[Amps] RX Protection

[Chris Hays]

------ Original Message ------
From: amps-request at contesting.com
To: amps at contesting.com
Sent: 9/13/2018 09:00:01
Subject: Amps Digest, Vol 189, Issue 6

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>   1. RX protection scheme, is this sound? (Chris Wilson)
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>Message: 1
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If you can do this at the input of the amp instead of output, the 
MFJ-1708SDR might be a good off-the-shelf solution.

Chris AB6QK

>Date: Wed, 12 Sep 2018 11:52:31 +0100
>From: Chris Wilson <chris at chriswilson.tv>
>To: amps at contesting.com
>Subject: [Amps] RX protection scheme, is this sound?
>Message-ID: <1885146034.20180912115231 at chriswilson.tv>
>Content-Type: text/plain; charset=us-ascii
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>
>
>  12/09/2018 11:42
>
>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 Wilson.
>mailto: chris at chriswilson.tv
>
>
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