"lousy audio" ?
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So, how about someone comming up with a good communications quality
amplified speaker and enclosure design, RFI proof of course! I would build one...I believe there was/is an Elecraft design but it looked overly complex... Anyone care to suggest a suitable audio chip, speaker and enclosure? -- 73, Deni F5VJC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Deni,
Actually it has already been done. Tom Hammond has a design with minimum components on his website that uses a TDA2003 audio chip. Look in the General Amateur Radio files section at www.n0ss.net. That is the one I am using. Plenty of audio. I am driving it into two paralleled 5 inch woofer 9 ohm speakers and it works great and I switch in a 'tweeter' which consists of the same speaker used in the K2 (Jameco 99996) when I want more high frequency response for SWL Broadcast listening - my 'tweeter' is connected with a series 40 uF non-polarized capacitor. My woofers were a special buy that I made many years ago and are not readily available, so my speaker setup is not readily reproducible. My prior amplifier used only one of the 9 ohm speakers and also worked fine. More power is available with lower impedance speakers (or in my case a paralleled pair). The frequency response will depend on your speaker choices and the enclosure - a bit of experimenting may be in order to obtain what you want to hear. A metal enclosure and ferrite beads on the inputs can produce the RF Proofing, but I use a wood cabinet with the speakers to control resonance effects. The electronics can be inside a shielded box if you encounter RF problems. Maybe someone will come up with details of an enclosure design using available speakers. 73, Don W3FPR F5vjc wrote: > So, how about someone comming up with a good communications quality > amplified speaker and enclosure design, RFI proof of course! > > I would build one...I believe there was/is an Elecraft design but it > looked overly complex... > > Anyone care to suggest a suitable audio chip, speaker and enclosure? > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Deni F5VJC
I think it would be a lot easier (but not as much fun) to
buy a good bookshelf speaker and small hifi amp. I got a set of little hifi speakers from a place that sold used hifi gear cheap, hooked them up to an old hifi amplifier, and into the computer sound card for games. I used to play flying games a long time ago.... The sound was fantastic, not like what computer speakers typically do, but 50 real watts per channel and GOOD speakers. When you crashed or ran into something, you FELT it. You could build an outboard amp, or on some speakers include it inside the speaker cabinet, but the people who make GOOD speakers spend a lot of time getting the response in the ballpark, so its somewhat flat and not real bumpy... There are a lot of chips that give very good audio with very few parts, one was an lm383 or something like that, 3 or 4 extra parts and a TO220 package with 5 or 7 leads, 12 watts out I think, there were a few models of various power outputs. I put one in an old Gonset G76 to improve the audio on a very good receiver (262 KHz IF). The entire audio amp was 1 inch square. Not much point of doing this on the K2 other than maybe more volume, but the K3 I hope has good fidelity out the line out jack (sound card). You can always reduce the fidelity if you want, you can not improve it without mods to a radio. Its always nice to have CLEAN and QUIET audio power available, even if you want to limit the frequency response and volume. Without a K3, you could put the audio through a 10 band eq, and limit the response to whatever you want, even very narrow for CW, or widen it up for swl or AM work. Used high quality audio equipment is VERY inexpensive... Brett N2DTS > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of F5vjc > Sent: Saturday, August 25, 2007 4:05 AM > To: Elecraft > Subject: [Elecraft] "lousy audio" ? > > So, how about someone comming up with a good communications quality > amplified speaker and enclosure design, RFI proof of course! > > I would build one...I believe there was/is an Elecraft design but it > looked overly complex... > > Anyone care to suggest a suitable audio chip, speaker and enclosure? > > -- > 73, Deni > > F5VJC > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Also for those interested in good audio powered by 12 volts, do a search
on Ebay for 'equalizer booster' and you will find several high powered, 12 volt, equalizers. Most can be directly driven with a speaker output from a receiver, and if you want to drive them from a high impedance line input it is usually a simple matter to locate and remove the input swamping resistor. They do take a lot of 12 volt power, but it is one inexpensive solution to the power amplifier. Don''t forget to fuse the speaker leads too - 100 watts per channel is a lot of power (even if it is peak power) and can melt speaker voice coils quickly. 73, Don W3FPR Brett gazdzinski wrote: > I think it would be a lot easier (but not as much fun) to > buy a good bookshelf speaker and small hifi amp. > I got a set of little hifi speakers from a place that sold > used hifi gear cheap, hooked them up to an old hifi > amplifier, and into the computer sound card for games. > I used to play flying games a long time ago.... > > The sound was fantastic, not like what computer speakers > typically do, but 50 real watts per channel and GOOD speakers. > When you crashed or ran into something, you FELT it. > > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Speaking of Speakers...
