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Hi,<br><br>Now I am beggining to understand how it really works...<br><br>I found that statement in internet;<br><br><font style="" color="#0070c0">Nyquist requirement to sample at two times the highest frequency of</font><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">the input signal is for avoiding aliasing of baseband signals.</font><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">Bandwidth limited signals (like radio signals) don’t have frequency</font><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">components near DC. That being the case, the type of aliasing that the Nyquist Sample Rate</font><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">attempts to avoid isn’t a problem</font><font style="" color="#0070c0">.<br></font><font style="" color="#0070c0">Shannon’s Information Theorem states that <u>all of</u></font><u><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">the information in a bandwidth limited signal can be captured with a sampling rate as low as</font><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">twice the signal’s bandwidth.</font></u><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">In other words, a 500 MHz carrier signal with a 30kHz bandwidth can be sampled at a</font><font style="" color="#0070c0"><br></font><font style="" color="#0070c0">frequency as low as 60kHz and still capture all of the signal’s information</font><br><br><br>If the LTC2208 is able to sample up to 700 MHz so we could capture any 60 MHz bandwith between 1 and 700 MHz with the Mercury card, not just HF.<br>Is that true?<br>Is there any way to say to Mercury what 60 MHz to sample?<br><br>Thank you<br><br>73, Maximo - EA1DDO<br><br><br><hr id="stopSpelling">From: roland.etienne@free.fr<br>To: ea1ddo@hotmail.com<br>Subject: RE: [hpsdr] 700MHz Full Power Bandwidth S/H<br>Date: Sun, 29 Aug 2010 15:58:31 +0200<br><br>
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<p class="ecxMsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Hi Maximo,</span></font></p>
<p class="ecxMsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="ecxMsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">This means that it can be used with
signals uo to 700 Mhz, but of course with a 130 Mbps maxi of sampling, you can
expolit a 65 Mhz band pass up to 700 Mhz, for example 640 – 700 Mhz is
possible.</span></font></p>
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<p class="ecxMsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">73, Roland f8chk.</span></font></p>
<p class="ecxMsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p class="ecxMsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">De :</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;"> hpsdr-bounces@lists.openhpsdr.org [mailto:hpsdr-bounces@lists.openhpsdr.org] <b><span style="font-weight: bold;">De la part de</span></b> Maximo EA1DDO_HK1DX<br>
<b><span style="font-weight: bold;">Envoyé :</span></b> dimanche 29
août 2010 14:09<br>
<b><span style="font-weight: bold;">À :</span></b>
hpsdr@openhpsdr.org<br>
<b><span style="font-weight: bold;">Objet :</span></b> [hpsdr] 700MHz Full
Power Bandwidth S/H</span></font></p>
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<p class="ecxMsoNormal"><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;">Hi,<br>
<br>
There is something that I do not understand. <br>
If you see the LTC2208 specs at;<br>
<br>
<a href="http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1155,C1001,C1150,P13693" target="_blank">http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1155,C1001,C1150,P13693</a><br>
<br>
There is a feature that I do not understand the meaning; <b><span style="font-weight: bold;">700MHz Full Power Bandwidth S/H</span></b><br>
<br>
Any one is able to explaint it to me?<br>
<br>
Thank you<br>
<br>
73, Maximo - EA1DDO</span></font></p>
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