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

[Ray Anderson]

I've been contemplating the design of a 'low end'  receiver/transmitter
board to plug into the ATLAS back plane. 

 

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.

 

 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.

 

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.

 

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.

 

This is still in the conceptual stage. Many details to be worked out
yet. Comments and feature wishlists will certainly be considered.

 

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.

 

After a bit more contemplation I'll have some initial block diagrams
ready in a couple days.

 

 

-Ray     WB6TPU

 

 

 

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