PO Box 296 • TRACYTON, WA 98393-0296 • (360) 692-7750
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NW Series QRP CW Transceiver
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ZM-2 Antenna Tuning Unit (ATU)
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Complete view of ZM-2 with all internal components installed and wired except for L1. L1 wiring.
L1 DETAIL. L1 DETAIL.
LED - DIODE - 1K RESISTOR detail L2 DETAIL.
Notice that all of the leads are tinned before installation. This may seem to be a basic concept but I have learned from experience that people don't tin leads of torroids prior to installation.

When my father worked at Northern Radio he would bring home torroids for me to wind. Part of the job was to tin the leads. We did this with a solder pot. That was a nice way to do it. I, like most people, do not have a solder pot. But it is very easy to tin leads on torroids.

It is easy to do, just scrape a little of the varnish off with a knife or exacto. You just need a section of bare wire not a sparkling clean wire. Now, start at that cleaned spot and using lots of solder wet out the lead. You should supply a constant flow of new solder to the meltpoint during the process.

Here is a video of how to tin leads:
56K version
200K version
56K version download
200K version download

LED DETAIL diagram.
WIRING DETAIL
Complete less the last common connection from L1 and C1.
L2 DETAIL.
Notice that one lead of the LINK winding (black wire) is marked with white-out. This is the end that connects to the black banana post.
L1 DETAIL. L1 DETAIL.
Notice that one lead of the LINK winding (black wire) is marked with white-out. This is the end that connects to the black banana post.
Ladder Grabber / Coax Grabber
   










PO Box 296
Tracyton, WA 98393-0296

(360) 692-7750
Hours: (WEST COAST USA)
9:00 am - 6:00 pm (PST)

Eastern US call between 12:00 pm thru 9:00 pm YOUR time.

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