Author Topic: Phasing dots on Minicircuits ADTL1-4-75 RF transformer  (Read 359 times)

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Offline rfengg

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Phasing dots on Minicircuits ADTL1-4-75 RF transformer
« on: July 31, 2018, 05:20:11 pm »
The phasing dots on the Minicircuits ADTL1-4-75 RF transformer is driving me bonkers  |O


As per their data sheet at https://www.minicircuits.com/pdfs/ADTL1-4-75.pdf , the phasing dots on this transformer have both dots shown on the same winding.........what exactly does this mean?

Usually the phasing dots on a transformer give information on the winding direction of the coils , but what do two dots on the same winding mean?
 

Offline ArthurDent

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Re: Phasing dots on Minicircuits ADTL1-4-75 RF transformer
« Reply #1 on: July 31, 2018, 08:54:20 pm »
It all depends on the design and what the transformer is used for. Here are some examples. 
 

Offline Bud

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Re: Phasing dots on Minicircuits ADTL1-4-75 RF transformer
« Reply #2 on: July 31, 2018, 09:19:30 pm »
This is a transmission line transformer and the dots mark primary and secondary terminals which are in-phase. If you swap the secondary terminals your output voltage will be 180 degree out of phase vs input voltage. Note that there is no galvanic isolation in TL transformers between input and output. You should know where and how to use them.
 
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Offline ArthurDent

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Re: Phasing dots on Minicircuits ADTL1-4-75 RF transformer
« Reply #3 on: July 31, 2018, 09:38:13 pm »
Here's another picture with the phasing dots on the same winding. Google 'balun' and 'unbalanced to balanced'.
 
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