[hpsdr] Janus Rev B Update

[vk4str]

Phil,

I would like to know how good the opposite sideband / carrier 
suppression in SSB mode is, have you measured that?

Looking forward to your draft. My preferred option would still be that 
the Janus board shows up as a soundcard in Windows OS.

73, Helmut

Phil Harman wrote:
> Helmut,
> 
> I have the prototype Janus breadboard running on my bench - it runs full 
> duplex fine. The PWM D/A converters in the FPGA work just fine also and 
> no reason to think this wont be a great satellite rig. If I get time 
> over the weekend I will post the latest draft of the protocol that we 
> are using over the USB - from that you will see that full duplex is not 
> a problem.
> 
>>
>> Hi Lyle,
>>
>> Nice job! However, as I have discussed before with Phil_H, this design
>> may not be full duplex capable, ie useable to work a satellite
>> transponder. I understand that PWM has certain limitations, please
>> correct me if I am wrong.
>>
>> The AK5394A is used for RX and the processed audio is output on the
>> speaker or headphone of the TLV320AIC23B.
>>
>> The TX audio is fed to the MIC input of the TLV with the only TX output
>> option being PWM. The Line-out cannot be used if the speaker is in use.
>>
>> Would a DAC for TX output not be a better option? I somehow dont trust
>> that the PWM option will be satisfactory for TX.
>>
>> 73, Helmut VK4STR
>>
>>

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