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Radioreceptor DX remoto de San Antonio de los Altos

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 Radioreceptor DX remoto de San Antonio de los Altos - San Antonio DX Tuner


Tiara valley, near San Antonio de Los Altos

Photo: Valles de Tiara - Mardonio Diaz

Current Status:  ON 

Location:  this DX-Tuner is 17 KM SSW of Caracas City, and 3 Km SW of the town of San Antonio de Los Altos, at 1484 meters asl.

Receiver JRC NRD 545 DSP

Clear, distortion-free sound reproduction possible through true digital signal processing at the IF level. The receiving system employs a triple conversion circuit with IFs at 70.455 MHz, 455 kHz and 20.22 kHz. The NRD-545 uses a 40-bit extended floating point Digital Signal Processor with an 18-bit over-sampling system A/D converter and a 16-bit D/A converter. The DSP functions on 13 types of circuits after the IF, previously configured using analog circuits. DSP is used for all-mode detection including AM synchronous detection (ECSS). Incredible selectivity characteristics are achieved by the use of an Infinite Impulse, structure concurrent Chebyshev-type digital filter. In English this means, the NRD-545 gives you a continuously variable bandwidth from 10 Hz to 10 kHz in 10 Hz steps. You virtually have 990 different bandwidths, each with excellent adjacent channel rejection. DSP is also used to control Pass Band Shift, another tool to reduce QRM. A 256 step DSP Noise reduction circuit and 256 step DSP Beat Canceller and DSP Auto-Track Notch are other new tools in your arsenal to dig out difficult DX signals. The DSP AGC works in all modes and is continuously variable from .04 to 5 seconds in SSB/CW/RTTY. 1000 Memories store: frequency, mode, bandwidth, ATT, AGC and step. Other refinements include: keypad, DSP Squelch, RS-232 port, ECSS, Dial Lock, Tone, RF Gain, Scan, Sweep, Mute, Dimmer, Clock-Timer, Adjustable Dial Torque, Attenuator, modular construction and two Noise Blankers. A basic Baudot RTTY demodulator, feeding the RS-232 port, is even included. You may customize many functions of the receiver by simply pressing the [FUNC] key followed by the [ENT/kHz] key. Twenty five parameters may be set to your personal needs. Click here to view user setups. Most of this can not be used via the DX-Tuner, unfortunately.The NRD-545 is without question, the most sophisticated receiver ever developed for the hobby market. (Please note that this radio is not designed to receive the FM broadcast band).

Antennas:

VHF/UHF Antenna:
 Discone (default antenna) located at 13 m above ground.
The lenght of cable between the discone and the receiver is 14 m, and is connected via a Stridber Engineering model MC204 VHF/UHF Receiver Multicoupler (25 MHz - 1 GHz) directly. An añlternate discone antena at 14 m above ground can be switched on by e-mail request. This antenna is shared with the San Antonio DX DX-Tuner via the mentioned multicoupler.

HF Antenna:
Assymetric dipole (default antenna)
 The dipole is located at  13 meters above ground.  See the table below for the actual HF antenna currently connected to the receiver. The HF antenna in use is shared with the Caracas DX Tuner. via a Stridberg Engineering model MCA104 Receiver Multicoupler (100 KHz - 50 MHz).

Please report any frequencies  on this DX-Tuner  to yv5fih  DOT arrl.net to update the band guides.

 

Current HF antenna:   1

 
                                    1.- Assymetric dipole 90 meters total length assymetric straight dipole (75 m of 21 AWG sloped & 15 m of 10 AWG horizontal). The 75 m extreme ends at 3 m above ground and the 15 m extreme ends at 13 m above ground). The central connector is at 13 m above ground. The assymetric dipole is oriented for maximal reception at 15 degrees (NNE) . The 75 m extreme is at the NNW side, and the 15 m extreme is at the SSE of the dipole. The lenght of cable from the dipole to the radio is about 9 meters.

2.- Alpha Delta DX-SWL Slopper Antenna 60 ft (20 m) long, 12 m height, 45 degrees slope, oriented for maximal reception E/W.

MW AM 0.5 - 1.6 MHz
120 m (2.3 - 2.5 MHz)
90 m (3.2 - 3.5 MHz)
60 m (4.75 - 5.0 MHz)
49 m (5.95 - 6.2 MHz)
41 m (7.1 - 7.3 MHz)
31 m (9.5 - 9.9 MHz)
25 m (11.65 - 12.05 MHz)
21 m (13.6 - 13.8 MHz)
19 m (15.1 - 15.6 MHz)
16 m (17.55 - 17.9 MHz)
13 m (21.45 - 21.85 MHz)
 

3.- Eaves Dropper Short Wave Broadcast Receiving Antenna, 43 ft  (14.3 m) long at 12 m height (horizontal), oriented for maximal reception NE/SW.

11 m (25.6 - 26.1 MHz)
13 m (21.45 - 21.75 MHz)
16 m ( 17.7 - 17.9 MHz)
19 m (15.1 - 15.45 MHz)
25 m (11.7 - 11.973 MHz)
31 m ( 9.5 - 9.775 MHz)
41 m (7.1 - 7.3 MHz)
49 m (5.95 - 6.2 MHz)
60 m ( 4.75 - 5.06 MHz)
 

4.-Alpha Delta DX-ULTRA full spectrum dipole 80 ft (26.7 m) long, 15 m height V inverted, 500 KHz - 30 MHz broadband coverage oriented for maximal reception SE/NW.

5.- Other antenna: tba
 

Frecuencias de Aeropuertos y Helipuertos posiblemente detectables por este DX-Tuner
 
  Frecuencias de los aeropuertos de Venezuela