[hpsdr] Calibration using Excalibur controlled by 10Mhz GPS

[Henk Remijn PA5KT]

Do you have your CW-pitch at 600Hz?

Henk PA5KT


Citeren Merv Thomas <vk6bmt at iinet.net.au>:

> ***** 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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