Based on an idea by Bruce Dog Radio Studio 2 - Updated 2-2-12
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U.S. F.C.C. RULES Part 15.217 Operation in the band 160 - 190 kHz.
(a) The total input power to the final radio frequency stage (exclusive of filament or heater power) shall not exceed 1 Watt;
(b) The total length of the transmission line, antenna, and ground lead (if used) shall not exceed 15-meters;
(c) All emissions below 160 kHz or above 190 kHz shall be attenuated at least 20 dB below the level of the unmodulated carrier. Determination of compliance with the 20 dB attenuation specification may be based on measurements at the intentional radiator's antenna output terminal unless the intentional radiator uses a permanently attached antenna, in which case compliance shall be demonstrated by measuring the radiated emissions.
Project Information: This project grows out of this continuing thread at part15.us, website for Part 15 low power enthusiasts in the U.S.
Longwave Broadcast DX 171 kHz
PLEASE POST ALL CORRESPONDENCE REGARDING THIS PROJECT AT THAT THREAD.
There are adjunct threads opened at part15.us with more long wave transmitter discussion.
Palomar 1750 Meter Transmitter
1750 Meter Transmitters
The objective is to modify the Big Talker transmitter found on this KDX website, by changing the Oscillator and Final.
As of this time Radio8Z has submitted a simulation of a possible final stage for DEEP VOICE.
PROJECT UPDATE 2-2-12 - As of this time the project lacks a long wave oscillator circuit.
Jan. 8, 2012 DEEP VOICE VERSION 2.0.0
Submitted for Your Review
Version 2.0.0 is based on a modification suggested by RFB, 12-31-11, to employ the PLL circuit linked below in place of a crystal.
The PLL circuit requires design of a LW oscillator, as yet not done. For now this is shown as IC2.
Parts List
PLL kit:
http://shop.willyselectronics.com/browse.cfm/-datakit-pll-experimenter-kit-from-khz-to-185-mhz-/4,5355.html
Dec. 3, 2011 DEEP VOICE VERSION 1.0.0
Submitted for Your Review
The oscillator circuit is taken from Simple LowFER Transmitter by Lyle Koehler, K0LR
http://www.nutstreet.net/k0lr/lftx.htm
As of 2-1-12 this link seems dead.
UPDATED PLAN 2-2-12 - Since Lyle Koehler's link for the above oscillator circuit is unavailable, I will not be building this oscillator.
If you build it and test it please attach your results to the project link up above.
More Parts List
Q2 = PN2222A
X1 : Target Frequency = 162kHz *16= 2.592mHz *32= 5.184mHz *64= 10.368mHz
Target Frequency = 180kHz *16= 2.880mHz *32= 5.760mHz *64= 11.520mHz
Crystal Source Suggested by MRAM:
http://www.crystek.com/home/crystal/quartzcrystal.aspx
Other Modules
Power Supply : Pending
Audio Modulator : Same as Big Talker
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