<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div><span>from the 'peanut gallery'...</span></div><div><span><br></span></div><div id="yui_3_16_0_ym19_1_1496015135041_11107"><span id="yui_3_16_0_ym19_1_1496015135041_11106">TWO ADC's would certainly tweak my interests...</span></div><div><span><br></span></div><div id="yui_3_16_0_ym19_1_1496015135041_11109"><span id="yui_3_16_0_ym19_1_1496015135041_11108">diversity, beam forming, etc, in the suburbs..</span></div><div><span><br></span></div><div><span>just sayin...</span></div><div><span><br></span></div><div><span>73, w5xz, dan</span></div><div id="yui_3_16_0_ym19_1_1496015135041_11110"><span><br></span></div><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1496015135041_11115" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;" id="yui_3_16_0_ym19_1_1496015135041_11114"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1496015135041_11113"> <div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11112"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1496015135041_11111"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Kjell Karlsen <la2ni@online.no><br> <b><span style="font-weight: bold;">To:</span></b> "hpsdr@lists.openhpsdr.org" <hpsdr@lists.openhpsdr.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, May 28, 2017 2:33 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [hpsdr] New Hermes 2M Board.<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1496015135041_11116"><br><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11117">***** High Performance Software Defined Radio Discussion List *****<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11118"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11119">Hi All.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11120"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11121">As Apache Labs has decided to stop the production of the Hermes board, we<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11122">have discussed to see if it is possible to get it produced by others.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1496015135041_11123"><br></div><div dir="ltr">I have for a long time thought of the possibility to improve the<br></div><div dir="ltr">construction and include some long wanted features. I am going to describe<br></div><div dir="ltr">the modifications I am thinking on. And of course we are open for other<br></div><div dir="ltr">ideas!<br></div><div dir="ltr"><br></div><div dir="ltr">We have got all the original layout files for Hermes from Abhi and that is<br></div><div dir="ltr">a good starting point.<br></div><div dir="ltr"><br></div><div dir="ltr">Endre Kiss, YO6OGJ is going to do the layout job. The first he is going to<br></div><div dir="ltr">do is to draw completely new schematics in Altium Designer. The physical<br></div><div dir="ltr">layout of the new board will follow the original as near as possible to be<br></div><div dir="ltr">sure that the good performance of Hermes is kept or even improved.<br></div><div dir="ltr"><br></div><div dir="ltr">The preliminary list of modifications follows:<br></div><div dir="ltr"><br></div><div dir="ltr">1: New PA giving 5W PEP output. By increasing the power output it can be<br></div><div dir="ltr">used to drive a LDMOS PA directly to >1KW output. I have tested 2 of the<br></div><div dir="ltr">newest 14V LDMOS transistors from NXP (Freescale) and they can give >5W<br></div><div dir="ltr">linear output, also on 50 MHz. With Pure Signal, the IM3 is >70 dBc at 5W.<br></div><div dir="ltr">Even at 145 MHz, the power out is >1W with good linearity.<br></div><div dir="ltr"><br></div><div dir="ltr">2: After a suggestion by Leif Aasbrink, SM5BSZ the DAC is going to give <br></div><div dir="ltr">full<br></div><div dir="ltr">output all the time and the drive regulation to the PA is done by using a<br></div><div dir="ltr">step attenuator after the first low noise amplifier. This will keep the<br></div><div dir="ltr">phase noise as low as possible in the TX signal. The same solution is going<br></div><div dir="ltr">to be used in Metis.