I Q Supression

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Stan
Posts: 11
Joined: Thu Apr 02, 2015 11:05 pm

I Q Supression

Postby Stan » Thu May 07, 2015 9:33 pm

I have noticed when running SDR# and SDRConsole V2 the I Q suppression doesn't quite get rid of the I Q spike when using SDRplay.
If I'm using a rtl-usb stick it's a non issue. Is there an issue with my SDRplay?
It's quite a hindrance when using SDRConslole and clicking on a frequency from memory.
Thanks,
Stan
Last edited by Stan on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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jon
Posts: 311
Joined: Tue Jan 06, 2015 10:48 am

Re: I Q Supression

Postby jon » Tue Aug 18, 2015 7:54 am

Hi Stan, I notice no-one (including us here at SDRplay) came back to you regarding the IQ spike. Hopefully, you will have found ways round it be now. Also for the benefit of others visiting the forum, here is our belated response...

What you describe sounds more like DC offset as opposed to I/Q imbalance. It is possible that your observations back in May predate the use of the ExtIO plugin when using SDR# - there was a short period before we moved to using EXTIO for SDR# when DC offset was a problem (due to changes made by the folks at SDR#) So this is definitely no longer a problem.

regarding use of SDR-Console, none of us here at SDRplay is an expert and we've actually found subtle questions as very well respoded to by the active SDRplay user community on https://www.facebook.com/groups/sdrplay/ (apologies to people who hate facebook!)

Alternatively please let us have more information/ screen shots at support@sdrplay.com

Jon

PS for HDSDR users there's a neat tutorial on the topic of IQ Imbalance on https://sites.google.com/site/g4zfqradi ... iq-balance
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F1BJB
Posts: 108
Joined: Wed Jul 15, 2015 4:24 pm
Location: Beauvais France

Re: I Q Supression

Postby F1BJB » Wed Aug 19, 2015 9:37 pm

Stan wrote:If I'm using a rtl-usb stick it's a non issue.

Hi
This depends of the RTL stick.
With the R820 tuner it is not.
With the ET4000 it is a problem.
On the other hand ET4000 has less and more prédictable spurious responses as it is zero IF.
HTH
Last edited by F1BJB on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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