Martin, Marcus, I don't see how adding a circulator will protect the Rx port of the USRP without blocking the signal from the CubeSat as well.
Are you transmitting and receiving on different frequencies? If so, you could insert a filter between the Rx port and the switch to block the Tx frequencies. On the other hand, if your Tx and Rx signals are in the same band, you can add a second switch in cascade with the first one to increase the Tx-Rx isolation. You can keep adding switches if necessary, until your isolation target is met. Regards, Brendan. On Mon, 19 Apr 2021, 23:52 Marcus D. Leech, <patchvonbr...@gmail.com> wrote: > 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 <patchvonbr...@gmail.com> > 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 < >> usrp-users@lists.ettus.com> 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 >> > _______________________________________________ >> > USRP-users mailing list -- usrp-users@lists.ettus.com >> > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >> > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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