Volker Tonn wrote:

dx'tard wrote:

That is correct. So... plugging the radio into a better speaker will therefore not
help... unless the high pass filter is disabled.

Most VHF/UHF receivers are not having a highpass filter going so high
(300Hz) but only to about 55 Hz in Europe or 65 Hz in US because of the
mains freqs. It's only the transceivers wich are using these tones
having the freqs up to 300Hz blocked to the AF-stage.
It's simple enough to tap the discriminator output on the RX-section of
nearly any (T)RX.
I have a handheld scanner provinding the CTCSS-tones just out of the
headphone jack. The built-in speaker is too tiny to go below 150Hz.
BTW the higher tones above 150Hz are not used very often.

Thanks Deutsche'tard.