<div>A transverter would be great, even though i (personally) don't need one.<div>There's an issue of board estate, though…</div><div><br></div><div>If it were to be built with some kind of a pre-selector (or tracking filter) on its front end, it will take a not-so-insignificant portion of the board. Plus, there's the additional issue of providing and handling power levels suitable for transmission.</div><div><br></div><div>A single-board transverter would be awesome, but seeing if a usable down-converter is feasible first might be a good idea :)</div></div>
<div><br>-- <br>Ante Vukorepa<br>Sent with <a href="http://bit.ly/sigsprw">Sparrow</a><br></div>
<p style="color: #A0A0A8;">On srijeda, 5. listopada 2011. at 23:49, Mike Pate wrote:</p>
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<span><div><div>Georg,<br><br>I'm not opposed to your idea of developing a transverters but I for one, would like a VHF/UHF board for the Atlas for those of us who desire a single box solution. If I'm in the minority, then I will go with the HPSDF & transverter solution.<br><br>73's,<br>Mike / K5MAP<br><br>________________________________________<br>From: <a href="mailto:hpsdr-bounces@lists.openhpsdr.org">hpsdr-bounces@lists.openhpsdr.org</a> [<a href="mailto:hpsdr-bounces@lists.openhpsdr.org">hpsdr-bounces@lists.openhpsdr.org</a>] On Behalf Of Georg Prinz [<a href="mailto:getpri@t-online.de">getpri@t-online.de</a>]<br>Sent: Wednesday, October 05, 2011 4:34 AM<br>To: Ante Vukorepa<br>Cc: <a href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</a><br>Subject: Re: [hpsdr] VHF/UHF transverter for HPSDR<br><br>***** High Performance Software Defined Radio Discussion List *****<br><br>Hi Ante,<br><br>I would like to bring up following question:<br>Why not to develop a transverter for VHF/UHF? It would not only save<br>space on our limited Atlas backplane but also engineering power. For<br>those who don't need the TX-part could populate the RX-part only.<br><br>73, Georg, dl2kp<br><br><br><br>On Sa, 2011-10-01 at 22:52 +0200, Ante Vukorepa wrote:<br><blockquote type="cite"><div>***** High Performance Software Defined Radio Discussion List *****<br><br>On srijeda, 21. rujna 2011. at 23:18, Ante Vukorepa wrote:<br><blockquote type="cite"><div>1) using Si570 (high grade LVDS version, if possible) as the LO to<br>feed a high IP3 Mini Circuits frequency mixer, then filtering out<br>the higher "image" with a 500MHz-ish low pass filter<br>B1 is probably the best option for initial experimentation and my<br>own (not very demanding) purposes. So that's the route i think i'll<br>go, as soon as i catch some free time and start putting all this<br>down on paper. My plan is to try and design a down converter<br>consisting of fore-mentioned elements (Si570, frequency mixer,<br>filter) plus a microcontroller, that would fit an Atlas card and<br>would be controlled through the bus, via I2C. The vision is to have<br>the ability to bypass and turn all the elements, including the<br>microcontroller, off when not in use, so the impact on the existing<br>HF signal chain is minimal.<br></div></blockquote><br><br>I've put together an initial block diagram for what i've had in mind:<br><a href="http://dl.dropbox.com/u/1702513/Block.png">http://dl.dropbox.com/u/1702513/Block.png</a><br><br><br>The board will be 2-layer if possible (to simplify and cheapify things<br>initially), with one side dedicated almost purely to ground (separate<br>analogue and digital ground planes, of course, perhaps even a<br>completely separate plane for the Si570). Omron SMD signal relays will<br>be used for pre-amp and filter bypassing and oven control (control in<br>the sense of having it completely on or off, not in the sense of PWM).<br>An Atmega168 or 328 will control both them and the Si570 providing the<br>LO frequency. The Atmega will, in turn, be controlled via an I2C or<br>SPI line, by the other boards on the bus, or manually, via a front<br>control panel consisting of a rotary encoder, LCD and a few buttons.<br>The balun is there to convert the differential Si570 CML output and<br>suck out as much decibels as possible to feed a high IP3 frequency<br>mixer. The (optional) FM broadcast band-stop filter is there to kill<br>the interference from strong nearby FM towers, if needed.<br><br><br>How am i doing so far?<br><br>--<br>Ante Vukorepa<br>Sent with Sparrow<br><br><br><br><br>_______________________________________________<br>HPSDR Discussion List<br>To post msg: <a href="mailto:hpsdr@openhpsdr.org">hpsdr@openhpsdr.org</a><br>Subscription help: <a href="http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org">http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org</a><br>HPSDR web page: <a href="http://openhpsdr.org">http://openhpsdr.org</a><br>Archives: <a href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/</a><br></div></blockquote><br><br>_______________________________________________<br>HPSDR Discussion List<br>To post msg: <a href="mailto:hpsdr@openhpsdr.org">hpsdr@openhpsdr.org</a><br>Subscription help: <a href="http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org">http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org</a><br>HPSDR web page: <a href="http://openhpsdr.org">http://openhpsdr.org</a><br>Archives: <a href="http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/">http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/</a><br></div></div></span>
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