Re: [Discuss-gnuradio] E312 - Broadband Noise in Spectrum During Retuning

[Marcus Müller]

Hi Michael,

I think you're right, looks like spurs of the tuner / synthesizer, due to the TX amp not getting shut down for tuning. Do these go away if you set the tx_gain to zero just before and to its original value just after tuning?

Best regards,

Marcus

On 03/09/2017 08:21 PM, Michael Skaggs wrote:

Hi all,

We are working with an E312 platform and are seeing large, broadband frequency spikes when the system must retune over a wide set of frequencies.

I have attached a photo of the issue. The blue you see near the top of the spectrum is the noise we are talking about. We are currently tuning the system between 345MHz, 400MHz, and 455MHz. We suspect this issue is occurring due to the amplifier not turning off during the retune, however, we did not find any topics already discussing this problem.

Could this be an issue with our hardware, or is there a way to work around this issue?

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