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Adjustable Matching Transformer Exist ??

Posted: Tue Aug 20, 2019 2:44 pm
by TomLine
Is there such a thing as a variable matching transformer. Just hook it up and adjust for best signal? Is an Antenna Tuner the same thing?

Re: Adjustable Matching Transformer Exist ??

Posted: Fri Aug 23, 2019 12:57 am
by rtlsdrblog
Yeah that's an antenna tuner.

But remember that by matching impedance you're only affecting SWR. Things like radiation patterns and antenna gain are also dependent on proper antenna sizing.

Re: Adjustable Matching Transformer Exist ??

Posted: Sat Aug 24, 2019 7:07 pm
by snn47
Yes impedance matching circuit/transformer exist.
The problem is you have to place such a device directly between the antenna and the transmission line e.g. coax cable to work. Then you have to tune it to the frequency you want to operate on, and again after you change the frequency.

This requires some means of remotely tuning the components uses in such a impedance matching circuit/transformer

Re: Adjustable Matching Transformer Exist ??

Posted: Sun Aug 25, 2019 2:32 pm
by radiolistener
rtlsdrblog wrote:
Fri Aug 23, 2019 12:57 am
But remember that by matching impedance you're only affecting SWR.
antenna tuner also can be used as pre-selector tunable bandbass filter

Re: Adjustable Matching Transformer Exist ??

Posted: Sun Aug 25, 2019 6:48 pm
by snn47
antenna tuner also can be used as pre-selector tunable bandbass filter
It depends on the design of the matching network if it can be used as pre-selector tunable bandbass filter, e.g a Pi-design is a Low pass filter.