Recent content by freddoair

  1. freddoair

    PCB ADS-B 1090MHz Antenna

    Mike, You've nailed it! Just one thing worth checking is that whatever paint you use, do a test paint first on a spare piece of your white tube to make sure the paint doesn't change the RF transparency of the tube. Repeat the microwave test on a painted test piece.
  2. freddoair

    ADS-B Filter

    I don't have to deal with your "headaches", just a single cell site 285m away, and I think the Minicircuits filter is mostly dealing with that. However, I have considered a second unit to go after the LNA as a belt and braces approach for the RF environment seen by the dongle.
  3. freddoair

    ADS-B Filter

    I'm familiar with 0dBFS in the digital world. Until yesterday I had a regular supply of local aircraft flying over and around near here to provide a wide variety of signal levels, but all those pilots - from an aviation college - graduated yesterday so they'll now head off home. I "think"...
  4. freddoair

    ADS-B Filter

    I started with Debian and apart from one fruitless attempt at Redhat a long time ago, I've stayed with Debian. I once downloaded 14 CD images over 256kb/s ADSL and that took 6-8 hours for each disk, but these days I always download a net install iso and then get only the packages I need. I...
  5. freddoair

    ADS-B Filter

    I started with NOS under DOS, then a two port packet switch that booted and ran Linux from a floppy. I started the BBS with FBB/BPQ under DOS and then Win95 before moving all radio gear to Linux in about 1996. I "think" I used the 2.0.x kernel back then, upgrading to 2.0.36 before moving to...
  6. freddoair

    ADS-B Filter

    It's unlikely that I'd be in anybody's log! I started running a BBS in 1996 and I've hardly touched a microphone since! The BBS grew to 1x70cm, 2x2m, 1x20m, 1x30m and 1x40m ports. I was on 25 acres so room for antennas was readily available. When Packet started to die I moved to an APRS Igate...
  7. freddoair

    ADS-B Filter

    We might know or know of each other, I'm VK2TV. Was previously VK2BVO and originally VK2ZSX. All you need now to work V/U DX is a dual-band radio and a hand-held yagi. There's quite a few LEOs running FM voice repeaters 2m up and 70cm down. I'm gating the APRS satellites.
  8. freddoair

    ADS-B Filter

    Placing an attenuator after the LNA might appear strange, until one realises that the purpose of the LNA is NOT to make signals stronger, it's to enable "lifting" weaker signals out of the noise created by the receiver's front-end. A LNA with variable gain would be quite useful, I agree. I did...
  9. freddoair

    ADS-B Filter

    Hey ab cd, some good advice. The Australian licencing authority - ACMA - has an online tool into which you load your Lat/Long, search distance from that location, and a frequency range. After a lot of number crunching it spits out a list of all transmitter and receiver licences that meet the...
  10. freddoair

    ADS-B Filter

    Thanks guys, Having worked in the two-way radio industry for 40 years, and being a licenced amateur operator for 50 years has provided me with plenty hands-on awareness of the need for adequate filtering for receivers (and transmitters, too, to keep them clean). Those, well-elevated, busy radio...
  11. freddoair

    ADS-B Filter

    A while back I read a question about a particular ADS-B filter that was on Ebay, so I took a look https://www.ebay.com/itm/132406298935?ul_noapp=true Given that the filter was from Mini Circuits, a long established and well respected US manufacturer of microwave components, and the price was...
  12. freddoair

    Incorrect Routes Shown

    To me it would be logical for all clients to use the same standard, whatever that may be. Some users might get their knockers in a knot to see "their" favourite scheme changed, but uniformity would ultimately benefit the majority. As for what started this thread, until NSW Ambulance register...
  13. freddoair

    Incorrect Routes Shown

    Further to what I said yesterday, today there are six aircraft performing military maneuvers within ADS-B range of here - currently flights are out to 300km (162Nm) off the coast. Five aircraft are leased civilian aircraft carrying civil registrations and as such they appear on PlaneFinder. The...
  14. freddoair

    Incorrect Routes Shown

    The NSW Ambulance Service provides the emergency medical evac needs of Lord Howe Island, 600km East of here, but since it's officially a part of NSW their planes are still (mostly) in Oz airspace! I hadn't thought about the military registering callsigns, even though I see their planes...
  15. freddoair

    Incorrect Routes Shown

    Thanks Lee. Using another organisation's IATA code sure is screwy. It's not as if we're dealing with a tin-pot organisation with one plane. The NSW Ambulance Service is a big government organisation that should know better!
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