Modifications for the Kenwood R-1000



19-07-1998 Kenwood R-1000 muting
Author: Trio-Kenwood Communication, inc.


Service Bulletin no. 805 (7-2-1980)

Mute Circuit:

The R-1000 has a mute circuit four use in combination with a transceiver or transmitter.

The R-1000 RF stage will mute by grounding pin 7 on the remote terminal.
(See Fig 3-9) in the opertors manual.

This information was inadvertantly omitted from the Owners Manual, and will be included in manuals for serial number 0030502 and above.



19-03-2000 R-1000 AGC, AM bandwidth changes
Author: Trio-Kenwood Communication, inc.


Service Bulletin no. 813 (19-2-1980)

AGC

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 reverse) in-line at connector 3 on the RX unit X55-1250-00.

24 HR clock

Contrary to popular rumor, the clock module IS NOYT convertable to 24 hour format.

BWK-1

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 & 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

Installation:

Install as outlined on the reverse side of the instruction. 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.




19-03-2000 R-1000 RF attenuator 10 dB step option
Author: Trio-Kenwood Communication, inc.


Service Bulletin no. 823 (22-4-1980)

The RF Attenuator may be converted from the standard 20 dB step to 10 dB by replacing resistors on the RX unit X55-1250-00.

Replace With Type
R1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18		 No Change
R3 1.2K
1.8K
R7 1.2K
4.7K
15K
1.8K
1.2K
No Change
R16 56ohm
No Change
100 ohm
68 ohm
R13 220 ohm
820 ohm
100 ohm
No Change
R12 56 ohm
R (Radial)
R
A (Axial)
A
R
A
R

A

R
A
A
A
A

R

Note: How to Solder on the PC Board.

  1. Use a LOW POWER PENCIL, 35W or less.
  2. Use rosin cone solder, small diameter.
  3. Do NOT create solder bridges or splotches.
  4. Do NOT overhead or otherwise lift the foil from the board.
  5. Wash exoess flux away with RESH trichlor, and a small flux brush. Neatness counts- It's YOUR radio.