[hpsdr] Will the Angelia blank PC Board be available...?

[Joe Martin K5SO]

Hi Berndt, 

Yes, of course.  A rotating loop and sense antenna is one method, as you note.  Indeed, there are many schemes to perform direction finding, of course; doppler-based methods are yet another scheme, but neither of those are particularly well suited for high-accuracy direction-finding at HF with fixed antennas.  

Every DF scheme has it's own advantages/disadvantages, to be sure.  In my perhaps too hasty response I was considering the angle-of-arrival calculations I have already implemented in my DF PowerSDR program; in which case three phase-angle measurements are needed to unambiguously determine the angle of arrival from fixed position antennas at HF.  

If you desire to use a rotating loop and sense scheme with Angelia and write your own detection/display code for it, it could work, certainly.  My apologies.  Have fun!

73,  Joe K5SO


On Sep 10, 2012, at 8:46 AM, Berndt Josef Wulf wrote:

> G'day Joe,
> 
> only two antennas, loop and sense, are required with an automatic
> direction finder (ADF) as used in aviation and navy. Why wouldn't it be
> possible to implement using a dual channel software defined radio?
> 
> 73, Berndt
> VK5ABN
> 
> On Mon, 2012-09-10 at 07:46 -0600, Joe Martin K5SO wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>> 
>> 
>> On Sep 10, 2012, at 12:19 AM, RW Mail List wrote:
>> 
>>> ***** High Performance Software Defined Radio Discussion List *****
>>> I like the idea that Angelia with two antennas, will be able to reduce QRM/QRN and be used as a signal direction finder.
>>> 
>> 
>> Roderick, 
>> 
>> Keep in mind that to perform direction finding one needs at least three independent receivers/antennas.  Therefore the Angelia board with only two coherent receivers will not be able to perform direction finding functions by itself.  The earlier-mentioned "daughterboard" approach for Angelia to add an additional ADC for a third receiver is likely not going to be a practical approach due to lack of header connections to be able to support such a board on the Angelia PCB.  At least that's my understanding of the situation.
>> 
>> I know that Abhi is working on a design for a four-ADC receiver board for the Atlas bus that would do a great job for that application but it is still in the very early design stages presently I believe.  The board will almost certainly be a receive-only board but could be used with a Penelope/PennyLane transmitter, of course.  
>> 
>> 73,  Joe K5SO
>> 
>> 
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