tzitzikas
Junior Member level 2
HI. i have constructed this linear amplifier 500w rms (2kw pep) (50ohm) with 12 mosfet irfp360, https://tzitzikas.webs.com/linear500w.jpg for 160m band.
When i gave 3watts of driving r.f power, it gave to output only 190w at 106VDC (6A current). Two radio amateurs who have construct this linear claim tha it gives 500w
r.f power at 110vdc.
But when i tried to give 4watts of driving r.f power the ferrite Cores (43 material)
of transformer T3 broken! Which do you think is the problem??
some pictures
https://tzitzikas.webs.com/linear20a.JPG
https://tzitzikas.webs.com/ferrite_broken1.JPG
https://tzitzikas.webs.com/ferrite_broken2.JPG
the feerite cores that i use are:
https://uk.farnell.com/fair-rite/2643626402/ferritecore-196ohm/dp/1463423
from manufacter:
https://www.fair-rite.com/cgibin/ca...ound+Cable+EMI+Suppression+Cores#select:freq1
Round Cable EMI Suppression Cores
Broadband Frequencies 25-300
MHz (43 material)
some radio amateur told me that maybe this cores are improper for these frequences. But the designer of this linear
claims that we must use 43 material cores for the transformers.
from amidon site:
43 Material Round Cable Beads
* > Round Cable Beads
Suppresses 25 to 300 MHz
31 Material Round Cable Beads
* > Round Cable Beads
31 material. Good for 1 to 300 MHz
77 Material Round Cable Beads
* > Round Cable Beads
Great for RFI in 2 to 30Mhz range
Thank you.
When i gave 3watts of driving r.f power, it gave to output only 190w at 106VDC (6A current). Two radio amateurs who have construct this linear claim tha it gives 500w
r.f power at 110vdc.
But when i tried to give 4watts of driving r.f power the ferrite Cores (43 material)
of transformer T3 broken! Which do you think is the problem??
some pictures
https://tzitzikas.webs.com/linear20a.JPG
https://tzitzikas.webs.com/ferrite_broken1.JPG
https://tzitzikas.webs.com/ferrite_broken2.JPG
the feerite cores that i use are:
https://uk.farnell.com/fair-rite/2643626402/ferritecore-196ohm/dp/1463423
from manufacter:
https://www.fair-rite.com/cgibin/ca...ound+Cable+EMI+Suppression+Cores#select:freq1
Round Cable EMI Suppression Cores
Broadband Frequencies 25-300
MHz (43 material)
some radio amateur told me that maybe this cores are improper for these frequences. But the designer of this linear
claims that we must use 43 material cores for the transformers.
from amidon site:
43 Material Round Cable Beads
* > Round Cable Beads
Suppresses 25 to 300 MHz
31 Material Round Cable Beads
* > Round Cable Beads
31 material. Good for 1 to 300 MHz
77 Material Round Cable Beads
* > Round Cable Beads
Great for RFI in 2 to 30Mhz range
Thank you.