[hpsdr] VHF/UHF transverter for HPSDR

[Georg Prinz]

Hi Tim,

with the same argument we can drop the downconverter, too!

73, georg, dl2kp


On Mi, 2011-10-05 at 09:53 -0400, Tim O'Rourke wrote:
> 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. 
> 
> Tim W4YN
> 
> 
>         -----Original Message----- 
>         From: Máximo EA1DDO_HK1H 
>         Sent: Oct 5, 2011 7:08 AM 
>         To: getpri at t-online.de, o.orcinus at gmail.com 
>         Cc: hpsdr at lists.openhpsdr.org 
>         Subject: Re: [hpsdr] VHF/UHF transverter for HPSDR 
>         
>         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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>         
> 
> Tim O'Rourke 
> W4YN at ARRL.Net
> Low Power Amateur Radio Rocks 
> Member of Flying Pigs,ARCI,GQRP,RSGB,ARRL Life Member
> NHRA Life Member



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