[hpsdr] PicoPSU

[KD5NWA]

Part 15 allows quite a bit of noise, and if the part is right next to
sensitive components then kiss it goodbye. You need a shielded and
properly bypassed power supply, add to that lots of toroid cores, and
bypass capacitors..

My plans are to buy a tiny PC case, Plan A; take the power supply apart,
and modify it to insure it is quieter than from the factory. If that
fails, then plan B; change the power supply to a different brand and
repeat plan A. Plan C, if sick and tired of looping through plan A and
plan B then replace the whole thing with a linear power supply.

On Fri, 2006-06-09 at 07:52 -0400, Philip M. Lanese wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Is the ubiquitous "This device complies with FCC Part 15 ... " stick-on label
> attached to these power supplies?
> 
> A good indicator as to how much 'gratch' you will have to overcome in sensitive
> RF environments.
> 
> Phil, K3IB
> 
> ----- Original Message -----
> From: "Christopher T. Day" <CTDay at lbl.gov>
> To: "Lyle Johnson" <kk7p at wavecable.com>; "Eric Ellison" <ecellison at comcast.net>
> Cc: <hpsdr at hpsdr.org>
> Sent: Thursday, June 08, 2006 11:34 PM
> Subject: Re: [hpsdr] PicoPSU
> 
> 
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > picoPSU-60-WI:
> >
> > Volts (V) Max Load (A) Peak Load (A) Regulation %
> > 5V 6A 10A 1.5%
> > 5VStand By 1.5A 2A 1.5%
> > 3.3V 6A 8A 1.5%
> > -12V 50mA 50mA 5%
> > 12V 400mA 450mA 3%
> >
> > Overload protection cuts in when either major rail > 200% Max
> > Load.
> >
> >
> > picoPSU-120
> >
> > Volts (V) Max Load (A) Peak Load (A) Regulation %
> > 5V 6A 10A 1.5%
> > 5VStand By 1.5A 2A 1.5%
> > 3.3V 6A 8A 1.5%
> > -12V 50mA 100mA 5%
> > 12V 7A 10A =
> > Switched Input
> >
> > Same overload protection.
> >
> >
> > Obviously, the higher power version(s) [there is also an 80W version]
> > provide the 12V by feeding through the switched supply; the real work is
> > in the 5V and 3.3V supplies. Unless one of the boards uses a lot of 12V
> > current, which Lyle was _not_ going to do, there is likely no difference
> > from our perspective => picoPSU-60-WI is the right one for us, I think,
> > subject to noise considerations.
> >
> >
> > Chris - AE6VK
> >
> >
> > -----Original Message-----
> > From: Lyle Johnson [mailto:kk7p at wavecable.com]
> > Sent: Thursday, June 08, 2006 8:11 PM
> > To: Eric Ellison
> > Cc: hpsdr at hpsdr.org
> > Subject: Re: [hpsdr] PicoPSU
> >
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > > The 60/80W (80 watts peak) version uses a variable dc input from 6 to
> > 26
> > > VDC input which would be ideal for mobile use or powering off a
> > > "station" power supply.
> >
> > This would be my preferred solution.
> >
> > It might be helpful to list the voltages and currents the supply is
> > capable of.  I suspect most of the power is +5V or +3.3V.
> >
> > > The 120 W version uses a fixed 12 V regulated power input and Chris
> > says
> > > it drops out at 13+ volts.
> > >
> > > Is 60W likely to be able to power 3 or 4 or more project boards?
> >
> > Yes.  If we have a Tx that runs power, it will probably run from 13.8
> > VDC or some other voltage, not supplied by or through the Atlas
> > backplane.
> >
> > > Also how many folks would be interested in this type of supply.
> >
> > If I knew it was sufficiently quiet to include a decent receiver in the
> > same box, I'd be very interested.  But if it is noisy, then for many
> > radio applications it wouldn't be suitable.  Like the old
> > liner-to-switching-to-linear 5V regulator exercise we went through with
> > the SDR-1000 back in '03.
> >
> > 73,
> >
> > Lyle KK7P
> >
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> 
> 
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-- 

Cecil
KD5NWA
www.qrpradio.com


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