Service BulletinAmateur Radio Division

Subject: R-1000 - AGC, AM bandwidth changesDate: February 19, 1980

To shorten the AM AGC time constant, C2, the AGC capacitor may be changed from the original 4.7uF, or simply delete C2 by clipping out the 4.7uF as supplied. Access to this component is by removing the top case. On early models, C2 is located behind the MODE switch, and on later models, is located on the RX unit as C138 adjacent to connector 13.
AM Bandwidth optional wiring
If you desire substituting the AM 6KHz filter in favor of the 12KHz for AM WIDE, and the 2.7KHz filter for AM narrow, install the optional BWK-1 connector kit (see below) in-line at connector 3 on the RX unit X55-1250-00.

24 HR clock
Contrary to popular rumor, the clock module IS NOT convertable to 24 hour format.

The BWK-1 is an optional AGC and Narrow bandwidth kit for early production R-1000 receivers. It allows using the SSB 2.7KHz filter for AM narrow, and includes a 1uF cap for shortening the AGC time constant. This kit includes instruction to fabricate and install the connector and to locate and replace the cap. This does require some technical ability.

This kit is for serial numbers before: 0030001-0051600 and 0060001-0060400 cap change and before serial numbers 010xxxx for selectivity. Later production has the 1uF cap, and internally selectable AM bandwidth.

Contents of this kit:
1. Diode
1. Male connector 3 pin
1. Female connector 3 pin
2. Female connector pins
1. 1uF @ 16V (or greater) capacitor
1. instruction sheet

Additional Requirement
45 Watt or smaller soldering pencil.
60/40 rosin core solder
small cutting plier
#2 Philips screwdriver

Install as outlined below. Disconnect power before opening the R-1000.

Connector fabrication READ BEFORE PROCEEDING.
  1. Cut the leads on the diode to approximately 3mm or 1/8 inch, and save the cut leads.
  2. Lay the connectors diode, leads and female connectors out just as pictured. Be sure the index on the diode and each connector is as shown:
  3. Solder the diode and leads the Female connector pins.
  4. Insert the Female connector pins in the Female connector so the metal tabs lock into the plastic connector.
  5. Solder the diode and leads to the Male connector.
Fabrication is complete.

©1980 Kenwood