Recent Posts

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1
P275 FM Analyzer / Re: Poor S/n on headphone audio output
« Last post by Jan on June 17, 2018, 09:23:40 pm »
Being a measuring equipment, the P275 does not contain extra audio demodulator. Doing so would need adding independent second tuner for audio only - unnecessary for all typical applications.

The audio is taken from the measuring tuner and its performance is limited by input A/D converter resolution. The A/D converter, which processes clipped IF signal, has 1-bit resolution and has sampling rate of 70 MHz. This sampling rate is converted to 169 kHz in several decimation stages while the demodulated MPX resolution increases to 9-10 bits @ 75 kHz FM deviation.

The audio output is 2x PWM, effective resolution 12 bits @ maximum volume.
2
P275 FM Analyzer / Re: MPX spurious signal at 32Khz?
« Last post by Jan on June 17, 2018, 01:25:43 pm »
There's no known issue of that kind. Most probably this is caused by power supply. The dynamic range of the MPX FFT was extended down to -70 dB in the latest version so this may be the reason why you did not see that before. Such small spurious have no effect on anything.
3
P275 FM Analyzer / MPX spurious signal at 32Khz?
« Last post by Richard on June 17, 2018, 01:08:53 pm »
Hi Jan,

Running the latest firmware in the P275 & FMscope 1.5 rev 20.

I notice that there is a strange spurious noise peak (spike) at 32Khz in the MPX spectrum display.
The same spike is present on all stations, regardless of whether they are transmitting Mono or stereo.

Is this a hardware or software issue?

I'm not too concerned about this as long as it i not effecting measurements or demodulated audio.

Regards,
Richard



 
4
P275 FM Analyzer / Re: Poor S/n on headphone audio output
« Last post by Richard on June 17, 2018, 01:02:34 pm »
Thanks Jan,

The new Firmware has improved the headphone audio.

There are still some low level noise products in the demodulated audio, but it is a lot better
than before.

Great to see improvements are happening :)

Kind Regards,
Richard
 

5
Silence Detector / Silence Detector LED Strip
« Last post by dieserkamil on June 15, 2018, 11:13:38 am »
Hello,

Is there any way to connect LED Strip to the software where they will light up when it's silence?

Sincerely, Kamil
6
Control Software / Re: Sending Song Title (P132 and Jazler)
« Last post by Jan on June 13, 2018, 10:05:01 pm »
The P132 is a RDS encoder made especially for Ethernet TCP communication so the setup procedure splits into 3 steps:
  • Determine or assign IP address of the RDS encoder
  • Open TCP listenning port (TCP server) on the encoder
  • Connect the broadcast automation system to the encoder

Step 1

The encoder comes from the factory with DHCP option enabled. That means the IP address is assigned automatically in typical network. The IP address is indicated on the LCD display and when you type the IP address into a web browser, the encoder's internal website will appear.

It is a good practice to fix the encoder's IP address in the settings of your network router, i.e. make the IP address assign permanent so it will keep after possible power-off etc. In your router configuration, section DHCP, you can find the encoder's current IP address and MAC address. Type this information in section DHCP Reservation.

In netwoks without DHCP function, the encoder's IP address needs to be assigned manually. Connect the encoder to the PC using USB cable and run the MagicRDS software. See the pdf documentation for details.


Step 2

Type the encoder's IP address into a web browser, the encoder's internal website will appear.

In section LAN Settings - Port 3 or Port 4 click on Enable, select TCP protocol, encoder is server and fill the TCP port (for example 23). See the picture below. Confirm by Update button.

Click on Reset.


Step 3

From version 2.12 the Jazler RadioStar finally supports TCP connection to the RDS encoder. Thus make sure you have version 2.12 or later.
Older version needs a virtual serial port utility (free for download, type to Google, or use our free solution at https://www.hw-group.com/products/hw_vsp/index_en.html).

In the Jazler's RDS setup, select PIRA32 RDS encoder model. Fill the encoder's IP address and the TCP port from the step 2 (in that example it is 23).

See the Jazler's documentation for details.

Tip
To verify the connection status, open the encoder's internal website. In the Device Status, yellow background of the port 3 or port 4 icon represents live connection from the broadcast automation to the RDS encoder.
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Control Software / Sending Song Title (P132 and Jazler)
« Last post by Jane on June 13, 2018, 02:23:11 pm »
Hi Folks

I'm new to the Pira products and have 2 x 132 units.  I'm having no joy getting our song title pushing out on the RDS.  The title and artist goes to our web site without issue.  We are using Jazler Playout.

Can anyone suggest  anything?

Thanks
8
P132, P232 and P332 RDS Encoders / Re: P132 Introducing Static on the FM Transmission
« Last post by Jan on May 11, 2018, 11:51:51 am »
In correct configuration the RDS encoder is absolutely inaudible.

Does the noise disappear if you disconnect power supply from the RDS encoder?
Does the noise disappear if you set the LEVEL to 0?
Are you using original power supply or own power supply? It the voltage 12 V DC?
What's your transmission equipment brand name and model? (both the stereo encoder and the transmitter)
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P132, P232 and P332 RDS Encoders / Re: P132 Introducing Static on the FM Transmission
« Last post by Gordon_Waters on May 11, 2018, 12:57:13 am »
Thanks, With some testing I have dropped it back to 203mV. The static is certainly not as noticeable, but it's still there slightly.

It's like the station is not quite turned in.

10
FM Transmitters, RF Amplifiers / Re: Pira.cz 1W Portable FM Transmitter problems
« Last post by radium98 on May 09, 2018, 08:42:43 pm »
rd06hvf1 is a mosfet transistor and need some gate voltage about 5v and it is not as an npn rar to find c1971 but some people here will try to help you in the power section
for other stage keep only the bfr96 first one and reburn the pic and stresh the coil of the oscillator so it must work .Blind way i cant help you more so please upload some close pictures of the transmitter
what kind of varicap u use
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