4SQRP Bayou Jumper 40 Meter CW Transceiver, Assembly & Instruction Manual

Page: 9 / 47

revised 3 Feb 2021 Bayou Jumper revB Assembly Manual page 8 of 46
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Install the BNC jack in its location at the upper left corner of the PCB. Be
sure it is flat and flush against the board and is vertical. Solder only the center
pin at this time.
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Re-install the front panel and make another alignment check. Locate the
“chicken head” pointer knob and install it on the rotary switch’s shaft. You’ll need
a 1.5 mm Allen wrench to tighten the set screw. Check that the pointer will align
with the panel markings for the three switch positions. If all is satisfactory,
remove the knob and panel and set them aside. You may leave the standoffs in
position if you wish.
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Now solder all of the remaining pins of the BNC jack and rotary switch.
The leads of resistors and axial leaded inductors should be bent in a gentle
radius about 0.1” from the body of the part, so that the component body is not
stressed or broken. If you have a bending jig, use it, selecting
0.4” spacing for
all ¼ W resistors and diodes,
0.5” for L4, and 0.6” for L2. The bodies of these
components should rest flush against the board surface when mounted
.
Inductors
There are two molded inductors that look like carbon
composition resistors. Add these next. Be especially
careful when bending the leads of these parts.
Notice the relative sizes in the photo.
The one with the larger inductance (L4 470µH) is the
smaller physical size.
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Ref Value Marking Description
L2 1.0 µH Wide Silver-Brown-Gold-Black-Silver Molded Axial Choke
.6” LS
L4 470 µH Wide Silver-Yellow-Violet-Brown-Silver Molded Axial Choke
.5” LS
L2: 1 µH
L4: 470 µH