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wishboneash last won the day on August 24 2013

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About wishboneash

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  • Birthday August 29

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    :KLVK, CA
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    '78 M20J

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  1. Does anyone know lateral requirements to "hit" a fly-over GPS waypoint? Is it 0.3 miles? Will GPS receiver sequence to next waypoint if one is not on target? Typically found on missed approaches. Thanks.
  2. I will run a few more experiments to try to narrow this down by carefully recording the whole sequence from power up until the GPS locks.
  3. Sure, it's possible to couple through the antenna and then it would come to harmonics of one transmitter landing right on the pass band of the other receiver. No, I haven't tried the Faraday cage thing yet. I would have to ground the foil as well while keeping the display still visible! It's an intermittent problem as well, so at the moment I am still trying to figure out when it happens. Thanks.
  4. Anthony, I would expect new COM radios to be designed well enough to not leak RF since their main function is dealing with very low level RF signals and their on-board synthesizers are properly shielded. Also would expect their transmit sections be very carefully shielded and isolated from the receiver. Of course it's possible a malfunction (bad decoupling capacitors in the power supplies, other mechanical or electrical failures, broken solder joints etc.) could cause problems on older sets causing EMI. Did you figure out why your radios did this or was it just old avionics not playing well with the GPS receivers (which also deal with extremely low level signals buried in noise)? I wouldn't expect the same rigor say in the design of say engine monitors, attitude indicators etc which are really not dealing with RF frequencies or signal levels but do have a lot of digital circuitry and clocks that could radiate harmonics especially if the designer weren't pay attention.
  5. No difference with ext/int power or ext/int antenna. Also tested at home without other interfering sources. It's pretty cut and dry that the D3 is generating this interference. It could be a digital clock (typically harmonics that might be fall into the aviation band) that is left unshielded. If two new units displayed the same behavior it has to be a board design issue.
  6. Yes. Clean as a whistle once the D3 is off. I wouldn't expect certified COM radios to radiate their local osc. to interfere with others . They are usually very well shielded. I tested the D3 at home with an SDR receiver as well as a handheld radio. The D3 interference breaks squelch on the portable at a distance of about 4 to 5 ft on 121.6 MHz.
  7. Will work with Dynon, being under warranty. Taking this to PM until it's resolved.
  8. Happens on both internal power and external power. Makes no difference with external antenna as well. I have a feeling it has to do with the display driver since tone is modulated by what's going on on the screen. Sent from my LM-V405 using Tapatalk
  9. Hi I would like to reach out to the group and ask anyone who has a Dynon D3 portable attitude indicator to run a small experiment for me. I see interference on my COM radio whenever the D3 is turned on. Happens on a specific frequency, namely 121.6MHz which is of course a common ground frequency at many airports. It basically opens up the squelch and in some cases makes communication on 121.6MHz impossible. There is a fairly loud tone present which varies as the display changes on the D3 as it boots up through the menus. If anyone can test this, please get back to me with your results. I reported this to Dynon, they sent me a new replacement unit which has the same issue. I also used an SDR radio to scan the band and can see interference. I am sure there are other frequencies but I haven't come across them yet while in the plane. Also, checked it out on a portable ICOM radio. Same thing. Need to think of next steps. Thanks.
  10. Without "payload" it skews the results a lot. I thought payload was among top consideration for most aircraft buyers! However, can't complain about the final result!
  11. Congratulations Anthony, may you hit 50 thou soon! Never met you, but thanks for your wonderful summaries and calming presence on MS which is highly uncommon these days. Sent from my LM-V405 using Tapatalk
  12. Almost looks like a display driver hardware or software issue to me. Sent from my LM-V405 using Tapatalk
  13. 300 rpm? That's excessive by any measure. I haven't had much time yet with the new mag and hope to quantify things a little more as I get longer flights under my belt. Sent from my LM-V405 using Tapatalk
  14. I had a Surefly mag installed on my 201 yesterday. Replaced right mag with a SIM4N. Left is an impulse coupled mag which just got overhauled at a little over 500hrs. All spark plugs are Tempest massives. Only have started it a couple of times so far, but it starts quickly and easily within a few revolutions. RPM drop is around 50 on the Surefly and the temp rise is much slower when switching to single mag at altitude. LOP operations appear to be much smoother (FF difference is around 0.1 gph) but now I can do deeper into LOP without stumbling. I have not run it above 5,500 ft so I can't comment on higher altitude performance. There appears to be no increased power/speed performance but engine is decidedly smoother overall. No shutdown issues but a very slight hiccup when switching to the R mag.
  15. I have had the GTN650 hanging and not transferring when using the FS510 to update (using wifi). I have had to restart the GTN650 and its been a crapshoot many times. Never had a problem using the SD card, but I am not always prepared with an updated SD card. So it can be frustrating.