Toggle sidebar Toggle sidebar
  • You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

IRF520A


I do not have a peak at the moment, I am getting about 35-40 watts average on a Bird. Just wondering if this would be considered reasonable or acceptable.
 
Crusher said:
I do not have a peak at the moment, I am getting about 35-40 watts average on a Bird. Just wondering if this would be considered reasonable or acceptable.
Click to expand...



Are you sure its tuned correctly? What is your bias voltage? I get 400 pep out of 16 irf-520s,works out to around 25 pep per mosfet on mine.I have my bias voltage set at 4 volts.
 
Dirtywhiteboy, I biased amp so that it would draw 40mA. That is 10mA per transistor. I originally biased circuit for 4.5 volts. But I found out that it is not long before replacing mosfets. I used part of design from the Ranger 94VHP. Also took a few ideas from the ARRL Amp Classics book section on mosfets using the 510 and 511's. Between the 2 this gave me a good place to start. I can't believe it only took about 160pF cap. across the output transformer. I usually am used to using something like 5 or 6 times larger.
 
GRTS, Galaxy has a model called 98VHP. It has 8 IRF520's as final section. Might want to take a look at that as well. Going to try a few other projects with IRF550's and IRF35X series. Anyone know how I can post a pic of this project?
 

dxChat
Help Users
  • No one is chatting at the moment.
  • @ BJ radionut:
    +1
  • @ heartbreaker3473:
    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
  • @ AudioShockwav:
    Wes, it's better if you start a thread on the main forum, more people are going to see your question.
  • @ heartbreaker3473:
    Okay, sorry, will put in a forum
  • @ heartbreaker3473:
    I put it in the general disscution help area and started a new thread. Thank you for letting me know.


      Top Bottom