RSP1 susceptibility to a DC voltage on its input?

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rob2396
Posts: 5
Joined: Fri Dec 16, 2016 7:11 pm

RSP1 susceptibility to a DC voltage on its input?

Postby rob2396 » Tue Jun 13, 2017 7:10 pm

I have a requirement to inject a DC voltage via a BIAS T, to support in line coaxial amplifiers. Will the RSP1 accept any DC voltage on its input and if not will an inline DC coaxial blocker solve the problem?

Regards

Rob.
Last edited by rob2396 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Tech_Support
Posts: 203
Joined: Mon Jun 01, 2015 7:00 pm

Re: RSP1 susceptibility to a DC voltage on its input?

Postby Tech_Support » Tue Jun 13, 2017 9:42 pm

Hello Rob,
The RSP1 has an AC coupled input as shown here:

http://www.sdrplay.com/docs/SDRplay_RSP ... s_r2p3.pdf

You will not have problems applying a DC voltage to the RF input.

Sincerely

SDRplay Tech_Support

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g1hbe
Posts: 217
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire

Re: RSP1 susceptibility to a DC voltage on its input?

Postby g1hbe » Wed Jun 14, 2017 10:33 am

Just to play devil's advocate! I'd be wary of building any bias-T without a DC blocking cap on the receiver side. It may be OK for the RSP1, but if you get into the habit of using a DC-coupled bias-T you may absent-mindedly attach it to something that is NOT AC coupled and then you'd be in trouble. Just think if you bunged it on your expensive spectrum analyser or similar!
If you are building a bias-T, I'd recommend just putting a 10n 63v cap in the signal line to the output just to play safe.

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Andy

rob2396
Posts: 5
Joined: Fri Dec 16, 2016 7:11 pm

Re: RSP1 susceptibility to a DC voltage on its input?

Postby rob2396 » Wed Jun 14, 2017 3:21 pm

To Tech Support and g1hbe: Thank you for the information, it was a great help and given me more thought on the subject.
Regards
Rob.
Last edited by rob2396 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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