KOHJINSHA KP-1 User manual

Instruction Manual
DIGITAL
POWER METER
KP-1
Rev1.1 18. July. 2017

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Thank you for purchasing KP-1.
In addition to the conventional power meter
features KP-1 has some new features that are
large cross meter, digital display, and protection
circuit to prevent your antenna and/or amplifier
from getting trouble.
Please read this manual carefully before you start
using KP-1. We would like you to use KP-1 as long
as possible.
■Features
●KP-1 is SWR/POWER meter using current
transformer to pick up RF of ranging from
1.8MHz to 30MHz.
●KP-1 has a large analog cross meter and 7
segment blue LEDs that help your easy reading
power & SWR.
●KP-1 has four positions of power range. You can
choose a proper range for your output power.
●Digital display can show not only power but
SWR.
●You can read PEP with pressing the PEP button
when you operate SSB. You may not lose your
voice with this function. You can setup hold
time as you like.
●Protection circuit works when the SWR
becomes higher than the level you set. You can
set this threshold level between SWR 1.4 and
2.5.
Table of Contents
Front Panel・・・・・・・・・・・・・・3
Rear Panel・・・・・・・・・・・・・・・4
Preparation before using・・・・・・・・・5
■Operation
FWD Power measurement・・・・・・・・・5
REF Power measurement・・・・・・・・・5
SWR measurement・・・・・・・・・・・・5
PEP power measurement ・・・・・・・・・5
Effective power measurement・・・・・・・5
■Setting up parameters
P1 mode・・・・・・・・・・・・・・・・6
P2 mode・・・・・・・・・・・・・・・・6
P3 mode・・・・・・・・・・・・・・・・6
P4 mode・・・・・・・・・・・・・・・・6
P5 mode・・・・・・・・・・・・・・・・6
P6 mode・・・・・・・・・・・・・・・・6
P7 mode・・・・・・・・・・・・・・・・7
Specifications・・・・・・・・・・・・・・8

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■ Functional Overview- Front Panel
1. Cross Meter
You can read FWD/ REF power and SWR with
this analog meter. The crossing point of needles
shows the SWR value.
2. Digital Display
You can select functions with the buttons below
the display. When the function is selected, the
button shines blue.
3. FWD Button
Digital display shows FWD power when this
button is pressed.
4. REF Button
Digital display shows REF power when this
button is pressed.
5. SWR Button
Digital display shows SWR when this button is
pressed.
6. PEP Button
This switch toggles between average power and
PEP power. When it is showing PEP, it lights
blue.
7. DEL Button
Digital display shows the power going into your
antenna FWD-(minus)REF when this button is
pressed.
8. PROTECT Lamp
When the SWR becomes higher than the value
you set up, it is activated. When activated, the
connection between 12 TX GND and 13 RELAY
IN is disconnected inside of KP-1.
9. POWER Switch
This switch is used to turn on the KP-1.
The button shines red when the power supply is
on.
10. Range Select
You need to choose the proper range in order
for the analog meter needles not to jump off
scale. You don't have to think about power
range for digital display.

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■Rear Panel
11. Power jack
For DC12V adaptor plug.
12. TX GND Terminal
To be connected with TRX TX GND.
13. RELAY Terminal
Connect with RELAY IN of your amplifier.
12 and 13 are normally connected inside of
KP-1.
When the SWR accidentally gets higher than
the threshold value, KP-1 automatically cuts off
the line to protect your amplifier and/or
antenna. (Go to page 6 for how to set up)
14. RF IN Connector
SO-239 to connect with your TRX
15. RF OUT Connector
SO-239 to connect your antenna

