[hpsdr] VHF/UHF transverter for HPSDR

[Ante Vukorepa]

A transverter would be great, even though i (personally) don't need one.
There's an issue of board estate, though…

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.

A single-board transverter would be awesome, but seeing if a usable down-converter is feasible first might be a good idea :)  

--  
Ante Vukorepa
Sent with Sparrow (http://bit.ly/sigsprw)

On srijeda, 5. listopada 2011. at 23:49, Mike Pate wrote:

> Georg,
>  
> 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.
>  
> 73's,
> Mike / K5MAP
>  
> ________________________________________
> From: hpsdr-bounces at lists.openhpsdr.org (mailto:hpsdr-bounces at lists.openhpsdr.org) [hpsdr-bounces at lists.openhpsdr.org (mailto:hpsdr-bounces at lists.openhpsdr.org)] On Behalf Of Georg Prinz [getpri at t-online.de (mailto:getpri at t-online.de)]
> Sent: Wednesday, October 05, 2011 4:34 AM
> To: Ante Vukorepa
> Cc: hpsdr at lists.openhpsdr.org (mailto: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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