Hi John, Thanks for your feedback. It appears I didn't point out that the speaker can be powered externally, with or without an internal battery. I'm also going to change the power requirement to the standard ham shack 12V/13.8V. Actually, it will accept the same voltage range as the KX3 (9-15V DC).
73, Robert (AG6ZZ) On 2018-04-13 11:32, John Gibson wrote: > Hi Robert, > > Your proposed speaker looks interesting. Thank you for offering it. > > My need is a little different. I want to use a KX2 for portable emergency > communication, powering it directly from a 12V lithium iron phosphate (LFP) > battery. For this application I would like to power an external amplified > speaker directly from the same 12V LFP battery. I would be rather not have to > recharge an amplified speaker's internal battery. > > 73, > John, no8v > > ________________________________________ > From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> on > behalf of Robert J. Morris <ag...@iloc.com> > Sent: Thursday, April 12, 2018 1:06:25 PM > To: firstname.lastname@example.org > Subject: [Elecraft] [KX3] New Product: SPX3 External Speaker > > 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 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to gib...@alma.edu ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com