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Results tagged with electronics
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user 8717
Questions which involve the properties or applications of individual electronic components.
6
votes
Accepted
Why are germanium diodes specified in amateur radio designs?
The lower forward voltage drop (0.3 volts or even less), compared to silicon diodes (0.7 volts or more).
Having said that, there are some schottky diodes with a low forward voltage drop, too.
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0
votes
Conventional or electron current
Here is a simple way of understanding this.
In vacuum tubes, we have a heated cathode (filament) which emits negatively-charged electrons. And those electrons are attracted to the positively-charge …
- 8,174
2
votes
What are some equivalents of a BF199 transistor?
A 2N5109 will work just fine.
Datasheet here.
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1
vote
Is it practical to use a slug-tuned variable inductor in an antenna matcher (aka "antenna tu...
Is it practical to use a slug-tuned variable inductor in an antenna matcher (aka “antenna tuner”)?
As far as I have been able to determine after countless exhaustive searches, I believe that the …
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3
votes
Is it practical to use a slug-tuned variable inductor in an antenna matcher (aka "antenna tu...
Electronics and radio surplus companies often have them. And have you looked on eBay? I've seen some real bargains from time to time! …
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3
votes
Why is coax loss logarithmic?
You are mixing units.
In the case of the wire, you specify resistance. But dB refers to power, not resistance.
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1
vote
Why does an RF Amplifier fail when the SWR is high?
When an amplifier of a fixed output impedance (50 ohms) is tuned for minimum VSWR into a load (your antenna), then maximum power is transferred from that device to be radiated into the ionosphere.
L …
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2
votes
Why does a Class-C non-linear power amp distort SSB but does not distort AM?
Trying to feed an SSB (or AM) signal to the gate or grid of a Class C amplifier will only produce an output on SSB peaks, which severely distorts the signal. And at the same time, out-of-band products …
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4
votes
ARRL handbook as a reference for all your radio learning needs?
While it is useful to have, NO single book contains everything that you want or need to know.
Note that the ARRL Handbook is published every year, and each year contains different information. But ev …
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3
votes
How is working on DC high voltages as in a tube radio different from 120VAC?
800 volts is far more likely to burn you. Just doubling the voltage from 120 to 240 will quadruple the power heating your flesh.
This is just basic Ohm's Law: [P=E*I]
DC is one nasty customer:
I …
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