<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div>A quick question about the HPSDR - USB protocol for the Hermes module.<br></div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">The document (USB_Protocol V.1.43) indicates that control register C0 has</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">a value of 0x02 (PTT = off) to program the Transmit NCO frequency via C1-C4,</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">and a value of 0x04 to select the Receive #1 NCO.</div><br><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif;
background-color: transparent; font-style: normal;">However, it appears that C0=0x02 programs the Receive NCO for the first receiver.</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"> I verified this with Wireshark traces of KISS and PSDR. My code writes selecting</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">just one receiver:</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"> Programming just 0x04 does not appear to change the first receiver NCO.<br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"> Programming just 0x02 does
change the first receiver NCO. <br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">So the question - is there a documentation error for which NCOs are selected by</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">the value in C0?<br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">-- Tom, N5EG</div><div style="color: rgb(0, 0, 0); font-size: 16px;
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