[hpsdr] Hermes upgrade to V2.6 - good results

[Gregory Ratcliff]

Tom,

Sounds interesting.   What are you sending that is so wide?

I look at hermes often and think of it like a very general toolset for rf.  Lots of ideas start with...."I wonder if I could use the hermes hardware for this?"



Greg

Sent from my iPad

> On Mar 31, 2014, at 4:28 AM, Tom McDermott <tom.mcdermott4 at yahoo.com> wrote:
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 
> Upgraded Hermes to V2.6 last night. Process went smoothly, no apparent issues. Still using HPSDR Programmer 1.6 which continues to work flawlessly on an old WinXP box (with PCAP).
> 
> In testing V2.3 and V2.6 - am impressed with the improved functionality of the Hermes transmit chain.
> 
> In V2.3 the passband response was approximately sin(x)/x, with some aliasing near +/- 24 KHz.  Transmitting a +21 KHz baseband signal generated some -27 KHz alias content for example. For most ham baseband applications, none of this matters of course.
> 
> In V2.6 the transmit response is very impressive.  Flat amplitude out to near 24 kHz, and not able to see the generation of any aliasing components when sweeping out to +/- 24 KHz baseband. For certain unusual applications the flattened transmit chain is most welcome improvement. Thanks to Phil et al. for this nice upgrade to the FPGA code.
> 
> -- Tom, N5EG
> 
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