KL505
HF 10m Linear Amplifier
Specifications:
Operation Frequency: 10m Amateur Band, (1.8-30MHz with LPF)
Modulation Types: SSB,CW,AM, FM, (All narrowband modes)
Transistor: 4x RM SD1446 Transistor
Max I/P Current: 35A
Power Supply: 13.8VDC+/- 1V 50A
Input Fuse (Internal): 3x12A (5x20mm Fast Blow Glass Fuse)
Input RF Power: 1-10W max (All modes)
Output RF Power: 230W max
Maximum bypass power (Amplifier off): 50W max
Input VSWR: 1.1—1.5:1
Output VSWR Maximum: 2.5:1
Ver 1.0 Jan. 2020
WARNING: Before using this product please read carefully
all of the information in this manual or at least the quick start guide!!! To
avoid damage or incorrect operation this is extremely important!!!
Quick Start Guide:
A more complete guide to the installation is featured later
1. Connect the RTX input connector to transceiver
with 50 Ohm patch cable
2. Connect the ANT Output of the Amplifier to SWR
Bridge / Wattmeter (If required), and then the Antenna (50 Ohm load Impedance)
3. Connect the Amplifier DC power Cable to a suitable 13.8VDC (± 1V) 50A Power Supply or Auto
Battery. Pay attention to the correct polarity
4. Make sure that the amplifier is switched off
5. Adjust the Transceivers RF output power to 5W
(10W max) if it is capable of more than 10W output
6. Switch on the Amplifier and start operating
7. Check that the antenna VSWR is acceptable with
the amplifier in use. Any large increase in VSWR
indicates that the Antenna is not suitable for the
power being used. Operation should be halted
immediately to avoid damage to the Amplifier /
Radio / ATU etc.
Front / Rear Panel Description
Front Panel
1. Receive Pre-Amplifier ON / OFF Switch
2. Amplifier ON / OFF Switch
3. Input Attenuator 6 position, (For output power adjustment).
4. AM / SSB Switch
5. Pre Amplifier ON LED
6. Amplifier ON LED
7. TX indicator LED
Rear Panel
1. RTX SO239 RF input connector
2. DC Input power connector. (Polarity is marked on the supplied mat-
ing connector)
3. ANT RF Output SO239 Socket to Antenna
Installation:
Unpack the amplifier from it’s shipping carton and inspect for any signs of damage. The
amplifier should be installed (either fixed or mobile installation), in a place that allows
good ventilation and provides a suitable base to support it. Failure to allow for reasonable
ventilation will cause the amplifier to overheat and damage may occur. A short 50 Ohm
patch lead should be used to connect the amplifiers RTX SO239 input [ connector to the
output, (Antenna Socket) of the drive Radio. This length of this cable is not critical but
should be of good quality and be kept as short as practically possible. The ANT output ]
connector of the amplifier should then be connected to antenna being used. (If an external
VSWR/Power meter is to be used the amplifier should be connected to the input and then
the antenna to the output, This order of connection is very important. Check also that the
Antenna is suitably rated for the power output level. (Antenna VSWR should not change
much from low to high power). The antenna should be tuned before connecting the
power amplifier or with the amplifier switched OFF! .
In SSB mode the front panel switch ^ should be set to SSB. This adds a short delay to
the release time of the RTX relays so that pauses in speech do not cause the RTX relay to
drop out. In AM or FM mode the SSB delay switch should be set to AM.
The amplifier must be connected via the input power connector \ to a suitable power
supply of the correct voltage output and sufficient current rating. The output should be
13.6 / 13.8V DC but the amplifier may be connected to a supply from 12V to 14V DC
without damage. The current rating of the power supply must be at least 50A continuous.
Be aware that the current rating must be greater still if the drive radio is also connected to
the same power supply, although this is not generally advised.
The voltage output and current rating are very important for low voltage (12V) RF transistors as voltage sag, (poor load regulation) or insufficient current capability can drastically reduce the output power or cause distortion. If full output is not seen then the first
thing to check is that the voltage remains above 12.5V at full load. Anything less indicates the power supply is not suitable for the amplifier at full output.
The cross sectional area of the cables used to connect the amplifier to the PSU should not
be less than 10mm² or 7 AWG. They should also be kept as short as practicably possible
to avoid voltage drop due to ohmic losses. This is less of a problem in a fixed installation
where the power supply may be placed close to the amplifier.
For a mobile installation the leads should not exceed a length of 3m and they should be
connected directly to the auto battery. An additional fuse may also be connected inline to
provide protection in case of cable short circuit to chassis ground from the amplifier to
the battery.
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