New to SDR, Need Help.

[hernandoscanman]

I am trying to listen to Hernando County, FL P-25 Phase 2 System. with SDR Trunk, I did all the steps and used Radioreference Import, but when I run the software, it just idles all the time, I tried buying a better antenna, to see if that helps. but so far no.

The system I trying to monitor

Hernando County P25 Trunking System, Spring Hill, Florida

Hernando County P25 Trunking System Profile

www.radioreference.com

SDR I am using.

"SKYFALL" DUAL TCXO SDR TRUNKING RADIO - (2x RTL2832U + R820T2 TCXO - 0.5ppm) | eBay

PATRIOTWAVES "SKYFALL TRUNKER". It's design eliminates coax cable loss with the new designed connection using RG174 splitter to = direct connection to a BNC female adapter. Codecs include P25 Phase I and II, DMR MotoTRBO, NXDN Nexedge, Provoice EDACS and D-Star.

www.ebay.com

any help would be awesome!

Thanks!

 

[32dave]

this note is attached to the first listing the p252

System Notes​

16March2024: System is not fully operational and currently has limited/no voice traffic. I know its a year old but I guess its status hasn't changed

As a side note I bought my first sdr's from the same guy lol

 

[hernandoscanman]

this note is attached to the first listing the p252

System Notes​

16March2024: System is not fully operational and currently has limited/no voice traffic. I know its a year old but I guess its status hasn't changed

As a side note I bought my first sdr's from the same guy lol

System is operating and functional, how do like that model so far?

 

[dave3825]

to listen to Hernando County, FL P-25 Phase 2 System. with SDR Trunk,

when I run the software, it just idles all the time,

Idle means its not receiving the control channel. That site on the system spans 4.325 mhz.

Seller claims that unit has 2 dongles inside with a Y splitter. Post a screenshot of tuners tab showing each dongles settings with the spectrum visible. What version of SDRT?

 

[32dave]

Still using them took them out of the box and mounted them inside the computer I also have a V3 sdr-rtl and two airspys and stream on Zello pics below

 

[hernandoscanman]

Idle means its not receiving the control channel. That site on the system spans 4.325 mhz.

Seller claims that unit has 2 dongles inside with a Y splitter. Post a screenshot of tuners tab showing each dongles settings with the spectrum visible. What version of SDRT?

V0.6.1

 

[DC31]

The frequencies for Hernando P25 are between 769-774 mhz. Your tuners are centered on 101 and 741 mhz. you need to click on each tuner in the lower left box then adjust the center frequency in the right box

if you have your channel playing, you will need to stop it before adjusting the center frequencies.

 

[hernandoscanman]

The frequencies for Hernando P25 are between 769-774 mhz. Your tuners are centered on 101 and 741 mhz. you need to click on each tuner in the lower left box then adjust the center frequency in the right box

if you have your channel playing, you will need to stop it before adjusting the center frequencies.

Like this?

 

[dave3825]

As stated, one dongle is set for 7xx mhz and the other to 101.xx (FM radio). The system is phase 2 but most phase 2 systems can be set up as phase 1.

I would start with one dongle and turn off automatic gain. Play around with a manual setting. Around 327 would be a good place to start.

See if you are receiving better.

 

[hernandoscanman]

As stated, one dongle is set for 7xx mhz and the other to 101.xx (FM radio). The system is phase 2 but most phase 2 systems can be set up as phase 1.

I would start with one dongle and turn off automatic gain. Play around with a manual setting. Around 327 would be a good place to start.

See if you are receiving better.

got it up and running, thank you!

 

[DC31]

Tune dongle 1 to a center freq of 770.85625 and dongle 2 to a center freq of 773.35625 and that should cover the range of frequencies that the Hernando system uses.

remember, you are tuning to the center of a 2.4 mhz band so each dongle will cover 1.2 mhz +/- from its tuned center frequency.

 

[DSheirer]

Tune dongle 1 to a center freq of 770.85625 and dongle 2 to a center freq of 773.35625 and that should cover the range of frequencies that the Hernando system uses.

remember, you are tuning to the center of a 2.4 mhz band so each dongle will cover 1.2 mhz +/- from its tuned center frequency.

@DC31 sdrtrunk handles the frequency tuning automatically when you start the channels. You don't have to change the tuner frequency manually.

 

[hernandoscanman]

@DC31 sdrtrunk handles the frequency tuning automatically when you start the channels. You don't have to change the tuner frequency manually.

I did change the frequencies. I hear almost all the traffic, but it is hit-and-miss sometimes. Should I change it back to default, for lack of a better term, or leave it as is?

 

[DSheirer]

@hernandoscanman two important steps are don't use automatic gain in the tuner - adjust it manually and make sure you adjust the tuner PPM. The user's manual has instructions.

Can you please post another screenshot with adjustments applied? Try to expand the spectral display a bit so that we can see how the signals appear.