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

[Phil Harman]

Hi Tom,

Thanks for the feedback.  The amplitude is flat to within +/- 0.01dB, we
can thank Warren for that since its a requirement for PureSignal
operation.

73 Phil...VK6PH




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>
>
>
> 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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