Anyone have experience with the Sounds Sweet Speaker? This was supposedly designed for the purposes we are complaining about. http://www.soundssweet.com/ -- JT Croteau, N1ESE - Manchester, NH _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Yes, I have a Sounds Sweet speaker. I like it. It's really quite large,
though. 73 de Dick, K6KR -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of JT Croteau Sent: Saturday, August 25, 2007 7:18 AM To: [hidden email] Subject: Re: [Elecraft] "lousy audio" ? Speaking of Speakers... Anyone have experience with the Sounds Sweet Speaker? This was supposedly designed for the purposes we are complaining about. http://www.soundssweet.com/ -- JT Croteau, N1ESE - Manchester, NH _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.484 / Virus Database: 269.12.4/969 - Release Date: 8/23/2007 4:04 PM _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Deni F5VJC
Hi Deni:
>So, how about someone comming up with a good communications quality >amplified speaker and enclosure design, RFI proof of course! > >I would build one...I believe there was/is an Elecraft design but it >looked overly complex... > >Anyone care to suggest a suitable audio chip, speaker and enclosure? The Motorola amplified (7W to 15W) speakers are GREAT for our uses. Some seem to be more susceptible to RF getting back into them, but at $15 (US), not including shipping, they are a great buy, and MOST (though not all) have proven to be fairly immune from RFI. I have modification (wiring) instructions for many of the Motorola amplified speaker models on my web site at: http://www.n0ss.net/motorola_amp_spkr_mods_20061219.pdf I also have plans for an amplified speaker which you can build into a case of your choosing. See: http://www.n0ss.net/tda2003v_5w-7w_af_amp_v7.pdf If you wish to BUILD a custom K2 amplified speaker into an EC2 case, I can supply some documentation. It's not on my web site, but I will be happy to provide what I have (fairly complete) just for the asking. 73, Tom Hammond N0SS _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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On 8/25/07, Tom Hammond <[hidden email]> wrote:
> If you wish to BUILD a custom K2 amplified speaker into an EC2 case, There's been a neat EC2 companion speaker article on Elecraft's site for quite awhile. It was built by VE6DRW. http://www.elecraft.com/TechNotes/SP2%20External%20Speaker%20for%20the%20K2.pdf I've been thinking about building one. -- JT Croteau, N1ESE - Manchester, NH _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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I built the speaker from the plans on the Elecraft site. Works very well.
http://www.arkayengravers.com/elecraft/sp2/ has some pix. Not entirely finished. I think I might put in one of N0SS's TDA2003V amplifiers. 73 Ken WB2ART JT Croteau wrote: > On 8/25/07, Tom Hammond <[hidden email]> wrote: > >>If you wish to BUILD a custom K2 amplified speaker into an EC2 case, > > > There's been a neat EC2 companion speaker article on Elecraft's site > for quite awhile. It was built by VE6DRW. > > http://www.elecraft.com/TechNotes/SP2%20External%20Speaker%20for%20the%20K2.pdf > > I've been thinking about building one. > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by JT Croteau
My project was built using Dave's basic layout, but a different amp.
