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Type: Posts; User: brandon lind

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  1. That radio comes locked to the ham bands as FCC...

    That radio comes locked to the ham bands as FCC type acceptance does not allow that radio to be sold for or used with GMRS frequencies. You would need to look into a mars/cap modification which...
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    SMA Female to UHF (PL-259) Male ...

    SMA Female to UHF (PL-259) Male

    https://www.amazon.com/DHT-Electronics-coaxial-adapter-female/dp/B00CVQRJG4/ref=sr_1_7?keywords=sma+female+uhf+male&qid=1566483539&s=gateway&sr=8-7
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    As soon as you add a second antenna (assuming it...

    As soon as you add a second antenna (assuming it looks nothing like a CB antenna), people automatically assume ham.

    There is the possibility of using the same antenna, but there are serious...
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    Update: The multiple avalanche transistor idea...

    Update:
    The multiple avalanche transistor idea failed. Adding the extra circuits added length to the traces and slowed the rise time too much. Slower rise time, fewer harmonics. I have not got...
  5. I found this picture on google. It looks like 10...

    I found this picture on google. It looks like 10 turns.

    Length, diameter and number of turns all play a role in determining a coils inductance. A coil is used to introduce inductive reactance to...
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    Just wanted to share this

    I never cease to be amazed when I watch videos from the old days before technology made things easy for the every day person. I've seen videos for changing a crystals frequency by sanding them or...
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    I will ba taking precautions to prevent that. I...

    I will ba taking precautions to prevent that. I live about 2 miles from the nearest full-time resident and plan to enclose this in a metal case.
    Being my picoscope only does fft spectrum analysis...
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    I will try that this weekend. I have a few neon...

    I will try that this weekend. I have a few neon bulbs laying around somewhere. I do need to feed this signal into my spectrum analyzer though so I will need to use a low value resistor between the...
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    HF-VHF Noise Sources

    Having no tracking generator on my spectrum analyzer, I wanted to make a broadband noise source for doing filters and such. After trying a few of the 2N3904/Zener or LED schematics online (the parts...
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    There was only one in the vicinity but I doubt it...

    There was only one in the vicinity but I doubt it would be the cause as the oscillator works fine switched to the other coils. I might have to look into the switching diode that selects LSB. I wish...
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    Bearcat 980 alignment

    While putting a Bearcat 980 (the newer one with less tuning coils inside) back on frequency I ran into trouble. Being my probe loads the oscillators too much to measure frequency (and there is only...
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    You do not want to make the capacitive coupling...

    You do not want to make the capacitive coupling to the inside of the hull. My first reaction to this idea was that the skin effect (which keeps signals in a coax from going through the braid to the...
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    Handheld Radios Why not just bring it in the hardware store and...

    Why not just bring it in the hardware store and try different machine screws in the fastener isle?
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    Connecting to the carbon fiber could be easily...

    Connecting to the carbon fiber could be easily done through capacitive coupling if the electrodes are large enough. At 915MHz, I don't think it would take much of a metal patch. Antenna manufacturers...
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    Even using lora, you are not getting 500 miles...

    Even using lora, you are not getting 500 miles out of a 10w VHF transmitter reliably. For VHF to work that far (without legal limit power and a prohibitively expensive antenna array and feed line)...
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    Base Radios it is unlikely you would hear the signal trying...

    it is unlikely you would hear the signal trying to drive the final. I have had a few instances where I know for sure it didnt make it out of the radio..

    Just start out seeing if the diode...
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    Base Radios Not sure what you mean. Are you trying to drive...

    Not sure what you mean. Are you trying to drive the final inside the ft900 with an external source? If everything else on the radio still works, just no PO, I would start by testing the voltages...
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    Base Radios Does the TX/RX relay click when you hit PTT? Have...

    Does the TX/RX relay click when you hit PTT? Have you tested the finals?
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    I think you are right, it would make sense that...

    I think you are right, it would make sense that it would still function as a balun. I never thought of it that way.
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    The bazooka balun theory... If the sleeve is...

    The bazooka balun theory... If the sleeve is connected to the shield at the end of the coax, it is acting like one side of a dipole that simply has its coax ran through the sleeve to keep it out of...
  21. Don't spend it all on a rig and antenna alone....

    Don't spend it all on a rig and antenna alone. Had I bought an antenna impedance analyzer right away, the time I would have saved....

    Power supply, coax, tuner, swr/power meter with dummy load,...
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    It is illegal to use voice encryption (at least...

    It is illegal to use voice encryption (at least in the ham bands). The APX P25 Motorola radios police use are capable of encryption but they run $1k to $5k each. What radio service do you intend to...
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    My UV-5R V2+ consumes about 90mA during scan...

    My UV-5R V2+ consumes about 90mA during scan according to my bench supply. My battery is rated at 1800mAh, which means the radio should be able to run for about 1800mAh/90mA=20 hours. That number...
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    What he is referencing is a dipole that uses a...

    What he is referencing is a dipole that uses a hollow sleeve as one half of the driven element that has been modified in a collinear manner using phasing elements allowing the high impedance at the...
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    No problem! Just remember, the VFO changes the RX...

    No problem! Just remember, the VFO changes the RX and TX, whereas RIT only changes RX.

    Let us know how it works!
    73!
    KE0KOY, Brandon
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