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Q&A

Posts tagged RF

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77%
+5 −0
Q&A Is there a way to reliably measure antenna return loss outside a lab?

Assume I'm a complete beginner at RF. Is there a way to measure return loss of an antenna, in such a manner that I can reliably reproduce the measurement later on? What I'm talking about is produ...

2 answers  ·  posted 1y ago by Lundin‭  ·  last activity 4mo ago by TonyStewart‭

75%
+4 −0
Q&A What effect will extreme temperatures have on impedance in a wire?

My scenario is this: radio equipment controlling an overhead crane inside a steel mill. Specifically it is used for transporting melting pots. With the current, unfortunate installation, the antenn...

1 answer  ·  posted 6mo ago by Lundin‭  ·  last activity 6mo ago by Olin Lathrop‭

72%
+6 −1
Q&A How to protect RF switches from ESD?

Assume that I have some generic antenna connector, followed by a pi-filter/50ohm impedance matching components, then a DC blocking cap (as per the RF switch recommendations) and then a RF switch fo...

4 answers  ·  posted 10mo ago by Lundin‭  ·  last activity 9mo ago by Nick Alexeev‭

Question RF esd rf-switch tvs
66%
+4 −1
Q&A How to calculate the RC filter of a TXCO for a RFIC reference?

I have a 30MHz TCXO circuit (TXCO datasheet) like this serving as local oscillator to a RFIC: The RFIC manufacturer recommends to "add filtering caps" for high RF output cases. That is &gt;20d...

1 answer  ·  posted 10mo ago by Lundin‭  ·  edited 10mo ago by Lundin‭

77%
+5 −0
Q&A Location of AGC in a superheterodyne RX chain

RF novice here. If using a superheterodyne receiver for the purpose of FM/FSK modulated signals, I'm wondering if the location of an optional automatic gain control (AGC) circuit is always placed o...

0 answers  ·  posted 11mo ago by Lundin‭

66%
+2 −0
Q&A Most correct term for radio switching noise?

I'm wondering what's the most correct term (if any) to use for "switching noise" of a radio transceiver? By that I mean the spikes that originate from turning the power amp on/off while switching b...

1 answer  ·  posted 1y ago by Lundin‭  ·  last activity 1y ago by Olin Lathrop‭

71%
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Q&A Why are antenna PCB traces square instead of rounded?

While doing some reading on RF designs I ran across this paragraph: I have never designed an RF circuit, but all the PCB trace antennas I have seen on development boards are square. For example,...

2 answers  ·  posted 1y ago by Kranulis‭  ·  last activity 1y ago by TonyStewart‭

Question PCB Antenna RF
62%
+3 −1
Q&A Microwave oven interfering with WiFi on the 2.4GHz band

As I understand it, microwave oven magnetrons operate at 2.45GHz, which is an unlicensed band in most of the world. When 2.4GHz technologies such as WiFi (802.11), Bluetooth and Zigbee were launche...

2 answers  ·  posted 2y ago by Lundin‭  ·  last activity 1y ago by TonyStewart‭

Question EMC RF wifi emi radio
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Q&A Filter RF Harmonics With Additional PI Network

I have a 900MHz radio with a reference design matching network. The radio feeds to a PCB antenna (PCB antenna hasn't been verified with a VNA, and may not be a great match; this is a project to n...

2 answers  ·  posted 1y ago by leroy105‭  ·  last activity 1y ago by leroy105‭

Question RF
60%
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Q&A Mixers and Audio Extraction in a DCR Architecture

I want to make a simple 7MHz direct conversion SSB receiver in order to materialize some RF concepts I have been teaching myself lately. My question revolves around the mixer portion. I'm failing t...

1 answer  ·  posted 2y ago by jm567‭  ·  edited 2y ago by jm567‭

Question RF Mixer
60%
+1 −0
Q&A Antenna Feed Line Question

Hello, I am designing 1/4 WL strip antenna for a bluetooth chip and i had some questions regarding the 50 Ohm feed line. Right now I am using a Nordic-recommended 1.5mm trace width and a 23mm + 4mm...

1 answer  ·  posted 2y ago by jm567‭  ·  last activity 2y ago by Olin Lathrop‭

Question Antenna RF