Hi
I am constructing a K2, serial #5669 and having a problem.
Input voltage 13.2 VDC
Alignment test Part II Page 60 manual
4 Mhz Osc Cal worked fine. freq was 12098.81
PLL Ref Osc Range Test
Also OK Ref high freq 12098.78 ref low freq 12084.95 range 13.83
VCO Test Here I have problems.
If I use the frequency counter probe connected to P6 and TP3 before
using CAL FCTR as described in step 6, right column page 60, I get a
zero reading although the reading from to to time switches between 0
and .08. If I remove the probe from TP3 and reconnect to TP 3 get a
reading of around 28 Mhz which rapidly changes down to 00000.06. If
I was reading voltage I would tempted to suspect a discharging
capacitor which I was measuring.
I did the following:
Checked solder joints and proper location, value of, capacitors 30,
71, 72, 73, and 74.
D 21, 22, 23, 24, 25, and 26
L30 (reheated the connection of L30)
Installation of T5 (toroid was constructed
by Mychael Morovich ) spacing of wire appears to be correct
Checked the wires for T5. Zero Ohm between point 3 and 4 also zero
ohm points 1 and 2.
Measured resistance between 2 and 4 as well as 1 and 3. Both readings
give 334.9 ohm, T5 mounted on circuit board as described in manual.
VCO alignment
I went ahead and checked the VCO alignment. When reading the voltage
between ground and left sided of R30 I get a voltage reading of 8 VDC.
When I turn the slug of L30, nothing happens the voltage does not
change.
Does anyone have any idea as to what I can do the elevate the problem?
Your help is very much appreciated.
Have a nice day, 73's Hank WA9QJH
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