Help Getting usrp.tune to work

I’ve been struggling with a particular USRP to get usrp.tune () to
work with a Flex400 daughtercard. It seems to work on the rest of
the USRP’s, and their various cards (including a Flex400), but not 1
in particular. Here is what I can provide; please ask for more info
if needed! - MLD

  • “print-db” returns:

RX d’board A: Flex 400 Rx MIMO B
RX d’board B: TV Rx
TX d’board A: Flex 400 Tx MIMO B
TX d’board B: Basic Tx

  • The daughtercard says “FLEX400” “10-11-05”.

  • I’ve tried using burn-db-eeprom with “rfx400”, “rfx400_mimo_b”, and
    “rfx400_mimo_a”, but the result is the same - usrp.tune () still
    doesn’t seem to work.

Michael D. wrote:

I’ve been struggling with a particular USRP to get usrp.tune () to
work with a Flex400 daughtercard. It seems to work on the rest of the
USRP’s, and their various cards (including a Flex400), but not 1 in
particular. Here is what I can provide; please ask for more info if
needed! - MLD

First let’s identify what hardware you have.

What rev is your USRP? If it is rev 4.0 or higher it is capable of
driving an RFX400, an RFX400_MIMO_A, or an RFX400_MIMO_B. If it is a
lower rev, it can only drive an RFX400 or an RFX400_MIMO_A.

Does your RFX400 have X1 and X101 populated or empty?
Which of the following resistors on the RFX400 are populated – R34?
R35? R36?
What was the eeprom originally programmed with?

Does this RFX400 work with other USRPs?
Does this USRP work with other RFX400s?

Matt

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