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"Sync Error" Issue in EVM mode

Question asked by gautham.j on Sep 9, 2010
Latest reply on Feb 2, 2012 by tabbott

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Hi,
While testing EVM using N9020A MxA, "Sync Error" is continuosly observed.
Could not find any information about this error or it's resolution from MxA manuals.
The MxA is being fed a GMSK signal in the RF port, 13MHZ external clk is connected to "Ref In" port, and 216.66Hz(Frame Clk) provided in Trigger1 In port. MxA has been configured accordingly for these inputs.The 13MHz clk and trigger signals have been verified using a Freq. counter.Also, what does the "RF sync delay" option in the MxA signify?

Thanks in advance for your reply.

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tabbott Sep 13, 2010 10:57 AM
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Hello -

Are you using the 89601A application, or the N9071A GSM/Edge application?
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krishk24 Jan 10, 2012 12:03 PM
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was this issue resolved. I am geting a similar error when using N9030A PXA signal analyzer using the GSM/Edge mode. I am trying to measure Edge EVM. The EVM measurement shows up intermittently but also blinks with "sync error" and when the error blinks, the measurements blank out and display a "F" indicating fail. no burst mode testing is being done.

Burst mode - Normal
Training sequence - Auto
Trigger Source - Immediate
Burst Sync - none
Time Slot - Off
Carrier Type - Cont
Frequency Hopping - No
Device type - MS
Trigger - None

not sure if i have missed out any other settings that are needed to debug.

thank you
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tabbott Feb 2, 2012 12:53 PM
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Hi -

Under the [Mode Setup] <Demod> <Burst Type> menu, you can choose which burst type the analyzer should expect. It is possible that the reason why it is not syncing to some of the bursts is that they are a burst type that the analyzer is not set to. For instance, it could be that the a RACH burst is being sent every so often, and when the analyzer triggers on the RACH, it gives a sync error because it is set to demod Normal (TCH & CCH) bursts.

Concerning what the RF Sync Delay functionality does, it allows you to offset in time the T0 time point in the burst from where it actually is. This is helpful for debugging issues with the burst shape and timing.

Regards -
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"Sync Error" Issue in EVM mode

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