Whistler for clean CSQ squelch tail elimination hands down.
I own and use both Uniden, Whistler, and commercial Motorola gear for amateur / business use.
As mentioned above, for the widest operational clean STE, having the transmitter dropping the PL before the transmitter drops is the easiest and very very clean option for anything from scanners that handle PL, to a wide variety of commercial and amateur gear manufacturers.
Some commercial systems keep the PL active, but are using what's known as "Reverse Burst". Instead of dropping the PL before the transmitter dies, the PL's phase is flipped by 180 degrees for Motorola, and 120 degrees for Kenwood and others. If the commercial radio is programmed to accept "reverse burst", AND if it is set for the manufacturer's proper phase-flip, then that too is super super clean. You can see the operational problems if the system employs gear from multiple manufacturers. And, no scanner manufacturer currently has any capability of reverse-burst to my knowledge.
If squelch tails really bug you when listening to CSQ systems, then ADD a Whistler to your stable (not trying to be a fanboy, but give those who need it justification for another purchase!
In my case that would be my simpler 1040 and 1065 units to supplement the Uniden 396xt and 996.
Guess what? The Whistler's dsp does an even better job on csq squelch tails than my Moto HT/MTX gear! So much so, that the ONLY radios I can sneak into my work area are either the Whistler, OR a Motorola that is listening only to systems that drop pl, or are using reverse burst. One nasty squelch tail, and I'll be kicked out of the control room. Sorry, but that means the Unidens stay at home.
But DCS, like mentioned above, is another story on the Whistlers! Hello squelch tails! Workaround: Unless I *actually need* DCS to seperate different groups of co-channel users, I'll just NOT USE any DCS, and program the channel for CSQ! I don't use PL or DCS to artificially cover noise. Thus, the Whistler's DSP in CSQ mode saves my sanity, and allows me to sneak it into the office.
This is especially important since I monitor local amateur 927 mhz repeaters, many of which use DCS. Since I don't really NEED DCS, I just program my Whistler for NO dcs, and all is nice and quiet and nobody at work complains.
Note that some systems that include a linked transmitter system of more than one repeater, may end up putting a squelch tail from other link gear into the link audio itself well before the PL drops, or reverse-burst flips, and there's nothing anyone can do except fix the link no matter what manufacturer you buy your radio gear from, be it scanner or commercial.
I can force the Whistler to fail if I really really try - like placing my 1040 a foot away from a dc-ac power inverter. Or 6 inches away from a video monitor. Don't do that.
So there you go - *add* a Whistler to your system for CSQ, or even for DCS if you don't really need it, and the shack will be more tolerable to workers, or family members.
