stages of your transmitter. We recommend that you get them ready for installation before assembling the Driver and Final stages. If you prefer to proceed with those stages, winding coils as you go, that's fine, too, as long as you realize that all coil making details are provided in this section.
The wire used for L1, 6, 10, and 12 is the smaller gauge enameled wire supplied with your kit. We give you plenty but if you mess up, you can get a whole 50' spool of it from Radio Shack
❒76. Winding L1 and L6 RF chokes (two identical units ): Examine the two cylindrical ferrite cores provided in the kit.Notice that there are six holes at either end of these cylinder shaped units, arranged in two groups of three. Cut 6" of bus wire and following the drawing, thread the wire, pulling each turn gently tight. Tin each end with solder by holding your soldering iron and solder on the wire ends until the enamel insulation melts away and the copper wire underneath coats nicely with solder. Tin all the way up to the ferrite core body. Your finished RF chokes should look like this: Do not install either part yet.
❒77. Winding L10 and L12: Locate the two small black ferrite beads provided in the kit. Cut 2" of enameled wire and following the drawing, thread 3 turns through the bead hole, pulling each turn "gently tight." Tin each end with solder. Tin all the way up to the ferrite core body. Your finished bead chokes should look like this: Do not install either part yet.
❒78. Winding L2 and L7: Use the heavy gauge tinned bus wire in your kit for these coils. Wind these coils on the threads of the provided 5/16"X20 bolt to assure perfect forming of the coils. (You wondered what that big bolt was for - didn't you!) Both coils are 11/2 turns. They appear to be 2 turns if viewed from the top. They will fit neatly into the PC board without any excessive bending or stretching.
❒ 79. Winding L3 and L4: Use the same wire and | 6 hole ferrite | |
procedure as used above for these coils. Each coil | core | |
is 2 1/2 turns and will appear to be 3 turns if | ||
| ||
viewed from the top. |
| |
| enameled wire | |
| tin ends | |
| 3 turns through | |
| center | |
| enameled wire | |
| tin ends |
FT146 • 13
