Especificaciones Técnicas del VA-16
Technical Specs VA-16

 I- FM DIGITAL RECEIVER

1-FREQUENCY RANGE: 87.5 - 108 mhz

2-FM CHANNELS: 50 kHz steps

3-PRESET FM STATIONS: 16 Preset Memories, including Name

4-FRONT END: Dual Gate Mosfet

5-IMAGE REJECTION: 50 dB

6-IF REJECTION: 80 dB

7-SENSIBILITY: 20 uV ref -50 dB noise

8-NOISE: S/N ratio > 75 dBA

9-IF BANDWIDTH: 300 khz, audio / 10 khz Bandwidth and Spectrum

10-FREQ RESPONSE: 20-15 khz, +/- 1 dB

11-AUDIO OUT: Stereo; + 4 dBm, 600 Ohms / 10K

12-HEADPHONE: 1/8"stereo, 32-600 ohms

II- TEST MEASUREMENTS AND
DIGITAL PROCESSING

1-MODULATION: FM Modulation from 0 to 150 %; +/- 2 %
(100 % = 75 khz); Peak or 2 milliseconds
FM deviation peak from 0 to 112 khz
**Optional: 0,1 % precision, 100% Modulation, crystal calibrator

2-OVERMODULATION: peaks/minute counter over 105 %

3-FIELD INTENSITY: 30 to 100 dBuV with user defined correction factor for antenna gain.

4-CARRIER DEVIATION: Digital display, + / - 9,9 kHz in 0,1 kHz steps / Error < 0,1 kHz

5-STEREO LEVEL: -20 to + 5 dB L/R & L-R Mode, user selected 2 state VU: Ballistic & Peak

6-STEREO PHASE: Phase Correlation from 0 to 180 degrees. It indicates the true stereo sensation the audience is hearing. Analog Vectorscope and Digital mode.
MONO & INVERSE phase

7-RADIATED POWER: Relative radiated power, measured from 0 to 5; indicates the increase at the RF power due to the audio processing chain. An unity value means a standard audio compressor (12 dB peak/average ratio).

8-PILOT LEVEL: 19 khz pilot level, from 0 to 20 % in 0.1 % steps +/- 0.5 %

9-PILOT FREQUENCY: Frequency error from -99 to + 99 hz +/- 0.5 hz

10- MULTIPATH DISTORTION: Relative indication from BAD to 5 levels of GOOD

11-NOISE: L & R noise level; -30 to -75 dBA, +/- 2 dB; 20-10 khz, ŤAť weighted. Automatic measure using brief samples of the silences associated with the normal FM program.

12-CHANNEL SEPARATION: L-R and R-L separation, from 0 to 50 dBA, +/- 2 dB. Automatic measurement during brief samples of music with Pot-Pan effects used by recording engineers.

13-HARMONIC DISTORTION: 0.02 % to 5 %. It measures 2nd and even harmonic distortion due to the FM modulation process. Automatic measurement is performed using the speaker voice and measuring the Modulation Transfer Function of the voice. Then, is processed (DSP), using the Bonello algorithms.

14-FREQ RESPONSE: 30 hz to 15 khz; +/- 1 dB Automatic measurement using 8 spots of 5 sec each, to be aired during night (only one spot each hour is enough).
The spots are provided with the VA-16 (WAV files).

15-SPECTRUM ANALYZER: Selectable frequency span, from +/- 250 khz to +/- 1 mhz in 25, 50 and 100 khz steps. Bandwidth is 10 khz. Measure range = 50 dB, +/- 3 dB.

16- MODULATION BANDWIDTH: Graph of % MOD from zero to +/- 150 kHz, BW of measure = 10 kHz

17-SCANNER: Frequency scan of all the odd FM band channels, from 87.5 to 108 mhz. Field intensity levels shown on screen in five colors. Field Intensity from 40 to 100 dBuV +/- 3 dB.

 III- ON-AIR PERFORMANCE PRINTED RECORDS

The VA-16 can store, at the PC computer, record files of the total performance of the FM Radio, 24 hrs a day, one file each day. Several months can be stored and sent by E-mail to the main Engineering Office to be audited. The On-Air performance can be seen from the PC screen or can be printed in color. It is updated every hour and has the following items:

A) RADIATED POWER: Average of radiated power during each hour. Last hour is shown on screen. It gives information about the quality of the audio processing chain and the average coverage area of the Radio.

B) MAX MODULATION: The peak value of modulation is stored each hour. Last hour is shown on screen. It gives valuable information about the quality of the audio processors and the efforts of your Chief Engineer to avoid overmodulation.

C) 3 SEC SILENCE: If a silence of 3 sec or more is produced (program gap), this event is stored. You can control the number of gaps/hour. Last hour shown on screen. It allows the manager to know the commitment level of the DJs and audio operators.

D) REVERSE PHASE: Each time a spot, commercial, musical tune, etc, is aired with its stereo phase reversed, the event is stored. Last hour is shown on screen. It gives information about the care your Engineers take to avoid bad audio connections.

E) L & R LEVEL: Left & Right average audio level is recorded each hour.

F) STEREO PHASE: The stereo correlation phase is averaged and recorded each hour. It gives information about the average stereo quality sensation of the CDs and music sound sources the Radio is using.

G) 24 Hrs printed log includes all the above and: Field Intensity, Channel Separation, L-Noise, R-Noise, Pilot Error, Pilot Level, Carrier Deviation and THD Distortion. 

MODELS

VA-16/RK Model for use in rack or table top, with steel case and vertical whip antenna with magnetic base.

VA16/LCD Idem model RK, PC operated or stand-alone unit. With 2 x 40 backlighted LCD display

VA-16/P/LCD Portable model, with carring bag and whip antenna.. Internal Battery; 4 hs continuous operation for stand-alone or Laptop use. Internal battery charger, 220 / 117 V 50/60 hz operation.