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<tt>The calculations in the FPGAs of Hermes, Mercury, and Penny that
determine frequency up- and down-conversion have finite
resolution, which might result in small frequency offsets from the
ideal.<br>
Dave<br>
WA8YWQ<br>
</tt><br>
<br>
On 1/12/2013 6:36 AM, Tokio Endo wrote:
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cite="mid:FEEKICFINDNGNDCFFMGNKEIJCLAA.rfcgf600@ybb.ne.jp"
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<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
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<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">Hi All,</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013"></span></font> </div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">It's very strange. Even with
Penny and Metis, when I transmit 3.530 000, the TX frequency
is 3.529 9989, 1.1Hz down from the displayed frequency.</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">In other frequency the measured
one may be correct in the transmission.</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">In the firmware of Penny there
might be some error, or frequency data to Penny.</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">It is very very fundamental
issue.</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">Is there any comments on that? </span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013"></span></font> </div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">73</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">Tokio Endo</span></font></div>
<div><font color="#0000ff" face="Arial" size="2"><span
class="750292814-12012013">JA1CCA</span></font></div>
<div><font color="#0000ff" face="ＭＳ Ｐゴシック" size="2"><span
class="750292814-12012013"></span></font> <br>
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