I have two USRP B100 and I am trying to sync them for that I have connected them both to reference and 1pps from the same source the source is a rubidium standard source reference it has a 10MHZ 1Vrms 50 ohm sine and 1pps outputs. I have tested it with a scope to see if its stable. for my test I transmit from one USRP B100, and receive from the other USRP. I configured both devices for: clock source: external time source: external sync: unknown 1pps
tested the output with WX GUI FFT Sink on the Rx side whenever I set the clock source to external on the receiver side, instead of getting a carrier, I get a distorted signal: the I and Q are not constant envelope, as they should be. whenever I set the clock source for default, I get a carrier, but it is shifted a few 100s of hertz from the wanted signal and it changes every a few 100s of hertz (it is not constant) I am using the latest version of GNU Radio I didn't see any warning or error message when disconnecting the 10MHz clock ref. I did see an error message when I disconnected the 1pps ref. is this a known problem? is this expected? if not, what am I doing wrong? I am adding the grc files here is the log (it seems fine, and look identical for Tx and Rx): Generating: "/home/guy/Documents/top_block.py" Executing: "/home/guy/Documents/top_block.py" linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.005.003-78-g49a4929b -- USRP-B100 clock control: 10 -- r_counter: 2 -- a_counter: 0 -- b_counter: 20 -- prescaler: 8 -- vco_divider: 5 -- chan_divider: 5 -- vco_rate: 1600.000000MHz -- chan_rate: 320.000000MHz -- out_rate: 64.000000MHz -- -- 1) catch time transition at pps edge -- 2) set times next pps (synchronously) Regards, Guy
simplerx.grc
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simpletx.grc
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