Greg, Sorry for the delay response -- see below
Steve Stephen Hicks, N5AC VP Engineering FlexRadio Systems™ 4616 W Howard Ln Ste 1-150 Austin, TX 78728 Phone: 512-535-4713 x205 Email: [email protected] Web: www.flexradio.com Click Here for PGP Public Key<https://sites.google.com/a/flex-radio.com/pgp-public-keys/n5ac> *Tune In Excitement™* PowerSDR™ is a trademark of FlexRadio Systems On Sat, Feb 2, 2013 at 9:37 PM, Greg <[email protected]> wrote: > Steve, > > If I have two slices open on the same pan adapter on the same band are > there any issues to the second slice when transmitting on the first one? > Inter mod? Full duplex? > Well, this depends. If you have a 6700 and they are on different antenna ports and so different physical antennas, you can receive at the same time that you transmit provided you don't overload the SCU. In general, at 100W of output power you would need >40dB of antenna isolation to prevent an overload. If you have a 6700 and you are transmitting on the same antenna that you are using as a receiver for the slice, the antenna will be switched away from the SCU and you will not be able to receive while you transmit. On a 6500, the problem is essentially the same as it turns out in this case. We've gone to great lengths to have world-class phase noise and intermod performance. We have not yet done this exact experiment, but we should fare well in this test. > What about if a second pan adapter is open connected to the second scu? > Will external bandpass filters be needed to prevent intermod on the second > scu? > The SCU(s) and transmitter are independent in the radio and only "come in contact" at the antenna ports. Provided you have separate RX and TX antennas, you can listen while you transmit. The radio will overload just shy of +10dBm (10mW) and will actually disconnect the receiver from the antenna port for protection about +20dBm (100mW). If you are transmitting +50dBm (100W), you can see the isolation required to prevent an overload and prevent the radio from protecting itself. The second panadapter/receiver would function just as the first, but you can use two antennas at the same time. So what filters you might need is a function of a number of things including your antenna coupling, how much power you are running, which band you are listening on/transmitting on, and the radio's performance characteristics. We've published both the phase noise and IMD3 numbers for the radio, but we've not run this experiment yet. > Are slices on different pan adapters but on the same scu full duplex for > SO2R or is full duplex only possible when using two SCUs? > If you are transmitting and listening on different antennas, you can run full duplex on one SCU because the transmitter and SCU are independent. 73, Steve Thanks! > > 73 > Greg > _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software innovation and other technical SDR topics.
