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<DIV>Hi Jonathan,</DIV>
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<DIV>We can GPSDO lock Hermes to a 10 MHz reference and also feed in a 1PPS so
you can indicate which sample occurred on the positive edge of this
signal. When in this mode the IPPS signal appears in the I&Q Ethernet
data stream in the LSBit of the microphone data.</DIV>
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<DIV>I added this feature for our Chirp Beacon decoder and it seems to work
OK.</DIV>
<DIV> </DIV>
<DIV>73 Phil...VK6APH </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=naylorjs@yahoo.com
href="mailto:naylorjs@yahoo.com">Jonathan Naylor</A> </DIV>
<DIV><B>Sent:</B> Thursday, July 26, 2012 6:29 PM</DIV>
<DIV><B>To:</B> <A title=simon@hb9drv.ch href="mailto:simon@hb9drv.ch">Simon
HB9DRV</A> ; <A title=dc6ny@gmx.de href="mailto:dc6ny@gmx.de">'Helmut,
DC6NY'</A> ; <A title=werner.karn@googlemail.com
href="mailto:werner.karn@googlemail.com">'Werner Karn'</A> ; <A
title=bruce.beford@myfairpoint.net
href="mailto:bruce.beford@myfairpoint.net">'Bruce Beford'</A> </DIV>
<DIV><B>Cc:</B> <A title=hpsdr@lists.openhpsdr.org
href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</A> </DIV>
<DIV><B>Subject:</B> Re: [hpsdr] Fwd: 1, 2, 3, 4, 5, 6, 7....</DIV></DIV></DIV>
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<DIV
style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">*****
High Performance Software Defined Radio Discussion List *****<BR><BR>
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<DIV><SPAN>I have professional experience with phased locked SDRs for DF work.
The ones that I/we use were custom made and cost a LOT of money, think BMW
M5.</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>The way ours work is that the receiver is fed with both a 10 MHz
GPSDO reference and a 1 PPS signal. The output data, via USB, has a timestamp
which is the number of microseconds from the last second marker. Each USB block
contains all of the data from the eight receivers, so that they're automatically
synchronised. Since we're also interested in time-of-flight the absolute time is
of interest to us as well as the relationships between the eight
channels.</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>The vertical antennas that we use aren't in a circle but in an
ellipse, based on a research paper from somewhere which works better than the
more obvious circle. This may be because our system works on spot frequencies
from around 4 MHz up to 18 MHz, and needs to provide DF data on all of them.
Anyway it works....</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>We can't afford any more receivers like the above, so if HPSDR can
provide something similar I think we could be interested in buying some, and I'm
sure we wouldn't be alone.</SPAN></DIV>
<DIV><SPAN><BR></SPAN></DIV>
<DIV><SPAN>Jonathan G4KLX (ex HB9DRD)</SPAN></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Simon HB9DRV
<simon@hb9drv.ch><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
"'Helmut, DC6NY'" <dc6ny@gmx.de>; 'Werner Karn'
<werner.karn@googlemail.com>; 'Bruce Beford'
<bruce.beford@myfairpoint.net> <BR><B><SPAN
style="FONT-WEIGHT: bold">Cc:</SPAN></B> hpsdr@lists.openhpsdr.org <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, 26 July 2012,
10:52<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [hpsdr] Fwd:
1, 2, 3, 4, 5, 6, 7....<BR></FONT></DIV><BR>***** High Performance Software
Defined Radio Discussion List *****<BR><BR>The solution I am looking at uses
GPS-locked receivers with data being<BR>generated on a specific PPS pulse, sent
over the internet to a central PC<BR>which determines the signal position. The
receivers should be the same, must<BR>be using the same central frequency and
sample rate.<BR><BR>Two years ago or so I bought four good Trimble Thunderbolts
via eBay for<BR>$100 a piece - I'm very glad I did that as these are now hard to
find.<BR><BR>Simon Brown, HB9DRV<BR><A href="http://sdr-radio.com/"
target=_blank>http://sdr-radio.com</A> <A href="http://dit-dit-dit.com/"
target=_blank>http://dit-dit-dit.com</A><BR><BR>You are standing at the end of a
road before a small brick building. Around<BR>you is a forest.<BR>A small stream
flows out of the building and down a gully. The sunspot count<BR>is
285.<BR><BR><BR>-----Original Message-----<BR>From: Helmut, DC6NY [mailto:<A
href="mailto:dc6ny@gmx.de" ymailto="mailto:dc6ny@gmx.de">dc6ny@gmx.de</A>]
<BR><BR>for diversity, beam steering, DF-application etc. you need
independent<BR>RF-channels in the frontend. That's the reason why Joe is using
up to four<BR>synchronized mercuries.
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