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Andrew
  • Member for 3 years, 9 months
  • Last seen this week
  • Melbourne VIC, Australia
11 votes
3 answers
4k views

How can I get rid of RFI coming from my house solar panel inverter?

3 votes
3 answers
3k views

What happens to a vertical Yagi when you mount it on a vertical metal pole?

19 votes
3 answers
3k views

Why do amateur radio operators call an RF choke a balun?

5 votes
2 answers
2k views

Can I use speaker wire as a transmission line?

2 votes
2 answers
2k views

Why does a Class-C non-linear power amp distort SSB but does not distort AM?

4 votes
3 answers
2k views

Vertical Yagi spun at 1000 RPM: gain properties?

0 votes
2 answers
1k views

What is the theoretical and actual cross polarization attenuation from horizontal to vertical polarization?

0 votes
1 answer
1k views

What EXACTLY does front to back ratio mean?

7 votes
4 answers
1k views

How can the voltage at the center of a resonant half wave dipole be zero if the input impedance is 75 ohms?

1 vote
1 answer
1k views

How does a gamma match on a dipole work as a balun?

4 votes
4 answers
1k views

Why does an RF Amplifier fail when the SWR is high?

1 vote
1 answer
1k views

Which polarization for a Yagi antenna will have the best side rejection for received signals with vertical polarization?

1 vote
2 answers
977 views

Exactly why do some SWR meters give a changing reading depending on the length of coax used to connect to an antenna?

2 votes
6 answers
845 views

For a half wave dipole antenna, what's the value of the reactances that cancel out when the antenna is resonant?

0 votes
2 answers
794 views

Does a horizontally polarised yagi antenna have the same front to back ratio for horizontal and vertical received signals?

0 votes
1 answer
762 views

Is it legal to transmit scrambled or encrypted voice via SSB on ham bands?

4 votes
5 answers
745 views

How can the impedance of a half wave dipole at its resonant frequency be purely resistive when the voltage and current are seemingly not in phase?

2 votes
4 answers
682 views

Does a resonant antenna work better than a non-resonant antenna?

1 vote
3 answers
660 views

How does the Maximum Power Transfer Theorem relate to RF power amplifiers?

5 votes
2 answers
497 views

Does a loop antenna have less susceptibility to atmospheric noise than an open ended antenna?

3 votes
3 answers
481 views

Confusion about dipole standing waves and feed point impedance

0 votes
3 answers
453 views

How can a vertical Yagi for 10 m be mounted on on a vertical metal mast and be made to work properly? [duplicate]

-2 votes
2 answers
442 views

How can a half wave dipole which has an impedance of 73 + j43 ohms ever be resonant?

-5 votes
4 answers
433 views

Exactly what is the cause for the zero reactance seen in the impedance at the center feed point of a resonant half wave dipole?

4 votes
2 answers
407 views

Does the output of a BFO for a short wave receiver have to be exactly a sine wave?

3 votes
4 answers
404 views

What is the voltage on a half wave dipole measured with respect to?

1 vote
3 answers
400 views

Does the impedance along a transmission line change when there are standing waves?

4 votes
1 answer
393 views

Does an antenna tuner remove standing waves from a transmission line?

4 votes
2 answers
389 views

What are the advantages for a receiver that uses an IF compared to direct conversion?

2 votes
3 answers
380 views

Are standing waves on a transmission line RF or DC?