On 04/19/2021 09:49 AM, Martin Elfvelin wrote:
Thank you for your input. Do you suggest adding a circulator to the
system or rather replacing the switch with a circulator?
Best regards,
Martin
I'd say add a circulator in addition to your switch.
On Mon, Apr 19, 2021 at 3:43 PM Marcus D Leech
<[email protected] <mailto:[email protected]>> wrote:
A circulator can give you an additional 20dB isolation.
Putting 5d!m into the RX2 port will likely destroy the RX
amplifier in the AD9361.
Sent from my iPhone
> On Apr 19, 2021, at 9:12 AM, Martin Elfvelin via USRP-users
<[email protected] <mailto:[email protected]>>
wrote:
>
>
> Hello all,
>
> I am planning on using a USRP B200 in a half-duplex
communication system to communicate with a CubeSat. The TX/RX port
will be used for transmitting and the RX2 port for receiving. The
transmitting port will be connected to a power amplifier with a
60W output, this will in turn connect to an RF switch which will
switch between the TX/RX (transmitting) and RX2 (receiving). The
RF switch has an isolation of ~40-43 dB which means from the 47.78
dBm transmitted we will have roughly 5-8 dBm reflected to RX2.
Since the SDR is only rated to receive maximum 0 dBm I'm wondering
if someone has any ideas on how to handle this. I'm unsure if this
power will simply fry the board and I should implement a power
limiter or if there are other workarounds.
>
> Appreciate any help you can provide.
> Best regards,
> Martin Elfvelin
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