Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup

[Marcus D. Leech]

On 07/16/2018 02:05 PM, Ayaz Mahmud wrote:

Hi Marcus,

 

The issue is even I put the vector source toggling with 1 and 0s it transmit a signal. So I need something that will not transmit at all and switch between these 2 radio chains.

 

Thanks,

Ayaz

You're probably seeing the residual LO leakage during periods of "no transmit".

You can try using offset-tuning to move the leakage out-of-band:

Use:

uhd.tune_request(frequency,offset)

In the UHD sink for the "frequency" field.

 

From: Marcus D. Leech
Sent: Saturday, July 14, 2018 8:15 PM
To: Ayaz Mahmud; "Müller, Marcus (CEL)"; address@hidden
Subject: Re: [Discuss-gnuradio] Enable/Disable TX ports in B210 in 2x2 setup

 

On 07/14/2018 06:40 PM, Ayaz Mahmud wrote:

Hi Muller / Marcus,

 

I got the testing right now, but unfortunately it doesn’t work while I put it in my original file.

 

Here is the attached .grc where I have used vector source as input and multiply a period with 1 and then with zeros on one radio channel and opposite on the other.

 

Can you please have a look, and check if I am doing anything wrong ?

 

Ayaz

 

You're asking us to debug a very complex signal flow.

Why don't you try something a *lot* simpler to get the TX-flow-switching-logic correct first, and then work up from there.