In order to complete my first QSO with El Silbo I resorted to sending Morse code, by
literally speaking "DIT DAHHH DIT," etc., into the loudspeaker (working backwards as
an acoustic to electical power generator). This gave me the idea to build a dedicated
voice-powered CW transmitter. I call this CW transmitter the New England Code Talker.
As indicated by the schematic diagram, the incoming acoustic energy is bridge-rectified
in order to energize a crystal-controlled RF oscillator. To operate this radio I speak
loudly, with my mouth pressed into the tin-can. CW characters are produced by the length
and spacing of the sounds that I utter. At present, the output RF power is 20mW on 80m.
A 20m version of this voice-powered transmitter was constructed on 11/04/09. On
the next day I made four great contacts with it running an RF output power of 15mW.
Band Station His/Mine QTH Distance Comments
80m AA1MY 589/559 Bethel, ME 160km "gud cpy"
80m K1MPM 599/569 Freeport, ME 214km "wow really big sig fer ten mw"
80m W1DFU 579/579 Wallingford, VT 68km
80m KB1KGA 599/579 Mt. Vernon, NH 152km "solid cpy hi vy gd sig"
80m W1PID 569/599 Sanbornton, NH 109km "peaking S9 hi"
80m W4OP 569/469 Glenville, NC 1329km I peaked 569
80m NU4I 559/239 Williamsburg, VA 826km I peaked 439
20m W4OP 599/579 Glenville, NC 1329km Please listen to the recording below!
20m K4NK 559/339 Anderson, SC 1364km
20m W4FOA 599/579 Chickamauga, GA 1486km "FB Mike ur an honest 579"
20m WE5O 599/519 Seneca, SC 1367km
80m W1PID 599/599 Sanbornton, NH 109km 17min. QSO using my normal speaking voice!
80m W1LVT 599/338 Richford, VT 100km I answered Len's CQ
80m VE2FKZ 579/577 nr Montreal 131km Michel answered my CQ
80m AA1MY 579/549 Bethel, ME 160km Seab copied me down to 10mW using his Reggie!
80m WA2HRS 569/539 Rome, NY 236km Heathkit HW-8 to an inverted vee
80m KD1MA 599/559 Killingworth, CT 298km Bob answered my CQ
W4OP very kindly recorded my voice-powered signal on 20m at his QTH (a distance of 1329km). Please
click here to listen to it. Bear in mind that both the RF energy and the keying were produced by
my saying the likes of "Dooo Do Dooo Do Dooo Dooo Do Dooo" (= "CQ") loudly into loudspeaker.
On 11/5/09 I received an SWL report from AD5VC (thank you, Dana!) at a distance of 2214 km.
"You were 229 at about 1420z at K5LSU on the LSU campus in Baton Rouge. I had you at 14054.8 kHZ. I heard only a partial call sign ?A1TJ and copied nothing more for a couple of minutes. Then back up for full call sign AA1TJ a couple of minutes later."
Here are some nice comments made by some of the stations that I've worked with this transmitter.
"I just had the pleasure of working Michael's New England Code Talker from my QTH in the N.C. mountains to Vermont
at 826 miles. The band was so-so and no copy on the high dipole, but when I switched to the NE Beverage- there he
was 469. Still hearing him from my office- some 30' from the shack. I have now worked Reggie during the summer QRN
and Code Talker- quite a thrill. Thanks Michael. BTW, your current CQ is an honest 569! 100% copy. Unbelievable."
"Mike....this was easily as good as my first microwave EME QSO. I was absolutely astounded at your signal strength."
"Well, that was a real hoot! I received the 559 reports easily at 439...." Ken, NU4I
"Mike is still S5-S7 on 14055 at 1415Z...amazing! Still CQing. Good CW,
sounds almost like an automatic beacon "CQ AA1TJ" (pause). I'm sure his
voice must be getting a bit "raspy" now but a pure DC note, hi." Tony, W4FOA