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Figure 117. Connections for the PTO coil L13.
Coil wire connection order is important! The coil is set up with the back end being RF hot. Connect
as shown
above. When connecting L13 to the board, make sure the front end of the coil is connected as
shown. The PTO oscillator circuit has a RF hot end and a RF cold end of L13. If we make sure the RF
"cold" end of L13 is at the front panel, hand capacitance effects on the tuning of the receiver are not
noticeable. There are pads provided for L13, but the above attachment points are a bit closer as the
connections to L13 are a bit of a stretch as it is.
New instructions:
The hardware for the PTO coil now includes a thick nylon nut on the back side and a
thin metal nut on the front side. The pictures in this section show the coil as being glued front and back
with no front nut used. Even with the front nut in place, glue may be useful.
Do not over tighten the
two nuts as the PTO coil form may break!
Old instructions:
The PTO coil with nylon nut will be epoxy glued to the front panel. In preparation
for this mounting, use coarse sandpaper to rough up the front side of the nylon nut and the back side of
the front panel that the PTO will be glued to.
Figure 118. Front side of the PTO coil (prototype chassis) showing epoxy ridge from the front side
Norcal NC2030 v5
12-18-05
Page 94 of 128
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