HFU HF Underground
Technical Topics => Equipment => Topic started by: IRF510 on January 04, 2014, 1212 UTC
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Hello,
I'm a young radioamateur. I like a Homemade.
Did this forum supports people who want transmitting - Not listening?
I want to build longwave AM transmitter.
Now i have found amplifier for 137kHz on BC547 and two IRF630.
Please show me a generator for this amplifier. Not on X-Tal(Capacitor and Coil putted into shield)
http://www.qsl.net/df3lp/projects/lftx/tx50.gif
73! Mystery IRF510
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If a kit would be acceptable, North Country Radio in New York has a 1-watt synthesized LW transmitter kit....
http://www.northcountryradio.com/Kitpages/lf90.htm (http://www.northcountryradio.com/Kitpages/lf90.htm)
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Schematic , not KIT!
There is another countries than USA.
I live in Georgia (country - not georgia Atlanta)
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If you are seeking information on building transmission equipment, then the "Black Arts" forum would be a better choice. You can search the internet as well as the rest of us. Try and be polite, we're only trying to help you.
That aside, PLL in that frequency range is easy to achieve with a few TTL components. That's the way I would go, at least that way it wont drift all over the place on you.
+-RH
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I have built this MW TX for my home and i think this TX will work on LW with change the Coil 'L'.
Picture and schematics in Attach.
Greeting's and good DX!
R1 = 1k
R2 = 2,7 k
R3 = 2,7 k
R4 = 2,7 k
C1 = 0,22 µF (Tantal)
C2 = 100 pF
C3 = 390 pF
C4 = 390 pF
T1 = JA 101 (any HF - Transistor (BF xxx), PNP, 30V and 0,2A are perfect)
L = ca. 80 - 100 Wdg. (for MW !) ;D