[hpsdr] Duplex and Full Duplex

[John Melton]

And I am also running full duplex in the TX code I am working on in 
ghpsdr so I can monitor the signal using Mercury.

I am thinking of making this an option in the code so I can run 
satellite using a 2 Mtr transverter and a 70 cm Transverter.

-- John g0orx/n6lyt


On 07/23/09 14:41, Henry Vredegoor wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Well I see Phil already answered that question.
> 
> He should know....... ;-)
> 
> 73's,
> 
> Henry.
> 
>> -----Original Message-----
>> From: hpsdr-bounces at lists.openhpsdr.org 
>> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Henry 
>> Vredegoor
>> Sent: donderdag 23 juli 2009 15:38
>> To: 'Richard Ames'; hpsdr at openhpsdr.org
>> Subject: Re: [hpsdr] Duplex and Full Duplex
>>
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>>
>>
>> I'm almost sure at this moment it can not work in this way.
>> I think the whole system simply wasn't designed and 
>> implemented with duplex
>> in mind (?)
>>
>> I think you would have to check each functional block in the 
>> chain from
>> antenna to the loudspeaker and from the microphone to the 
>> antenna for this
>> operating mode.
>> If it could be MADE to work (It is SOFTWARE defined radio 
>> after all.... ;-)
>> ), is whole other question.
>> I think it would be difficult but probably doable
>>
>> Quick, first thoughts:
>>
>> PC (audio route): Yes it can
>>
>> Software (PowerSDR):
>> I think not, I think it would require some serious changes to make it
>> "aware" of a duplex situation.
>> Other software don't know.
>>
>> USB interface to/from Ozy: Yes it can
>>
>> Ozy itself: Same problem as Power SDR, it probably is not 
>> aware of a duplex
>> situation as well.
>>
>> Atlas Bus interface: Could be, would require different paths 
>> for RX and TX
>> data from Mercury and to Penny
>>
>> Mercury: Yes it could if it has it's own (Alex) RX path to the antenna
>>
>> Penelope: Yes it could if it has it's own (Alex) TX path to 
>> the antenna 
>>
>> Alex: Since it shares it's filters for RX and TX you would need two
>>
>> In general: The whole system has to be (logically) aware of 
>> this operating
>> mode and I think it currently is not.
>> Things like interlocking between RX and TX, a second (the 
>> duplex) frequency
>> (This is not VFO A and VFO B)
>>
>> Another issue would probably be performance of the various 
>> software parts,
>> including Ozy hardware (FPGA firmware)
>>
>> After having written down all this I would think the answer 
>> is not at the
>> moment, but maybe doable.
>>
>> But others can answer this much better than I can.
>>
>> 73's,
>>
>> Henry.
>>
>>
>>
>>
>>> -----Original Message-----
>>> From: hpsdr-bounces at lists.openhpsdr.org 
>>> [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Richard Ames
>>> Sent: donderdag 23 juli 2009 14:02
>>> To: hpsdr at openhpsdr.org
>>> Subject: [hpsdr] Duplex and Full Duplex
>>>
>>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> I was asked last night weather the HPSDR could do duplex....
>>>
>>> I didn't know how to answer.  I sure with separate receiver 
>>> and exciter
>>> and software clients you could rig it up to do this on separate
>>> frequencies.
>>>
>>> Can you do it with the receiver and exciter plugged it to 
>> one alex bus
>>> to receive and transmit at the same time???  Separate 
>> frequencies and
>>> antennas.
>>>
>>> Thanks, Richard.
>>>
>>>
>>>
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