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Re: [Discuss-gnuradio] external clock issue with B100 + WBX
From: |
Marcus Leech |
Subject: |
Re: [Discuss-gnuradio] external clock issue with B100 + WBX |
Date: |
Mon, 3 Jun 2013 19:19:40 +0000 (UTC) |
Tune request is independant of external clocking--that's an orthogonal property of an instantiated device object.
On TX the LO will be tuned to whatever you've set as the LO offset, so any LO leakage will appear there, but your signal will be where it's supposed to be.
570hz/915e6Hz is a residual frequency error of 0.6PPM.
What are you using for your external reference? The B100 clock itself is good to about +/- 2.5PPM, so 0.6PPM sounds like it's locking to an external reference, or you're just "lucky".
uhd.tune_request() is used to request a tuning with more-complete control over the RF and DSP tuning aspects:
I'd suggest you familiarize yourself with the entire documentation tree that's online:
on Jun 03, 2013,
Guy Holtzman <address@hidden> wrote:
LED E is always on, even when I disconnect the external source
I used this command on the Tx:
uhd.tune_request(915000000)
and this command on the Rx:
uhd.tune_request(915000000,10e6)
the freq is now very stable
but there is a constant shift of 570 Hz between Rx and Tx
another strange thing happened:
when I used the command
uhd.tune_request(915000000,10e6)
on the Tx, the USRP transmitted with a shift of 10 MHz (minus a few 100s Hertz)
is this ok?
what can I do to solve the constant shift of 570Hz
what is the uhd.tune_request command and how can I use it when configured to external clock?
Thanks, Guy
- [Discuss-gnuradio] external clock issue with B100 + WBX, Guy Holtzman, 2013/06/02
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Marcus D. Leech, 2013/06/02
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Guy Holtzman, 2013/06/03
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Marcus D. Leech, 2013/06/03
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Guy Holtzman, 2013/06/03
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX,
Marcus Leech <=
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Guy Holtzman, 2013/06/04
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Marcus D. Leech, 2013/06/04
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Guy Holtzman, 2013/06/04
- Re: [Discuss-gnuradio] external clock issue with B100 + WBX, Guy Holtzman, 2013/06/04