Andrew W.
  • Member for 6 years
  • Last seen more than 2 years ago
What are the legal requirements for an amateur radio satellite?
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4 votes

As far as I can tell, the IARU attempts to regulate which amateur satellites use which amateur bands to transmit, who in turn coordinates transmission with the ITU. Most countries have signed treaties ...

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Is there a lower limit to the usable frequency for PCB 'stripline' feedline?
Accepted answer
3 votes

Microstrips should in theory work just fine at low frequencies, as Z0 is independent of f. The advantage of microstrip technology becomes clear at high frequency when it is practical, and often easier,...

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How to feed an array of dipoles for an end-fire pattern
1 votes

Short answer: For an array of dipoles with equal spacing $d$, the direction of maximum gain with respect to the end-fire direction (call this $\theta_0$) can be obtained using the following equation: ...

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Building an IQ mixer using an in-phase LO splitter
1 votes

Sure, this will perform the same function as a 90 deg hybrid -> mixers -> combiner. The diagram you show will perform the rejection in the hybrid, while the other arrangement would perform the ...

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Choosing a type of array antenna
1 votes

I want to design a steerable beam array antenna which has 15 dBi directivity using uniform fed infinitesimal dipole elements at 1GHz frequency occupying physical aperture. Array elements cannot be ...

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