[eagle] Re: 10.7 MHz Spur
juan-rivera at sbcglobal.net
Sun Jul 1 16:02:15 PDT 2007
I don't know. I'll check...
From: John B. Stephensen [mailto:kd6ozh at comcast.net]
Sent: Sunday, July 01, 2007 2:42 PM
To: juan-rivera at sbcglobal.net
Cc: eagle at amsat.org; Bill Ress; Dave Black (Home); Dave Black (Work); Dave
hartzell; David Smith; Don Ferguson; Juan. Rivera (Home); Juan.Rivera
(Work); Samsonoff at 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)?
----- Original Message -----
From: "Juan Rivera" <juan-rivera at sbcglobal.net>
To: "John B. Stephensen" <kd6ozh at comcast.net>
Cc: <eagle at amsat.org>; "Bill Ress" <bill at hsmicrowave.com>; "Dave Black
(Home)" <dblack1054 at yahoo.com>; "Dave Black (Work)"
<dblack at mail.arc.nasa.gov>; "Dave hartzell" <hartzell at gmail.com>; "David
Smith" <w6te at msn.com>; "Don Ferguson" <kd6ire at sbcglobal.net>; "Juan. Rivera
(Home)" <juan-rivera at sbcglobal.net>; "Juan.Rivera (Work)"
<Juan.Rivera at gd-ais.com>; "Samsonoff at Mac. Com" <samsonoff at mac.com>
Sent: Saturday, June 30, 2007 14:22 UTC
Subject: 10.7 MHz Spur
> 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
> 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
> surface. I get the strongest signal near the long trace between the two
> Freq inputs to U4 and U9, the two phased-locked loops.
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