[hpsdr] CASMIR HF and HORTON HF Microdesigns v 4.1

[Alex]

Given the fact that;
(a) CASMIR has been split into HF and VHF+ versions
(b) CASMIR HF is re-using design elements from JANUS
(c) That the band filters and all amplification except the pre-driver has been moved to another to-be-named board

I have modified the design for CASMIR HF, and have used the rest of the JANUS design to produce a design for HORTON HF.
Both are in PDF format for your comments (http://www.hamsdr.com/personaldirectory.aspx?id=375)

CASMIR HF DESIGN NARRATIVE:

I/Q PWM data is received from OZY and is routed by the MAX II via low pass filters to the PI5V331 QSE.
The output of the QSE goes through a pre-driver amp to the RF Output connector. The output of the pre-driver amp
is monitored by an AD8317 which control the output level of the pre-driver. 
The AD8317 itself is controlled by an AD7294 12-bit multichannel DAC/ADC for monitor and control. The AD7294 also controls the driver and push-pull amps in the to-be-named filter and 100w amp board. The AD7294 communicates status back to the MAX II and thus back to the host computer via OZY. 
The MAX II also controls the filter selection via a separate I2C bus, and provides futher trasmit sequencing (relay control, lights, etc.)
 on the Filter Control & Transmit Sequencing connector.

The LO is under design.


HORTON HF DESIGN NARRATIVE:

RF signals that have passed through the proper band filter come through the RF Input connector are amplified and sent to the PI5V331 QSD.
The I/Q Output of the QSD passes through low pass filters to the AK5394A for DAC. The resultant data is sent to the MAX II which sends the data to the Host computer via OZY. The AK5394A is controlled by the MAX II. Control of the band filters is acomplished by the MAX II via the FIlter Control connector.

The LO is under design.


Comments, questions? Nothing prevents the group from putting out an improved version of CASMIR and HORTON at any time.
I'm not deliberately stomping on anyone's toes or raining on their parade. I just want to see some alpha boards for a complete transceiver design. These CASMIR and HORTON designs are incremental updates to the extensive hardware and software design work that was done on JANUS.

Alex, N3NP