John,
The short answer is 'no'. Click here http://www.juanr.com/pages/hobbies/ham_radio/Eagle/IMD+Phase_Noise.htm for details and scroll to the bottom of the log...
Juan
-----Original Message----- From: John B. Stephensen [mailto:[email protected]] Sent: Sunday, July 01, 2007 2:42 PM To: [email protected] Cc: [email protected]; Bill Ress; Dave Black (Home); Dave Black (Work); Dave hartzell; David Smith; Don Ferguson; Juan. Rivera (Home); Juan.Rivera (Work); Samsonoff@Mac. Com Subject: Re: 10.7 MHz Spur
Does the spur go away if the external reference is on (whether or not it is
routed to the PLLs)?
73,
John
KD6OZH
----- Original Message -----
From: "Juan Rivera" [email protected]
To: "John B. Stephensen" [email protected]
Cc: [email protected]; "Bill Ress" [email protected]; "Dave Black
(Home)" [email protected]; "Dave Black (Work)"
[email protected]; "Dave hartzell" [email protected]; "David
Smith" [email protected]; "Don Ferguson" [email protected]; "Juan. Rivera
(Home)" [email protected]; "Juan.Rivera (Work)"
[email protected]; "Samsonoff@Mac. Com" [email protected]
Sent: Saturday, June 30, 2007 14:22 UTC
Subject: 10.7 MHz Spur
John,
I found the source of the 10.7 MHz spur. It's being generated inside the
receiver itself. This is the first spur I have found that is not caused
by
switching power supplies.
The origin appears to be in the 10 MHz reference area. I turned off and
unplugged the SDR-IQ and fed the IF output from the 70 cm Receiver to my
TS-2000. The spur is still there.
Next I connected the RF input to my sniffer loop and moved it around the
PCB
surface. I get the strongest signal near the long trace between the two
Freq inputs to U4 and U9, the two phased-locked loops.
73,
Juan