is a cultural, educational broadcast group, based
in Asunción, Paraguay. Programs produced
in our Ñemby studios go out locally on medium
wave, wordwide on the Internet, by cassette tapes,
and now experimentally also on shortwave.
There are two groups of
ancestors for Radiodifusión América:
The programming is the brainchild of Pastor José
Holowaty of KGEI - La Voz de la Amistad. Pastor
Holowaty was director of this San Francisco, California-based
station, for many years. He specialises in Bible
teaching, and is a noted expert in classical music.
The high quality and originality of our programs
result from the careful direction and tutelage of
Pastor José Holowaty.
the technical side of things, Radio América
descends from an experimental station, born in the
city of San Juan Bautista, Misiones. An ironmonger,
known as Peso Justo (Mr Honest Weights),
assembled a transmitter from a valve audio amplifier,
and wound inductors on bamboo, just after World
This station, with the name of Radio América,
reached the six or eight receivers existing within
a few city blocks of the transmitter. Señor
Peso Justo worked hard to increase the range, and,
with time, the station could be heard out in the
countryside, in the direction of Pilar.
The Radio América of Señor Peso Justo
specialised in public announcements, for which he
charged a small fee. For example, the radio would
announce that "Señor X should go, as
quickly as possible, to Pilar, as his mother was
Señor Peso Justo also broadcast the names
of persons with delinquent accounts in local businesses.
This served to deter bad financial conduct in the
region. Interspersed with these announcements was
Paraguayan Polka music.
Radio América became an officially recognised
station, with the assignment of the ZP20 callsign.
Later on, ZP20 was moved to Villeta, alongside the
Paraguay River. It continued to specialise in the
same programming, along with Paraguayan Polka and
Mexican Ranchero music. Radio América became
very popular with listeners in Paraguay.
In Villeta, the station
was owned by the local Police Commissioner. He installed
the station in the hen house of his farm, located
on high ground, between Villeta and Ypané.
A Korean technician constructed a new transmitter,
using 833-type valves. This required a supply of
3000 volts to the anodes. They also constructed
a new tower, over 100 meters tall.
A severe storm destroyed most of this tower. There
was no money available to rebuild it. The Police
Commissioner appealed for permission to move ZP20
to his property, in Ñemby, which is much
closer to Asunción. Radio América
was reconstructed, in Ñemby, with what was
left of the damaged tower, and the 833-type valve
transmitter. Ñemby is much better protected
against storms, owing to the surrounding hills.
time, Radio América became the cultural/educational
station that it is today. The old valve transmitter
was replaced by a PDM transmitter, using mosfets.
The audio and energy systems have been completely
ZP20 Radio América serves the metropolitan
region of Asunción from Ñemby. It
uses 1 kW of power, on 1480 kHz, feeding a quarter-wave
Our new transmitter site is located near Villeta,
37 kilometers downriver from central Asunción.
There are three transmitters, all constructed here
in Paraguay. The new transmitters are solid-state,
and use Class A amplification, in order to assure
maximum audio quality.
Owing to the irregular energy supply out in the
countryside, our new transmitters operate from battery
banks. They are recharged, using heavy-duty rectifiers.
Two of the transmitters operate on HF and one on
MF. Each has a theoretical power output of 2.4 kW.
7 MHz ideal for
Here in Paraguay, frequencies
above 9 MHz tend to overshoot the target areas.
Frequencies below 7 MHz tend to propagate only out
to 500 kilometers during the daytime. Thus, we use
the 41 meter band, from empirical observation, and
from computer-generated propagational forecasts.
choice also allows us to maintain the same frequencies,
day and night. Many receivers available in South
America have shortwave bands. However, the majority
tune only from 2 to 12 MHz. Therefore, 7 MHz is
located right in the middle of the dial, for most
At Villeta, we have four antennas. One is for the
medium waves, and is 125 meters tall. It is equipped
with 18 kilometers of buried radials, one for every
two circular degrees. This antenna has a theoretical
gain of 8.84 dBi, is omnidirectional, with vertical
take-off angles of from 3 to 27 degrees above the
We have, as well, a large Corner Reflector antenna.
This is beamed at 184 degrees, from Magnetic North.
The antenna is 82 meters long, on three sides, and
is 26 metres tall. There is a theoretical gain of
25 dBi. The horizontal beamwidth is 22.5 degrees,
with vertical take-off angles of 3 to 27 degrees
above the horizon.
There are two 5/8-ths wavelength
radiators, using the backside of the Corner Reflector,
to serve 4 degrees from Magnetic North. These antennas
have a theoretical gain of 8,84 dBi, a horizontal
beamwidth of 45 degrees, and vertical take-off angles
of 3 to 27 degrees above the horizon.
Radiodifusión América is testing,
from Villeta, on the frequencies of 7385 in the
41 meter band and on 1610 kHz in the medium waves.
From Ñemby, regular programs continue on
1480 kHz. All frequencies are normally on the air
24 hours, seven days a week. The Villeta transmitter
site is connected with the Ñemby studios,
via PCM radio link.
Shortwave frequencies are
changed from time to time, so be sure to check the
America Forum on DXing.info Community for the
latest information. For instance, we plan to replace
7385 kHz with 9980 kHz shortly. And when you hear
us, don't forget to send us your reception reports,
they are most welcome and correct reports will be
October 1, 2002