G4DYA

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G4DYA
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  • Just tried opening two sessions on one Kiwi. Just opening the ALE extension in one session will drop the waterfall refresh rate in both sessions from 23 to 11 fps. Opening the extension in both will freeze both waterfalls.
  • A good solution is to talk to the farmer. If his fence is arcing to ground it may not do its job properly and livestock will go where they shouldn't. With the right approach he could see you as a useful ally who will give him early warning of a faul…
  • And there it is, implemented in the latest version, after just three days. Thank you very much indeed John. Richard
  • I've done some measurements on the frequency response of the Kiwi below 1 MHz. Using a -53 dBm tone (S9+20) from a calibrated signal generator, I got -53 dB on the S meter down to 50 kHz. It rolled off below that: 20 kHz: -1 dB 10 kHz: -3 dB 5 kHz: …
  • Wow. That's brilliant. Thank you very much indeed John.
  • Thanks, but I'm aware of how to change the passband. I was just suggesting that the *default* may be sub-optimal, and could be raised a little. IIRR the wide-AM default bandwidth was tweaked to 9.8 kHz following a request in this forum. It isn't a …
  • Resurrecting this old thread rather than starting a new one . . . Could the default be increased a little from 300-2700 Hz? It seems a bit narrow by today's standards. I often find myself dragging the bandwidth to 150-3000 Hz, but I think that would…
  • The HFCC (which coordinates HF broadcast assignments) tries to keep one frequency in each HF broadcast band in reserve for emergency use, which they call International Radio for Disaster Relief (IRDR). More here: http://www.hfcc.org/humanitarian/
  • I would like to see a variation where it is possible to clone a complete config *except* the IP address. (Is there even a situation where cloning the complete config *including* the IP address is wanted?) BTW I use static IPs.
  • OK thanks Powernumpty. I hadn't noticed an extra button in that row. (I never use the others.) Auto scale is fine most of the time, and very worth doing for the reasons John gave. Also, even if you do set sane manual defaults in the config, the nois…
  • Sorry if I'm being thick, but how do I get a "second popup menu in the waterfall tab"?
  • Thanks John. At first the two Kiwis were on different antennas, but a lot of users seemed to pick the wrong one for what they were trying to listen to, so I diplexed the antennas into a distribution amplifier and feed the RXs from that. I've done as…
  • I'm using a diplexer to combine a Wellbrook loop with a 27m horizontal terminated folded dipole (TFD). The crossover frequency is about 1.7 MHz. (I found the TFD marginally better on 1.8 MHz.) The TFD has notches for the 4, 6 and 7 MHz broadcast ban…
  • The BB version seems to be over-riding the Kiwi's network settings at boot and using DHCP regardless of whether it's configured for DHCP or static. If you're using a non-NATted static IP this can be very confusing. To get a static IP, it's necessar…
  • I'm attempting to provide cooling for a BBAI in a Seeed case. Without the end plates, two 5V 25mm fans side-by-side works well. First, I installed the AI but didn't use star washers next to the board - components are too close for comfort. Instead …
  • Thank you John for the BBAI version. I've followed your instructions at the top of this thread and it all worked. Only hint of difficulty was right at the end of the build, when it said: systemctl enable kiwid.service Synchronizing state of kiwid.s…
  • I wound the inductor on a T50-2 toroid. Quite a lot of turns, too many to count and I didn't keep a note! Regards, Richard G4DYA
  • Re. Martin G8JNJ's notch filter: I built one for 198 kHz using 26 uH in series with 24370 pF (10nF + 10nF +3900pF + 470pF all polystyrene) and found that the notch was 34 dB deep, which was more than necessary. I 'softened' it to 20 dB with a series…
  • Thanks for v1.303 but unfortunately with "Include Galileo" disabled it's still filling many of the 12 slots with Galileo satellites, meaning that I'm only getting 3-5 GPS sats with a good antenna outdoors in the clear. It would help if the…
  • Something is very wrong ... Lat/Long way out.
  • @jks: Excellent stuff - thank you.
  • There doesn't seem to be anything wrong with the PCTEL GPS-TMG-40N antenna's current draw. The data sheet says <=40 mA, and I've just measured mine at 23 mA, both well within the Kiwi's 50 mA current limit.
  • On second thoughts, I don't think my antenna is going deaf at times. The Kiwi seems to struggle to acquire sats when the server has been running for a few hours. Last night it had 11-12, but by this morning it was down to six. On restarting the serv…
  • I'm using a PCTEL 40 dB antenna and the voltage being fed to it by the Kiwi measures at 3.139 V. It seems to be working more or less OK although it does seem to go a bit deaf at times, so maybe I need to beef it up a bit.
  • When the four recently-launched Galileo satellites are available, the constellation will be nearly complete with 22 satellites in 24 slots (but no orbiting spares yet). At the moment the A plane has working satellites in all 8 slots, the B plane has…
  • This is what my shadow map looks like after 18 hours. As expected, there's not much low-elevation stuff in some directions because of trees. In other directions, where the optical horizon is 20+ km away, satellites are being received at elevations a…
  • Just to add to this dormant thread, yesterday I installed a PCTEL GPS-TMG-40N antenna with low-loss feeder and it certainly does the trick. I went for the 40 dB version so there's plenty of signal in hand to feed a 4-way passive splitter when I get …
  • v1.214 seems to solve the problem. Thank you very much for the quick fix.