Thorny41587
Member
I'm just wondering why didn't they use DPL instead of a PL tone on the 800 MHz I call channel? Cause DPL is newer than PL.
Thanks for the update. Actually, CR was split almost evenly between NS and CSX.mypoppa said:Conrail is now called NORFOLK SOUTHERN!
156.7 is (supposed to be) the standard tone to be used on the 800mhz I-call/I-Tac freqs.X1536 said:I'm just wondering why didn't they use DPL instead of a PL tone on the 800 MHz I call channel? Cause DPL is newer than PL.
LarrySC said:PL's are cheaper than DPL's
I have seen where two radios programmed the same won't decode each other's PLs because different radio models, manufactures, etc. Sometimes the tolerances are not that great, so I'd rather be safe than sorry on something such as mutual aid.Joseph11 said:Why should it be CSQ?
In my 30+ years of using commercial radios I've never seen quality equipment (such as Motorola, GE, Icom, Yaesu, etc.) display that problem. Somebody needs to be buying better equipment.NeFire242 said:I have seen where two radios programmed the same won't decode each other's PLs because different radio models, manufactures, etc. Sometimes the tolerances are not that great, so I'd rather be safe than sorry on something such as mutual aid.
I think the only reason that happens is because some radios can only be programmed with the reverse pl (I can't remember what it's called, someone on here knows i'm shure). There is a chart online which shows the reverse pl and it's equivcalince to the "regular" pl.NeFire242 said:I have seen where two radios programmed the same won't decode each other's PLs because different radio models, manufactures, etc. Sometimes the tolerances are not that great, so I'd rather be safe than sorry on something such as mutual aid.
Amen to that!grem467 said:There is no reason NOT to use PL on ANY repeater, including hammy repeaters.
grem, there is a reverse DPL and pls and dpls are not perfectly compatible. Incompatible PLs cause long squelch tails and incompatible DPLs sometimes won't open the repeaters input or causes the carrier to drop out. Motos algorithm compared to Kenwood, Vertex and Icoms are different.grem467 said:You are thinking of DPL, there is no such "opposite" PL, as its simply a subaudable tone at a specific audio freqency, not a stream of 1's and 0's. Reverse burst/soft mute is achieved by changing the phase at the end of the transmission, some use 120 degrees out of phase, some use 180... BUT even with this, that does not make it incompatable with other vendors. Generally speaking, as long as your radios are properly aligned to spec a PL is a PL is a PL regardless of the "bells and whistles".
as for running them in CSQ, even the most ancient 800Mhz part 90 compliant radio that can do conventional operation can still do PL, and PL can help keep intermod and other crap out of the repeater. There is no reason NOT to use PL on ANY repeater, including hammy repeaters.