Hi Everyone,
When I could not get the VCO to lock despite changing the number of
turns on the red winding of T5, I got discouraged, and left the assembly
of my K2 in abeyance for a couple of years. However, recently I resumed
work on it.
I started checking voltages and found that line 4V was locked on 8.004
volts.
Today I removed the thermistor board from the RF board and found a fault
on it. The solder connection to one of the resistors looked fine, but
it was not making electrical connection with the end of the resistor.
The problem has now been rectified and the board re-installed. The
voltage at 4V is now 4.0 volts. The VCO is still not locking, probably
because the T5 red winding still has 17 turns on it from earlier
attempts to solve the problem.
Tomorrow, I will carefully read Gary Surrency's email to me, perform his
suggested checks, and then remove one winding from T5 and see how I then
get on with the VCO locking.
73
Kevin
VK3DAP / ZL2DAP
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