Re: [Discuss-gnuradio] IQ imbalance...

[Per Zetterberg]

I also have a xcvr2450 that won't lock sometimes. This is at 2.4GHz.

Also an issue about IQ imbalance:

I am measuring IQ imbalance. The values are generally quite good. 
However, one thing I don't understand is that the mirror frequency 
doesn't turn up on exactely "-f" but a few Hertz off. I don't get this. 
Are we sure that the down-conversion on the FPGA is completely turned off ?

BR/
Per



Ian Holland wrote:
> Hi Matt
>
>   
> > Yes, -9 dBm is safe.
> >     
>
> Glad to know it was all safe re input levels.
>
>   
> > I have not seen the problem locking without trying a lower frequency. 
> > What if you try 5 GHz twice in a row?
> >     
>
> The problem with the not locking to 5G is very intermittent. A few times
> when it did occur, I tried your suggestion of trying 5G a second time:
>
> 2 out of 3 times, it locked the second time. The other time, it did not,
> but then trying 2.35G followed by 5G did then work.
>
> Regarding the other intermittent issue that appeared as IQ imbalance, I
> have swapped the USRP2/XCVR2450 pair used for transmit with the receive
> one, and haven't observed the issue since. It may still occasionally
> occur for the first pair, but this is a workaround for me. I am still
> confused as to why it occurred to begin with.
>
> Best Regards
>
> Ian.
>
>
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