Nishi Musen Kenkyusyo NTS220 User manual

144MHZ SSB/CW Handy Tranceiver (in Eng. ver.04)
N T S 2 2 0
O p e r a t i n g M a n u a l
N I S H I M U S E N K E N K Y U S Y O C O . , L T D
1INTRODUCTION
The NTS220 is a QRP 144MHz SSB/CW Transceiver. Its small size and light weight are
ideal for portable use. The NTS220 has been carefully engineered and manufactured to be
reliable and efficient. If you experience any problems or questions, please contact us so
assistance can be provided.
2SUPPLIED ACCESSORIES
External power connection cable
Connection cable for CW KEY
Connection cable for Handy Microphone Speaker(HM-75 type connection available)
AA batteries (4 pieces)
Warranty
3SPECIFICATIONS
Frequency Range: 144000.00～144999.95KHz
Emission Modes: SSB(USB)、CW(Side tone & Semi-break-in)
RF Power Output: 1W(Max)
Oscillation method: PLL(0.05KHz/Step ＋FUNC key 2.5KHz/Step. Frequency
stability±2.5ppm. Receiver Incremental Tuning.)
Sensitivity: Under 0.15μV(SINAD12dB)
Receiving method: Single superheterodyne
Supply Voltage: 6VDC(4 internal AA alkaline batteries)
Power consumption: RX 80mA(standby - no signal) TX 250～700mA Max.
Aerial Impedance: 50 ohms(SMA)
Operating Temp. Range: -10 °C to +60 °C (+14 °F to +122 °F)
Dimensions: 78W x 27H x 140D mm
Weight: 300g(incl. batteries)
Display Backlight: Display has illuminated backlighting active during incoming
RX signals.

4 Each part name
1 PWR switch
2 PWR LED
3 VOL+ switch
4 RIT+ switch
5 FRQ+ switch
6 SP&MIC jack
7 PTT switch
8 External KEY terminal
9 CW KEY switch
10 SQL switch
11 FRQ- switch
12 RIT- switch
13 VOL- switch
14 ANT connector(SMA)
15 FUNC switch
16 Display
17 Built-in Microphone
18 External power supply jack
19 Built-in speaker
5 ALKALINE BATTERY INSTALLATION
1First remove the battery cover from the
back side of the transceiver. Slide the battery cover,
as shown in the illustration.
2 Install the Alkaline AA cells, paying
particular attention to the correct polarity of the
batteries.
3 Replace the battery cover.
・When the transceiver is to be stored for a long
period of time without use, remove the batteries.
6 EXTERNAL POWER CONNECTIONS
The provided power cable connects to the
Jack(18) on the side. Supply DC6.0 V and install a 1A fuse in the middle of the power
cable to protect the radio from over current situations..
7 Antenna connector (14)
Connect the 50 ohms antenna. DO NOT apply strong forces
to the SMA connector – “finger tight” is perfect. A flexible
type antenna or thin coax 'pig tail' adapter is recommended
when connecting to a SMA connector.
⑭

8RECEIVER OPERATION
a) Basic operation
Press and hold in the PWR switch(1) for one second to
turn to the transceiver ON or OFF.
When the PWR switch and FUNC switch(15) are
pushed at the same time, the frequency becomes an
initial state.(144250.00KHz、RIT+00)
b)Frequency tuning
Push the FRQ+ key(5) or FRQ- key(11) to set the frequency. You can change the operating
frequency in 0.05KHz steps. When either FRQ+ key or FRQ- key are pushed for a long time, the
frequency will change continuously. In addition, when you push the FRQ+ key (or FRQ- key )
and FUNC switch(15) are pushed at the same time, you can change the frequency step size to
2.5 kHz.
・At the upper and lower limit frequency
If you push FRQ- key (11) at 144000.00KHz, the frequency is changed to 144999.95KHz. If you
push FRQ+ key (5) at 144999.95KHz, the frequency is changed to 144000.00KHz.
c) ADJUSTING THE AUDIO VOLUME
LEVEL
Push the VOL+ key(3) or VOL- key(13)
to set a comfortable listening level. When
VOL+ key or VOL- key is pushed for a long
time, audio volume level will change
continuously. When the OL+ key or VOL-
key is pushed, the audio volume level is displayed (01 to 70 hexadecimal) to the left of the
frequency. If other switches are pushed, the display returns to a frequency designation.
① ② ③ ⑤
⑮ ⑬ ⑪
Audio Volume Level

