Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

G8JNJ

About

Username
G8JNJ
Joined
Visits
92
Last Active
Roles
Member
Points
18
Badges
0

Comments

  • 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…
  • Hi John, Understood, that's pretty much what I thought, but I wanted to ask as you had previously mentioned the memory allocation issue. Regards, Martin - G8JNJ
  • Hi Phil, They are parameters associated with the Automatic Gain Control. The idea of AGC is to try and maintain a reasonably constant listening level regardless of changes in propagation or local noise. The characteristics can be changed to suit per…
  • Hi John, I had a report regarding WSPR from David, G0MRF, one of my SDR users. "Last night I left it running for a while on 630m and when I returned 10 mins later, I saw  5100km as a distance.  Hooray....Martin has nice antennas and a quiet site !!H…
  • Hi John, I must confess that I hadn't realised (or read) about the option. That would seem to solve the problem, so I think this issue can be closed. Regards, Martin - G8JNJ
  • Hi John, Ah OK. I had only considered it to be an admin configurable off-set on a KiWi by KiWi basis rather than a global setting using stored cookies. Personally I'd avoid anything that relies upon connection to an external site at all costs. The r…
  • Hi James, Ah yes - I'd forgotten about that trick.  Using 4:1 or 9:1 transformers is also useful when building diode RF limiter circuits. I haven't had to worry about really narrow notches on the MW BC band, so I didn't need to do that for my filter…
  • Hi All, I would like to be able to switch antenna ports directly from the BB GPIO pins via the web interface and also change some text on the web interface if some of the BB GPIO pins are switched externally. Kari, OH1KK, has done a great job in wri…
  • Hi John, Just tried the new decoder and it seems to work very well. Now I can leave the KiWi running indefinitely on the local connection, I'll monitor it for the rest of the day and report back. Any further thoughts about being able to run WSPR in …
  • Hi All, I should have emphasised the point about choosing the appropriate L/C ratio. I suggest that you only use minimum depth of notch and narrowest notch width that you can get away with, in order to minimise the effect on nearby signals. Modellin…
  • Thanks John, That's really good :-) Regards, Martin - G8JNJ
  • Hi, If you take a look at the spectrum display, you generally need the strongest signals to be below the -30dB line. They can be slightly higher, but you may have problems if propagation changes and increases the signal level. If you want to have a …
  • Hi, Here's my fix. http://www.g8jnj.net/softwaredefinedradio.htm#970952309 Regards, Martin - G8JNJ
  • Hi James, This feature has already been requested as an enhancement. https://github.com/jks-prv/Beagle_SDR_GPS/issues/80 Please feel free to add any comments in order to add extra weight to the request. Regards, Martin - G8JNJ
  • Hi Ron, Nothing so sophisticated as a script :-) I import the JASON file into Excel then find and replace the more obvious %20 characters and such like. There are already a few open requests for enhancements regarding Tag handling , sorting, editing…