[hpsdr] Excalibur checkout

[Jim Keeth]

Jeff,

I've gone through some of the same frequency adjustment techniques as  
you're doing.  A couple of things I discovered...

1.  Some AM radio stations are GPS referenced and some are not.  K5CM  
on his web site (www.k5cm.com) has some stations listed in the TX, OK  
area.  I confirmed that WLW on 700kHz in Cincinnati is GPS  
referenced.  For best results, you need to be able to receive these  
during on the day on ground wave.    You can also check strong  
stations in your area.  If the phase vector on the PowerSDR is  
rotating the same direction at about the number or rpm, these  
stations are likely GPS referenced.  They may even respond to an  
email to confirm that.

2.  I've found using WWV on one of the higher frequencies is about  
the easiest and a fraction of a Hz error at 15MHz is a lot smaller  
percentage than it is at the AM broadcast band.  Doing your WWV  
calibration during the middle part of the day works best.

73,
Jim AF9A





----- Original Message -----
Graham,

Can I use standard broadcast stations to achieve the same test?
I guess I would have to confirm that they are on freq first.
I just did a quick test with a local sports station:

http://mysite.verizon.net/jkelly/hpsdr/phase/hpsdr.swf.html

Does this look right to you?

Jeff
KT2K



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