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     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.

 

C1

Capacitor 6n8n

C2

Capacitor - 13.6nF = (10n 2kV + 3n3 2kv)

C3

Capacitor 6.8nF = (2000pF 3kV + 200pF 3kV)

L1

Single layer, close wound air inductor, 16uH, 38turns on a 25mm former. See air inductor design

L2

Single layer, close wound air inductor, 16uH, 38turns on a 25mm former. See air inductor design

 

 

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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Page last revised 12 March 2022

 

 

 

 

 

 

 

 

 

 

 
 

   Space Weather

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Merry Christmas Reindeer Gif

   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

 

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

 

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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Amateur Radio Station VK6YSF - Promoting amateur radio communication and experimentation.