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

[Richard Hosking]

Dear all

I have been contemplating this further
The unit would cover HF
I would see the board as containing
LO (DDS? - I have a footprint for the AD9951 worked out tho I havent 
built the board)
divider (divde by 4 to give quadrature?)
Tayloe style mixer
opamps
front end filters (multiple LPFs - switched)

Would be interested in comments on each of these sections - the best way 
of implementing
I note a QSD idea at /repos_sdr_hpsdr/trunk/N4HY/Horton/QSD.pdf

How would this be controlled?

I have the svn downloaded - havent used this system before
Can I simply commit any changes/additions?
Presumably one has to be accepted and given a password


Richard


Ray Anderson 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.
>
> 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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