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Contact Details
Peter Miles
Northam, Western Australia
QRZ Page: VK6YSF
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TOKYO
HY-POWER HL-90L 70cm AMPLIFIER Tokyo
Hy-Power HL-90L 70cm amplifier produces 90 watts with 1 - 5 watts of drive.
Modes include FM, SSB and CW.
Below
are the detailed technical specifications and features for the Tokyo
Hy-Power HL-90L
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General
Specification
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Details
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Type
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Solid-state
UHF Linear Amplifier
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Bands
Covered
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430–440
MHz (70 cm amateur band)
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Modes
Supported
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SSB,
CW, FM, AM (low duty)
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Cooling
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Built-in
fan-cooled heatsink
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Power
Supply
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13.8
VDC ±15%, negative ground
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Current
Consumption
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Up to
~10–12 A at full output
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Dimensions
(W×H×D)
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160
× 70 × 220 mm (approx. 6.3 × 2.8 × 8.7 in)
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Weight
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~1.5–2.0
kg (approximate)
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Connectors
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SO-239
(RF In/Out), RCA (PTT control)
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Transmitter
Specification
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Details
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Input
Drive Power
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1–5
W typical (ideal for handheld or low-power mobile rigs)
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Maximum
Output Power
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70–90
W (typical FM/SSB output at 13.8 VDC)
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Gain
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~13
dB typical
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Input
Impedance
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50
ohms
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Output
Impedance
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50
ohms
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VSWR
Tolerance
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Protected
against high VSWR (reduced power or shutdown)
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Harmonic
Suppression
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60 dB
or better
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Preamp
Specification
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Details
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Preamp
Type
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Low-noise
transistor (solid-state)
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Gain
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~10–12
dB typical
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Frequency
Range
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430–440
MHz
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Noise
Figure
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~2 dB
(typical)
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Insertion
Loss (Bypassed)
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Negligible
(under 0.5 dB)
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Control
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Front
panel switch (Preamp ON/OFF)
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Receive/Transmit
Switching
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Automatically
bypassed during TX
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Impedance
(In/Out)
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50
ohms
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Features
-
Manual
or Automatic TX Control
• PTT keying via RCA input (preferred for SSB)
• RF VOX (optional RF-sensed transmit switching for FM use)
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Protection
Circuits
• Overdrive protection
• High VSWR shutdown
• Overheat protection
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Cooling
& Monitoring
• Internal cooling fan activates under load
• LED indicators for power and transmit status
Suggested
output power table for the Tokyo Hy-Power HL-90L UHF amplifier
(430–440 MHz), showing typical safe output power levels across
different modes under normal operating conditions (13.8 VDC, proper
ventilation, ambient temps below 30°C):
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Mode
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Typical
Max Output Power
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Notes
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SSB
(voice)
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80–90
W PEP
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Use
PTT control; natural pauses reduce thermal load
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CW
(Morse code)
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60–70
W
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Short
keying preferred; allow cooling between long QSOs
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FM
(voice)
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50–60
W
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Continuous
carrier; use 50% duty or less
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Digital
Voice (DMR, C4FM, etc.)
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40–50
W
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Continuous
duty; reduce power to protect finals
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FT8 /
FT4
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30–40
W
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High-duty
digital; use short sessions only
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RTTY
/ Packet / PSK
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30–40
W
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Continuous
waveform; only for short bursts
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AM
(if used)
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~25 W
carrier (~75 W PEP)
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Inefficient
mode; very high thermal load on carrier
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TOP
OF PAGE
Page initiated 03 July
2025
Page
last revised 18 July, 2025
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Space Weather
https://www.swpc.noaa.gov/
Notice Board
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VK6YSF JS8Call,
FSQ and
Olivia 8/250 operations.
Current
activity is generally, however not restricted to operations with
JS8Call, FSQ and Olivia 8/250 on the 20m and 40m band.
Proposed
band and mode activity
is often communicated on HamSpots: https://hamspots.net/js8/
or my profile on
X: https://x.com/vk6ysf97230
.
Feel free to contact
me to discuss or arrange a schedule for a contact.
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VK6MJM LF (136 kHz) and MF (474
kHz) Beacon
VK6MJM is a LF/MF station
located in Manjimup, Western Australia.
Mode: Mode: FST4W 300 (Similar to WSPR)
Station details were presented by
Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter
Hall VK6HP at PerthTech
QRZ Page: VK6MJM
on QRZ.com
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