W1WU 224.600

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W1WU 224.600The LRRA shares  space on Bennett Hill  with various entities such as commercial, private, and civil. LRRA Tech Committee Co-chair Frank/W1WU has several repeaters in the Amateur bands that are open to the public:

224.600 mhz rf coverage map
w1bst 224.600 MHz rf coverage map

1.25 m:   224.600 MHz  ( – ) PL 123 .  This repeater is often linked to the N1NMO/N1IMN linked network ( https://n1imo-n1imn.us/ ) or the Mt. Washington UHF repeater.

W1WU 224.600

What is a PL?

Continuous Tone Coded Squelch System, or CTCSS is a communications industry signaling scheme called the Continuous Tone Coded Squelch System (CTCSS).

Below is the terminology used by different commercial companies for CTCSS:
PL is the Motorola Abbreviation for “Private Line”.
QC is the RCA abbreviation for “Quiet Channel”.
CG is the General Electric abbreviation for “Channel Guard”.

CTCSS is often referred to as a “PL” tone by many users.
Many repeaters require the use of a PL tone to access the repeater.
The frequency that a user transmits to access a repeater is the Repeater CTCSS Encode Frequency.
The frequency that the repeater transmits to the user is the Repeater Decode Frequency.
Deviation of a transmitted tone should be a maximum of 500Hz.

Motorola decided that they needed their own proprietary name for CTCSS and called their version of it PL (Private Line)

PL and CTCSS are used to prevent a repeater from responding to unwanted signals or interference. They also lessen the annoyance of hearing other conversations when using a shared two-way radio communications channel.

Tone Squelch tells the repeater to respond only to stations that encode or send the proper tone. Most repeaters are “PL’ed”, due to the sheer number of radios and repeaters in their area.

Note:  The LRRA is not formally associated with the above entities.  This information is provided solely in  the interest of advancing radio science and  the enjoyment of the RF spectrum. 

First in the nation with a courtesy tone.