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Date: Wed, 12 Sep 2018 11:53:38 +0100
From: Chris Wilson <dead.fets@gmail.com>
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Content preview: Hello LF'ers RX protection sought for either a Kenwood TS-590
or a Red Pitaya functioning as an SDR for the LF 136kHz band. Change over
relay box for the antenna has a 60 Amp automotive relay grounding the RX
line and changing to switching the antenna to the amp with a Russian high
power co-axial relay 500mS before TX starts. In case of unforeseen whoopsie
an automotive 5W festoon bulb would be in series with RX antenna input prior
to two back to back 6A10 diodes? The festoon bulb is long enough not to sustain
an arc over (I have tested on full power one side of the bulb to ground).
I don't believe the inductance of the bulb is significant "down there" frequency
wise. But I am unsure about the effect of the big diodes... [...]
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Subject: LF: RX protection scheme, is this sound???
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Hello LF'ers
RX protection sought for either a Kenwood TS-590 or a Red Pitaya
functioning as an SDR for the LF 136kHz band. Change over relay box
for the antenna has a 60 Amp automotive relay grounding the RX line
and changing to switching the antenna to the amp with a Russian high
power co-axial relay 500mS before TX starts. In case of unforeseen
whoopsie an automotive 5W festoon bulb would be in series with RX
antenna input prior to two back to back 6A10 diodes? The festoon bulb
is long enough not to sustain an arc over (I have tested on full power
one side of the bulb to ground). I don't believe the inductance of the
bulb is significant "down there" frequency wise. But I am unsure about
the effect of the big diodes...
Amp is a 1kW Class D FET amp, is this a sound scheme? The TX has a
separate exciter and the SDR or TS-590 function solely as a receiver
but sharing the TX antenna. Thanks.
--
Best regards,
Chris mailto:dead.fets@gmail.com