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■Preparation Before Start Using
●Connect DC adaptor supplied with KP-1. You
can use your own DC power supply, however
please don't apply more than 16 volts. We
strongly recommend using our products.
●Connect IN connector to your TRX with 50ohm
coax cable with SO239 on both sides.
Connect OUT connector to your ANT with 50
ohm coax cable with SO239 on both sides.
■Operation
Select the power range the right most
(FWD10KW/REF2500W) just in case.
●Measuring FWD Power
1. Press 3 FWD button
2. For SSB Operation
Press 6 PEP button.
For AM, FM, or CW operation you don't have
to press this button.
3. If you use analog meter, select the proper
range for your transmitting power.
●Measuring REF Power
1. Press 4 REF button
2. For SSB Operation
Press 6 PEP button.
For AM, FM, or CW operation you don't have
to pres this button.
3. If you use analog meter, select the proper
range for your transmitting power.
●Measuring SWR
1. Press 5 SWR button.
2. Digital display shows SWR calculated by CPU.
The crossing point of needles also shows the
SWR.
●PEP Power Measurement
KP-1 can show average power when you
operate AM, FM, or CW that has carrier.
Because SSB signals don't have carrier, the
signals change its level according to voice evel.
For this reason you need to use PEP meter to
read the power. KP-1 has a circuit that read
peak value of the power when you press 6 PEP
button. Needles swing to peak value, too.
Factory setting is 0.3second hold time. You can
set up this hold time by yourself. See P7 mode.
●Measuring Effective Power
Pressing 7 DEL button let KP-1 to calculate the
effective power. Effective power is the power
that deducts REF power from FWD power.

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■ How to set up parameters
There are SIX user programmable parameters
from P1 to P7 except P5.
●How to get to setup mode
You are looking at [P- 1] after you turned on
power while pressing both SWR and DEL.
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FWD button works as UP
REF button works as DOWN
DEL button works as Enter
←Press DEL
Here is an example of your setting up P3.
Let the KP-1 setup mode as described first part of
this page.
Now you are looking at
P- 1
Pressing FWD button increments the number,
which selects mode. Pressing FWD twice should
make 1 to 3 like below.
P- 3
You can choose values in P3 mode with FWD and
REF buttons.
← Pressing FWD twice
←P3 Mode
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● P1 Mode (Protection)
0: Lock Mode
The relay control connection between TRX and
amplifier is cut off when SWR accidentally gets
higher than the threshold level. The SWR value
can be set up by yourself. If you select this
mode, KP-1 will keep the cut off status until
you turn off the power. We strongly
recommend you to choose this mode.
1: Automatic recovery Mode
If you choose this mode, the KP-1 gets back
to normal when the SWR becomes normal for
some reason.
●P2 Mode (Threshold)
You can select the threshold value to activate
the protection circuit. SWR value can be set
between 1.4 and 2.5 with every 0.1 step.
FWD and REF button work 0.1 up or down
respectively. You need to press DEL to set.
● P3 Mode (Brightness)
Brightness of LED display can be set with this
mode. Pressing DEL button once changes the
display as [P3-88]. Then you can choose P3
parameters with FWD and REF buttons.
FWD button makes brighter. REF button
makes darker. SWR button resets as factory
setup. You need to press DEL to set.
● P4 Mode (Hold Time)
You can select between 100ms and 1000ms
with every 100ms step.
Pressing FWD button makes 100ms up.
Pressing REF button makes 100ms down.
You need to press DEL to set.
● P5 Mode (Version)
This mode shows the software version with
four digit number. Pressing DEL button brings
back to normal.

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● P6 Mode (Factory Setup)
If you want to reset to factory setup, choose 0
with FWD or REF button, and then press DEL. If
you press DEL when 1 was shown, the
operation is canceled.
Factory setup values
SWR protection: Lock mode
0
SWR protection threshold value
2.0
FWD and REF offset value
0
A/D calibrate mode voltage display
6 times(0 to 30V)
peak hold time
300ms
● P7 Mode (For Technician)
This mode isn't used usually.
Under the calibration mode you can select 1 or
6. 6 means multiply 6 times when displaying
A/D input voltage.
Operation Tips
FWD button : up
REF button : down
DEL button : Select/Determine
Power off : Cancel

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■ Specification
Frequency Range 1.8MHz to 30MHz
Measuring Power Range 10W to 10KW
Power Range Selection FWD 500W/1KW/5KW/10KW
REF 125W/250W/1250W/2500W
Accuracy +-7% at full scale of each range
Minimum power required to measure SWR approximate 8W
Insertion Loss Less than 0.1dB
Input/Output Impedance 50ohm
Input/Output Connectors SO239
Dimensions 229W X 136H X 115D(excluding external protrusions )
Weight Approx. 1.7Kg
Supplied Accessories Users manual, DC12V adaptor

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