# USRP-1 and 4ch receiver? **URL:** \ **Category:** GNU Radio\ **Created:** [August 7, 2014, 2:48am UTC](https://www.ruby-forum.com/t/usrp-1-and-4ch-receiver/231422 "2014-08-07T02:48:44Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [August 7, 2014, 2:48am UTC](https://www.ruby-forum.com/t/usrp-1-and-4ch-receiver/231422/1 "2014-08-07T02:48:44Z")
Dear experts, I am now using URSP-1 for 2-channel receiver (150/400MHz) successfully. Now there is a plan to expand this to 3-ch or 4-ch. As the frequencies are very far apart, i.e., 150MHz/400MHz/~1GHz/~2GHz, we need separated antenna/front-ends. I know that before it was possible to organize 4-ch receiver by setting 2 Basic-RX on USRP-1, and use (in-total) 4 SMA connectors for inputs. I think of Python code with GNU Redio. Sure coherency between signals are important. I have some questions, (1) Is this 4-ch receiver still possible with recent GNU Radio + USRP-1? (2) What is its sample codes? Where can I find it? (3) Please tell me if there is any other hardware that enables this 4-ch receiver? Thank you very much for your suggestions. Regards, – Mamoru Y. / RISH, Kyoto University removed\_email\_address@domain.invalid Phone +81-774-38-3814, Cell +81-90-5653-7555