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Thread: Intro to Radio Communications

  1. #481
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    #1. good rundown. appreciate that.

    #2. I had a coworker (now deceased) that was a big ham guy. at one point he mentioned doing a "moon bounce" for long range. he said if you could both see moon you could talk. he never did sat what frequency band though. know anything about that?

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  2. #482
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    Quote Originally Posted by nova3930 View Post
    #2. I had a coworker (now deceased) that was a big ham guy. at one point he mentioned doing a "moon bounce" for long range. he said if you could both see moon you could talk. he never did sat what frequency band though. know anything about that?
    It's called EME (Earth-Moon-Earth) or Moonbounce. Generally on 2-meters nowadays. You'll need a high-gain antenna and sensitive receiver.

    Here's a quick primer: http://www.w5un.net/primer.htm

  3. #483
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    Quote Originally Posted by danco View Post
    It's called EME (Earth-Moon-Earth) or Moonbounce. Generally on 2-meters nowadays. You'll need a high-gain antenna and sensitive receiver.

    Here's a quick primer: http://www.w5un.net/primer.htm
    This^

    Better bring some horsepower, too!

    Speaking of Extraterrestrial Communications:


  4. #484
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    cool good info guys

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  5. #485
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    Outlander, good read, but what is your call sign?

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  6. #486
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    Great post. A few more weeks when I move away from hurricane central, I'm going to start getting serious back into Hams.
    U.S. Army vet. -- Retired 25 year LEO.

  7. #487
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    @Det-Sog, good luck with the move.

    @docsherm, OP updated with example equipment.

  8. #488
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    I'm curious to get you guys' take on this. I've been looking to get into radio, and have been weighing options between Yaesu 817ND and some handheld units (FT-60r or even the TRI PRC 148 clone). I spotted this on Brushbeater, and it looks interesting for a lot of uses.

    CommRadio CTX-10



    The CommRadio CTX-10 blends high performance, internal SDR technology, high efficiency circuit design, compact size and simple operation. This multi-mission QRP radio is ideal for field use and emergency operations. Transmitter covers 160-10 meter amateur bands with output power adjustable from 1 to 10 watts. The new design uses ruggedized land mobile power amps in push-pull. Every aspect of the radio design is optimized for low power consumption.

    The efficient and sharp OLED display is readable in low or high lighting conditions. The radio has three built-in #18650 3.7V 2600 mAh Li-ion batteries providing 28.8 watt-hours of operation. A built-in intelligent charger provides seamless power management.

    The general coverage receiver section uses multiple preselectors for optimized reception from 200 kHz to 30 MHz. An integrated CW reader and antenna tuner enhances portability. The premium tuning knob optical encoder is rated at a million revolutions.

    Entire enclosure is aluminum with metal knobs and front panel. External connections are through-hole mounted for durability. Includes USB cable, DC power cord and manual. DC power requirements: receive 1.5 W, transmit 20 W. This quality device is robustly built in Colorado, U.S.A.

    CTX-10 Specifications

    Transmit Bands: 160-10 meters CW/SSB
    RF Power Output: 1 to 10 Watts
    Receive Coverage: 200 kHz – 30 MHz
    Receive Modes: USB/LSB/CW/AM/FM
    Receive Bandwidths: AM 5/7.5/15 kHz
    SSB 1.8/2.2/2.6 kHz
    CW 0.5/1/1.8/2.2/2.6 kHz
    NBFM 15/25 kHz
    Receive Auto Bandwidths:AM 5/7.5/15 kHz
    SSB 1.8/2.6 kHz
    CW 1/0.5 kHz
    Tuning Resolution: 1MHz, 100, 10, 1 kHz, 100, 10 Hz.
    HF Sensitivity MDS: -130 dBm (500 Hz BW)
    Audio System: 8 Ohm 0.8 watts to
    1.2×1.6″ Internal Speaker
    or External Speaker jack
    AGC Attack Time: Slow/Medium/Fast
    Antenna Input: BNC 50 Ohm
    Display Types: OLED 64×128
    DC Power Jack: 10-20 VDC 2.5 x 5mm
    DC Power: 2.0 Amps @12VDC
    Batteries: 3 #18650 Li-ion 2.6 Ah
    USB Mini-B 2.0 Jack: Charges battery while
    operating radio.
    I-Q data & radio control
    Windows spectrum scope
    ESD Protection: ESD diodes at antenna, power jacks,
    USB port, keys and knobs.
    Physical: 5.7 x 1.6 x 6.7″ 2.2 lbs.
    "Man is still the first weapon of war" - Field Marshal Montgomery

    The Everyday Marksman

  9. #489
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    The CTX-10 looks interesting, but the 817ND is a solid piece of gear that would be a great general purpose tool.

    I'd love to see a portable unit with 20-watts out, but that desire has fallen on deaf ears to the big three.

  10. #490
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    I was literally counting the seconds before Outlander would reply .
    THE MORE YOU SWEAT IN TRAINING, THE LESS YOU BLEED IN BATTLE

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