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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
|
|
Type
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Solid-state
UHF Linear Amplifier
|
|
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
|
|
Current
Consumption
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Up to
~10–12 A at full output
|
|
Dimensions
(W×H×D)
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160
× 70 × 220 mm (approx. 6.3 × 2.8 × 8.7 in)
|
|
Weight
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~1.5–2.0
kg (approximate)
|
|
Connectors
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SO-239
(RF In/Out), RCA (PTT control)
|
|
Transmitter
Specification
|
Details
|
|
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)
|
|
Gain
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~13
dB typical
|
|
Input
Impedance
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50
ohms
|
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Output
Impedance
|
50
ohms
|
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VSWR
Tolerance
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Protected
against high VSWR (reduced power or shutdown)
|
|
Harmonic
Suppression
|
60 dB
or better
|
|
Preamp
Specification
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Details
|
|
Preamp
Type
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Low-noise
transistor (solid-state)
|
|
Gain
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~10–12
dB typical
|
|
Frequency
Range
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430–440
MHz
|
|
Noise
Figure
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~2 dB
(typical)
|
|
Insertion
Loss (Bypassed)
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Negligible
(under 0.5 dB)
|
|
Control
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Front
panel switch (Preamp ON/OFF)
|
|
Receive/Transmit
Switching
|
Automatically
bypassed during TX
|
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Impedance
(In/Out)
|
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
-
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
|
Typical
Max Output Power
|
Notes
|
|
SSB
(voice)
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80–90
W PEP
|
Use
PTT control; natural pauses reduce thermal load
|
|
CW
(Morse code)
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60–70
W
|
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
|
|
Digital
Voice (DMR, C4FM, etc.)
|
40–50
W
|
Continuous
duty; reduce power to protect finals
|
|
FT8 /
FT4
|
30–40
W
|
High-duty
digital; use short sessions only
|
|
RTTY
/ Packet / PSK
|
30–40
W
|
Continuous
waveform; only for short bursts
|
|
AM
(if used)
|
~25 W
carrier (~75 W PEP)
|
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/
Notice Board
|
VK6YSF JS8Call and
Olivia 8/250 operations.
Current activity is generally
focused - though not restricted to - JS8Call operations on the 20m, 30m, and 40m bands.
Currently
there is a particular emphasis on JS8Call on the 10 and 12 m band between 00:00 and 12:00 Z, often extending beyond this period.
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
.
Feel free to contact me to discuss or arrange a schedule for a contact.
Post
date: 7 December 2025
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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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