Mysterious mosfet SRF261 from FREESCALE 300w

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rigmo
no manz can test innit
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Mysterious mosfet SRF261 from FREESCALE 300w

Post by rigmo » Sun Apr 18, 2021 9:36 am

Hi I just make experiment with mystirus freescale mosfet popular called SRF261
I get fine tune and result is very good... for the moment is not broadband board.. but is not important for the this task / request (If we wanted broadband... we must forget the higher efficiency....)

This PLL drive board is best i see on market.. 0/6W without harmonics... and also almost a flat power through scale 88/108

26.5V
13.8A
300W RF OUT
1.25W RF drive
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Last edited by rigmo on Sun Apr 18, 2021 10:01 am, edited 3 times in total.

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Bton-FM
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Re: Mysterious mosfet SRF261 from FREESCALE 300w

Post by Bton-FM » Sun Apr 18, 2021 2:56 pm

Nice work!

Could you share the schematic? I’d be interested to try this.

What is the efficiency like if the circuit is board band?

I could swear that driver used an all in one chip for the oscillator but maybe the design has been changed

radium98
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Re: Mysterious mosfet SRF261 from FREESCALE 300w

Post by radium98 » Sun Apr 18, 2021 7:16 pm

Good work rigmo

rigmo
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Re: Mysterious mosfet SRF261 from FREESCALE 300w

Post by rigmo » Wed Apr 21, 2021 8:50 pm

Bton-FM wrote:
Sun Apr 18, 2021 2:56 pm
Nice work!

Could you share the schematic? I’d be interested to try this.

What is the efficiency like if the circuit is board band?

I could swear that driver used an all in one chip for the oscillator but maybe the design has been changed
is not so much difference then for mrf9810. Each tune matching is individual... nothing special / secret..
standard protocols..
start with 0v BIAS... lover drive and PSU voltage... calculate efficiency i fined best match. lower then 75% is not good at all...

rigmo
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Re: Mysterious mosfet SRF261 from FREESCALE 300w

Post by rigmo » Fri Apr 23, 2021 6:17 pm

LPF support up to 600W
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radium98
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Re: Mysterious mosfet SRF261 from FREESCALE 300w

Post by radium98 » Fri Apr 23, 2021 9:48 pm

wonderful rigmo

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