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| To: | [email protected] |
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| Subject: | Re: ULF: EbNaut message transmitted from ground loop |
| From: | DK7FC <[email protected]> |
| Date: | Fri, 12 Apr 2019 19:34:36 +0200 |
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Just for those interested, attached is a plot showing the stability of
the antenna current (slightly uncalibrated) during the > 2 hour portable
transmission. The power cunsumption started at 487 W and dropped during
the experiment, as expected from a battery :-)
But, 2.38 A to 2.28 A is just -4.2 % after about 1 kWh taken from a 18
kg weighting battery. Ignore the dips in the plot, this can happen
during an EbNaut transmission.
The antenna current is measured by SpecLab, using a current transformer
producing a small voltage across a low resistance, measured by one of
the soundcard inputs. The level in Ampere can be calculated. This
current tracking is also necessary to control and correct the phase in
case of a phase glitch of the DAC or in case of a changing phase in the
antenna...
73, Stefan
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