Understanding Input Tones

[TelecomGuy]

D047N
D047l
Can some explain the difference between these two?

My radio is a TidRadio TD-H8

[quarterwave]

"When programming a radio, the technician (or user) would select one of these 84 codes, which are represented as 3-digit octal numbers in the CPS. In some Motorola models, it is possible to select Inverse DPL - this is merely a 1's complement of the DPL code and allows another ~84 codes to be used on a system."

[BoxCar]

The letters designate if the code is normal or inverted. I haven't dug into DCS tones enough to understand the differences.

[SteveShannon]

2 hours ago, TelecomGuy said:

D047N
D047l
Can some explain the difference between these two?

My radio is a TidRadio TD-H8

DCS isn’t a tone; it’s a digital pattern. All the bits are inverted for the I version compared to the N (normal) version but that doesn’t necessarily mean there are twice as many patterns because a digital pattern that is inverted is equal to a normal pattern. For example if you invert the hexadecimal value for “A” it’s “5”.

So why is that done?  Good question. 

Edited August 9 by SteveShannon
Correct my statement. It’s been too long since I’ve thought about flipping bits.

[TelecomGuy]

So if something is listed as 047 DPL

it would be D047N ?

[OffRoaderX]

33 minutes ago, TelecomGuy said:

So if something is listed as 047 DPL it would be D047N

Yes.

The default is Normal.