# Question on Dual PL

**URL:** <https://community.allstarlink.org/t/question-on-dual-pl/17279>\
**Category:** AllStarLink\
**Created:** [July 13, 2020, 12:06pm UTC](https://community.allstarlink.org/t/question-on-dual-pl/17279 "2020-07-13T12:06:45Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![WB2HKK](https://community.allstarlink.org/user_avatar/community.allstarlink.org/wb2hkk/32/843_2.png) [@WB2HKK](https://community.allstarlink.org/u/WB2HKK)\
**Post date:** [July 13, 2020, 12:06pm UTC](https://community.allstarlink.org/t/question-on-dual-pl/17279/1 "2020-07-13T12:06:46Z")

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I need to transition our repeater to a new PL. I have ’ txctssdefault =141.3 ‘, ’ rxctcssfreqs=141.3,151.4’, and ’ txctcssfreqs=141,3,151,4 '. The repeater outputs whatever tone it hears, seems to work fine. Do I need the ’ txctcssdefault ’ line? What does it do? Also, I’m guessing if I only specify one ’ txctcssfreq ', it will always transmit that tone.

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**Author:** ![WD6AWP](https://community.allstarlink.org/user_avatar/community.allstarlink.org/wd6awp/32/5_2.png) [@WD6AWP](https://community.allstarlink.org/u/WD6AWP)\
**Post date:** [July 14, 2020, 2:03pm UTC](https://community.allstarlink.org/t/question-on-dual-pl/17279/2 "2020-07-14T14:03:11Z")

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I didn’t know AllStar would decode dual PL tones. I also didn’t know AllStar would generate the tone it hears. I kinda doubt it’s doing either. 🤷‍♂️

I’ve never found AllStar (USBradio) very good at PL decode so I always have the repeater do it.

Do you have the AllStar PL filter on? Maybe you repeater is passing the tones via the audio path.

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**Author:** ![WB2HKK](https://community.allstarlink.org/user_avatar/community.allstarlink.org/wb2hkk/32/843_2.png) [@WB2HKK](https://community.allstarlink.org/u/WB2HKK)\
**Post date:** [July 14, 2020, 3:43pm UTC](https://community.allstarlink.org/t/question-on-dual-pl/17279/3 "2020-07-14T15:43:33Z")

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AllStar does PL rather well! The parameters are in ’ usbradio.conf ’ as I stated above. I did find that adjacent PL tones may at times be decoded. Seems the digital PL window is a bit wide. Other than that, I’ve been using it for many years. You can specify more than 1 tone as well. It then matches the transmitted to to the received tone. If you search ’ PL tone ’ there is another post on this topic about one tone being repeater only and the other for connected nodes, but it’s not not very clear to me.

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**Author:** ![WB2HKK](https://community.allstarlink.org/user_avatar/community.allstarlink.org/wb2hkk/32/843_2.png) [@WB2HKK](https://community.allstarlink.org/u/WB2HKK)\
**Post date:** [July 14, 2020, 4:20pm UTC](https://community.allstarlink.org/t/question-on-dual-pl/17279/4 "2020-07-14T16:20:58Z")

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Upon further experimentation, I must correct my initial post. With the parameters stated, and rxctcssoverride=0, the repeater ALWAYS transmits the ’ txctcssdefault= ’ tone, regardless of the rx tone.