Top new questions this week:
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I'm trying to get my head around IQ modulation. What I understand so far is that each of the I and Q branches of the mixer produce two sidebands with the same frequency components, but in the Q branch,...
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I'm building a vertical antenna. The lowest portion of its element consists of 3/4" type M copper pipe, with end caps that will be soldered on and 3/8-24 screws poking through at both ends (so ...
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I want to install this miracle program on my smartphone in order to get more mobility.
I found such a solution exists:
https://github.com/bastibl/gnuradio-android
However, I could not do everything as ...
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I submitted an application for a vanity call sign a little over 18 days ago, and it's marked "pending". I presume that it will be processed soon, but the FCC's ULS search page is being slow ...
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While programming my Icom radio it has MR (memory)channels, VFO (Variable Freq) channels and Call Channels. What are call channels as comparred to memory or vfo channels? What is their use?
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I am in kindergarten with 4NEC2 and trying to model a Gray-Hoverman TV antenna. I have someone else's model and understand most of the file parameters. I have added VHF elements that have S curves at ...
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I recently learned that these fancy modern ultra-low noise MMIC, while having <1dB noise figure around 1Ghz could be quite bad at low frequencies due to 1/f noise.
What is lowest noise MMIC then ...
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Greatest hits from previous weeks:
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I wonder, even in this modern generation why the outdated vacuum tubes are used. In other electronic circuits they have been replaced by more efficient (and small) transistors years ago. Why they are ...
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Reading through an RF power amplifier datasheet, I found the sheet only referenced dBm output power, rather than watts.
What is dBm?
How do I convert it to watts?
Why, or when, would you use dBm to ...
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If I only have the budget for one HF antenna, should I chose a vertical or a horizontal antenna?
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I am rather new to HF operation and have recently purchased my first HF rig. I have read about bands being "open" and "closed" based on various conditions including time of day. As I have been ...
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Looking at amateur radio forums and email threads, oftentimes amateur radio operators will use "73" or "73s" where one might otherwise expect to find "Sincerely" or "Regards". Why?
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Does anyone know what the spacing between elements on a beam antenna should be? I built a 146 MHz 3 element beam following instructions, and the spacing was 16" between the driven element and the ...
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I'm using an Anroid app for learning CW. In Germany, it's common to define the speed in CPM ("characters per minute", or German BPM for "Buchstaben pro Minute).
However, the Morse trainer I use ...
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Can you answer this question?
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I'm playing with Nodered that I'm trying to use to place an aprs object: it works but it does not suit me!
No error on findu.com, correct display of frames on aprs.fi or on aprsdirect.com ... but on ...
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