A few GMRS questions...

[iepoker]

Any preference out there between DPL and PL? And Why.

Can I use DPL for input to a repeater and PL for the output?

[gewecke]

Originally Posted by iepoker

Any preference out there between DPL and PL? And Why.

Can I use DPL for input to a repeater and PL for the output?

I prefer non standard dpl, and yes by all means.

73,
n9zas

[iepoker]

There is no differenece in range or tone quality if I go DPL? It always seems like my gear has a low hum in DPL modes.

Seems like everyone uses PL, and I would prefer the PL/DPL split if for nothing else than to make my repeater more difficult to access for blister packers.

[gewecke]

Originally Posted by iepoker

There is no differenece in range or tone quality if I go DPL? It always seems like my gear has a low hum in DPL modes.

Seems like everyone uses PL, and I would prefer the PL/DPL split if for nothing else than to make my repeater more difficult to access for blister packers.

Most of the people with blisters (sic) I mean radios, rarely even know their radio has a options menu much less pl tones.
Receiver sensitivity may be a little less when using a pl tone, but not enough to hurt.

73,
n9zas

[redneckcellphone]

Why not just run it dpl all together?


Sent from my iPhone yes iPhone using Tapatalk app thingy

[RKG]

1) The onlyl issue with DPL is that thereis no convention for which way voltage begins to depart the zero voltage line to define a "1" (versus a "0"). As a result, you will sometimes find that a transmitter programmed for DPL xxx won't open a receiver programmed for DPL xxx. The solution is to program the receiver for the "inverted" function of DPL xxx.

2) Using "non-standard" DPLs can be problematic, as they are subject to falsing as a result of bit shifting. Stick to one of the 83 or so "approved" DPLs. See Tone Signaling Charts For: CTCSS, DCS, Motorola Quick Call, Plectron, Reach, Tone Remote, Morse Code, Five-Tone, Six-Tone, Seven-Tone and More! and look at the note on the DPL table.

3) Most substantial repeaters (e.g., Quantar, MTR) employ controllers capable of using different codes for input and output (known as "split tones") or using DPL for one and PL for other (known as "split format"). DPL in and PL out is a common arrangement. However, it only works if the subscriber equipment is also compatible with split tones and split formats.

4) Likewise, many third-party external controllers (e.g., Zetron) are capable of split tones and split formats.

[rapidcharger]

Some people can hear PL tones, especially over 200 hertz.

As for what I prefer, it depends one what I'm trying to do. If I'm setting up a ham repeater and want to encourage access to the system, I would use a PL tone, particularly in an area where same PL is used throughout the city. (Some cities in FL come to mind)

If it's a private system where I don't want anyone else using it and I want to minimize interference, sure I'll use non standard, inverted DPLs.

[iepoker]

A sound engineer by trade, I can certainly tell the audio hum of PL/DPL vs. Carrier squelch. I can also tell the difference between mp3 and full dose wave files...

...either way, I really appreciate the input from you guys. Its nice to know where to go to get answers to questions.

I will likely go PL on my output and DPL on my input, just to give the blisterers the most possible trouble.

Thanks Again,

[jvdet]

is it OK to license a digital emision 8K10F1E or can i license a narrowband 11K2F3E ?
my license is up for renewal

[SteveC0625]

Originally Posted by jvdet

is it OK to license a digital emision 8K10F1E or can i license a narrowband 11K2F3E ?
my license is up for renewal

Unlike conventional radio station licenses, GMRS allowable emission types and bandwidths are specified in the rules. Your GMRS license then allows use of any permissible type. Here are the Part 95 sections on emission types and allowable bandwidth:

95.631 Emission types.

(a) A GMRS transmitter must transmit only emission types A1D, F1D, G1D, H1D, J1D, R1D, A3E, F3E, G3E, H3E, J3E or R3E. A non-voice emission is limited to selective calling or tone-operated squelch tones to establish or continue voice communications. See 95.181(g) and (h).

(b) [Pertains only to the Radio Control Radio Service.]

(c) [Pertains only to the Citizens Band Radio Service.]

(d) [Pertains only to the Family Radio Service.]

(e) No GMRS or CB transmitter shall employ a digital modulation or emission.

(f) No GMRS, CB or R/C transmitter shall transmit non-voice data.

95.633 Emission bandwidth.

(a) The authorized bandwidth (maximum permissible bandwidth of a transmission) for emission type H1D, J1D, R1D, H3E, J3E or R3E is 4 kHz. The authorized bandwidth for emission type AID or A3E is 8 kHz. The authorized bandwidth for emission type F1D, G1D, F3E or G3E is 20 kHz.

[Alarms50]

PL's & DPL' s are discussed in this thread pl or dpl tones.