Spurious

[Julian, G4ILO]

Tom Hammond-2 wrote

I personally prefer UNamplified Motorola Mobile speakers, available regularly
on EBay for $10 or less.

I have a pair of passive speakers that look very like those though they may not be made by Motorola, but they are a bit lacking in bass for my liking and I prefer the sound of the internal speaker.

I have a pair of cheap Trust computer speakers which sound good but I needed to wind all the cables on ferrites to keep the RF out and still got some breakthrough on some bands. And unfortunately they looked like cheap computer speakers.

I ordered some Logitech speakers which were black and looked good next to the K3 but it turned out they were so wide open to RFI they were picking up a buzz from a nearby DECT cordless phone and I nearly had heart failure the first time I pressed the PTT. The trouble with computer speakers is that most of them are unshielded and there is usually no way to get inside them to add bypass capacitors and filters except by using a hammer.

So I'm still looking for some smart, compact, RFI-proof speakers with decent bass response, preferably passive (who needs another wall-wart) that I can use with my K3. I don't have space for hi-fi bookshelf speakers.

[Ken Chandler]

Jerry
Read between the lines! I was refering to the workaround oc
Why do you think I removed the speaker so as NOT to pullute the bands  
unintentionally.
End

Ken..

Sent from my iPhone




On 22 Dec 2009, at 17:56, "Jerry T. Dowell" <[hidden email]> wrote:

> Minor issue?? Polluting the bands with spurs is a "minor issue"?
>
> Thankfully the immediate fix is trivial!
>
> Jerry   AI6L
>
> -----Original Message-----
> From: Ken Chandler [mailto:[hidden email]]
> Sent: Tuesday, December 22, 2009 8:45 AM
> To: Phil Hystad
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] Spurious
>
> Well I have done this yesterday ie removed / disconnected the internal
> speaker so it cannot occur again. It's a fix until Wayne es the boys
> can move up on this minor Issue.
>
> Ken..G0ORH sn3759
>
> Sent from my iPhone
>
>
>
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[Eric Swartz - WA6HHQ]

Let's end this thread for now. Wayne is looking at this very seriously.

73,
Eric
Elecraft List Moderator


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[Jim Brown-10]

On Tue, 22 Dec 2009 11:20:48 -0600, Tom Hammond wrote:

>I personally prefer UNamplified Motorola Mobile speakers, available
>regularly on EBay for $10 or less.

Yes

>The AMPLIFIED Motorola speakers are also good, but require external
>power.

I haven't seen any of these. BUT -- be VERY cautious with amplified
speakers. In my short life (68 years), I've seen a LOT of amplified
speakers, and I've only seen one that didn't suffer from RFI. It cost
$3K.

73,

Jim K9YC


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[akiwi ham]

I do, all the time. I would be surprised if I was the only K3 owner
that does.

Bryan, Zl1NI

>
> I mean, who uses the built in speaker anyway.....................
>
> phil, K7PEH

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[Hisashi T Fujinaka]

Motorola Powervoice speakers should have some shielding because they
were meant to work with Motorola mobile radios.

On Tue, 22 Dec 2009, Jim Brown wrote:

> On Tue, 22 Dec 2009 11:20:48 -0600, Tom Hammond wrote:
>
>> I personally prefer UNamplified Motorola Mobile speakers, available
>> regularly on EBay for $10 or less.
>
> Yes
>
>> The AMPLIFIED Motorola speakers are also good, but require external
>> power.
>
> I haven't seen any of these. BUT -- be VERY cautious with amplified
> speakers. In my short life (68 years), I've seen a LOT of amplified
> speakers, and I've only seen one that didn't suffer from RFI. It cost
> $3K.

--
Hisashi T Fujinaka - [hidden email]
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte
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[Buck - k4ia]

I use the Sounds Sweet.  It has gotten a bit pricey but it has the  
advantage of cutting down on the high frequencies.  This helps the "noisy  
receiver" issues that occupied so much bandwidth over the past few days. (Please  do
not take this as an invitation to beat that dead horse any more!)
 
Buck
k4ia
K3#101
 
 
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[Jim Brown-10]

On Tue, 22 Dec 2009 10:32:51 -0800 (PST), Hisashi T Fujinaka wrote:

>Motorola Powervoice speakers should have some shielding because they
>were meant to work with Motorola mobile radios.

Yes, but Motorola radios are VHF/UHF. In general, things that kill RFI
at VHF/UHF may not fix it at HF (like "pin 1 problems") and vice versa.

73,

Jim K9YC


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[David Cutter]

Jim

I know of a military amplified loudspeaker which *should not* suffer from
RFI, since it passed the required emc specs for land vehicles.  They're
nothing like $3000, but certainly not really for amateur budgets.  Starting
with a metal enclosure helps a lot.  I have a few rejects if anyone is
interested - off list.

