VLF,
Today, i'll start TXing on 17.4701 kHz. Start time is 16 UTC and i
intend to run a plain carrier at about 1 A antenna current.
I'm not happy with my linear PA. The efficiency is too bad an i often
get dead FETs!! I'm now thinking about a digital solution, a hard keyed
class-D PA in combination with a step down converter modulating the
supply voltage of the PA. Not a new concept but i never built one of
them. Does someone have a circuit recommendation to give some
inspiration?
If all works well i'll continue directly with an EbNaut message for Jay
and Garry and of course anyone else who is interested:
f = 17470.1000 Hz
Start time: 15:Mar.2018 23:30:00 UTC
Symbol period: 20 s
Characters: 3
CRC bits: 24
Coding 16K21A
Duration: 05:30:40 [hh:mm:ss]
Antenna current: 1 A
73, Stefan
Am 27.02.2018 09:23, schrieb Edgar:
Is it possible? Reception at Moonah, Tasmania.
Regards, Edgar
Moonah,Tasmania.
|
|
