[Elecraft] S-Meter Calibration

[Bob McGraw - K4TAX]

 From my "chart on the wall", at 50 ohms,   4 mV is about -34.8 dBm and 
50 uV is -73 dBm.  Thus you will need an attenuator supplying some ~35 
dB of loss.

 From your numbers and starting at 40 mv  {-14.8 dBm}, using 3 
attenuators of 20 dB each will get "close".    As someone else suggested 
the XG3 would likely be a better choice.

73 Bob, K4TAX


On 8/5/2015 7:16 PM, Don Wilhelm wrote:
> Doug,
>
> That may work as long as the signal generator and the attenuators are 
> very well shielded.
> If the brand name were Agilent (used to be HP), I would say that it 
> would be well shielded, but I don't know about a product from the 
> "Siglent".
>
> You may do better to invest in the Elecraft XG3.  The calibration can 
> be automatic and painless when controlled by K3 Utility.
>
> 73
> Don W3FPR
>
> On 8/5/2015 6:41 PM, Doug Kingston wrote:
>> I have access to signal generator similar to this (
>> http://www.circuitspecialists.com/sdg830.html), but its minimum 
>> output is
>> 4mv.  The calibration calls for 50uV of signal.
>> It looks like I could set the output to 40mv (I don't like working at 
>> the
>> bottom of the range), and then attenuate the output with 3 20db
>> attenudators (e.g.
>> http://www.fairviewmicrowave.com/20db-fixed-attenuator-bnc-male-bnc-female-0.5-watts-sa01b-20-p.aspx) 
>>
>> in series which would reduce the voltage by a factor of 1000. Does this
>> sound like a viable plan?
>>
>> -Doug-, KD7DK
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