John,

 

The short answer is 'no'.  Click here 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); [email protected] 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]>; "[email protected] 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

> 

>