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<p>Additional information:</p>
<p>As I lower the signal generator output, the dbm meter tracks
within 1 db. <br>
</p>
<p>The lower the signal level gets, the greater disparity between
the panadapter and the meter. At -113 dbm input (including 10 db
attenuator in that level), the panadapter display is now 30 db
lower.</p>
<p>Any suggestions on what is going on would be gratefully
appreciated. I suspect that this is some artifact of the way the
software works, but would very much like to understand it.</p>
<p>Thanks and very 73,</p>
<p>Jim</p>
<p><a class="moz-txt-link-abbreviated" href="mailto:wb4gcs@amsat.org">wb4gcs@amsat.org</a></p>
<p><br>
</p>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject:
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<td>[hpsdr] Two Questions</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date: </th>
<td>Tue, 29 Mar 2022 21:44:21 -0400</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">From: </th>
<td>Jim Sanford <a class="moz-txt-link-rfc2396E" href="mailto:wb4gcs@wb4gcs.org"><wb4gcs@wb4gcs.org></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Reply-To:
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<td><a class="moz-txt-link-abbreviated" href="mailto:wb4gcs@amsat.org">wb4gcs@amsat.org</a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:hpsdr@lists.openhpsdr.org"><hpsdr@lists.openhpsdr.org></a></td>
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<br>
<br>
***** High Performance Software Defined Radio Discussion List
*****<br>
<br>
All:<br>
<br>
I am building a second Atlas-based HPSDR. Going well. One
question: If IAMBIC is deselected, where do you connect hand key
or WinKeyer? I know this can be done, but it would be a lot of
disassembly to open up the first HPSDR to see how it is
connected. I can't find this info in either Metis or Penelope
manuals. Any help??<br>
<br>
Second, in calibrating frequency and "S-meter", I'm noticing some
interesting things. I have calibrated the radio in frequency and
amplitude. When I feed it a signal from a calibrated signal
generator, the radio is dead-on in frequency and level.<br>
<br>
Here's what's wierd: The S-meter and dbm meter agree with what
I'm providing (accounting for attenuators). When I disable the RF
OUT from the signal generator, the meters drop to -121 dbm and
corresponding S-meter reading for the noise floor. Interestingly,
the panadapter shows the noise floor at -150 dbm or so. There is
also a birdie about 8 KHz lower in frequency at about -120 dbm.
SO, I'm wondering, why the difference? Any ideas?<br>
<br>
I'm wondering if perhaps the meters are integrating the entire 192
KHz spectrum??<br>
<br>
Any thoughts? Ideas most appreciated. This is not a problem,
radio seems to be working fine, but would like to understand what
I'm seeing.<br>
<br>
Thanks and very 73,<br>
<br>
Jim<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:wb4gcs@amsat.org">wb4gcs@amsat.org</a><br>
<br>
<br>
<br>
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