[hpsdr] Frequency tuning with Mercury/PowerSDR2025

[Phil Harman]

Its a bug in Mercury V2 code since V1 is OK . Will take a look at it now.

73's Phil...VK6APH

----- Original Message ----- 
From: "Bill Tracey" <bill at ewjt.com>
To: "David Woodhead" <dwoodhead at bms-inc.com>; "Bob McGwier" 
<rwmcgwier at gmail.com>; <hpsdr at lists.hpsdr.org>
Sent: Sunday, December 28, 2008 3:24 PM
Subject: Re: [hpsdr] Frequency tuning with Mercury/PowerSDR2025


> ***** High Performance Software Defined Radio Discussion List *****
>
> Spur reduction is disabled intentionally  - for Mercury it does not
> makes sense since all of the tuning can be done by adjusting the
> Mercury digital NCO in the FPGA to tune.    The cordic is deep enough
> that spur production does not seem to be a problem anymore, and the
> SR points from PowerSDR would not make sense for Mercury since
> PowerSDR calculates  those points  based on a specific DDS - they'd
> not match any spurs in the Mercury Digital NCO.
>
> Can you tell me the date show in the title bar -- the SVN string is
> pretty much useless because it's based on whatever .svn files you
> have running around your local machine, not the svn level at the time
> the code was built.
>
> Regards,
>
> Bill (kdtfd)
>
> At 08:54 PM 12/27/2008, David Woodhead wrote:
>>***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>Hi Bob,
>>
>>Sounds logical but the "spur reduction" feature is grayed out.
>>
>>David.
>>
>>-----Original Message-----
>>From: Bob McGwier [mailto:rwmcgwier at gmail.com]
>>Sent: Sat 12/27/2008 6:25 PM
>>To: David Woodhead; hpsdr at lists.hpsdr.org
>>Subject: RE: [hpsdr] Frequency tuning with Mercury/PowerSDR2025
>>
>>I suspect you need to go into the setup on PowerSDR and check the box that
>>says "spur reduction".  This really engages the software tuning which is
>>what is needed.
>>
>>Bob
>>
>>
>>ARRL SDR Working Group Chair
>>Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
>>NJQRP, QRP ARCI, QCWA, FRC.
>>"And yes I said, yes I will Yes", Molly Bloom
>>
>>-----Original Message-----
>>From: hpsdr-bounces at lists.hpsdr.org [mailto:hpsdr-bounces at lists.hpsdr.org]
>>On Behalf Of David Woodhead
>>Sent: Saturday, December 27, 2008 9:17 PM
>>To: hpsdr at lists.hpsdr.org
>>Subject: [hpsdr] Frequency tuning with Mercury/PowerSDR2025
>>
>>***** High Performance Software Defined Radio Discussion List *****
>>
>>I'm using Mercury with Phil's V2 code and SVN2025. Noticing that the
>>frequency tuning is acting strange....
>>
>>With a CW input at 7MHz and tuning the receiver in 1hz steps the frequency
>>only changes at the following transistions
>>7.000,041/042
>>7.000,100/101
>>7.000,158/159
>>7.000,217/218
>>
>>Looks like the min tuning step is ~ 60Hz
>>
>>Seems to vary with mode. Above was CWL.
>>
>>David.
>>KM5TZ
>
>
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