Circuit Description - Kenwood NX-800H Service Manual

3.
• How to enter the password with the microphone key-
pad;
If you press a key while "CLONE LOCK" is displayed,
the number that was pressed is displayed on the trans-
ceiver. Each press of the key shifts the display in order
to the left. When you enter the password and press
the [ ] key, "CLONE MODE" is displayed if the en-
tered password is correct. If the password is incorrect,
"CLONE LOCK" is redisplayed.
• How to enter the password with the [ ] and [ ] keys;
If the [ ] and [ ] keys is pressed while "CLONE LOCK"
is displayed, number (0 to 9) are displayed flashing.
When you press the [ ] key, the currently selected num-
ber is determined. If you press the [ ] key after entering
the password in this procedure, "CLONE MODE" is
displayed if the entered password is correct. If the pass-
word is incorrect, "CLONE LOCK" is redisplayed.
4. Power on the target transceiver.
5. Connect the cloning cable (Part No. E30-3382-05) to the
modular microphone jacks on the source and target.
6. Press the [ ] key on the source while the source displays
"CLONE MODE" The data of the source is sent to the
target. While the target is receiving the data, "PRO-
GRAM" is displayed. When cloning of data is completed,
the source displays "END", and the target automatically
operates in the User mode. The target can then be oper-
ated by the same program as the source.
1. Overview
NX-800H (K3) is a UHF Mobile transceiver designed to
operate in the frequency range of 380 to 400MHz (in user
mode). The unit consists of receiver, transmitter, phase-
locked loop (PLL) frequency synthesizer, base band parts,
power supply, and control circuits.
ANT
ANT
SW
PA
AMP
REALIGNMENT

CIRCUIT DESCRIPTION

TX/RX: 380~400MHz
1st MIX MCF
RF
AMP
58.05MHz
19.2MHz
VCTCXO
321.95~
341.95MHz
TX
AMP
380~400MHz
Fig. 1 Frequency confi guration
7. The other target can be continuously cloned. When
the [ ] key on the source is pressed while the source
displays "END", the source displays "CLONE MODE".
Carry out the operation in step 4 to 6. Can not be cloned
if the overwrite password is programmed to the target.
Note:
Only the same models can be cloned together.
Cloning cable
(E30-3382-05)
8. Firmware Version Information
Press and hold the [ ] key while turning the transceiver
power ON and then keep pressing and holding the [ ] key,
the fi rmware version information appears on the LCD.
2. Frequency Confi guration
The receiver is a double-conversion super heterodyne
using first intermediate frequency (IF) of 58.05MHz and
second IF of 450kHz. Incoming signals from the antenna
are mixed with the local signal from the PLL circuit to pro-
duce the first IF of 58.05MHz. This is then mixed with
the 57.6MHz second local oscillator output to produce the
450kHz second IF. The transmit signal frequency is gener-
ated by the PLL VCO, and modulated by the signal from the
DSP. It is then amplifi ed and fed to the antenna.
CF
450kHz
MIX AF
IF AMP AMP
x3
57.6MHz
PLL MIC
VCO AMP
NX-800H
Fig. 2
SP
MIC
7