[hpsdr] Calibration using Excalibur controlled by 10Mhz GPS

[Graham / KE9H]

  Merv:
You should not have to touch the correction factor with Excalibur and
an accurate 10 MHz source.
--- Graham


On 10/12/2010 9:33 AM, Merv Thomas wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
> I have set up my Excalibur board to feed a 10Mhz GPS signal into the Atlas 
> Bus.  In Power SDR(KD5TFD 6Sept2010 - derived from V1.10.4 + Base SVN2025) I 
> have ticked Excalibur in the set up and it correctly greys out the Mercury and 
> Penelope as options but when I transmit on CW at 14.310000 Mhz into a dummy 
> load and sniff the RF and measure the transmitted frequency it is transmitting 
> on 14.310600 Mhz - why is this please?
>
> To correct it I inserted an HPSDR Frequency Correction factor of 0.9999581000 
> and applied it which then moved my VFO frequency to 14.310600 Mhz.   After 
> re-setting the VFO to 14.310000 Mhz it now transmits on exactly 14.310000 Mhz.
>
> Is this required?   I would have thought that the mere act of controlling it 
> with an accurate GPS 10Mhz signal would have ensured a correct transmit 
> frequency? GPS is a HP Z3801A.
>
> Will be interested to learn from the "gurus" please.
>
> Merv  VK6BMT e-mail vk6bmt at iinet.net.au
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