Modification Of The Antenna - Kenwood TKR-751 Modification Information

2 MODIFICATION OF THE ANTENNA

This section describes how to modify the antenna to
connect it to the antenna connector for transmission and
reception located on the TKR-750/850/751/851.
It allows to use as one antenna base by sharing an
external antenna connector for both transmitting and
receiving.
You must turn the power OFF before antenna
modification.
Follow the procedures below to modify the antenna.
1. Remove the rear side top panel.
Remove 6 screws (N33-3006-45, 3 mm diameter,
black) and pull the panel up.
2. Move location of C92 and C160 on the Final unit (B/2)
for TK750/751.
Move location of C81 and C160 on the Final unit (B/2)
for TK850/851.
3. Remove the front side top panel.
Remove 6 screws (N33-3006-45, 3 mm diameter,
black) and pull the panel up.
4. Remove the antenna cable.
4-1. Remove the receive cable from the CN18 of
the TX-RX unit (A/2).
5
4-2. Remove 2 screws (N33-2606-46, 2.6 mm
diameter, gold) on the BNC connector fixed to the
rear panel and pull the ANTENNA CABLE
backward.
5. Cut the coaxial cable of the ANTENNA CABLE at the
BNC connector side and remove the insulated part to
perform soldering on the board.
6. Connect the ANTENNA CABLE to the board.
6-1. Solder the cut surface of the coaxial cable
center pin to "RX" and the shield of cable to "E".
Modification Information (MOD)
CN18
Version: 1.02 USA