[hpsdr] protocol 2 for Hermes

[Helmut]

Scott,

Thanks for info, but we do have the 2 relevant PTC 2A fuses, F2 and F3,  in
the voltage regulation circuitry. If the switched mode 5V regulator is
enabled, the (1,6A) current of the 5V rail is also flowing via fuse F2 on
the main DC rail (13-14V). Disabling the onboard SMPS and using a 5V
external source unloads fuse F2, but fuse F3 has still to carry full
current.

 

I personally couldn’t discover any issues running Thetis at highest sampling
rates, but my boards are carefully cooled, hi. On the other hand I noticed
the high CPU-load, Thetis and the fast Ethernet is producing. Perhaps that’s
the reason for the reported effects.

 

73, Helmut, DC6NY

 

Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Scott
Traurig
Gesendet: Donnerstag, 27. April 2017 12:44
An: hpsdr
Betreff: Re: [hpsdr] protocol 2 for Hermes

 

More details on the fuse problem are available here:

 

 
<https://apache-labs.com/community/viewtopic.php?f=17&t=2354&p=2381&hilit=fu
se#p2381>
https://apache-labs.com/community/viewtopic.php?f=17&t=2354&p=2381&hilit=fus
e#p2381

 

73,

 

Scott/w-u-2-o

 

 

On Thu, Apr 27, 2017 at 3:29 AM, Helmut < <mailto:dc6ny at gmx.de>
dc6ny at gmx.de> wrote:

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

Hi,

I agree with Marvin that no hardware modification seems necessary. Running
here Hermes from a 13.8V DC source, all onboard voltage regulators work fine
and sufficiently 'cool'.
RX and Tx functions seem ok after a quick test, but obviously DUP RX is
still cancelled due to the lack of room in the FPGA. In my eyes DUP for
real-time monitoring of the TX spectrum is indispensable. I repeat my
suggestion to use the feedback RX of Pure Signal for this purpose.

Thanks guys in advance.

73, Helmut, DC6NY


-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von John
Marvin
Gesendet: Donnerstag, 27. April 2017 06:51
An:  <mailto:hpsdr at lists.openhpsdr.org> hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] protocol 2 for Hermes

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

Note that as far as the power supply issue is concerned regarding the
original Hermes, I don't think there is any hardware change that needs
to be made to the board itself. It's a matter of setting the right
jumpers and providing an external supply capable of delivering both a
regulated 12V supply and a regulated 5V supply. The details regarding
this can be found in the Hermes manual.  So no SMD soldering is
required, but some external hardware changes will need to be made, the
difficulty of which will depend on your current power supply and the
case you are currently using.

It does sound like owners of original Hermes boards would need to do
some soldering to replace the resettable fuses. I'd certainly like more
details regarding that, since my primary transceiver is based on a TAPR
produced Hermes board and I would like to be able to run multiple
receiver slices at maximum sample rates, which would require the use of
1Gbit networking.

Regards,

John
AC0ZG

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