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Author Topic: harbach sk-201 soft key  (Read 2550 times)
AE7VA
Member

Posts: 39




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« on: November 24, 2012, 07:22:47 PM »

1. The blue wire is supposed to solder to the capacitor ar the antenna relay jack.  What side of the cap?  Center pin of the connector or the ground side?  2.  The green wire goes to the filament choke.  That's the core with the green wire wrapped around it correct? Amp is a Heathkit SB-200.
« Last Edit: November 24, 2012, 07:44:48 PM by AE7VA » Logged
KA5N
Member

Posts: 4380




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« Reply #1 on: November 25, 2012, 03:07:43 AM »

The blue wire goes to the inner pin of the connector (one side of the capacitor is
connected to this pin and the other side goes to ground  i.e. chassis).
The green wire goes to one side of the filament transformer and is connected to the
terminal strip (either terminal i.e. whichever side the wire will reach.  This is on the
INPUT side of the bifilar choke.  The other side of the choke will have RF on it when
transmitting.  The wire on the choke is enameled solid wire and the enamel might be
green or brown.  The input side of the choke has a .02 cap to ground on each wire.
The directions I have for the hookup is about five years old and Harbach may have
made  some changes.  The soft key should work well for years if assembled correctly
and connected correctly. 
Good Luck
Allen KA5N
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W9GB
Member

Posts: 2656




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« Reply #2 on: November 25, 2012, 04:20:46 AM »

Heathkit SB-200 Assembly Manual
Use 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 INSTRUCTIONS
http://www.harbachelectronics.com/pdffiles/sk-201.pdf

Last 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).
Quote
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.
Quote
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.
« Last Edit: November 25, 2012, 04:43:50 AM by W9GB » Logged
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