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, 2024 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.