[hpsdr] Penelope / Hermes use as VNA: Driver problems?

[Raj Dewan, N2RD]

I have a question regarding use of Hermes or Penelope/Mercury as a VNA.  
I had heard that the driver in both of these was sensitive to low 
impedance and would possibly be damaged if shorted.  How would that 
affect the use as a VNA as a shorted load is a standard calibration.  
Does one need a pad or is one built in to deal with this issue?

Raj, N2RD
Owner of Penelope/Mercury, Hermes ordered. .

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Raj Dewan, N2RD
FN13fc


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