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Author Topic: LW Transmitter - homemade Not Bought!  (Read 9316 times)

Offline IRF510

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LW Transmitter - homemade Not Bought!
« on: January 04, 2014, 1212 UTC »
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

Offline refmo

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Re: LW Transmitter - homemade Not Bought!
« Reply #1 on: January 04, 2014, 1524 UTC »
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


Northeast Kentucky
Please eQSL to refmo[at]outlook[dot]com
Radios: Afedri AFE822x, Airspy HF+, RX-888, RSPdx, Tecsun PL880
Antennas: 700' Loop Skywire, Wellbrook ALA1530LN Loop, 400' Beverage, 34' Vertical, low dipoles on upper bands.

Offline IRF510

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Re: LW Transmitter - homemade Not Bought!
« Reply #2 on: January 04, 2014, 1608 UTC »
Schematic , not KIT!
There is another countries than USA.
I live in Georgia (country - not georgia Atlanta)

Offline redhat

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Re: LW Transmitter - homemade Not Bought!
« Reply #3 on: January 04, 2014, 1624 UTC »
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
« Last Edit: January 04, 2014, 1641 UTC by redhat »
Somewhere under the stars...
Airspy HF+, MLA-30/Mini-whip/Chi-Town Loop
Please send QSL's and reception reports to xfmshortwave [at] proton [d0t] me

Offline bumbelstock

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Re: LW Transmitter - homemade Not Bought!
« Reply #4 on: January 07, 2014, 1116 UTC »
 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
Greetings from the Yellow Bumbelstock

RX from central Germany

 

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