Can an Old Pro-2052 Trunk Phase II if Tapped & connected to a PC

[Indianabrad]

I heard that since an old Pro-2052 can Trunk, that if you discriminator tap it & feed that in to PC and run the right software that, it would trunk Phase II and the PC would demodulate it. Has anyone done this on an old analog trunktracker scanner.

 

[wtp]

Frequency Range (MHz) Types of Transmissions
29–29.7 10-Meter Ham Band
29.7–50 VHF Lo
50–54 6-Meter Ham Band
108–136.975 Aircraft
137–144 Military Land Mobile
144–148 2-Meter Ham Band
148–174 VHF Hi
179.75–215.75 VHF TV
216–225 1-Meter Ham Band
225–400 UHF Aircraft
400–420 Federal Government
420–450 70-cm Ham Band
450–470 UHF Standard Band
470–512 UHF “T” Band
806–824
851–869
896–956 Public Service “800” except Cellular Band
1240–1300 25-cm Ham Band

i hope you are not in need of the 700 band.

 

[Indianabrad]

i hope you are not in need of the 700 band.

Most of the CCs in my area are in the 853 to 858 MHz band. I am also wanting to know if it will trunk Phase II, is the trunking info still in standard 9600 baud data even on Phase II. I have seen a guy on Youtube even demodulate P25 on an old tapped (& PC fed) Pro-2006 , but I'm sure an old trunktracker would be nicer for obvious reasons.

 

[wa8pyr]

Most of the CCs in my area are in the 853 to 858 MHz band. I am also wanting to know if it will trunk Phase II, is the trunking info still in standard 9600 baud data even on Phase II.

About all the 2052 would be good for is monitoring the control channel through a discriminator tap running to Unitrunker as it will not do it natively. You would have to use a Phase II-capable computer controlled radio to track and monitor the audio; the 2052 will not trunk track it (or any P25 system for that matter) or do digital audio.

 

[Indianabrad]

the 2052 will not trunk track it (or any P25 system for that matter) or do digital audio.

I guess you didn't understand the question. I am aware of how old & incapable a Pro-2052 is by itself. I am asking about "Tapping & PC Feeding" here. Are you saying it can only track 3600 baud data & not 9600 baud?

 

[wtp]

1 (1)	018 (12)	Monon	Jasper, IN	851.475	853.8625	856.9625	857.9625	858.9625	859.9625c
1 (1)	091 (5B)	Rensselaer	Jasper, IN	851.625	852.750	853.650	854.9875c	859.9375c

from the safe-t trunking system.
it shows phase 1 right now.
are you trying to future proof the tap ?

 

[wa8pyr]

I guess you didn't understand the question. I am aware of how old the & incapable a Pro-2052 is by itself. I am asking about "Tapping & PC Feeding" here.

I understood perfectly and answered your question in my previous response; tap the discriminator and feed it to a computer running Unitrunker.

 

[wtp]

indianabrad, i sent a PM with an idea, more radios !

 

[Indianabrad]

it shows phase 1 right now.

Just for your info, I run Pro96com on the Monon tower & it is Phase II capable, as Pro96com shows it alternate between Phase I & II on occacation. You can see in my user pic that I have modern scanners, including an SDS200. I want to "Tap & PC Feed" the 2052 just for kicks.

 

[KA1RBI]

The type of modulation used in P25-P2/TDMA is not compatible with FM. P2 must be demodulated ***as PSK***, not as FM.

Nothing stopping you from adding a disc tap to the scanner but the P2 signal at that point in the receiver will already have been irrevokably corrupted by passage through an FM demod/discriminator.

In the (highly likely) event that your P2 system's control channel is also running a simulcast type of modulation ("CQPSK" or "LSM") you will have the same problem attempting to decode the CC.

The disc tap will only work properly with P25 "C4FM" type modulation. So far as I know there is no such thing as a P2/TDMA channel that utilizes C4FM.....

Max

p.s. if you wanted to you could tap the scanner at its final IF (455 KHz) - I do this with an old RS PRO-2006 coupled to a downconverter that outputs a 24 KHz (nominal) IF, fed to a PC sound card. This configuration works very nicely on "LSM" and "CQPSK". AFAIK neither unitrunker nor pro96com are capable of handling this type of input...........

 

[Indianabrad]

So far as I know there is no such thing as a P2/TDMA channel that utilizes C4FM.....

So youre saying that a standard tap on old scanners is "no dice" for Phase II? .... I'm am thinking I will just go down the SDR "rabbit hole" as the Scanner Guys on Youtube referred to it. And let sleeping / dead scanners lie. ... I actually just want to decode Phase II audio from the old 2052 with a PC. ... I am already decoding CC data of two P25 sites near me with two GRE derived scanners & Pro96com. .... I have a new SDS200 but if I can make some of my old analog scanners useful again then why not.