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Peter Miles
Northam, Western Australia
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10MHz LOCAL OSCILLATOR
10MHz local oscillator. Under
development
HOME > PROJECT
> 630M
TRANSVERTER
>
The
10MHz local oscillator design is a combination of G3XBM
designed local oscillator used for a similar 137kHz transverter and an ARRL Hand Book's
local oscillator design for a 160m band transverter. The success of
the this 10MHz oscillator will also be the used for a future 137kHz transverter.
Fig 1 Schematic of the
10MHz crystal lock oscillator and buffer stage. This circuit is
subject to further development.
Component
details
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XTAL
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XTAL 10MHz Fundamental
HC49U
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Q1
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Transistor - 2N3904
TO-92
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Q2
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Transistor - 2N3904
TO-92
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R1
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Resistor 100k 0.25W
Carbon
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R2
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Resistor 33k
0.25W Carbon
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R3
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Resistor 470
0.25W Carbon
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R4
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Resistor 10k 0.25W
Carbon
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R5
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Resistor 4k7 0.25W
Carbon
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R6
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Resistor 100 0.25W
Carbon
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R7
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Resistor 100 0.25W
Carbon
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C1
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Capacitor - trimmer 5
- 60pf (35pf)
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C2
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Capacitor - Ceramic -
100pf
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C3
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Capacitor - Ceramic -
100pf
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C4
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Capacitor - Ceramic -
33pf
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C5
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Capacitor - Ceramic -
100nf
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C6
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Capacitor - Electrolytic
- 47uf 50v
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C7
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Capacitor - Ceramic -
100nf
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L1
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FT50-43 Toroidal
core Amidon PN# FT-50-43
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L2
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FT50-43 Toroidal
core Amidon PN# FT-50-43
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The two RF transformers are wound per
Fig 2 & 3 winding details of 10turns of Bifiliar and Trifiliar
windings on a FT50-43 Toroidal cores.
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Fig 2
L1
winding details for the matching transformer
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Fig 3
L2
winding details for the splitter transformer
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Photo 1 Assembled L1 matching transformer
Photo 2 Assembled local
isolator and buffer 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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Michael Faraday
born 22 Sep 1791
Shaping the modern electrical age, Michael Faraday (1791–1867) was a pioneering British scientist who transformed our understanding of electricity and magnetism. His discoveries included electromagnetic induction, which laid the foundation for electric generators and transformers, as well as the principles behind the electric motor.
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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 20,
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: 27 August 2026
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Local
Repeaters
Repeaters Page Updated
- Expanded and refreshed information on VHF and UHF repeaters across Western Australia's Central Coast, Perth, the Avon Valley, and the Peel region. New AllStar Link information has also been added, including linked repeater details and
gateway information across the State.
Repeaters
details:
https://vk6ysf.com/local_repeaters.htm
AllStar Link notes:
https://vk6ysf.com/allstar_notes-20260703.htm
Post
date: 27 August 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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