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Bons dias caros colegas, <br>
<br>
Esses rádios de base me recordo de ver iguais no meu antigo serviço
Antena1 no Quelhas, muito velhinhos se diga de passagem.<br>
Mas hoje se vem a saber que eram do ano de 1948.<br>
<br>
Um Abraço<br>
CT5GOQ<br>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Assunto:
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<td>ARLA/CLUSTER: Sabia que os primeiros Radios CB em 1948 a
vavulas, operavam na banda de 460 a 470 MHz.? Só em 1958
passaram para os 27 MHz.</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Data: </th>
<td>Wed, 27 Jan 2016 11:25:44 +0000</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">De: </th>
<td>João Costa > CT1FBF <a class="moz-txt-link-rfc2396E" href="mailto:ct1fbf@gmail.com"><ct1fbf@gmail.com></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Responder-Para:
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<td>Resumo Noticioso ARLA/CLUSTER
<a class="moz-txt-link-rfc2396E" href="mailto:cluster@radio-amador.net"><cluster@radio-amador.net></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Para: </th>
<td>Cluster-ARLA <a class="moz-txt-link-rfc2396E" href="mailto:cluster@radio-amador.net"><cluster@radio-amador.net></a></td>
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<p style="margin:0.5em
0px;line-height:22.4px;color:rgb(37,37,37);font-family:sans-serif;font-size:14px">Â </p>
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<td style="text-align:center" colspan="2"><a
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href="https://en.wikipedia.org/wiki/File:ALGROS2.JPG"><img
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src="https://upload.wikimedia.org/wikipedia/commons/thumb/5/51/ALGROS2.JPG/300px-ALGROS2.JPG"
style="margin-right: 0px;" height="199" width="133"></a>Â <img
src="cid:part3.06050107.07070300@sapo.pt" alt="Imagem
inline 2" style="margin-right: 0px;" height="101"
width="130"></td>
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<p><span style="font-weight:bold;text-align:center">Alfred J.
Gross </span>(W8PAL) invented the CB radio in 1945</p>
<p>The citizens band radio service originated in the United
States as one of several personal radio services regulated by
the <a moz-do-not-send="true" title="Federal Communications
Commission"
href="https://en.wikipedia.org/wiki/Federal_Communications_Commission">Federal
Communications Commission</a> (FCC). These services began in
1945 to permit citizens a radio band for personal
communication (e.g., radio-controlled model airplanes and
family and business communications). In 1948, the original CB
radios were designed for operation on the 460â470Â
Megacycle UHF band.<sup class="" id="cite_ref-2"><a
moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Citizens_band_radio#cite_note-2">[2]</a></sup>
There were two classes of CB radio: "A" and "B". Class B
radios had simpler technical requirements, and were limited to
a smaller frequency range. <a moz-do-not-send="true"
title="Alfred J. Gross"
href="https://en.wikipedia.org/wiki/Alfred_J._Gross">Al
Gross</a> established the Citizens Radio Corporation during
the late 1940s to manufacture Class B handhelds for the
general public.<sup class="" id="cite_ref-3"><a
moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Citizens_band_radio#cite_note-3">[3]</a></sup></p>
<p><a moz-do-not-send="true" title="Ultra-high frequency"
class=""
href="https://en.wikipedia.org/wiki/Ultra-high_frequency">Ultra-high
frequency</a> (UHF) radios, at the time, were neither
practical nor affordable for the average consumer. On
September 11, 1958<sup class="" id="cite_ref-4"><a
moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Citizens_band_radio#cite_note-4">[4]</a></sup>
the Class D CB service was created on 27Â Megacycles, and this
band became what is popularly known today as "Citizens Band".
There were only 23 channels at the time; the first 22 were
taken from the former <a moz-do-not-send="true"
title="Amateur radio service" class=""
href="https://en.wikipedia.org/wiki/Amateur_radio_service">amateur
radio service</a> 11-meter band, and channel 23 was shared
with radio-controlled devices. Some hobbyists continue to use
the designation "11 meters" to refer to the Citizens Band and
adjoining frequencies. <a moz-do-not-send="true" title="Part
95 (page does not exist)" class=""
href="https://en.wikipedia.org/w/index.php?title=Part_95&action=edit&redlink=1">Part
95</a> of the Code of Federal Regulations regulates the
Class D CB service, on the 27Â MHz band, since the 1970s and
continuing today.<sup class="" id="cite_ref-5"><a
moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Citizens_band_radio#cite_note-5">[5]</a></sup>
Most of the 460â470Â MHz band was reassigned for business
and public-safety use; Class A CB is the forerunner of the <a
moz-do-not-send="true" title="General Mobile Radio Service"
href="https://en.wikipedia.org/wiki/General_Mobile_Radio_Service">General
Mobile Radio Service</a> (GMRS). Class B CB is a more
distant ancestor of the <a moz-do-not-send="true"
title="Family Radio Service"
href="https://en.wikipedia.org/wiki/Family_Radio_Service">Family
Radio Service</a>. The <a moz-do-not-send="true"
title="Multi-Use Radio Service"
href="https://en.wikipedia.org/wiki/Multi-Use_Radio_Service">Multi-Use
Radio Service</a> is another two-way radio service in the <a
moz-do-not-send="true" title="Band III"
href="https://en.wikipedia.org/wiki/Band_III">VHF high band</a>.
An unsuccessful petition was filed in 1973 to create a Class E
CB service at 220Â MHz, which was opposed by amateur radio
organizations.<sup class="" id="cite_ref-6"><a
moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Citizens_band_radio#cite_note-6">[6]</a></sup>
and others. There are several other classes of personal radio
services for specialized purposes (such as <a
moz-do-not-send="true" title="Remote control"
href="https://en.wikipedia.org/wiki/Remote_control">remote
control</a> devices).</p>
<p>During the 1960s, the service was popular among small
businesses (e.g., electricians, plumbers, carpenters), <a
moz-do-not-send="true" title="Truck driver"
href="https://en.wikipedia.org/wiki/Truck_driver">truck
drivers</a> and radio hobbyists. By the late 1960s advances
in <a moz-do-not-send="true" title="Solid state
(electronics)" class=""
href="https://en.wikipedia.org/wiki/Solid_state_%28electronics%29">solid-state</a>
electronics allowed the weight, size, and cost of the radios
to fall, giving the public access to a communications medium
previously only available to specialists.<sup class=""
id="cite_ref-ind_7-0"><a moz-do-not-send="true"
href="https://en.wikipedia.org/wiki/Citizens_band_radio#cite_note-ind-7">[7]</a></sup>
CB clubs were formed; a <a moz-do-not-send="true" title="CB
slang" class=""
href="https://en.wikipedia.org/wiki/CB_slang">CB slang</a>
language evolved alongside <a moz-do-not-send="true"
title="Ten-code"
href="https://en.wikipedia.org/wiki/Ten-code">10-codes</a>,
similar to those used in <a moz-do-not-send="true"
title="Emergency service"
href="https://en.wikipedia.org/wiki/Emergency_service">emergency
services</a>.</p>
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0px;line-height:22.4px;color:rgb(37,37,37);font-family:sans-serif;font-size:14px"><br>
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<p style="margin:0.5em
0px;line-height:22.4px;color:rgb(37,37,37);font-family:sans-serif;font-size:14px">Fonte:
Wikipedia</p>
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