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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/
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 20m, 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
.
Feel free to contact me to discuss or arrange a schedule for a contact.
Post
date: 2 January 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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