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Contact Details
Peter Miles
Northam, Western Australia
QRZ Page: VK6YSF
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LOW PASS FILTER FOR 630M BAND
630m band (472kHz-479kHz) Low Pass Filter.
Under
development
HOME > PROJECT
> 630M
TRANSVERTER
>
Common
Low Pass Filter
Additional
Low Pass Filter that is common to both the transmit board and receiver
board.
Fig
2 Schematic of the external low pass filter stage. This circuit is
subject to further development.
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C1
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Capacitor
6n8n
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C2
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Capacitor
- 13.6nF = (10n 2kV + 3n3 2kv)
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C3
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Capacitor 6.8nF =
(2000pF 3kV + 200pF 3kV)
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L1
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Single
layer, close wound air inductor, 16uH, 38turns on a 25mm former.
See air inductor design
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L2
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Single
layer, close wound air inductor, 16uH, 38turns on a 25mm former.
See air inductor design
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Fig 3
AADE Filter Design
4.5 attenuation analysis of the common low pass filter circuit.
Fig 4 AADE Filter Design
4.5 attenuation analysis of the common low pass filter circuit.
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OF PAGE
Page
last revised 12 March 2022
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Space Weather
https://www.swpc.noaa.gov/
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Nikola Tesla, born on 10 July 1856, was one of
history's most influential inventors.
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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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