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Amateur (Ham) Radio BS and Callsign Thread!

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

  1. Mar 19, 2019 at 3:09 PM
    #4881
    Gunshot-6A

    Gunshot-6A West Coast Randy

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    Utah is pretty flat, so for most purposes a 5/8 is better for my purposes. Especially when the APRS digipeaters are across the valley from me. But we do have some nice mountain ranges that could benefit from a 1/4 wave.

    Is there a good resource for measuring antenna interference distances as well? Trying to run multiple antennas simultaneously on the roof seems like a hazard for overload. Im thinking of a 5/8 wave on the front corners of the roof rack so ~47 inches apart. Primarily run on 144.390 for aprs and 146.460/520/620Mhz for voice
     
  2. Mar 19, 2019 at 3:15 PM
    #4882
    Bastek

    Bastek Member

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    Thanks for this great explanation!

    My previous suggestion was based assumption of Nagoya antenna being a replacement for rubber ducky, not external 1/4 wave antenna...
     
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  3. Mar 19, 2019 at 3:16 PM
    #4883
    Gunshot-6A

    Gunshot-6A West Coast Randy

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    Well you are right, it is a ducky. But i usually put my radio up on my roofrack when parked and beacon external. In cab would be total garbage.
     
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  4. Mar 19, 2019 at 3:26 PM
    #4884
    Bastek

    Bastek Member

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    I might need a suggestion for an external speaker. Right now I'm using a Midland 4ohm speaker Midland 21-406 Deluxe CB / Amateur / Marine Extension Speaker https://www.amazon.com/dp/B000246VPM/ref=cm_sw_r_cp_apa_i_.QwKCbFWDH0WS mounted in driver's footwell. Works well while stopped or in traffic, but turned out pretty useless while driving at high speeds. Might need amplified speaker.
    I have Yaesu ftm-400 which calls for 4ohm speaker. Now, I've seen some amplified speakers, but they had 8 ohm impendence. So. Should I worry about it since they're amplified?
     
  5. Mar 19, 2019 at 3:32 PM
    #4885
    tex.proud

    tex.proud Jesus Christ It's Midnight!

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    I took the face off of this MFJ speaker and mounted it to the headliner near the upper console. Right near my head, can hear it regardless of wind and road noise.
     
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  6. Mar 19, 2019 at 3:32 PM
    #4886
    foy1der

    foy1der Well-Known Member

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    If you are outside, I would give the Nagoya a shot, it might work and it's a whole lot cheaper. Plus it requires no wiring.
     
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  7. Mar 19, 2019 at 3:33 PM
    #4887
    foy1der

    foy1der Well-Known Member

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    I did the same but I kludged it together with a speaker I found on digikey. No issues at all.
     
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  8. Mar 19, 2019 at 3:42 PM
    #4888
    Gunshot-6A

    Gunshot-6A West Coast Randy

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    I have. It works decent if it has relative line of sight and not in a building or a car.
     
  9. Mar 19, 2019 at 5:33 PM
    #4889
    Bastek

    Bastek Member

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    Do you guys have any pics of your concoctions?
     
  10. Mar 19, 2019 at 5:41 PM
    #4890
    nats

    nats Well-Known Member

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    The FTM-400s (both the early one and the XDR) do behave much better with 4-ohm speakers but will drive an efficient 8-ohm speaker tolerably well -- Remember though, the 400's, like the 100's, use a ground-isolated stereo output, which is why Yaesu includes a ground isolated stereo to mono adapter with the radio. So, whatever speaker you choose, do use the provided adapter, or address both the plug in the radio and the stereo to mono conversion so that you'll get best possible power to the speaker and not damage the 400 with a mono plug.
     
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  11. Mar 19, 2019 at 5:43 PM
    #4891
    tex.proud

    tex.proud Jesus Christ It's Midnight!

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    Head unit on a Lido mount. Radio under passenger seat makes it easy to run a wire up the column. Simple took the front half of the speaker, cut a small hole for the magnet to fit through the headliner, and poke the screws through from the top.

    20181216_150723.jpg

    The other piece there is the CB
    20181216_131450.jpg
     
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  12. Mar 19, 2019 at 5:59 PM
    #4892
    Bastek

    Bastek Member

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    Thanks bud. Come to think of it, I might have seen your setup before ;).
    I will have to think of some alternate way, I don't have a all that real estate up top to even attempt cutting speaker holes in headliner :eek:.... Sunroof issues, lol.
     
  13. Mar 19, 2019 at 6:03 PM
    #4893
    Bastek

    Bastek Member

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    Thanks. Yup, I'm using their adapter with my external speaker. I kinda figured that I'd somehow drive 8 Ohm speaker, I was just hoping that it wouldn't make much difference 4 or 8 ohm if the speaker would be amplified. The transceiver would power the amplifier instead of speaker itself. Or am I wrong?
     
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  14. Mar 19, 2019 at 6:40 PM
    #4894
    MonkeyProof

    MonkeyProof Power Top

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    20190319_183917.jpg
     
  15. Mar 19, 2019 at 6:41 PM
    #4895
    MonkeyProof

    MonkeyProof Power Top

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    Any suggestions on how to fix this?
    20190319_183630.jpg
     
  16. Mar 19, 2019 at 6:41 PM
    #4896
    nats

    nats Well-Known Member

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    Yeah, the actual amp is all that the radio would drive, and not many of those would present that low of an impedance (4Ω or 8Ω) to the radio's output. (Think about it, if the input stage of the amp was something like 4Ω, that input stage would need to be able to dissipate the power output by the radio. By having an much higher input impedance on the amp, these cheap amps won't have to deal with components or housings to handle that kinda heat).

    You're spot on: Radio drives Amp input, and the Amp has to deal with whatever speaker load...
     
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  17. Mar 19, 2019 at 6:44 PM
    #4897
    pop.tremuloides

    pop.tremuloides Well-Known Member

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    KE0UIV

    Colorado guy!

    Keeping true to the OP thread.
     
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  18. Mar 19, 2019 at 6:52 PM
    #4898
    Gunshot-6A

    Gunshot-6A West Coast Randy

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    Part out
     
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  19. Mar 19, 2019 at 6:56 PM
    #4899
    Old Marine Cal

    Old Marine Cal Well-Known Member

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    The ENTIRE truck
     
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  20. Mar 19, 2019 at 6:57 PM
    #4900
    MonkeyProof

    MonkeyProof Power Top

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    You guys are brutal
     

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