Neel,

I updated to: UHD_3.14.1.1-0-g0347a6d8  as well as v3.7.13.5 for GR, still the 
same issues.

It almost feels like some sort of double/float mismatch somewhere since the 
alignment is so close to being right.

________________________________
From: Neel Pandeya <[email protected]>
Sent: Monday, September 30, 2019 11:19 AM
To: Jason Matusiak <[email protected]>
Cc: usrp-users <[email protected]>
Subject: Re: [USRP-users] next pps issues with TwinRX

Hello Jason:

We'll look into this and get back to you shortly.

If you get a chance, could you please try it with the tagged UHD 3.14.1.1 ?

Which version of GNU Radio are you using?

--Neel Pandeya



On Mon, 30 Sep 2019 at 10:10, Jason Matusiak via USRP-users 
<[email protected]<mailto:[email protected]>> wrote:
We are having another issues with our TwinRXs.  A co-worker has been trying to 
get this to work for a while, but has had no luck with the PPS timing.  Here is 
the notes:

We are running UHD_3.14.1.HEAD-12-g5f75f73f.

The setup is a single X310 (revision: 11,  revision_compat: 7) with two TwinRX 
boards. The device gets Ref/PPS from an Octoclock.

The attached script has a hard-coded IP address and clock rate. It works for 
other X310s with UBX/SBX daughter boards as well as the E320.

Good results are (note line 5 below):

Synchronizing Radios to Reference Signals
Checking PPS synchronization
next_pps from 1569851984.633563 is 1569851985.000000
Setting time for radio `gr uhd usrp source`: 2019-09-30 09:59:45
PPS alignment PASSED!: [1569851986.0, 1569851986]
All radios are Synchronized

Bad results are:
Synchronizing Radios to Reference Signals
Checking PPS synchronization
next_pps from 1569851508.136703 is 1569851509.000000
Setting time for radio `gr uhd usrp source`: 2019-09-30 09:51:49
PPS alignment mismatch: [1569851509.9999995, 1569851509]

Any thoughts of why this might be happening?

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