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G8JNJ

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G8JNJ
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  • Hi Laszlo, It's still possible to add wider notch filters or band-stop filters as required.  They just become more complicated to make and set up correctly. I've attached plots of one example I quickly designed using ELSIE (free). http://www.tonneso…
  • Hi All, Mine is fully public 99% of the time. I don't think the bandwidth used is excessive, but I'm on a VDSL service with no user cap (as far as I'm aware). However it does get very high usage and sometime I have to kick users off so that I can lo…
  • Hi John, Some more notes on the subject can be found here. http://www.g8jnj.net/softwaredefinedradio.htm#970952309 Regards, Martin - G8JNJ
    in Status panel Comment by G8JNJ April 9
  • Works well on my iPad mini too. Thanks for adding this John. Regards, Martin - G8JNJ
    in Touch tested Comment by G8JNJ April 9
  • I have a BT Home Hub 5 which I had previously manually configured to port forward. When I removed the existing rules and tried the auto option the port forwarding seemed to setup OK, but the separate firewall rule didn't seem to load, so I had to ad…
  • Hi Ron, OK understood. It was just a thought.  My intention was to include a link to a static html page residing on the Kiwi from one of the text areas on the KiWi that can include html commands. I may continue with my current solution or alternativ…
    in Antenna detail Comment by G8JNJ April 3
  • Hi Jim, Rather than placing your webpage on another server - could it just reside on the Beagle ?  I'm trying to do this as an experiment, but my Linux skills are somewhat limited :-( Regards, Martin
    in Antenna detail Comment by G8JNJ April 2
  • Hi Carl, I assume you are referring to my TC2M broadband vertical rather than the various loops I've also got on my SDR. Yes its possible to phase them to provide additional directivity (providing you have enough space to do it). The spacing would n…
    in Antenna detail Comment by G8JNJ April 1
  • I've managed to create a simple information page by leaving a black section to the left of my main header photo and then added HTML formatted text into the Photo description box on the config page. It's a bit crude, but it does show what can be done…
    in Antenna detail Comment by G8JNJ March 31
  • Hi John, Just a thought. Would it be possible to add an 'Information' web page to the KiWi so that folks could add more information about their location, antenna system (and switching if used) or any other stuff that may be of interest to the user ?…
    in Antenna detail Comment by G8JNJ March 30
  • Hi Serge, Not that good :-( Down 12.45 MbpsUp 0.45 MbpsPing 25.25ms Regards, Martin - G8JNJ
  • On my local connection I'd estimate that the KiWi lag is only about 200-500mS maximum.  Just about a long enough a delay to cause you to hesitate whilst speaking if you are monitoring your own transmission. Over the internet the delay can be much lo…
  • With the antenna disconnected the noise floor is relatively flat at around -105dB and I see NO obvious spurs at all. When the antenna is connected I do notice a slight difference when the Micro USB port is connected to a PC, but nothing else. I have…
  • Hi Ron, They are quite weak with me too. Not sure about the frequency offset, could it be due to the different tonal range of the language in use ? Regards, Martin - G8JNJ
  • I can also hear them fairly weakly on some of the Australian and New Zealand KiWi SDR's 10964KHz seems to be another active frequency this afternoon 13:30 UTC  Regards, Martin - G8JNJ
  • Hi John, OK - good job I checked as I'd misunderstood the meaning of the x. So just to double double check. In order of preference. P8 11 - GPIO 1_13P8 12 - GPIO 1_12 P8 13 - GPIO 0_23 P8 14 - GPIO 0_26 P8 15 - GPIO 1_15 P8 16 - GPIO 1_14 P8 17 - GP…
  • Hi John, Thanks for this it's very useful. Assuming I'm understanding the designations correctly and that any pins with an X against an orange background are not used. It looks like these are the best - listed in order of least conflict first. P8 27…
  • Hi All, OK looking through the document in more detail I think I have determined which pins are the ones to be avoided. Page 54 and page 74 of the Beagle system reference manual - assuming I'm looking at the correct one ?  http://beagleboard.org/sta…
  • Hi John, Thanks for this information. I have looked at the Beagle system reference manual but to be honest I couldn't find the relevant part. Kari's GPIO switcher uses P8 GPIO pins 70 -76 - do these conflict with anything else ? I have found that us…
  • Update. I tried using this method today but I could only fit two separate HDFL signals into a combined portion of the audio spectrum. The limitation is the bandwidth of a HDFL signal and the maximum SSB bandwidth (upper frequency of the passband) th…
  • Hi Dave, I'm out in the sticks so that helps a lot, but I don't think your noise floor is actually that bad. My remaining interference is proving a bit difficult to fix as it's mains borne but is being re-radiated by wire fencing. I'm gradually bond…
  • Hi Ron, It's HM01, Radio Habana in Cuba. One of the remaining numbers stations. The tones could be to trigger a recorder or similar at the RX. Regards, Martin - G8JNJ
  • What are you using to decode HDFL ? Can you set different center frequencies ? If you can here's a workaround. It involves using the same sound card but spacing the received audio from each SDR instance across the audio spectrum so that the received…
  • Hi Bill, Why not just add your actual location as part of your user ID in the "Your name or callsign" box at the top of the SDR page ? I notice that a lot of folks don't put any details in when they are using my KiWi which is a pity, as for the Admi…
  • Hi John, That seem to be a lot better - thanks. Martin - G8JNJ
  • Hi James, Your notches are doing a great job, as your SDR seems to be a lot happier now :-) Regards, Martin - G8JNJ
  • Hi Phil, There isn't a switching board as such. The software toggles some of the spare GPIO (70 -76) pins of the P8 connector on the Beagle.  When the switch software is used and an antenna is selected the appropriate GPIO pin goes from 0v to 3.3v. …
  • Hi All, Kari has performed some excellent work with his new extension. I've had the GPIO switching configured on my KiWi for the past week and it's working really well. Thanks again Kari :-) Regards, Martin - G8JNJ
  • Hi Laszlo, I'ts difficult to get hold of variable capacitors with a sufficiently large range of adjustment, which is why I suggested using a variable inductor instead. Try a search for "Polyvaricon capacitor" like the AM/FM tuning capacitor shown in…
  • Hi, The patch antenna supplied with the KiWi doesn't seem to be as good as some other GPS antennas. A lot of modern double glazing uses a metalised film to provide additional heat retention, but this also has the effect of greatly reducing the stren…