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

[Helmut, DC6NY]

Hi Raj,

good question. I suppose you have to add a 10dB or better 20 dB pad into the
path. There is plenty enough dynamic in the system.

73 Helmut, DC6NY

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Raj Dewan, N2RD
Gesendet: Mittwoch, 15. August 2012 15:42
An: hpsdr at lists.openhpsdr.org
Betreff: [!! SPAM] [hpsdr] Penelope / Hermes use as VNA: Driver problems?

***** High Performance Software Defined Radio Discussion List *****

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. .

-- 
--
Raj Dewan, N2RD
FN13fc

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