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Amateur (Ham) Radio BS and Callsign Thread!

Discussion in 'Sports, Hobbies & Interests' started by The Traveler, Jan 29, 2013.

  1. Aug 25, 2020 at 6:19 AM
    #7901
    golfindia

    golfindia Well-Known Member

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    Many receivers don't perform very well in those out of band zones. It's probably a harmonic of something.
     
  2. Aug 25, 2020 at 6:32 AM
    #7902
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    I was wondering if it was but hadn't heard it anywhere else I scrolled through. How close to 117mhz would it have to be to hear it like that? FM radio stopping at 108mhz wouldn't be too far of a stretch I guess.
     
  3. Aug 25, 2020 at 8:21 AM
    #7903
    joshuajayg

    joshuajayg Well-Known Member

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    I don't know the theory and math behind figuring that out. But also, broadcast FM is just that, FM. You were demodulating AM. Someone else will have to answer that.
     
  4. Aug 25, 2020 at 8:26 AM
    #7904
    0xDEADBEEF

    0xDEADBEEF Where are we going? Why am I in this handbasket?

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    harmonics-1024x496.jpg


    Harmonics are multiples of a frequency, more or less. If thats whats going on here, I'd expect the source to be something lower. You can play with this calculator to see where it might have started:
    http://mustcalculate.com/electronics/harmonics.php

    58.5 MHz, 39 MHz, etc.
     
    Sandman614 and joshuajayg like this.
  5. Aug 25, 2020 at 1:57 PM
    #7905
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    That's awesome, I'll have to sit down and look at it later. Continuing to be curious I was still picking it up this morning and heard hurricane center updates. It's definitely some FM radio type station. I could even still hear it, but less so, while I drove to the store.
     
  6. Aug 25, 2020 at 1:58 PM
    #7906
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Kheiron likes this.
  7. Aug 25, 2020 at 2:00 PM
    #7907
    0xDEADBEEF

    0xDEADBEEF Where are we going? Why am I in this handbasket?

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    Yeah it would be weird to pick up FM on an AM radio...But...

    As a kid I build one an aircraft radio receiver kit. There wasn't much to it, and the instructions were clear. All I could ever to get it to pick up was FM broadcast radio. If only I had kept it, I have more of a clue now, and a scope. :laughing:
     
  8. Aug 25, 2020 at 2:38 PM
    #7908
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    I guess there is AM radio still too.
     
  9. Aug 25, 2020 at 5:19 PM
    #7909
    wink4x4

    wink4x4 Well-Known Member

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    So I was finally able to do some testing, turns out it is my MESO brake lights. Unplug the lights and no interference. Would using chokes still help with this?
     
  10. Aug 25, 2020 at 5:23 PM
    #7910
    m603holden

    m603holden @Koditten Pirate Radio member #063

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    Definitely a maybe
     
    foy1der, 0xDEADBEEF and Kheiron like this.
  11. Aug 25, 2020 at 5:42 PM
    #7911
    0xDEADBEEF

    0xDEADBEEF Where are we going? Why am I in this handbasket?

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    I wonder how hard it would be to rebuild them with passives...
     
  12. Aug 25, 2020 at 6:19 PM
    #7912
    golfindia

    golfindia Well-Known Member

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    Unlikely. My LED interference came right through the front end of the receiver.
     
  13. Aug 25, 2020 at 8:55 PM
    #7913
    joshuajayg

    joshuajayg Well-Known Member

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    I checked earlier today. US AM broadcast radio is is around 1khz. That makes 117.7mhz the 80th harmonic. Not gonna happen.
     
  14. Aug 26, 2020 at 12:59 PM
    #7914
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    Progress, well sort of.. To start with a boring YouTube video that I found for setting up a Bluetooth SPP device to work with aprsdroid and backcountry navigator. I'm thinking either aprsdroid does not support BLE devices or I have my setting wrong. A random 'serial Bluetooth terminal' app reads the serial output just fine.

    https://youtu.be/TerxrVD2FEg

    Screenshot_20200826-153942.jpg
    Screenshot_20200826-154154.jpg

    https://github.com/ge0rg/aprsdroid/issues/124
     
    Last edited: Aug 26, 2020
  15. Aug 26, 2020 at 4:29 PM
    #7915
    joshuajayg

    joshuajayg Well-Known Member

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    I thought I had an idea but it's likely irrelevant. If I configure my TNC with the mobilinkd app then forget to disconnect from that app, I will get the same error you got. The github issue might be a better lead though.
     
  16. Aug 26, 2020 at 4:42 PM
    #7916
    0xDEADBEEF

    0xDEADBEEF Where are we going? Why am I in this handbasket?

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    If my 5 minutes of phone research is anything to go by, I'd say your radio isn't in KISS mode or it isn't sending the right tnc init string.
     
  17. Aug 26, 2020 at 5:32 PM
    #7917
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    The video calls for Kenwood nmea9. There's no KISS mode in the radio, I was just trying the other protocols at random to see if anything would connect. Then I disconnected the radio fully and still can't connect to BLE from aprsdroid . Since the terminal app with BLE support can connect and read data, I assume that aprsdroid just doest support BLE or maybe more accurately the module doesn't support the Bluetooth SPP profile the app is looking for. I've got another module coming that does support Bluetooth SPP.
     
    0xDEADBEEF likes this.
  18. Aug 26, 2020 at 5:39 PM
    #7918
    m603holden

    m603holden @Koditten Pirate Radio member #063

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    This BLE?

    https://developer.android.com/guide/topics/connectivity/bluetooth-le
     
  19. Aug 26, 2020 at 5:54 PM
    #7919
    Sandman614

    Sandman614 Snarky TWSS elf, Travis #hotsavannahdotcom, LRGRNR

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    m603holden likes this.
  20. Aug 26, 2020 at 5:59 PM
    #7920
    m603holden

    m603holden @Koditten Pirate Radio member #063

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