[hpsdr] Proposal for a 'low-end' RX/TX board for HPSDR

[Philip Covington]

On 7/21/06, Ray Anderson <ray.anderson at xilinx.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
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> I've been contemplating the design of a 'low end'  receiver/transmitter
> board to plug into the ATLAS back plane.
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> This definitely would not compete with the cutting edge technology destined
> for CASMIR/HORTON/MERCURY but would leverage existing work done in the SDR
> community by utilizing a receiver  similar to a SoftRock 6.0 receiver or
> possibly one of the YU1LM designs. The transmitter would be similar to the
> one YU1LM or others have proposed and built. The goal is one of providing a
> relatively low cost alternative RX/TX choice for the HPSDR architecture.
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>  I am thinking of including either a DDS (similar to DDS-60) or PLL
> synthesizer  with an onboard PIC processor to drive a LCD display and knob
> encoder. There could be provisions to allow serial control of the
> synthesizer via I2C or similar from Sasquatch if it were present in lieu of
> the knob encoder. The synthesizer would either have it's own reference
> oscillator onboard or have the option to utilize an external  10MHz clock
> coming from another HPSDR board if desired.
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> The IQ output of this proposed receiver would feed into JANUS. The PWM
> quadrature audio from JANUS would also be used to drive the proposed
> transmitter.
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> I think the TX, RX, synthesizer and PIC processor will all fit on a single
> 100mmx120mm form factor HPSDR board. A minimal system using this board would
> consist of this board, a JANUS  and a OZY.
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> This is still in the conceptual stage. Many details to be worked out yet.
> Comments and feature wishlists will certainly be considered.
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> I'm planning on calling this board the Phoenix  after the mythological
> Phoenix bird as it will be a rebirth of several existing SDR designs into a
> new HPSDR module.
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> After a bit more contemplation I'll have some initial block diagrams ready
> in a couple days.
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> -Ray     WB6TPU

Hi Ray,

Sounds good.

I have a circuit for a proposed QSD-like design (actually a sampling
integrator) using some simple components.  If you are interested I can
email you a schematic.  I think Bob N4HY has been working on a QSD
also.

73 de Phil N8VB

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