d)RIT (Receiver Incremental Tuning)
Adjust the 'receive offset' higher or lower with RIT+
key(4) or RIT- key(12). This will not change the TX
frequency – only the RX frequency will change.
The RX frequency steps in 0.05KHz increments
with a 15 step maximum range(±0.75KHz).
e) ADJUSTING THE SQUELCH
Push SQL switch(10) to adjust the squelch
from level 0 to 9.
The initial setting is 0.
While the squelch circuit is active the
display backlight disappears.
Frequency（KHz） RIT
④
⑫ ⑩
Squelch level

9TRANSMITTER OPERATION
a)SSB TRANSMISSION
Press the PTT switch(7) , and speak into the
microphone to transmit a SSB signal. When the PTT
switch is pushed, the PWR LED(2) turns on. An
external microphone can be used by using the provided
converter cable to attach to the radio.
The transmit mode is displayed on the lower right of
the display. The transmitter Power is displayed with an analog meter ranging from levels 0
to 9.
CAUTION: When you transmit, please be
sure to connect an antenna or dummy
load.
b)CW TRANSMISSION
Press the CW KEY(9) to transmit a CW signal(Semi-break-in).
You can also transmit with an external
telegraph key by using the provided cable to
connect with the External KEY terminal(8) .
NOTE : CW receive offset in 'CW mode' is possible. To begin the process, first set the RIT
receive offset to +00. Then press the FRQ+ key(5) or FRQ- key(11) to find the transmitting
station. Adjustment is made in 1KHz steps. Finally, adjust the "beat sound" by using RIT+
key(4) or RIT- key(12).
② ⑦
⑧ ⑩
Transmit mode
Anlog meter Transmitter power
Transmit mode

NISHI MUSEN KENKYUSYO CO.,LTD.
since 1986
Leven Sannomiya Building Room#205, 2-1-29 Kumoidori, Chuou-Ku
Kobe City, Hyogo Prefecture 651-0096
Japan
Phone: [phone] Fax: [phone]
[email protected].jp
We at Nishi Musen Kenkyuujyo Co.,Ltd. are highly skilled in developing various radio
instruments.
Especially we have good techniques to design analog circuits for radio.
Our company has been developing and manufacturing several radio instruments for
the uses of business customer and Amateur (Ham) Radio hobbyist.
Additionally we are also going to develop and to manufacture some wireless tools,
such as "Wireless Terminals" and "Low Radio Power Devices" which no license is
required to operate.
Your custom orders are welcome.
[List of our products]
* These products were discontinued.
1. Instruments for the uses of amateur radio hobbyist
(a) 3.5, 50MHz All Mode Transceiver 10W PSN mode SSB, FM and CW
(b) 144MHz SSB Handheld Transceiver 1W
(c) 430MHz SSB Handheld Transceiver 1W
(d)1200mhZ Up-Converter 0.1W
(e) 144/430MHz FM Transceiver 1-45W (Mobile and Handheld PLL)
2. Instruments for the uses of business customer
(a) 60-900MHz Band FM Transceiver 1-10W PLL
(b) Data Transmission Wireless Device
(c) 1.9GHz Linear Amplifier 8W (for the PHS base station)
3. Others
(a) RF-ID Tag. Reader/Writer module for the Tag.
(b) Underground detector: Equipment for detecting any objects, which buried in the ground.
(c) Special SG instrument (Multiple Channels, High Stability)
(d) Receiver/Transmitter unit for IR Laser (50W)

(e) Wireless units, Ultrasonic sensor, IR sensor