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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
|
General
Specification
|
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)
|
|
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)
|
|
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
|
TOP
OF PAGE
Page initiated 03 July
2025
Page
last revised 05 November, 2025
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Space Weather
https://www.swpc.noaa.gov/
|
Nikola Tesla, born on 10 July 1856, was one of
history's most influential inventors.
|
Notice Board
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VK6YSF JS8Call and
Olivia 8/250 operations.
Current activity is generally
focused - though not restricted to - JS8Call operations on the 30m, and 40m bands.
Olivia 8/250 is used occasionally on the 20m band.
Proposed
band and mode activity
is often communicated on HamSpots: https://hamspots.net/js8/
or my profile on
X: https://x.com/vk6ysf97230
.
Post
date: 5 July 2026
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Local
Repeaters
The Local Repeaters page has been updated with expanded and refreshed information on VHF and UHF repeaters across Western Australia's Central Coast, Perth, the Avon Valley, and the Peel region.
See: https://vk6ysf.com/local_repeaters.htm
Post
date: 5 July 2026
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MARMOTSat
An exciting upcoming amateur radio CubeSat
Proposed
launch date: 7 July 2026
Expected payload includes:
145.875 MHz – AX.25 packet digipeater
436.125 MHz – Telemetry & command (digital)
29.410 MHz – CW telemetry beacon, DVB-S2 experiments.
https://marmotsat.ca
https://www.propagationlab.ca/satellite/
Post
date: 5 July 2026
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Western Australian SSTV net
Popular
Western Australian SSTV net for both digital and anolog SSTV.
Generally
found at 7214.0kHz LSB every afternoon from 08:00 UTC (4:00pm WST)
For more
details: https://www.wasstv.net/wasstv.net/index.html
Post
date: 8 December 2025
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VK6MJM LF (136kHz) and MF (474kHz) Beacon
VK6MJM is a LF/MF station
located in Manjimup, Western Australia.
Common Mode: FST4W 300 (Similar to
WSPR)
Note:
other modes and sub-modes may be used.
Station details were presented by
Peter Hall (VK6HP) at PerthTech 2024.Presentation PDF: Peter
Hall VK6HP at PerthTech
QRZ Page: VK6MJM
on QRZ.com
Post
date: 10 March 2025
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