Amateur Radio Stack Exchange
Amateur Radio Stack Exchange

Questions tagged [components]

Questions about electronic components used in radio or antenna construction.

Use this tag to indicate that your question is specifically related to the various electronic components that compose an antenna system or amateur radio set. You may also include tags related to specific components, such as , , etc.

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How to prevent cracking the capacitors in my diplexer?

Just made my first 2m/70cm diplexer. Important: I aim to be able to use this up to 50 Watts. S21 from the LP section: Having access to regular distributors such as Farnell/Element14, Mouser, Digikey,... I searched for RF capacitors with a voltage…
Dieter Vansteenwegen ON4DD
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Globar resistor repair or alternative(s)?

I am restoring a Hallicrafters S-120 receiver and when trying to unsolder the wires, from the electrolytic capacitor, I noticed that one of the terminals of the Globar resistor (880-100 Ohm / 023-00327) was loose. Common soldering practices to…
essential555
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Tradeoffs: varicap vs. air variable capacitor for Rx bandpass?

What might be the tradeoffs between choosing varicap diodes versus air variable capacitors in the design and construction of tunable bandpass filters for HF receivers?
hotpaw2
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How to select capacitor for diplexer use

Follow-up on this question: How to prevent cracking the capacitors in my diplexer? Short story: 2m/70cm diplexer, to be used up to 50W. Schematic from Elsie: S21/S11: I don't know exactly what to look for when choosing capacitors. Phils answer…
Dieter Vansteenwegen ON4DD
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Why is my homebrew copper sulphate resistor behaving like a capacitor?

I brewed a CuSO4 resistor in a glass jar. I got the idea from here. This was done by creating a solution of Copper Sulphate in distilled water. The lid on the jar was provided with a BNC socket into which copper leads were soldered that are immersed…
VU2NHW
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Narrow bandstop filter not requiring ground connection in SMD package

I’m designing an antenna that I’ll implement on a printed circuit board. The antenna will be working on both sides of 900 MHz, so it’s not exactly for ham use. I’m planning to use a bandstop filter in the antenna element, but because the two bands…
OH2FXN
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2GFSK digital filter bandwidth calculation

I'm working on a S2LP from ST and I am configuring the RX digital filter. I need to calculate the bandwidth of the signal which has 2GFSK modulation. Do you think the code below is correct for estimating the signal bandwidth for a given XO and a…
Victor
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