[Elecraft] [KX3] New Product: SPX3 External Speaker

[Don Wilhelm]

Keith,

You can already do that with a simple stereo cable to connect the 
KX2/KX3 PHONES jack to your computer soundcard input.

The computer soundcard level can be changed without varying the KX2/KX3 
AF gain.

73,
Don W3FPR

On 4/14/2018 9:47 PM, Keith Onishi wrote:
> I would prefer followings;
> 
> 1. a stereo audio output which can be connected to PC audio input.
> 2. a VR for changing SP output level without changing KX3/KX2 AF VOL
> 
> These are useful to operate digital modes.
> 
> 73 de JH3SIF, Keith
>   
>> 2018/04/13 2:06、Robert J. Morris <ag6zz at iloc.com>のメール:
>>
>> I've built a prototype powered external speaker for the KX3, and would
>> like some feedback on what folks would desire in terms of features, and
>> whether folks would want to own one.
>>
>> The speaker currently is designed to match the overall look of the KX3
>> and PX3, and accept similar third-party panels and covers as for the KX
>> line. Presently, it uses the same legs and feet as the KX3 and PX3, and
>> is the same height and depth as those. There is one USB port for
>> charging the internal lithium battery, and input and output stereo
>> jacks. The speaker is mono. The output jack redirects the right channel
>> from the stereo input for a second speaker, just like with the Elecraft
>> SP3 and other similar external speakers. The speaker is amplified.
>>
>> The SPX3 puts out a maximum of 3W, and is about as loud as any external
>> radio speaker gets. Volume is adjusted by the KX3. It plugs into the KX3
>> PHONES jack. There is a built-in low pass filter to reduce noise and
>> improve the listening experience.
>>
>> The prototype, as you'll see in pictures in the links below, is slightly
>> narrower than the expected finished product. The speaker driver and
>> on/off switch are both waterproof, but - just like the KX3 and PX3 - the
>> case isn't. So, don't drop it in a lake. It will handle all conditions
>> appropriate for the KX3, and is meant for indoor and outdoor use. Having
>> matched the case design so closely to the KX3, it isn't as airtight as
>> I'd like it, so the next prototype will have the case halves join in a
>> more customary way, but remain the same dimensions and overall look.
>> This will also improve ingress protection.
>>
>> You'll see the speaker is not a polished finished product yet, as it's a
>> rough first prototype made by hand. Your feedback will assure the final
>> product is what you want gracing your portable shack.
>>
>> Please note, the KX3 in the photo is only to demonstrate the speaker.
>>
>> All feedback is welcome. Please let me know which reasonable
>> enhancements or simplifications you'd like to see.
>> Examples:
>> * Would you want an output USB port to use the speaker to charge your
>> phone?
>> * Would you want to dispense with the built-in battery, and run it
>> entirely from external power?
>> * Would you want a second passive speaker driven by the first to save on
>> weight and cost? That is, a SPX3A (active, with battery, charger, and
>> amp) and SPX3P (passive, with only speaker driver)
>> * If you're a KX2 user, would you like me to produce the SPX2 (also in
>> development)?
>>
>> Pictures:
>> SPX3 with KX3: http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_KX3.JPG
>> SPX3 Left Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_LeftOblique.JPG
>> SPX3 Right Oblique:
>> http://www.iloc.com/ag6zz/SPX3/AG6ZZ_SPX3_RightOblique.JPG
>>
>> 73,
>> Robert (AG6ZZ)
>>
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Trademarks (TM) of Robert
>> J. Morris
>> SPX2, SPX2A, SPX2P, SPX3, SPX3A, and SPX3P are Copyright (C) 2018 by
>> Robert J. Morris
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> 
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