• To anyone looking to acquire commercial radio programming software:

    Please do not make requests for copies of radio programming software which is sold (or was sold) by the manufacturer for any monetary value. All requests will be deleted and a forum infraction issued. Making a request such as this is attempting to engage in software piracy and this forum cannot be involved or associated with this activity. The same goes for any private transaction via Private Message. Even if you attempt to engage in this activity in PM's we will still enforce the forum rules. Your PM's are not private and the administration has the right to read them if there's a hint to criminal activity.

    If you are having trouble legally obtaining software please state so. We do not want any hurt feelings when your vague post is mistaken for a free request. It is YOUR responsibility to properly word your request.

    To obtain Motorola software see the Sticky in the Motorola forum.

    The various other vendors often permit their dealers to sell the software online (i.e., Kenwood). Please use Google or some other search engine to find a dealer that sells the software. Typically each series or individual radio requires its own software package. Often the Kenwood software is less than $100 so don't be a cheapskate; just purchase it.

    For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).

    This is a large and very visible forum. We cannot jeopardize the ability to provide the RadioReference services by allowing this activity to occur. Please respect this.

Question - NXDN and DTMF

Status
Not open for further replies.

dapaq2

Member
Joined
Oct 10, 2005
Messages
253
Location
Merrillville, Indiana
I have been told that DTMF tones will NOT pass through using NXDN when working with remote devices or anything else that decodes DTMF signals, but doing some yahoo searching I have found a few results that state "NXDN will pass thru DTMF on limited testing" or worded somthing close to that. Anyone know exactly what this means? I am trying to find out if there is any truth to what I have been told. Using an NXDN system and pressing the dtmf keys, will a dtmf decoder receive those tones properly or will it receive no dtmf tone to decode?

Thank You,

Doug
 

n5ims

Member
Joined
Jul 25, 2004
Messages
3,689
It will receive the tones, but they may be distorted enough by the analog to digital and digital to analog conversion (audio to digital audio to transmit the tone and digital to analog audio on receive) that there may be too much distortion and/or frequency shifting to properly decode the tones. Chances are that they'll sound OK to a human (where the brain will piece together or modify the audio), but will be out of spec for the decoder.
 

dapaq2

Member
Joined
Oct 10, 2005
Messages
253
Location
Merrillville, Indiana
What signaling formats in addition to DTMF are affected by NXDN, and are there any other signaling formats that are NOT affected by NXDN as you describe the problem above?

Thanks,

Doug
 

Josh

Member
Premium Subscriber
Joined
Mar 6, 2002
Messages
734
Location
Wyandotte Michigan
Unlike DTMF over P25, NXDN allows for DTMF tones to be passed through with surprising clarity on the receiving end. I guess the codebook used for AMBE has codes directly related to DTMF tones.

While the output on the carrier, however, is totally digital, the decoded audio is very clean DTMF.
 

ramal121

Member
Joined
Dec 5, 2008
Messages
1,636
Location
Sonoma, CA
DTMF is regenerated by the receiving radio and is cleaner and more reliable than tones going through an analog system. I have a phone interconnect hooked to a control station on a repeated conventional NXDN channel and it works great (at least as good as would be expected).

This is used with either the autodial feature of the radio or Kenwoods "smart" DTMF mics. What you cannot do is hook a generic encoder to the mic line and expect that to go.
 
Last edited:

ramal121

Member
Joined
Dec 5, 2008
Messages
1,636
Location
Sonoma, CA
The transmitting radio does not send digitized DTMF audio out (as would voice be), it only sends control bits as overhead. The receiving radio in turn will say hey, I need to generate a DTMF 5 for audio output. This is done with the codec and DTMF is the only format that the radio will do. Why? Think cel phones, they would be pretty useless if they couldn't pass DTMF.

All other audio signaling formats would have to be digitized and sent with voice which would basically trash the heck out of them. If you look at the program software for a NXDN channel, you will see analog signalling ( 2-tone, fleetsync, etc) grayed out and unable to be used.
 

stevelton

Member
Joined
Apr 19, 2005
Messages
359
It would be nice for those of us that use Alert Tones, for the benefit of getting the attention of users listening to their radio, but not really paying attention. We use 2 diffeerent 2-tones on our ham repeater, for mainly that reason. Now that our ARES is switching to IDAS, I will have to build a console, and add the tone ability externally. Right now, I can just do it from the radios buttons.
Steven
 
Status
Not open for further replies.
Top