[hpsdr] Hermes schematics -- comments

[David McQuate]

Hermes_RevA5-3.pdf        WOW!

A confusing choice of wire labels--
On sheet 7, Line Out (L & R) from the TLV320 are labeled  "RLINEIN" and 
"LLINEIN"
but that's because they connect to the Line In pins on the TPA0202 audio 
power amp.

Minor glitches--

(1) both JP4 and JP5 are labeled "MIC BIAS".
JP4 should be labeled something like "MIC_AUD", as on Penelope

73,
Dave
wa8ywq

Phil Harman wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> All,
>
> As Kevin has recently advised, the schematic for Hermes is available 
> for peer review on the HPSDR Wiki here:
>
> < http://openhpsdr.org/wiki/index.php?title=HERMES >
>
> The preparation of the schematic has been a Herculean effort by  Tony 
> Taylor who is also about to design the PCB. I like to thank Tony for 
> all the work he has done to date and the effort he is about to 
> undertake on the PCB.
>
> Tony has been ably assisted by  Kevin M0KHZ and yours truly. I'd also 
> particularly like to reconise the contributions by Graham KE9H in 
> relation to the low power Tx stages, changes to the grounding of the 
> Mercury front end and his Exchalibur 10MHz clock driver.
>
> Hernes looks like it will be a most exciting HPSDR developemt having 
> the following features:
>
> - Single board DDC/DUC HF full duplex transceiver
> - Mercury type DDC receiver with 10dB NF and coverage of  10kHz to 55MHz
> - Multiple independant receivers (from the same antenna) - 4 currently 
> planed
> - Penelope type DUC transmitter with 0.5w output from 160m to 6m
> - USB2 interface to PC with new Windows and Linux DSP software (to be 
> announced)
> - Direct connection to Alex board HPF/LPF filters and Tx/Rx switching
> - Direct connection to an alternative LPF filter + 20W PA + Tx/Rx 
> board ( to be announced)
> - 13.5v DC input
> - All clocks phase coherent to a high performance 122.88MHz reference 
> oscillator
> - Option for external 10MHz reference
> - High capacity Altera 3C40 FPGA for current and future enhancements 
> and features
> - On board  Altera  USB Blaster clone for FPGA programming
>
> Hermes represents one of the most complex and feature rich HPSDR 
> projects we have so far tackled.
>
> You can make a valuable contribution to the success of Hermes by very 
> carefully checking the schematic on the Wiki.
>
> Feedback and comments are welcomed via the reflector.
>
> 73's Phil...VK6APH
>
>
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