[Discuss-gnuradio] USRP-1 and 4ch receiver?

Dear experts,
<I send to both GNU Radio and USRP mailing lists.>

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 Yamamoto / RISH, Kyoto University
yamamoto@rish.kyoto-u.ac.jp
Phone +81-774-38-3814, Cell +81-90-5653-7555

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