On Thu, Jun 16, 2016 at 8:21 AM, Pierre Baudry <pierre.baudry(a)diateam.net> wrote: B200 is a single RF channel device. Now that GPRS is working with osmo-bts-trx and osmo-trx, I will begin merging the multi-carrier transceiver chain in the coming week. The history is that multi-arfcn was initially developed on the single channel USRP2. In later devices, such as the UmTRX and B210, there were advantages in both simplicity and RF performance from separate discrete channels, and that became the preferred multi-channel approach used for later testing. There are still, however, benefits (i.e. cost and higher capacity support) to the multi-carrier approach on a single physical RF channel that make it worthwhile to support in mainline. -TT

Hi Harald, On Fri, Jun 17, 2016 at 6:13 PM, Harald Welte <laforge(a)gnumonks.org> wrote: I completely agree that multi-arfcn support should be in the master. That said, I don't agree that it's always superior to existing approach we have with UmTRX/UmSITE where we use separate radio paths for different TRX. We couldn't achieve power efficiency and flexibility if we were using multi-arfcn approach. Not to mention that single ARFCN per TRX allows us to use simpler receivers. You also don't need a combiner if you want to route two TRX to a single antenna - X-Pol antennas are very popular and easy to get. And for more powerful BTS's (like 10W per channel) you can get real benefit from diversity receive, which again requires separate radio paths for both channels. -- Regards, Alexander Chemeris. CEO, Fairwaves, Inc. https://fairwaves.co