Andrew
  • Member for 3 years, 3 months
  • Last seen this week
  • Melbourne VIC, Australia
3 answers
19 votes
3k views
4 bookmarks
Why do amateur radio operators call an RF choke a balun?
3 answers
11 votes
3k views
How can I get rid of RFI coming from my house solar panel inverter?
1 answers
7 votes
129 views
Where exactly does atmospheric noise (QRN) come from?
4 answers
7 votes
1k views
1 bookmarks
How can the voltage at the center of a resonant half wave dipole be zero if the input impedance is 75 ohms?
2 answers
6 votes
239 views
1 bookmarks
For a resonant 1/2 wave dipole, does the reflections being in phase with the applied signal cause the zero reactance seen in the feedpoint impedance?
2 answers
5 votes
308 views
1 bookmarks
Does a loop antenna have less susceptibility to atmospheric noise than an open ended antenna?
5 answers
4 votes
678 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 answers
4 votes
338 views
Does the output of a BFO for a short wave receiver have to be exactly a sine wave?
3 answers
4 votes
2k views
1 bookmarks
Vertical Yagi spun at 1000 RPM: gain properties?
1 answers
4 votes
188 views
Identification of valve
1 answers
4 votes
251 views
Will painting a 4 element 10 m yagi using conductive paint onto the side of a building work?
1 answers
4 votes
390 views
Does an antenna tuner remove standing waves from a transmission line?
4 answers
4 votes
945 views
Why does an RF Amplifier fail when the SWR is high?
1 answers
3 votes
76 views
1 bookmarks
Can I use a directional coupler to block reflected AC current from a mismatched antenna?
2 answers
3 votes
221 views
Dual Polarization Yagi Antenna for 10 m
2 answers
3 votes
283 views
What is the main source of error for SWR meters?
3 answers
3 votes
416 views
Confusion about dipole standing waves and feed point impedance
5 answers
3 votes
230 views
Can I use a 1/4 wave decoupling stub to enable mounting of a vertical yagi on a metal pole?
1 answers
3 votes
124 views
How can i adjust the IF strip in a single conversion SSB receiver which has a product detector?
2 answers
3 votes
362 views
What are the advantages for a receiver that uses an IF compared to direct conversion?
4 answers
3 votes
171 views
Ham operators often tell me that comparing gain to an isotropic radiator isn't much use because it's only a theoretical antenna, is this true?
3 answers
3 votes
2k views
What happens to a vertical Yagi when you mount it on a vertical metal pole?
4 answers
3 votes
356 views
What is the voltage on a half wave dipole measured with respect to?
1 answers
2 votes
186 views
Are amateur radio operators more likely to get cancer from exposure to RF?
6 answers
2 votes
711 views
For a half wave dipole antenna, what's the value of the reactances that cancel out when the antenna is resonant?
2 answers
2 votes
139 views
Why do ham radio operators say that a full wave dipole isn't resonant?
1 answers
2 votes
96 views
Why don't the traveling waves on a dipole go back down the transmission line?
1 answers
2 votes
137 views
Does SWR change along the length of a transmission line?
4 answers
2 votes
562 views
Does a resonant antenna work better than a non-resonant antenna?
1 answers
2 votes
78 views
1 bookmarks
Is there a way to get FreeDV output level to follow the input audio amplitude?