cajunjerry
Member
Do rail road companies use P L TONES? I am in NW Louisiana searching for L & N W railroad I found what sounds like RR 159.945. Dcs 351
Usually no, but they might in some areas. We have UPRR here and they don't. 73, n9zasDo rail road companies use P L TONES? I am in NW Louisiana searching for L & N W railroad I found what sounds like RR 159.945. Dcs 351
Do rail road companies use P L TONES? I am in NW Louisiana searching for L & N W railroad I found what sounds like RR 159.945. Dcs 351
160.53000 BM CSQ L&NRR-ROAD Road Operations Gibsland, La. to McNeil, Ark. FM Railroad Pulled it from the Radioreference Railroad section of Louisiana.Do rail road companies use P L TONES? I am in NW Louisiana searching for L & N W railroad I found what sounds like RR 159.945. Dcs 351
To add confusion to the mix, at least one RR near me has gone to NXDN digital.
I discovered Amtrak regularly using pl103.5 on 160.920 from what I can monitor of the northeast corridor, Springfield, and MRS lines.
PBX systems may have had an output PL but not input. This was due to the locomotive radio limitation - and didn't matter as you needed the DTMF access codes to dial the company lines.
All legacy SP, UP, BN and SF systems are still setup this way (as I have used three of the four).
In addition, back "in the day" PL boards or options usually were not purchased by the railroads - due to cost and many radio models did not support it. The lunch box radios and early loco radios (usually four channels) just didn't support it.
Remember these were the days of channel elements and had to withstand the vibrating use. EEPROM or PROM based programming wasn't until the mid to late 80's in general - and the railroad spectra didn't pop up until the early 90's
Such radios cores were standard commercial radios with custom interfaces for the user, and with the exception of Riton, basically is still that way today (JEM, Nexterma and I beileve GE's).
My point was that there is no reason (and the railroads didn't and generally don't) use PL's on the output of the PBX repeaters or bases, especially when/if the repeater uses CSQ on the input. This would be backwards of common sense and defeats the purpose of PL use in general.