[hpsdr] Excalibur/PowerSDR/HPSDR behavior questions

[Dan Quigley]

Something else I noted is that the HPSDR Freq correction factor on the
calibration tab of the HPSDR setup dialog should be reset (set to zero) if
you are using Excalibur.  The correction factor value is still active even
when it is selected as the 10MHz reference source.

Best,
Dan

-----Original Message-----
From: Phil Harman [mailto:phil at pharman.org] 
Sent: Tuesday, November 17, 2009 6:46 PM
To: John Ackermann N8UR
Cc: Dan Quigley; 'Open HPSDR List'
Subject: Re: [hpsdr] Excalibur/PowerSDR/HPSDR behavior questions

Hi Dan,

John is quite correct, you need 'a' 10MHz source (either Atlas, Mercury,
Penny or Excalibur) so that the 122.88MHz clocks on Penny and Mercury are
phase locked together. If not locked then you will have a frequency
difference between Tx and Rx.

There is no indication in PowerSDR that the TCXO's are not locked and,
depending on the frequecy error with/without lock you may no notice it.

In KISS Konsole V1.6 I added a check that a suitable 10MHz source has been
selected.

Actually checking for phase lock in the FPGA code would be simple to do so
we can indicate the actual status in PowerSDR and KK.

We are actually going to make some changes to the way we lock the TCXO on
Mercury to Excalibur and we can add checking for phase lock at the same
time.

That's a really nice feature so I'll add it to the 'to do' list.

73's Phil...VK6APH



> ***** High Performance Software Defined Radio Discussion List *****
>
> Dan, I *think* that Merc and Penny use the 10 MHz signal to lock their
> on-board 122.88 MHz oscillator.  If the 10 MHz goes away, the 122.88
> TCXO keeps free running, but the frequency may jump noticeably and Merc
> and Penny will no longer be locked together in frequency.
>
> John
> -----
>
> Dan Quigley said the following on 11/17/2009 08:36 PM:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>
>> ------------------------------------------------------------------------
>>
>> Happy to report that Excalibur is working great here in my shack.  A big
>> thank you to Graham and the rest of that team.   I have a couple
>> questions about how the PowerSDR/HPSDR system handles the 10Mhz
>> reference clock.
>>
>>
>>
>> What happens if Excalibur stops broadcasting its 10Mhz reference clock
>> onto the Atlas bus?   I didn't see an indication on PowerSDR or notice
>> that Mercury stopped receiving.   Is there a way in software to detect
>> and indicate what card is supplying the clock?
>>
>>
>>
>> Best 73's
>>
>> Dan (N7HQ)
>>
>>
>> ------------------------------------------------------------------------
>>
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