G8JNJ
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- G8JNJ
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Hi Ron, The reduction in IP products with improved amplifier balance are likely to be mostly 2nd order products. One trick you could try is to place a 1:1 voltage balun (a pair of bilfilar windings with the end of winding one connected to the sta…
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Active antennas tend to be popular with folks who don't have the space for larger antennas, or who need to site them away from local interference sources or maybe use the loop directivity to 'null' out local BC stations or other specific noise sourc…
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Hi, If you are only building one 'thin' loop don't make it too big a diameter. The natural noise floor on the LF bands is fairly high, so once you have a loop big enough to hear the noise on the LF bands there is no advantage in making it any bigg…
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This thread covers splitting GPS feeds. http://forum.kiwisdr.com/discussion/comment/3949#Comment_3949
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There were also some surplus GPS antennas on ebay that looked promising. https://www.ebay.co.uk/itm/HUBER-SUHNER-1315-17-0008-1575MHz-34dB-N-female-gps-antenna-antenne-Aerial/173430847115?hash=item286148b68b:g:84cAAOSwErFZxT39 https://www.ebay.co.…
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Yes, I've also tried some light weight aluminium air ducting which gives very good results. The problem with the loop was not the loop itself, but the support structure and loop mount, but I do live on top of a hill.... Regards, Martin - G8JNJ
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Yes, that's a brilliant write up with some good practical advice to help get the best results. Regards, Martin - G8JNJ
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Hi HF_ATL, As Ron has already said, if you can connect two or more loop in parallel, or use a 'Fat' loop you will improve the performance, especially on frequencies above 10MHz. You are aiming for as low a value of inductance as possible, combined…
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Forgot to add. This was previously mentioned in the TDoA success thread. I found a FSK signal with 500Hz shift on 12183KHz USB which I think comes from Istra near Moscow 55.884167, 36.953611 So this is pretty close to your TDoA plot too. Regards…
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Hi Dave, It's a fairly popular frequency, particularly with the Russians, and it could be that you are hearing (and trying to TDoA) a mix of transmissions emanating from more than one source at the same time. I'd suggest you join the utility monit…
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Hi John, The new map categories are good. I notice that when using Chrome on my iPad the black map background that the key is displayed against is entirely covered by the map when it opens up, making the key difficult to read against map backgroun…
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Another success today - I emailed Esteban, EA8DGL, and asked if he could enable his GPS as he's in a great location for TDoA in the Canary Islands just of the West coast of Africa. He very kindly did this today and he's now appearing on the TDoA ma…
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DHJ59, German Navy, Wilhelmshaven, Germany 53.677, 7.6120 Note - Not operating on LF 53KHz for site reference only
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Another thought WRT TDoA usage. Maybe folks using an 'admin' account or password would get priority over a TDoA request (or perhaps even general useage) and kick it ? This would allow folks like N6GN and others who use their KiWi's for other monit…
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DJH58 German Navy, Hurup, Near Glücksburg/Saterland-Ramsloh, Germany 54.7606, 9.5499 DHO26 German Navy, Near Rostock / Marlow, Germany 54.1438,12.5504 (Image)
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PBB, Dutch Navy, Den Helder 52.9192, 4.7436 http://southwest.ddns.net:8073/?f=6358.62iqz8&pbw=3160&ext=tdoa,lat:52.18,lon:4.21,z:6,G8JNJ,G0LUJ,F1JEK,DF0KL,DC9FD (Image) PBC also annotated on results map. Regards, Martin - G8JNJ
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That's why I find I'm using use the TDoA map, it's easy to double click and bring up a number of KiWi's in fresh tabs, then just close the ones that are no good.
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"Some of the good-SNR Kiwi owners might not have seen the point of installing the GPS antenna originally. Perhaps all we have to do now is ask if they'll reconsider." Agreed, I think it would be a good idea for KiWi Users and Admins to em…
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"How does anyone feel about the possible addition of a limit to how many receivers may run TDoA" Seems like a sensible idea to me. There may also be potential political problems in some countries e.g. if a KiWi on 'their' territory is us…
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Aarhus - Danish navy 56.1228, 10.2068
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HFDL transmitter sites - very often shared with other aero comms Ground Station ID 1 SAN FRANCISCO - CALIFORNIA Longitude 121 45 34 W Latitude 38 22 48 N Ground Station ID 2 MOLOKAI - HAWAII Longitude 157 10 46 W Latitude 21 10 47 N Ground …
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I'm pretty impressed with this one which is easily within 10Km STANAG on 12668KHz using http://southwest.ddns.net:8073/?f=12668.41iqz8&pbw=1620&ext=tdoa,lat:43.36,lon:2.17,z:9,map:1,DF0KL,CS5SEL,G8JNJ,LA3SP,SA0CAM,SV8RV,FUG (Image) Rega…
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Hi John, "Maybe the Kiwis should push status updates on more than a fixed schedule? " That seems like a sensible idea. "When the TDoA map is available could it be shown as default instead of the original KiWi selection map ?" …
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Hi John, It was still doing it occasionally with v1.208. I'll let you know if I see it again with v1.209 onwards. Regards, Martin - G8JNJ
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Hi John, "I have been working on your auto-retry idea" Great that's really good. However thinking about it a bit further......... I think all KiWi's that are on-line need to be shown on the map, but the ones that are fully occupied or …
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FSK with 500Hz shift 12183KHz USB Istra near Moscow 55°53'03.0"N 36°57'13.0"E https://www.cia.gov/library/readingroom/docs/CIA-RDP78T04563A001000010071-8.pdf More Russian sites listed here. https://www.cia.gov/library/readingroom/docs/…
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I haven't TDoAed the two VLF sites, but I thought it was worth adding them to the map prior to trying. Wilhelmshaven is the result of a TDoA of a STANAG transmission on 12176KHz USB. Unfortunately I didn't save the setup. Regards, Martin - G8JNJ
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Chayka transmitter Simferopol, RSDN-3 44.88895, 33.87334 Chayka transmitter Slonim, 2nd station of RSDN-3 53.132, 25.396111
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DHJ59 (Wilhelmshaven GER) 53.677, 7.612
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Hi John, The latest additions are really great :-) The map is looking a bit crowded now that more TX sites have been added. Would it be possible to be able to tick box switch these on / off as required ? Regards, Martin - G8JNJ