Pto Frequency Alignment; Pto Tuning For The 20M Version (2.941 To 3.006 Mhz); Figure 123. L13 Pto Tuning Coil As Mounted. Remove Turns Off The End Simply By Pulling On The Wire - NORCAL NC2030 Manual

The peak at this point may not be in the 1 to 1.5v range. There are gain adjustment resistors that will get
added in either the mixer or the LO amp section or both to bring the detected voltage up to the needed
range.

PTO Frequency Alignment

Having found the LO filter peak above, it is time to tune the PTO. It is likely that the PTO is not on the
right frequency at this point, but rather a bit low in frequency.
Press the AFA button and hold it down. It should cycle through "E" "L" "F" "ER" "LR" "FR" and then
repeat the sequence again at a slower speed. Stop at "L", the "long" frequency readout mode. The AFA
should send the entire frequency down to the 1 Hz granularity. 14.060 MHz would be read out as "14 R
060 R 000

Figure 123. L13 PTO tuning coil as mounted. Remove turns off the end simply by pulling on the wire.

PTO tuning for the 20m version (2.941 to 3.006 MHz)

With the PTO tuned so that the tuning knob is flush with the front panel (all the way in), press the AFA
button and read the entire frequency using the "L" frequency mode. It will likely start out around 13.9
MHz rather than the desired target of 14.065 MHz when the tuning knob is all the way in. Let me
repeat this again, on the 20m version, the tuning knob all the way in should correspond to roughly
14.065 MHz. Since the PTO was wound with too many turns, the frequency should be to low (LO
frequency = 11.059 MHz + PTO). The PTO is tuned to the correct frequency simply by removing turns.
Warning: Adding the cover to the receiver will increase the final LO frequency by about 2 KHz.
Norcal NC2030 v5 12-18-05
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