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December 10, 2016, 01:34:20 13:34


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Author Topic: Bias-T - how to calculate?  (Read 484 times)
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lifeguard
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« on: July 24, 2016, 04:05:47 04:05 »

Hi!
Is there any online tool or formula to calculte inductor and capacitor for Bias-T? I would like to build a Bias-T power insert to feede DC to my LNBF, with runs on 12~20v DC and frequency that I plan to use is abiut 1.5ghz (L-Band). How can I calculate the correct inductor and capacitor for this?
Just to be clear: I want to build Bias-T for power insert at receiver side, not LNBF (which alread has Bias-T internal).

Tks!
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bobcat1
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« Reply #1 on: July 24, 2016, 09:43:32 09:43 »

Hi Lifegurard

Coilcraft is manufacturing special inductors for bias-T  seach there site for design application note and more information

All the best

Bobi
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bigtoy
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« Reply #2 on: July 28, 2016, 06:11:56 06:11 »

There's a calculator here; don't know if it meets your needs:
http://k6vhf.com/bias-tee-calculator/
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lifeguard
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« Reply #3 on: July 28, 2016, 01:40:10 13:40 »

There's a calculator here; don't know if it meets your needs:
http://k6vhf.com/bias-tee-calculator/

Tks!
I found this calculator a couple of days. How do I choice ratio? I mean, When I choice 10, 100, 1000? How this will affect bias-t working or attenuation?
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vern
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« Reply #4 on: July 28, 2016, 01:53:34 13:53 »

Here is another one, you just have to pick an amplifier with the right current
http://www.changpuak.ch/electronics/mar_era_bias.php
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lifeguard
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« Reply #5 on: August 04, 2016, 12:05:55 00:05 »

Here is another one, you just have to pick an amplifier with the right current
http://www.changpuak.ch/electronics/mar_era_bias.php
That's a great tool! Very usefull when you're building you amp. But in my case, I'm using an LNBF and I don't have any idea what kind of Amp and model are in. It's an dish LNBF, more specific a Titanium LNBF for C-Band.
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vern
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« Reply #6 on: August 09, 2016, 11:31:16 23:31 »

on the Titanium web site there is the C1PLL-C band LNBF, it says in the datasheet current 145mA max.
With the bias calculator take the LHA-1H+ amplifier, it uses 108mA, it is the highest value in that calculator.
If you have the resistor value for that one just take off about 25%, that should be the right resistor value for 145mA.
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