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"external" Bias-T for Antenna?

Posted: Thu Oct 03, 2019 9:22 pm
by Username
Hi
I ordered the here "promoted" Loop Antenna from China and the will arrive someday hopefully.
I just looking for an Bias-T who will be better than the included one. I have no power Suppply for so I will stick with a USB one.

How about that? https://www.ebay.de/itm/Bias-T-Bias-Tee ... Sw9apcHJqY
It start with 1Mhz on there Claim.

or this with a nice metal Case (to keep the noise out)?
https://www.ebay.de/itm/Bias-Tee-Wideba ... Swi6RbRPuB
But how to connect an USB Cable with?

Or this from Hungary who is next to my Country so shipping should not take to long:
https://www.ebay.de/itm/Bias-Tee-Wideba ... SwzqFY9haT

Re: "external" Bias-T for Antenna?

Posted: Mon Oct 07, 2019 9:12 am
by rtlsdrblog
Just to note we're not promoting that antenna, just posting news about it.

The second one might not be good, as the lower end is specified as 0.01 GHz, which is 10 MHz. The others specify operation down to 1 MHz.

If you have a RTL-SDR V3, try the bias tee on that too. It works fine.

Re: "external" Bias-T for Antenna?

Posted: Mon Oct 07, 2019 10:07 am
by Username
If you have a RTL-SDR V3, try the bias tee on that too. It works fine.
Nope because I use an Up converter from a Friend who need Power via SMA Port to. :D
So after that there is no Power for the Antenna.
And Ups I dont saw the say Ghz. :oops:

Re: "external" Bias-T for Antenna?

Posted: Mon Oct 07, 2019 9:28 pm
by bmh
Username wrote:
Thu Oct 03, 2019 9:22 pm
How about that? https://www.ebay.de/itm/Bias-T-Bias-Tee ... Sw9apcHJqY
It start with 1Mhz on there Claim.

I purchased one of these about a year ago and it caused spikes all over the bands. I tried different power sources, including a 5V battery, and it still did the same. I most likely got a defect but it was only $5 and took almost two months to arrive so it wasn't worth dealing with China over a warranty and I've never purchased another one to try out since. There are so many of these being sold and all of them look almost identical and almost all of them come from China yet their prices vary so much it's hard to figure out what is good and what isn't. Good luck with whatever you end up with. I make my own antennas and amplifiers now if it isn't something endorsed by a major SDR company. There are many schematics and blogs and videos all over the internet that can guide you into making your own components cheaply and with confidence that they will work.