Portable external speaker for KX3?

Discussion in 'QRP Corner' started by KD8ZM, May 19, 2018.

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  1. KC3RN

    KC3RN Ham Member QRZ Page

    KD8ZM likes this.
  2. KD8ZM

    KD8ZM Ham Member QRZ Page

    KC8VWM, I received the Motorola unit tonight, and rigged it up as you directed. Works wonderfully on the KX3. I tried it on my Icom 7200 and it really doesn't work so well there, as the 100 watts swamps the circuitry every time I hit the CW key. Or at least, it makes a sound like it is being swamped. I think that must be because the Motorloa unit with its amplifier is a sort of radio itself, considering that when I touch the jack of the Motorola unit to my antenna (with no radios turned on or in the circuit, only the Motorola), I am able to pick up AM radio stations on the speaker, loudly enough to make out what they're saying. Haven't figured out where the tuning knob is on this thing yet, though :)
    The speaker is much, much larger and heavier than I'd imagined it being. Obviously not a backpacking speaker!
    But, for the KX3 this thing seems to work great - many thanks for the tip, OM.
    Brady KD8ZM
  3. KC8VWM

    KC8VWM Ham Member QRZ Page

    Great news. I knew it would sound good on the KX3. :)

    In terms of RF heard in the speaker amplifier, you might be too close to the antenna. I would try to install some ferrite chokes on the speaker cable as close to the speaker as practical. Also make sure you're using shielded audio cable going to the speaker too.

    I really like mine and it works fantastic with my FT-817 and i'm sure your KX3 sounds like a new radio.

    73 Charles - KC8VWM
    Last edited: Jun 6, 2018
  4. AG6ZZ

    AG6ZZ Ham Member QRZ Page

    Somehow, I missed this thread until now. I'm developing a new external speaker designed specifically for the Elecraft KX Line which matches the dimensions and appearance of the KX3. I posted about it in the Elecraft forums a few months back. Working with vendors takes more patience than you could imagine, but a factory-made prototype is imminent. The picture is of the first, hand-made prototype resting beside a KX3. It's hand-made; not machine made, so you'll have to excuse the rough appearance. A pair of these daisy-chained will take advantage of the stereo effects of the KX2/KX3 PHONES output. One (even two) can also be daisy-chained with a PC for audio monitoring of digital modes.

    A few key features are:
    * Stereo IN and OUT ports
    * Internal battery
    * 9-16 VDC in; just like KX3
    * Runs on external power or battery
    * External power charges battery
    * Built in amplifier
    * 5W max audio
    * SideKX panels will be available from the day it ships

    Last edited: Sep 15, 2018
    AJ6KZ, KC8VWM and KG7WGX like this.
  5. KQ4MM

    KQ4MM XML Subscriber QRZ Page

    Im going to give one of these a shot with my KX3 .. @KD8ZM you still liking/using yours? Just got one off eBay for $15
  6. AJ6KZ

    AJ6KZ Premium Subscriber QRZ Page

  7. KQ4MM

    KQ4MM XML Subscriber QRZ Page

    Got mine today and did a quick wireup/test ... Amazing on the KX3 .. side by side with my IC-7610 and its SP-41 I think this thing sounds better... Only issue I have is when in stand by there is a faint crackle , i mean very faint.. that and the lout pop you get when power is applied ...
  8. KQ4MM

    KQ4MM XML Subscriber QRZ Page

    Here is a link to a audio file, first part of snip is a IC-7610 with a external speaker SP-41 with AF gain set to 10oclock position.. then I swap over to the KX3 AF gain set to 15 on the Motorola speaker.. Recorded with a Olympus pocket recorder about 2 feet from both speakers... Audio File ...

    Very pleased with this setup, just what the KX3 needed when at home..
  9. K8JD

    K8JD Ham Member QRZ Page

    Look for used Motorola HSN8145A, they have amazing sound output for the size. 4.5" wide by 2 "
    deep and 2" tall. No betteries or power required.

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