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

[Sid Boyce]

Hi Helmut,
DB1CC has a RF Return Loss Bridge on hiqsdr.org that's used with the 
HiQSDR in VNA mode.
I've just got to make the PCB's and put it together, the toroids are 
already on the pieces of coax.
73 ... Sid.

On 15/08/12 15:07, Helmut, DC6NY wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> 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. .
>


-- 
Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
Senior Staff Specialist, Cricket Coach
Microsoft Windows Free Zone - Linux used for all Computing Tasks


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