> On Oct 9, 2017, at 10:20 AM, jimlux wrote:
>
> I'm trying to come up with a relatively simple scheme to calibrate an HF
> antenna array - I've got a bunch of RTL-SDRs operating as a distributed array
> spread over a few 10s of meters.
>
> In terms of frequency, I think it should work fairly w
On 10/9/17 8:02 AM, Bob kb8tq wrote:
Hi
Pick a couple of local broadcast stations and record them. That will give you a
baseline
for each of the parameters you are after in real time. They *will* drift.
Past that, I’d go with a sweep of each node before installation. That will give
you the
fr
On 10/9/17 8:00 AM, Mattia Rizzi wrote:
Hi,
I did something similar when I had to deliver synchronization over IEEE
802.15.4-CSS (Chirp spread spectrum).
If you have SDR on both ends (TX & RX), you can use complex chirp signals
and then cross-correlation at RX. Just be sure that the multi-path is
On 10/9/17 9:58 AM, David Witten wrote:
Jim,
If I understand what you are attempting (I may well not), you might
consider the approach taken here:
https://github.com/tejeez/rtl_coherent
that is where you have a common clock distributed to the RTLs
"A single 28.8 MHz reference clock is distrib
Hi
One would *guess* that since it has the 702 antenna on it, it does have L1/L2
firmware enabled
in the receiver ( 701 = single L1 band, 702 = L1 / L2, 703 = L1,L2.L5 ). Indeed
the hardware
spans a wide range of “things” depending on the exact license keys you shoot
into it. Buying
those key
In message <6C47315934DF482EB10A679D10C09093@pc52>, "Tom Van Baak" writes:
>I'm guessing this product is
>mostly designed for the PN part of PNT (Positioning, Navigation, Timing)?
At least with the firmwares I have had a chance to test, that is clearly
the case. I don't know if they hav
Christopher,
Thanks for that additional information. Can you (or Gregory) also comment on
the external frequency input / output and the 1PPS output of this receiver?
A quick look at the om-2128.pdf and om-2129.pdf documents has words
like "better than 250 ns accuracy" and "50 ns increme
I have quite a bit of experience with Novatel hardware include OEM6, CPT
and SPAN.
CPT is an IMU made by KVH and relabeled by Novatel.The accelerometers
are MEMs and the roll rate sensors are FOGs. Pretty old design.
Performance is decent (but not auto alignment good).
http://www.kvh.com/Mi
Jim,
If I understand what you are attempting (I may well not), you might
consider the approach taken here:
https://github.com/tejeez/rtl_coherent
and here:
https://github.com/tejeez/rtl_coherent/blob/master/hardware/simple/README.md
or order a noise-source and antenna switches from here:
http
Hi,
I did something similar when I had to deliver synchronization over IEEE
802.15.4-CSS (Chirp spread spectrum).
If you have SDR on both ends (TX & RX), you can use complex chirp signals
and then cross-correlation at RX. Just be sure that the multi-path is not
killing you (i.e. the cross-correlati
Hi
Pick a couple of local broadcast stations and record them. That will give you a
baseline
for each of the parameters you are after in real time. They *will* drift.
Past that, I’d go with a sweep of each node before installation. That will give
you the
frequency response and (to some degree
I'm trying to come up with a relatively simple scheme to calibrate an HF
antenna array - I've got a bunch of RTL-SDRs operating as a distributed
array spread over a few 10s of meters.
The things I want to do are:
a) determine the phase/time offset between stations relative to other nodes
b) det
Hi Guys
I have just bought 2 kinds of PRS10 connectors on taobao.com. (PCB type and
cable type, refer to the attached photo). It is about 8$ each(the D-SUB +
center RF part). If you are looking for it, I can send you the link off the
list.
Yours
Li Ang / BI7LNQ
-- Ori
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