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How do you probe amplifier outputs...

A resistor in series with that 10pf cap will extend the upper power limit. It's a compromise. Make the resistance too high and bareftoot radios won't produce decent output to the 'scope. Too low and you roast the diodes. This is probably the only application where I would recommend a carbon-composition resistor.

73
 
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nomadradio said:
A resistor in series with that 10pf cap will extend the upper power limit. It's a compromise. Make the resistance too high and bareftoot radios won't produce decent output to the 'scope. Too low and you roast the diodes. This is probably the only application where I would recommend a carbon-composition resistor.

73
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Mr. NomadRadio has spoken... :)
 
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nomadradio said:
A resistor in series with that 10pf cap will extend the upper power limit. It's a compromise. Make the resistance too high and bareftoot radios won't produce decent output to the 'scope. Too low and you roast the diodes. This is probably the only application where I would recommend a carbon-composition resistor.

73
Click to expand...
A resistor array switch could be added for variable power ranges right?
 
doffo said:
Mr. NomadRadio has spoken... :)
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Screenshot_20251231-081401~2.jpg

Chris has been doing this for a long time.

73
Jeff
 
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  • @ 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.


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