear nor any information about your setup,
so I have to make some guesses and ask some groundwork questions.
Are you injecting RF from a signal generator to the BNC jack? If so, is
that signal large enough to register on what you are using to determine
signal or no signal ('scope with 10X probe or RF Probe)?
Do you have the jumper installed in J2 of the band board?
Turn the signal generator off, then on while observing the level at band
board J8 pin 8 - you should see a rise in the RF being measured. If not,
the signal level is too low to register on your measurement device.
The Signal Tracing section starting on page 5 of the K1 manual appendix
gives you an orderly sequence for troubleshooting. Where does the signal
level drop below the expected level? That point is just past the point of
failure.
73,
Don W3FPR
On 8/22/2014 1:03 PM, Les Garwood wrote:
Dear Fellows,
I just finished construction of my K1. The receiver stage worked
perfectly
until I finished the transmitter stage. I still get audio hiss and volume
but no signal on any band, AGC on or off, attenuator on or off.
All the voltages and resistances check out except the anode of D9,
according to the manual, is supposed to be > 100k. I'm sure this is an
error, however, since the DC path to ground from that point goes through
three resistors and a choke totalling only about a couple K, which is
what
I measure.
I still get rf out of the VFO, and can trace it through the filter board,
J6, at pins 1,2 and 6, with my scope. However, there is no trace of
signal rf from the antenna on pins 1 or 8 of J7.
I have no rf at the attenuator relay either, at pin 3, or any other.
I can't quite figure out yet how the TR switch circuit works (or doesn't
perhaps) so it's hard to troubleshoot if it is the problem or not.
Needing the filter board in place makes trouble shooting all the harder
too. I wish I had a layout view showing the bottom of the rf board to
help.
As always, any comments welcome and appreciated.
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