Adding "Chicken Burst" to the Shari PiHat

[ky0l]

The squelch tail is very noisy with my Baofang UV-K5 Plus and Baofang UV-25 radios. The squelch tail that I'm talking about is when the Shari PiHat SA-818 transistions from transmitting PL to stop transmitting, and the loud squelch crash is heard on the Baofang portable transceiver. I think that adding "Chicken Burst" would quiet the squelch tail noise.

I'm pretty sure that the correct term is "Chicken Burst". Chicken Burst is when you transmit PL on a radio, then when you unkey the transmitter, the PL sound stops immediately, but the transmitter hangs for a half second to one second, transmitting with no audio. Reverse Burst is used to decrease the squelch noise because it stopped the PL decoder reeds from vibrating. However, Reverse Burst doesn't work on the solid state PL decoders. The "Chicken Burst" does work on solid state PL decoders, and sounds like turning down the volume very fast, making the squelch tail sound very quiet.

I experimented with "Chicken Burst" decades ago, adding it to a Communication Specialists PL encoder with an Icom IC-2AT portable. The "Chicken Burst" silenced the squelch tail on a repeater's receiver.

I think that "Chicken Burst" would be a useful feature that could be added to ASL3 or SA818 to quiet the squelch tail. All that would be needed is a parameter that would add hang time for the SA818 transmitter with no PL tone on that hang time. If the PL tone frequency was changed just for the hang time period, that would probably work too.

Adding "Chicken Burst" was easier to do decades ago, when PL encoders had to be added to radios, and were not part of the radio design. You could then turn off the PL encoding during the hang time, or change the tone just for the hang time.

Would it be possible to add the option to have the "Chicken Burst" option in the ASL3 code or SA818 code?

[Mason10198]

@Mason10198

@Mason10198

Chinese radios such as Quansheng have an audible squelch crash on their receive, regardless whether using CTCSS w/ reverse burst or chicken burst

Chicken burst will not help. Most of these Chinese radios all use the following logic when CTCSS/DCS is enabled on RX:

• Unmute speaker when signal level is above squelch threshold AND correct tone is detected
• Mute speaker ONLY when signal level falls below squelch threshold

Thus, the loss of CTCSS tone does not mute the radio speaker, and the squelch crash is still heard when the carrier drops.

Loud squelch Tail Quansheng

I am using asl3 and a SA818 allstar node. The handheld radio I use is a Quansheng UV-5R Plus. Whenever the all-star node unkeys, there is a loud crash from the squelch on the Quansheng. I have set the squelch tail in als3 to 4s Hangtime = 400 I have also enabled the STE (squelch tail eliminator) on the Quansheng I have tried turning the squelch level up, but this still doesn't help. None of this has worked. It is even worse when I turn the volume up to listen to a station with a low audi…

[N8PC]

if you are using simpleusb on your allstar node then make sure in there you have PL Filter turned on and add in DCS Filter and turn it on. this will help filter it so it either stops it or at least lowers it. give it a try

[N2DYI]

The SHARI (SA818) does not properly respond to, or emit the correct tone for DCS. So, you'll still get squelch crashing in both directions if using simpleusb, where there is currently no delay line, which kinda defeats the purpose of DCS.
DCS is supposed to always end with either a 134 Hz or 268 Hz tone. 134 Hz is much more common, but both will work.
However, when tail tone is open on the SA818, regardless of DCS or CTCSS, it puts out a 59 Hz tone at the end of transmissions. Baofengs and many other Chinese radios like 55 Hz to mute receiver audio with or without CTCSS. They usually handle DCS a little better than the SA818 does, though.

You could possibly make something happen with usbradio if you have a V5.5 firmware SHARI, and the high pass filter disabled on the radio. This won't work with earlier firmware revisions, since the high pass filter can't properly be disabled on those radios due to a firmware bug.

[k5jr]

I swear that ASL supports Chicken Burst in the usbradio and simpleusb configuration files TX settings. I was particularly surprised that it does. It's not the default, however.

Mike / K5JR

[Mike]

@k5jr

I swear that ASL supports Chicken Burst in the usbradio and simpleusb configuration files TX settings. I was particularly surprised that it does. It's not the default, however.

txtoctype=no	; Transmit tone control type: no,phase,notone
			; no - CTCSS tone encoding with no hang time
			; phase - encode CTCSS and reverse phase
			; AKA ("reverse burst") before unkeying TX
			; notone - encode CTCSS and stop sending tone before unkeying TX
			; AKA ("chicken burst")