Heathkit SB-200 Assembly ManualUse Pictorials 6, 7, 8, and 11 at rear of manual for references, such as terminal strips M and Q.http://f1buy.perso.neuf.fr/SB200/heathkit_sb200_manual.pdf
SK-201 “SOFT KEY” INSTALLATION INSTRUCTIONShttp://www.harbachelectronics.com/pdffiles/sk-201.pdfLast four steps for installation
( ) Connect the BLUE wire from the SK-201 circuit board to the antenna relay jack on the rear panel and solder (along with the 0.02μF capacitor).
1. The BLUE wire is supposed to solder to the capacitor at the antenna relay jack. What side of the cap? Center pin of the connector or the ground side?
Use PICTORIAL 7 for reference.
CENTER conductor of antenna relay jack.
( ) On the terminal strip to the left of terminal strip “Q”, locate the junction of the rectifier diode and the 10KΩ 2W resistor. Connect the RED wire from the SK-201 circuit board to this junction and solder.
( ) Fish the GREEN wire from the SK-201 circuit board under the capacitor going between terminal strip “Q” and the terminal strip to the left, over the wire bundle and through the grommet in front of the SWR bridge assembly.
( ) Rotate the chassis onto its side with the transformer down. Pull the GREEN wire all the way through the grommet so that it reaches one of the terminal lugs where the filament choke is soldered. Solder the GREEN wire to one of the lugs where the filament choke is attached.
2. The green wire goes to the filament choke. That's the core with the green wire wrapped around it correct?
Pictorial 11, found on page 39. Terminal strip M.
( ) Reinstall the tubes and the perforated sheet metal RF shield on the top of the chassis and put the chassis back into the case.
This completes the installation of the SK-201 “Soft Key” module. You may not SEE any difference in the operation of your exciter or amplifier, but you will know that you have reduced the stress on the exciter’s keying relay by many orders of magnitude.