[Premium-Rx] Receiver Frequency Display Accuracy & Calibration

[Peter Gottlieb]

I just tried the PC spectrum analyzer (Spectran).  There definitely 
seemed to be an offset in there as the 500 Hz WWV tone was showing up 
around 512 Hz or so.  However, it did show that LSB and USB were several 
Hz apart so I rechecked the master osc in my RF-350K and it was indeed 
off a bit.  It was high about 0.04 ppm.  I tweaked it to be right on (an 
academic proposition I am aware) and while Spectran still showed an 
offset at least now both sidebands matched.

My conclusion is that Spectran et al have their uses but I still want to 
use Racal freq counter running referenced to a rubidium standard for 
actually setting something.  The Racal 1992 with the high stability 
option is actually more than accurate enough without the Rb standard for 
any HF needs.

Peter


Ray Robinson wrote:
> Hi Gary,
> 
> 
>>What I do without any special freq standards or an accurately calibrated
>>freq counter/Spectrum Analyzer is to use a PC with a soundcard mode program
>>such as MixW which has a spectrum scope.
>>
> 
> It sounds great.
> I hope your arrangement is accurate and calibrated,
> and it performs to the makers specs and tolerances.
> 
> I have a deep misstrust of PC measuring systems,
> as I have been caught before,
> when software and hardware claim accuracies,
> which vary with PC interrupts,
> or are interploated between samples.
> 
> Regards
> Ray vk2ilv
> 
> 
>>-----Original Message-----
>>From: premium-rx-bounces at ml.skirrow.org
>>[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of Ahmet Gundes
>>Sent: Sunday, October 03, 2004 19:59
>>To: Premium-RX
>>Subject: [Premium-Rx] Receiver Frequency Display Accuracy & Calibration
>>
>>
>>Hi everyone.
>>
>>I would like to check the Frequency Display Accuracy of an HF Receiver. Does
>>anyone have any idea how we can check Receiver Frequency Readout Display
>>accuracy. What would be a good method, without the use of specialized
>>equipment, to verify that the 
>>Receiver freq redout is displaying the actual tuned frequency. Naturally
>>I'd like to get 1Hz accuracy if possible.  Can WWV, 
>>WWVH ,... time stations be used in doing this ?
>>
>>It would be interesting to hear from anyone who tried this before or have a
>>good idea on how to do it.
>>
>>Thank you,
>>Ahmet Gundes
>>
>>
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>>
> 
> 
> 
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