[hpsdr] VHF/UHF transverter for HPSDR

[Máximo EA1DDO_HK1H]

Good idea.
I agree that.

73, Maximo - EA1DDO

                                               


> From: getpri at t-online.de
> To: o.orcinus at gmail.com
> Date: Wed, 5 Oct 2011 11:34:00 +0200
> CC: hpsdr at lists.openhpsdr.org
> Subject: Re: [hpsdr] VHF/UHF transverter for HPSDR
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Hi Ante,
> 
> I would like to bring up following question:
> Why not to develop a transverter for VHF/UHF? It would not only save
> space on our limited Atlas backplane but also engineering power. For
> those who don't need the TX-part could populate the RX-part only.
> 
> 73, Georg, dl2kp
> 
> 
> 
> On Sa, 2011-10-01 at 22:52 +0200, Ante Vukorepa wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> > 
> > On srijeda, 21. rujna 2011. at 23:18, Ante Vukorepa wrote:
> > > 1) using Si570 (high grade LVDS version, if possible) as the LO to
> > > feed a high IP3 Mini Circuits frequency mixer, then filtering out
> > > the higher "image" with a 500MHz-ish low pass filter
> > > B1 is probably the best option for initial experimentation and my
> > > own (not very demanding) purposes. So that's the route i think i'll
> > > go, as soon as i catch some free time and start putting all this
> > > down on paper. My plan is to try and design a down converter
> > > consisting of fore-mentioned elements (Si570, frequency mixer,
> > > filter) plus a microcontroller, that would fit an Atlas card and
> > > would be controlled through the bus, via I2C. The vision is to have
> > > the ability to bypass and turn all the elements, including the
> > > microcontroller, off when not in use, so the impact on the existing
> > > HF signal chain is minimal.
> > 
> > 
> > I've put together an initial block diagram for what i've had in mind:
> > http://dl.dropbox.com/u/1702513/Block.png
> > 
> > 
> > The board will be 2-layer if possible (to simplify and cheapify things
> > initially), with one side dedicated almost purely to ground (separate
> > analogue and digital ground planes, of course, perhaps even a
> > completely separate plane for the Si570). Omron SMD signal relays will
> > be used for pre-amp and filter bypassing and oven control (control in
> > the sense of having it completely on or off, not in the sense of PWM).
> > An Atmega168 or 328 will control both them and the Si570 providing the
> > LO frequency. The Atmega will, in turn, be controlled via an I2C or
> > SPI line, by the other boards on the bus, or manually, via a front
> > control panel consisting of a rotary encoder, LCD and a few buttons.
> > The balun is there to convert the differential Si570 CML output and
> > suck out as much decibels as possible to feed a high IP3 frequency
> > mixer. The (optional) FM broadcast band-stop filter is there to kill
> > the interference from strong nearby FM towers, if needed.
> > 
> > 
> > How am i doing so far?
> > 
> > -- 
> > Ante Vukorepa
> > Sent with Sparrow
> > 
> >  
> > 
> > 
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> 
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