Hi. I have construct this linear 500w rms (2kw pep) (50ohm) with 12 mosfet irfp360, http://tzitzikas.webs.com/linear500w.jpg schematic. The manufacturer and other radio amateurs from a greek forum ha
i will try to short all connections. what other changes do you propose to solve my problem? -- http://tzitzikas.site90.net (tzitzikas site) http://forum.tzitzikas.site90.net (tzitzikas forum) -- Most
hi. I would like to construct a Chebyshev 5-Element Low-Pass Filter for 1431 khz. I would like to use standar capacitor values, which are easy to find. My problem is to find how many turns with 2mm d
HI. i have constructed this linear amplifier 500w rms (2kw pep) (50ohm) with 12 mosfet irfp360, http://tzitzikas.webs.com/linear500w.jpg for 160m band. When i gave 3watts of driving r.f power, it gav
i mesured the r.f power with digital power/swr meter and it was only 190 W at 106VDC (6A current). The manufacter claims that at 500w output r.f power, at 110vdc, the current is 13A. So, the efficie
what do you mean with the phrase: <<The device substitution has possibly reduced the amplifier's gain and efficiency.>> . thank you -- http://tzitzikas.site90.net (tzitzikas site) http://forum.tzitzi
And how can i repair this problem??? You might consider imbalance in each side of the primary which will cause a net dc to pass, saturation and over-heating. This may be rubbish but it could get oth
hI, AND THANK FOR YOU ANSWER. DO YOU HAVE TO PROPOSE ANY PROPER MATERIAL OF FERRITE CORES FOR FREQUENCES 1-2MHZ? I saw AMIDON'S SITE: https://www.amidoncorp.com/categories/9 and i think 31 material i
Some additional photos from my linear: http://tzitzikas.webs.com/fet20.JPG http://tzitzikas.webs.com/linear20.JPG http://tzitzikas.webs.com/linear21.JPG http://tzitzikas.webs.com/linear22.JPG http://
hi. i am not use insulators between mosfet and heatsink in order to have the minimum thermal resistance. I am using only silicon thermal conductive paste to decrease the thermal resistance. So, the h
The linear have been constructed by me (if you mean the manufacter of linear amplifier). The prototype have been constructed by schematic designer and you can see a photo here: http://www.tzitzikas.w
Hi. All of my instruments are ok. This linear is only for 160m band and for bellow frequences (for tests only in dummy load). I have not test it at higher frequences and my pll exciter works maximum
do you mean to test at 1.2mhz with 67 material ferrite or the test at 67mhz and 1.2mhz with the same 43 material ferrite? I suggested replacing the broken core and testing at 67 and 1.2 MHz to see
i think that the proper material is 43 or 77 for frequences between 1-2mhz. i search in some internet sites and i found these: 31 Material A MnZn ferrite designed specifically for EMI suppression app
The linear have been constructed by me (if you mean the manufacter of linear amplifier). The prototype have been constructed by schematic designer and you can see a photo here: http://www.tzitzikas.w
for 1-2mhz operation, what kind of material do you propose? 31, 43 or 77 material??? Guys, the problem is more pernicious than that! The problem is in the way the transformers are WOUND! Efficient hi
the manufacturer who construct the prototype and use mica to the fets, propose to me. to not use mica, but to take the drain for the 6 fets from the heatsink. He told me just to use some thermal sili
hi. The manufacturer and another radio amateur claim that this linear amplifier which they have constructed works perfectly and stable, and gives 400w minimum r.f power at output stage (with 110vdc p
hi, i have construct this linear amplifier 500w with 12 mosfet irfp360 for 160m band: http://tzitzikas.webs.com/linear500w.jpg (schematic) The manufacturer and other amateurs who have construct the f
At driver linear: http://tzitzikas.webs.com/irf640-1.JPG i am using for outupt transformer the BN-43-3312 double ferrite (see here: https://www.amidoncorp.com/items/62 ) not 2 FB-43-7351 (see here: h