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Can an STX radio Ptt be disabled

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Seadoo

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I have a motorola STX radio that I want to use as a scanner, But I want to figure out how to keep the ptt from keying up on the system, is there a way to do this. Any help would be appreciated.
 

INDY72

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Yes it can, I am not sure how to go about it, but I do know that it can be TX inhibited. For the help from others which model is it? STX3000???
 

JohnWayne

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Unless someone knows some cool trick that I don't, you can't do TX inhibit on an STX, or most Motorola radios.

Milf: I think you are thinking of the XTS series, not the STX.

The best way to set it up as a scanner is to tell it to do PTT Afilliation. This means that it will not affiliate with the system unless you push the PTT button. Keep in mind that on the STX you can only have 5 talkgroups per personality scanlist, plus the TG that you are on, for a maximum of 6.

You can find the affiliation options under F4-F3-F2. Change the "Affiliate" field to "On PTT". You will also need to enable "Trunking Scan" on that same screen. That screen is also where you enter your scan list.

Hope that helps.

Jeff
 

INDY72

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Your correct Jeff, I was thinking of the other one. TY.
 

Seadoo

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Thanks Jeff and milf.

Jeff, even though I did that it still keyed up on the system even with the wrong connect tone for like 2 secs, but I was able to get it not to key up by setting the individual id to 0001. It seems that the system will not allow a key up with that id, and that what I want. Thanks again for your help
 

Seadoo

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I have another question, When the a radio keys up, what infomation does it transmitt besides Id to the controller. Thanks
 

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STX

You can set an STX to a degree of inhibit by seting the radio as a secure radio... do not turn on keyfail alert..... and the strap all your trunking talkgroups as secure... Set the trunking as PTT ID. When you attempt to keyup...no secure or secure fail will pop up on screen. Since the radio does not have a key loaded... it will not allow you to access a voice channel. On conventional you can set it blank.
 

INDY72

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It depends on if your on a type I or type II system as to info sent. Type I radios send individual ID, Fleet/Subfleet affiliation, and status setting. Type II's generally only send ID, and status, though the actual explanation of the information is far more technical. To keep it easy to understand, lets just say that a Type I has to send three to five times the amount of info each time you TX, than a Type II.
 

rescue161

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Set the radio ID to 'FFFF' or the highest id that it will let you put in. Most controllers aren't set to the max, so if you have the max id programmed in, you'll get a "bonnnnk" when you try to TX...
 

INDY72

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On newer systems, even if you set it to high ID when you key up, it will show up on the system and will be known as an unathorized radio and post 9/11, that is asking for an instant kill command , if they don't do an investigation to find and arrest the user.
 

rescue161

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But can an STX be inhibited?

I still have a bunch of STX radios set to the above configuration and have had no problems.

None of the radios that I own have been disabled.
 

INDY72

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If you set it to secure, and to ID on PTT only and never press PTT, and set to scan, then most likely your ok. I was just stating the info for any others that might not be on the same type of system you are on and stating the obvious warnings. All systems are different as to how they are set up as to the TG protocols. Some systems will not care about an odd ID way up high as it could be assumed these are for training, or testing your HT, or a area ignored as users are only human and make mistakes. But there are a lot that will see any ID not preprogrammed by the administrators of the system, as unathorized, and alert the system controlers to this, resulting in a kill command, or an investigation. Believe me in these post 9/11/01 days ,.. you DO NOT want to be investigated for unathorized usage on a public safety system. Not only will you be in hot water, but then they have a valid issue with security to thier system and will find a way to make it secure, be it encryption, going to a P-25 format which you can't use a HT not on the system to monitor, or other means. So just be careful.
 

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rescue161 said:
Set the radio ID to 'FFFF' or the highest id that it will let you put in. Most controllers aren't set to the max, so if you have the max id programmed in, you'll get a "bonnnnk" when you try to TX...

A lot of agencies, including mine, reserve the higher ID's for the Consoles. You don't want to program in an ID and attempt to transmit as you may cause a console to loose audio as the system will affiliate the ID with the TG that "your" radio is on and not the one it's supposed to be on.

As most agencies don't use ID#1 you would be safer using that one, but don't be suprised if that ID is set to stun a radio in certain systems. :twisted:
 

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Well I thank all of you for the info, to be safe, what I did was just took the radio apart and removed the ptt button on this one radio so that it is impossible to key up even if I wanted to :). I think that is the safest way. I am monitoring a Type II APCO 25 system, so I set it to an incorrect connect tone and set the id to 0001 which the system did not allow it to key up before I removed the button, so I take it that I am safe now.
 

INDY72

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OH boy. If it is an P-25 system, most likely then when you power it on it will automatically affiliate. Maybe it won't, but with these systems, they are designed with special security protocols in mind. Again, be careful.
 

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Some of these responses... :roll: :lol:

With the STX the easiest way to disable transmit is to disconnect the white wire coming from the PTT switch (off the radio's frame), or use the secure method as mentioned but I've never tried it.

Doing things like changing radio ids or connect tones is not a failsafe method. Dicking with the 0xFFFF radio can cause issue with the system but since it's outside of the normal range you can't inhibit the radio. Typically 0xFFFF is associated with systemwide calls so who knows what could happen. Changing the connect tone does nothing but keep the system from passing audio. The system will take your call and grant you a channel like any other call. It will then log the call because the connect tone is wrong, in addition to possibly a bad radio id if it is. Don't give the sysadmin any more reason to think illegal radios are on the system.

Also, Type I call attempts send in less data than a Type II call. The reason being that the fleet/sub/radio id are all contained within a 16 bit field and fall into one OSW whereas Type II call attempts are two OSWs containing the TG (16 bit field) and the radio id (16 bit field).

-Wayne
 

JohnWayne

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I am monitoring a Type II APCO 25 system, so I set it to an incorrect connect tone and set the id to 0001 which the system did not allow it to key up before I removed the button, so I take it that I am safe now.

What I really want to know is how you are monitoring a P25 system with an STX??????

Jeff
 

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Seadoo said:
I have a motorola STX radio that I want to use as a scanner, But I want to figure out how to keep the ptt from keying up on the system, is there a way to do this. Any help would be appreciated.

Not sure on the STX, but on the Jedi series radios, you can set up a personality that does not allow transmit, you then have to set the talkgroups for RX only. It's been so long since I've been working with this that I don't remember the specifics, though.

Tom WA8PYR
 

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wa8pyr said:
Seadoo said:
I have a motorola STX radio that I want to use as a scanner, But I want to figure out how to keep the ptt from keying up on the system, is there a way to do this. Any help would be appreciated.

Not sure on the STX, but on the Jedi series radios, you can set up a personality that does not allow transmit, you then have to set the talkgroups for RX only. It's been so long since I've been working with this that I don't remember the specifics, though.

Tom WA8PYR

You can set a conventional personality for "receive only" but not a trunked personality.
 

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STX as a scanner

For all thats involved you would be better of selling the STX and buying
a scanner... the STX, while an excellent but old radio, only allows for 5 talkgroups to be scanned, you cannot change them on the fly and if you radio is anything but a GPS or GPL controller, you find that you cannot combine splinter and regular channels in your control channel list and there are systems that are set up this way. In the old days when there where not decent trunkers or before they where even available.. I could understand, but these days a new or used trunked portable, with a decent antenna is so much more sensible ... no software issues, no system keys etc , no ID issues no program ribs, expensive cables....... and the added bonus of being able to search for new systems just makes it more sensible.
 
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