[hpsdr] Further thoughts on the Phoenix RX/TX architecture

[Bob McGwier]

Let me add that we can, and should, hang prototypes of these proposed 
mixers onto the Janus as proof of concept and that can be our "good" and 
that will be very inexpensive.  The ultimate performer will be a closely 
coupled system based on all we learn on oscillators,  A/D's,  mixers, 
front ends, etc. and that would be our "excellent" if I were "king".

Man, that is 4 cents!

73
Bob
N4HY


Bob McGwier wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> I absolutely agree completely with Alberto.   The cost difference 
> between what has been proposed for Excellent performance and good 
> performance is not sufficient (the same?) to justify doing anything 
> other than excellent.  Others are taking the risk of doing the tests on 
> these potential mixer circuits so there is no risk to the overall 
> projects ultimate outcome.
>
>
> Two more cents,
> Bob
> N4HY
>
>
>
> Alberto I2PHD wrote:
>   
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Ray Anderson wrote:
>>   
>>     
>>> .................
>>>  Phoenix was intended to have “Good” performance (much better than 
>>> adequate, but less than world-class). The goal was to design a 
>>> relatively low-cost entry level integrated HF TX/RX board that will plug 
>>> into the ATLAS backplane and work with the Janus and OZY boards to 
>>> achieve a vehicle that allows one to get ‘on-the-air’ with a minimum of 
>>> fuss.
>>> .................
>>> At this point in the genesis of the Phoenix design we need to make some 
>>> early decisions on which fork to take: a design utilizing Janus/OZY with 
>>> ‘Good’ performance, or a design using an integrated ‘Janus/OZY’ hybrid 
>>> interface that has the potential for ‘Excellent’ performance.
>>>     
>>>       
>>  > .................
>>
>> If the "Good" performance route will be chosen, a route that will require both the Janus and the OZY cards, which will 
>> be the plus side of that choice ? We know already what the minus side is, a reduced performance compared to the Horton 
>> card, but what about the advantages ? IMHO, the only advantage will be a small reduction in cost/price. Can this 
>> reduction be put down in numbers ? I don't think it will be significant, so the "Good" way, as opposed to the 
>> "Excellent" one, doesn't look as being much justifiable.  Just my two cents.
>>
>> 73  Alberto  I2PHD
>>
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>>   
>>     
>
>
>   


-- 
Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
(609)-924-4600
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