Hi Dave, Henny and LF group,
Thanks for the fine capture, Henny. With a bit of imagination, a complete
callsign can be resolved.
Dave, the TX comprises an F1AFJ synthesier with an output of 6 MHz
buffered with a G3NYK BJT stage to a CMOS 4020 divide by 32 and keyed
using the reset line with a diode matrix ID'er set at ~QRSS75. The
184.5093 square wave from the 4020 is fed to the gate of an IRF630
of a Class E amp (Thanks to Alan's spreadsheet design). The output
is 10 watts. This goes to a pair of pie wound litz coils (~0.9 mH)
whose separation is adjusted to tune a 100m wire at about 10m high.
Matching is achieved using an autotransformer, although the
resistive component appears to be close to 50 ohms. The aerial current
is about 0.5 amps.
73
Joe
On Tue, 27 Jan 2009, dave.riley3 wrote:
Hi Joe,
Can you give us your TX details again?
TNX
Dave @ WD2XSH/17
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