His is an EXCELLENT ARTICLE. Tom At 10:55 08/25/2007, JT Croteau wrote: >On 8/25/07, Tom Hammond <[hidden email]> wrote: > > If you wish to BUILD a custom K2 amplified speaker into an EC2 case, > >There's been a neat EC2 companion speaker article on Elecraft's site >for quite awhile. It was built by VE6DRW. > >http://www.elecraft.com/TechNotes/SP2%20External%20Speaker%20for%20the%20K2.pdf > >I've been thinking about building one. > >-- >JT Croteau, N1ESE - Manchester, NH >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >You must be a subscriber to post to the list. >Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/subscribers.htm >Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Deni F5VJC
I built my external speaker using Tom Hammond's excellent instructions and
amp. http://k2qrp.com/Radio%20Projects.htm I have since improved the basic speaker amp combination with the New England QRP NESCAF audio filter http://newenglandqrp.org/nescaf I am very pleased with the results 73, Chuck K2CG -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of F5vjc Sent: Saturday, August 25, 2007 3:05 AM To: Elecraft Subject: [Elecraft] "lousy audio" ? So, how about someone comming up with a good communications quality amplified speaker and enclosure design, RFI proof of course! I would build one...I believe there was/is an Elecraft design but it looked overly complex... Anyone care to suggest a suitable audio chip, speaker and enclosure? -- 73, Deni F5VJC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Deni F5VJC
With the increasing popularity of using headsets with computer sound output
there is a vast surplus of sound systems built for computers, that were usually packaged with the computer, that are gathering dust in garages everywhere. I've got so many lying around I usually haul them to the local Ham club meetings to give away. The sound quality ranges from poor to truly remarkable.Some are speakers only that rely on the output of the sound card for volume and some come equipped with built in amps and a wall wart or power plug. I tried about 10 of them on my K2 and had results that were all positive and most sounded very good. No modification was needed to use any of them. I tried them on my FT 100 which has severe sound quality problems with the built in speaker. I have been using a 3 Inch "LCS-80M" in a plastic box (made in China) with the FT-100 and had good sounding audio for years. I use it primarily for when IO want to use the GC AM frequencies. To summarize - lots of good cheap or free stuff out there if you want it. Al WA6VNN ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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One more idea:
For those who subscribe to QST, take a look at Oct 2004, page 28 titled "A High Quality Speaker System for the Ham Shack". It has a switchable response to handle both communications and music. For the "wood butchers" in the group......gentlemen, start your table saws! 73, Roger WA7BOC K2 #755...still for sale, by the way ;-) _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Tom Hammond-2
On Sat, 25 Aug 2007, Tom Hammond wrote:
> > Some seem to be more susceptible to RF getting back into them, but at > $15 (US), not including shipping, they are a great buy, and MOST > (though not all) have proven to be fairly immune from RFI. Is there a list of the models that have the best rfi immunity? Thom,EIEIO Email, Internet, Electronic Information Officer www.baltimorehon.com/ Home of the Baltimore Lexicon www.tlchost.net/hosting/ Web Hosting as low as 3.49/month _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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At 18:05 08/25/2007, Thom LaCosta wrote:
>On Sat, 25 Aug 2007, Tom Hammond wrote: >>Some seem to be more susceptible to RF getting back into them, but at >>$15 (US), not including shipping, they are a great buy, and MOST >>(though not all) have proven to be fairly immune from RFI. > >Is there a list of the models that have the best rfi immunity? Unfortunately, not to my knowledge... MOST seem pretty immune, esp. of your antennas aren't right on top of the shack. Tom _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by JT Croteau
$160.00 is a bit steep for one speaker.
Radio shack used to sell a dual cone speaker for about $10.00 that was quite efficient... big magnet. $150.00 seems a bit much for a cabinet... Brett N2DTS > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of JT Croteau > Sent: Saturday, August 25, 2007 10:18 AM > To: [hidden email] > Subject: Re: [Elecraft] "lousy audio" ? > > Speaking of Speakers... > > Anyone have experience with the Sounds Sweet Speaker? This was > supposedly designed for the purposes we are complaining about. > > http://www.soundssweet.com/ > > -- > JT Croteau, N1ESE - Manchester, NH > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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