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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