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Amateur (Ham) Radio BS and Callsign Thread!

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

  1. Apr 6, 2020 at 6:10 AM
    #7101
    joshuajayg

    joshuajayg Well-Known Member

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    Well, that can control board looks complete. Not a bad idea if you want to control a fan with variable speed.

    I am running a couple 5v fans on my Pis with a mosfet as @DaveInDenver showed you can do. I also have a bunch or cheap 5v logic level, 10A relays with optocouplers for isolation laying around. I'd probably just run a fan with a mosfet and use a DS18B20 for temperature if you want that input. Or if you are mainly cooling the pi, check its CPU temperature to turn the fan on and off.
     
  2. Apr 6, 2020 at 6:18 AM
    #7102
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Unexceptional
    Would be pretty simple to PWM the fan to be proportional to the CPU speed.
     
  3. Apr 6, 2020 at 6:24 AM
    #7103
    joshuajayg

    joshuajayg Well-Known Member

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    Or rather, proportional to CPU temperature.
     
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  4. Apr 6, 2020 at 6:26 AM
    #7104
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Do what I meant, not what I typed. Yessir. Quarantine make brain mush.
     
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  5. Apr 6, 2020 at 12:40 PM
    #7105
    Atomic

    Atomic Master Cylinder

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    My Anytone 878 HT is having hard time reaching the closest repeater...I am looking at buying a dual band VHF/UHF J-pole external antenna to run from my HT's SMA connector. Do any of you have recommendations where to get one?

    Thanks.
     
  6. Apr 6, 2020 at 12:41 PM
    #7106
    m603holden

    m603holden @Koditten Pirate Radio member #063

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    https://www.jpole-antenna.com/
     
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  7. Apr 6, 2020 at 12:42 PM
    #7107
    vssman

    vssman Rocket Engineer

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    I have this one. The seller can be slow to ship but the J-pole does work well.

    https://www.ebay.com/itm/2-meter-70...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
     
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  8. Apr 6, 2020 at 1:41 PM
    #7108
    Atomic

    Atomic Master Cylinder

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    Thank you both!

    I am not sure how much anttenna gain I need but 2dB-3dB (including RF cable losses) would be great.
     
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  9. Apr 6, 2020 at 2:01 PM
    #7109
    foy1der

    foy1der Well-Known Member

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    A typical jpole is going to be about 5dbi of gain, unless you are going about 50 feet with crappy rg58, you should be right about those numbers. As always, buy the best feedline you can afford.
     
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  10. Apr 6, 2020 at 4:57 PM
    #7110
    Atomic

    Atomic Master Cylinder

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    Gonna go with 10ft of LMR-400.
     
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  11. Apr 6, 2020 at 7:30 PM
    #7111
    DaveInDenver

    DaveInDenver Not Actually in Denver

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    Unexceptional
    Amphenol actually makes an SMA connector for LMR400/RG8, part number 132333. The Anytone probably uses the reverse SMA so I assume you're thinking adapter but seeing the big ol' fat LMR400 going into an SMA is almost comical. In real use I wouldn't recommend anyone do this for an HT, it's likely to break the connector. A 6" LMR100/RG174 pigtail with an SMA to whatever is more kinder to the radio.

    lmr400_cable_1_5mt_n_m_-sma_m__1.jpg.jpg
     
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  12. Apr 6, 2020 at 8:10 PM
    #7112
    m603holden

    m603holden @Koditten Pirate Radio member #063

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    That's awesome.
     
  13. Apr 8, 2020 at 5:46 PM
    #7113
    mightym

    mightym Well-Known Member

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    Just passed my tech exam doing a online session with 5 other VE's watching me, lol :bananadance:

    This link for those who want to sign-up for an exam:

    https://hamstudy.org/sessions

    Make sure to have an FCC Registration Number (FRN) before setting a date to avoid delays
     
    Last edited: Apr 8, 2020
    Chipskip, NotRed, k8md and 3 others like this.
  14. Apr 8, 2020 at 9:15 PM
    #7114
    m603holden

    m603holden @Koditten Pirate Radio member #063

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    Congratulations!
     
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  15. Apr 9, 2020 at 10:51 PM
    #7115
    bs63366

    bs63366 Well-Known Member

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    ARE Z-series shell, ImMrYo mirror lift, always on fog-lights.
    When wiring for a HAM radio in a truck, would it work to wire it off of a Bussman RTMR or would that not properly separate it from the noise of the other devices?
     
  16. Apr 10, 2020 at 4:09 AM
    #7116
    foy1der

    foy1der Well-Known Member

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    Best practice is to run directly from the battery.
     
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  17. Apr 10, 2020 at 4:22 AM
    #7117
    btreible90

    btreible90 Well-Known Member

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    Hey everyone! So I was planning on taking my HAM test right as everything shut down so needless to say my class was cancelled. I keep hearing rumors and stuff of online testing being a possibility. Was curious of any of you have hear anything about that?
     
  18. Apr 10, 2020 at 7:01 AM
    #7118
    Old Marine Cal

    Old Marine Cal Well-Known Member

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    From what I can find thus far, it has been completed successfully once.

    Might be coming in the future.

    I started working towards my general the 1st of the yearish. First test date in my area, May 3rd. Doubt it will happen so I am definitely interested in this option.
     
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  19. Apr 10, 2020 at 7:22 AM
    #7119
    medic2230

    medic2230 @Koditten Pirate Radio member #002

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    Little overkill for a ht isn’t it?

    10’ of RG8x and a PL-259 To sma adapter should be fine. The adapter will take the strain off of your ht connection.


    1B4CCD87-2CD7-4C82-AD96-04383D196C21.jpg
     
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  20. Apr 10, 2020 at 7:38 AM
    #7120
    maineah

    maineah Well-Known Member

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    That's about 500% overkill.
     
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