RSPduo Bias-T

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safuser
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Joined: Sun Jun 17, 2018 2:41 pm

RSPduo Bias-T

Post by safuser » Sun Jun 17, 2018 2:45 pm

I have an RSPduo and am trying to drive a lna4all at the antenna with the built in Bias-t. I am not getting any voltage out of the RSPduo on Tuner 2 port when I have Bist-t selected in SDRuno so I am unable to drive the lna4all? Please advise?
Last edited by safuser on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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g1hbe
Posts: 494
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: RSPduo Bias-T

Post by g1hbe » Sun Jun 17, 2018 4:46 pm

It's worth checking to see if the voltage is appearing at the tuner 1 port instead. The rsp2 suffered from swapped-over ports a few months ago and it caused great confusion!

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Andy

Mike2459
Posts: 318
Joined: Mon Jul 24, 2017 8:24 pm

Re: RSPduo Bias-T

Post by Mike2459 » Mon Jun 18, 2018 1:49 am

LNA4ALL.JPG
LNA4ALL.JPG (45.51 KiB) Viewed 10926 times
The RSPDuo's Bias-T outputs 5 volts@100ma. Some versions of the LNA4All have their own on board 5 volt regulator and require a 6 to 9 volt Bias-T supply. Another version can operate with a 3.3-5V Bias-T according to the LNA4all website. http://lna4all.blogspot.com/. Was a spec sheet included with it?

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Mike2459
Posts: 318
Joined: Mon Jul 24, 2017 8:24 pm

Re: RSPduo Bias-T

Post by Mike2459 » Mon Jun 18, 2018 2:29 am

Sorry I think I misunderstood your question in the preceding reply.

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sdrplay
Posts: 978
Joined: Wed Jan 07, 2015 7:58 am

Re: RSPduo Bias-T

Post by sdrplay » Mon Jun 18, 2018 5:32 am

Please confirm what the configuration is in SDRuno when you are seeing no voltage. If it's when the tuner 2 is the slave, then that's an issue we are looking into. Please try other configurations such as tuner 2 in single tuner mode and making tuner 2 the master in master/slave mode.

If you are able to confirm which of these modes you are having a problem with in a ticket (https://www.sdrplay.com/support) we'll be able to confirm that it is a software issue or not.

Best regards,

SDRplay Support

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