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<P><FONT color=#000000><FONT size=2><FONT face=arial,sans-serif>There are some very good xverters for high bands, Kuhne and DEM are a couple. They have all the right spec's already and just need a good IF which HPSDR already has. Have not tried my 432 Kuhne but it is on 2do list for next vhf contest. </FONT></FONT></FONT></P>
<P><FONT color=#000000><FONT size=2><FONT face=arial,sans-serif>Tim W4YN<BR></P></FONT></FONT></FONT>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid">-----Original Message----- <BR>From: Máximo EA1DDO_HK1H <EA1DDO@HOTMAIL.COM><BR>Sent: Oct 5, 2011 7:08 AM <BR>To: getpri@t-online.de, o.orcinus@gmail.com <BR>Cc: hpsdr@lists.openhpsdr.org <BR>Subject: Re: [hpsdr] VHF/UHF transverter for HPSDR <BR><BR><ZZZHTML><ZZZHEAD>
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<DIV dir=ltr>Good idea.<BR>I agree that.<BR><BR>73, Maximo - EA1DDO<BR><BR><BR><BR><BR>
<DIV>> From: getpri@t-online.de<BR>> To: o.orcinus@gmail.com<BR>> Date: Wed, 5 Oct 2011 11:34:00 +0200<BR>> CC: hpsdr@lists.openhpsdr.org<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>> > ***** High Performance Software Defined Radio Discussion List *****<BR>> > <BR>> > On srijeda, 21. rujna 2011. at 23:18, Ante Vukorepa wrote:<BR>> > > 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>> > <BR>> > <BR>> > I've put together an initial block diagram for what i've had in mind:<BR>> > http://dl.dropbox.com/u/1702513/Block.png<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: hpsdr@openhpsdr.org<BR>> > Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org<BR>> > HPSDR web page: http://openhpsdr.org<BR>> > Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/<BR>> <BR>> <BR>> _______________________________________________<BR>> HPSDR Discussion List<BR>> To post msg: hpsdr@openhpsdr.org<BR>> Subscription help: http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org<BR>> HPSDR web page: http://openhpsdr.org<BR>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/<BR></DIV></DIV></ZZZBODY></ZZZHTML></BLOCKQUOTE></BODY><pre>
Tim O'Rourke
W4YN@ARRL.Net
Low Power Amateur Radio Rocks
Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
NHRA Life Member</pre>
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