Squelch chirp SDS100

KAUC1632

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Has anyone else noted an annoying squelch chirp from the SDS 100? More prevalent on VHF but now starting to hear occasionally on various Trunked frequencies.

JD
 

KAUC1632

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analog primarily but just noticed today on a digital rescue call. First time on digital.
 

Ubbe

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When you mention squelch chirp, it only happens at the end of conversations when a user stops transmitting?

The SDS100 handles the analog audio in a digital way and it will be delayed some 100-200mS but the squelch function have no delay so it will clip off the last 100-200mS from the audio and remove the squelch tail. Sometimes at the start of transmisisions it will create a bit of a chirp or similar sound in the audio that could come from unmuting too early. But that's at the start of transmissions.

/Ubbe
 

jonwienke

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If you're hearing more than a brief "tick" at the end of transmission, it's probably the system you're listening to, not the radio.
 

W4EMS

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Yep. That let's other users know the person transmitting has unkeyed. Ham repeaters not infrequently have this setting enabled especially when several repeaters are linked.
 

KAUC1632

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When you mention squelch chirp, it only happens at the end of conversations when a user stops transmitting?

The SDS100 handles the analog audio in a digital way and it will be delayed some 100-200mS but the squelch function have no delay so it will clip off the last 100-200mS from the audio and remove the squelch tail. Sometimes at the start of transmisisions it will create a bit of a chirp or similar sound in the audio that could come from unmuting too early. But that's at the start of transmissions.

/Ubbe
On the digital transmission it happens at the beginning of the transmission and only occasionally but with an annoying intensity compared to the rest of the transmission.
 

Ubbe

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On the digital transmission it happens at the beginning of the transmission and only occasionally but with an annoying intensity compared to the rest of the transmission.
If it happens on conventional channels where you have set the mode to both analog and digital it probably can be solved by setting the digital delay to 200mS. If it happens in pure digital mode there's probably nothing to do about it. It is the result of the hardware and software design that where choosen to be used.

/Ubbe
 
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