G8JNJ
About
- Username
- G8JNJ
- Joined
- Visits
- 4,629
- Last Active
- Roles
- Member
- Points
- 127
Reactions
Comments
-
&no_wf
-
Hi Ron, I wan't really suggesting any end use of the data, but simply thought that it would be possible to collect it. I'm not sure if what you are proposing would work, but it's an interesting concept. Edit - take a look at this page on the sire …
-
I had previously exchanged emails with Peter Martinez, G3PLX, on this subject, here are some more notes on the subject. http://jcoppens.com/radio/prop/g3plx/index.en.php I think it would be possible to use a KiWi to track the Ionosounders, the two…
-
I have found that If you set the AGC threshold value to -80dB it sounds a lot nicer on the Airband :-)
-
Hi Lonecrow Try http://g8jnj.proxy.kiwisdr.com:8073/ It's a very quick and nasty lashup which is lying on the floor of my workshop so there is a lot more unwanted noise and hash than there should be. VHF 144MHz band antenna, 100m of coax to works…
-
I think JWC is mainly a training / simulation facility. Although the JWT site will carry NATO traffic, it's primary focus is likely to be support Norwegian defense forces.
-
Hi John, The site is complicated because it was a WWII fortification, possibly part of the Atlantic Wall defenses, so some of the features are confusing. There are a lot of short lattice towers angled over at about 30 degrees to tension fan dipole…
-
And another site to add to the TDoA markers list (Image) Regards, Martin - G8JNJ
-
Hi Lonecrow, You could add a VHF down convertor ahead of the KiWi to shift a block of frequencies say 110 to 140MHz down to 0 to 30MHz. The KiWi has a function to re-label the frequency scale to match the original frequency. It's something I had t…
-
It coukd be that the admin has removed the listing from Sdr.hu or it may be that sdr.hu can't connect on the url that was originally listed. Send an email to the KiWi admin as they may not know this is happening. Regards, Martin - G8JNJ
-
It's an option available to the KiWi Admin. Users can't add or ammend entries but would usually welcome any information passed to them by using the email admin link in the yellow block linked stats page. Regards, Martin - G8JNJ
-
Link-11 https://www.sigidwiki.com/wiki/Link-11 Used by NATO forces to pass tracking information to / from aircraft to ships etc. Regards, Martin - G8JNJ
-
@evawilson11 It's a mixture of topics related to the KiWi WEB SDR. http://kiwisdr.com/ This thread is mainly related to trying to identify an mystery signal heard by Lonecrow that may, or may not, turn out to be local interference rather than a…
-
Just realised that you need to be logged into the WSPRnet website to be able to view the previous link. Here's the text Regards, Martin - G8JNJ Station Info DP0GVN is located at the German Neumayer Station III Antarctic research station at 70…
-
It's a Red Pitaya http://wsprnet.org/drupal/user/111886 Regards, Martin - G8JNJ
-
I think it's fixed too. I was averaging three to four good sats, but now it's typically seven or more. Maybe less frequent version releases (and associated restarts) have also helped to reveal the problem ? As previously there was a new release alm…
-
Hi J-Luc, Welcome back, you have been missed as your location is very good for TDoA because there are few other KiWi's out to the South West of Europe. I'm surprised there are so few in France. There is also CX006SWL javaradiofrance.ddns.net:80…
-
It's NMF Boston, which I think is transmitted from Otis Air National Guard Base 41°38'30.0"N 70°33'00.0"W (Image) The ITU seem to think it is too, but we could both be wrong, as they have a tendency to move TX sites around and not updat…
-
Yes that's the idea. When you run the probe near the offending item(s) you should see the same sort of pattern on the KiWi as you would observe if the same interference was present when you had your antenna connected. The signal levels may be diff…
-
@Lonecrow The oscilloscope you see in the video is actually a spectrum analyser. It shows the amplitude (strength) of the signal with respect to time, like a much faster and much more expensive version of the KiWi spectrum display. It's just hand…
-
Ooops, I should also have added this YouTube link which shows you how to use them. https://youtu.be/ctynv2klT6Q Although this shows them being used with a printed circuit board, you can do the same thing with power supplies, cables, PC's etc. Jus…
-
@ Lonecrow Looking back over some past notes, I think it's likely to be noise from Ethernet data. I was reminded about this when I tried my KiWi around 18MHz and found some weak signals similar to what you are observing, as I'd previously manged t…
-
Hi Dave, I think it's just one of the many STANAG variants utilising ARQ rather than being a continuous broadcast. http://i56578-swl.blogspot.com/2015/08/most-important-hf-milcomms-standards.html If you listen long enough you may find that it bec…
-
The RSSI value is likely to be derived from the recieved signal strength and may just be an arbitary value. The SNR value is more likely to be directly related to C/No. In order to convert it to C/No you need to calibrate the receiver against a kno…
-
Hmm, that look like interference too. If you zoom out you can see lots of reguarly spaced signals that are almost certainly local interference. I'm not saying that it isn't genuine, but I'm still not convinced. The 15-25MHz region is generally fa…
-
Can you hear it on any other KiWi's that are near to you ? If you can't, it's likely to be local interference, especially on the higher frequency bands. Regards, Martin -G8JNJ
-
Yeh, I see the variation in signal levels, somethings not right with the antenna, the KiWi doesn't have any auto gain control. I heard the signal, but to be honest it sounds like local interference. I think sorting out the antenna problem is the fi…
-
It takes a bit of practice and a basic understanding of propagation on different frequencies before you start getting good TDoA results. Try some of the lower frequency known signals first to gain some experience. Nils posting is a good read too …
-
@Lonecrow There is a workaround for non amateurs described in the KiWi quick start guide "Registration on sdr.hu On the sdr.hu tab are the parameters for sdr.hu registration. To obtain an API key go to sdr.hu/register and fill-out the form.…
-
OK, that's not good. However I'm sure it was just coincidence that it happened to be tuned to that frequency when it went faulty. Hope you fix it without too much difficulty. Regards, Martin - G8JNJ