<br></div><div dir="ltr"><br></div><div dir="ltr">3:Use the newest SMPSU chips for the power supply. The latest chips are<br></div><div dir="ltr">much more "silent" than the old and it is easier to suppress the spurs. By<br></div><div dir="ltr">using one for the 5V bus and one for 3,3V and run synchronously, we need<br></div><div dir="ltr">only 2 or 3 linear regulators in addition for the most critical systems so<br></div><div dir="ltr">the total power consumption can be reduced. It might also be possible to<br></div><div dir="ltr">use only one switcher delivering 3,3V. There are only a few circuits that<br></div><div dir="ltr">use 5V so just a small linear regulator is needed.<br></div><div dir="ltr"><br></div><div dir="ltr">4: Remove the ON/OFF switch from the board. In most systems the switch is<br></div><div dir="ltr">on another board or installed on the front separately. And we can use the<br></div><div dir="ltr">space for other parts.<br></div><div dir="ltr"><br></div><div dir="ltr">5. Add 2 meter operation on Hermes 2M by using under sampling. By <br></div><div dir="ltr">installing<br></div><div dir="ltr"> the 145 MHz BP filters on the bottom side of the board, the switching<br></div><div dir="ltr"> from HF to VHF should not introduce any extra spurs.<br></div><div dir="ltr">Including 70 MHz has been asked for but the restricted space forbids this.<br></div><div dir="ltr">And the chances to get extra spurs would increase.<br></div><div dir="ltr">As the new PA can give >1W even on 145 MHz, also TX is included.<br></div><div dir="ltr"><br></div><div dir="ltr">6 New FPGA. Phil, VK6PH is looking for a more modern FPGA to replace the<br></div><div dir="ltr">Cyclone III that is used today.<br></div><div dir="ltr"><br></div><div dir="ltr">7: There is a need for some more I/O´s. For ex. control output for use<br></div><div dir="ltr">with EER-PWM Power Amplifiers, interface to control an external ATU<br></div><div dir="ltr">(compatible with ICOM ATU)and so on.<br></div><div dir="ltr"><br></div><div dir="ltr">We are open for other ideas so please give feedback.<br></div><div dir="ltr"><br></div><div dir="ltr">The decision to start a production will be taken after the schematics are<br></div><div dir="ltr">completed and the cost is calculated.<br></div><div dir="ltr"><br></div><div dir="ltr">A few prototype boards has to be produced and tested and eventually <br></div><div dir="ltr">modified.<br></div><div dir="ltr"><br></div><div dir="ltr">When the construction is tested and found OK, we can make a list and<br></div><div dir="ltr">produce fully populated and tested boards. Also bare boards will be<br></div><div dir="ltr">offered for the brave ones.<br></div><div dir="ltr"><br></div><div dir="ltr">We also plan to make prototypes of a new Apollo board with 30W PEP out, <br></div><div dir="ltr">also<br></div><div dir="ltr">on 50 MHz and offer ready made boards without the inductors installed.<br></div><div dir="ltr"><br></div><div dir="ltr">At the moment there are no plans to make complete transceivers. But <br></div><div dir="ltr">combining<br></div><div dir="ltr">Hermes 2M with Apollo and the PiHPSDR controller, a complete transceiver <br></div><div dir="ltr">like<br></div><div dir="ltr">the one I showed at Friedrichshafen last summer is possible.<br></div><div dir="ltr"><br></div><div dir="ltr">We hope there are enough people that are interested in this. When I read<br></div><div dir="ltr">the reflectors, my impression is that there still are a lot of people<br></div><div dir="ltr">interesting in building their own equipment.<br></div><div dir="ltr"><br></div><div dir="ltr">73, Kjell<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">-- <br></div><div dir="ltr">Sendt med Operas e-postklient: <a href="http://www.opera.com/mail/" target="_blank">http://www.opera.com/mail/</a><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">HPSDR Discussion List<br></div><div dir="ltr">To post msg: <a ymailto="mailto:hpsdr@openhpsdr.org" href="mailto:hpsdr@openhpsdr.org">hpsdr@openhpsdr.org</a><br></div><div dir="ltr">Subscription help: <a href="http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org" target="_blank">http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org</a><br></div><div dir="ltr">HPSDR web page: <a href="http://openhpsdr.org/" target="_blank">http://openhpsdr.org</a><br></div><div dir="ltr">Archives: <a href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/" target="_blank">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/</a></div><br><br></div> </div> </div> </div></div></body></html>