# Consultation on car radios and improve the sensitivity of my mobile radio

#### Gustav2021

Joined Nov 26, 2021
1

#### Yaakov

Joined Jan 27, 2019
4,023
Sensitivity is one parameter that bears on receiver performance. Alone it doesn’t tell much, and it can be manipulated. Useful sensitivity numbers will be reported in dB as some sort of SNR (Signal to Nose Ratio) related number.

A much more useful number is SINAD (Signal to Noise And Distortion) reported in dB. It is a systematic measurement that attempts to capture the effect of the entire receiver system on performance.

Sensitivity is one of two main parameters that are a concern, the other is selectivity. If you have a very highly sensitive receiver that can’t select the particular transmission you are interested in, it does you no good. Sensitivity and selectivity can be traded off, and manufacturers often choose to report things most apparently favorable to them.

So, look for SINAD numbers and selectivity figures to understand the actual performance of receivers, not one isolated number of dubious importance.

#### Audioguru again

Joined Oct 21, 2019
4,129
A car radio might cost $200 and a clock radio might cost$9. Which one do you think has a better more sensitive circuit?

#### hoppyest

Joined Nov 20, 2018
4

#### ronsimpson

Joined Oct 7, 2019
1,752
Most clock radio have little to no antenna and certainly do not have a ground plane for a antenna.

#### Audioguru again

Joined Oct 21, 2019
4,129
ALL half decent radios have Automatic Gain Control so that the radio works very close or very far from a station.
The only radio I have seen with a manual local-distant switch is my Sony Walkman.

Most of my clock radios have the power cord as its FM antenna and a ferrite bar inside for AM.