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

[RW Mail List]

Hi all,

For static antenna direction finding, and for VNA use. Would it be possible 
to add a daughter board with one, two or three receivers to Hermes. This 
would also allow the VNA to have a separate through detector.

Best regards,

Roderick Wall, vk3yc.

-----Original Message----- 
From: Joe Martin K5SO
Sent: Tuesday, September 11, 2012 1:02 AM
To: HPSDR list
Subject: Re: [hpsdr] Will the Angelia blank PC Board be available...?

***** High Performance Software Defined Radio Discussion List *****

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
>>
>>
>> _______________________________________________
>> HPSDR Discussion List
>> To post msg: hpsdr at openhpsdr.org
>> Subscription help: 
>> http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
>> HPSDR web page: http://openhpsdr.org
>> Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/
>
>

_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at openhpsdr.org
Subscription help: 
http://lists.openhpsdr.org/listinfo.cgi/hpsdr-openhpsdr.org
HPSDR web page: http://openhpsdr.org
Archives: http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2221 / Virus Database: 2437/5260 - Release Date: 09/10/12 



-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2012.0.2221 / Virus Database: 2437/5261 - Release Date: 09/10/12


 1347331993.0