David
G3UNA



----- Original Message -----
From: "Jim Brown" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, December 22, 2009 6:30 PM
Subject: Re: [Elecraft] Spurious

> On Tue, 22 Dec 2009 11:20:48 -0600, Tom Hammond wrote:
>
>>I personally prefer UNamplified Motorola Mobile speakers, available
>>regularly on EBay for $10 or less.
>
> Yes
>
>>The AMPLIFIED Motorola speakers are also good, but require external
>>power.
>
> I haven't seen any of these. BUT -- be VERY cautious with amplified
> speakers. In my short life (68 years), I've seen a LOT of amplified
> speakers, and I've only seen one that didn't suffer from RFI. It cost
> $3K.
>
> 73,
>
> Jim K9YC
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html 

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[Cookie]

I bought a pair of HP Speakers that are 3.5X6 that are black and look nice.  I don't have an RFI problem with them connected to my computer which is on the ham shack desk but I have yet to try them connected to the K3.  They are only $20 at Walmart and they look a lot better than my Labtecs.  I may need to buy another pair.  Unfortunately, they do not have a  balance control, but the K3 can be set up to use the sub receiver audio gain as a balance if I remember correctly.
 
Willis 'Cookie' Cooke
K5EWJ




________________________________
From: "Julian, G4ILO" <[hidden email]>
To: [hidden email]
Sent: Tue, December 22, 2009 12:00:04 PM
Subject: [Elecraft] [K3] External speakers



Tom Hammond-2 wrote:
>
> I personally prefer UNamplified Motorola Mobile speakers, available
> regularly
> on EBay for $10 or less.
>
I have a pair of passive speakers that look very like those though they may
not be made by Motorola, but they are a bit lacking in bass for my liking
and I prefer the sound of the internal speaker.

I have a pair of cheap Trust computer speakers which sound good but I needed
to wind all the cables on ferrites to keep the RF out and still got some
breakthrough on some bands. And unfortunately they looked like cheap
computer speakers.

I ordered some Logitech speakers which were black and looked good next to
the K3 but it turned out they were so wide open to RFI they were picking up
a buzz from a nearby DECT cordless phone and I nearly had heart failure the
first time I pressed the PTT. The trouble with computer speakers is that
most of them are unshielded and there is usually no way to get inside them
to add bypass capacitors and filters except by using a hammer.

So I'm still looking for some smart, compact, RFI-proof speakers with decent
bass response, preferably passive (who needs another wall-wart) that I can
use with my K3. I don't have space for hi-fi bookshelf speakers.

-----
Julian, G4ILO. K2 #392  K3 #222.
* G4ILO's Shack - http://www.g4ilo.com
* KComm - http://www.g4ilo.com/kcomm.html
* KTune - http://www.g4ilo.com/ktune.html

--
View this message in context: http://n2.nabble.com/Spurious-tp4198871p4204836.html
Sent from the [K3] mailing list archive at Nabble.com.
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[ab2tc]

Hi all,

This is a rather long thread and I am not sure how relevant this response is, but I'll risk it anyway. I use headphones 99% of the time, but when I need speakers (as when I want other people in the shack to listen in) I use a pair or of amplified computer speakers by JBL that came with some computer I bought several years ago. They are pretty decent (you can see them on my QRZ.com picture) but poorly shielded as expected. They are connected to the computer sound card's line out and the computer's line in is connected to the K3's line out. This is very convenient as I don't need a separate pair of speakers for the radio. If I key up a 5W 2m HT in the shack they hum like mad. But I have no interference in them from my HF rig simply because my HF antennas are sufficiently far (not terribly far) removed from the house and are balanced. It seems to me that if you have a serious problem with RFI into the amplified speakers in your shack, you are also going to have RFI into your (poorly shielded) stereo system, TV, telephones and just about any electronic device in your house (and your neighbor's house).

AB2TC - Knut

David Cutter wrote

Jim

I know of a military amplified loudspeaker which *should not* suffer from
RFI, since it passed the required emc specs for land vehicles.  They're
<snip>

[Julian, G4ILO]

ab2tc wrote

It seems to me that if you have a serious problem with RFI into the amplified speakers in your shack, you are also going to have RFI into your (poorly shielded) stereo system, TV, telephones and just about any electronic device in your house (and your neighbor's house).

In my experience computer speakers are the most RFI prone devices in existence. My antennas are in the attic directly above the shack which is obviously a worst-case scenario but my wife can watch TV, listen to the radio, use the phone or the computer with no problems when I'm on the radio.

[Earl N5ZM]

I have used the 'COMspkr' from West Mountain Radio for 4 months now with
no problems. Even at times using 1500w RTTY or CW. They are stereo
(Amplified) and a nice match to the K3.

Usual disclaimer, no connection, just a satisfied user.

Earl N5ZM..


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[Dan in Florida]

Hi Earl,

Interesting post.  I had not previously seen these speakers.

Their website advertises them as computer speakers, which are impervious to
RF.  If I understand you correctly, however, you use them as external
speakers for your K3.

Thanks,
Dan - W4TQ

.......................................

I have used the 'COMspkr' from West Mountain Radio for 4 months now with
no problems. Even at times using 1500w RTTY or CW. They are stereo
(Amplified) and a nice match to the K3.

Usual disclaimer, no connection, just a satisfied user.

Earl N5ZM..

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[w8fn]

>I personally prefer UNamplified Motorola Mobile speakers, available regularly
>on EBay for $10 or less.

I second this. I just got a second Moto speaker to use on the Right
channel that complements the one I've been using for years. They're
cheap, bulletproof and tuned specifically for communications audio.
And they can play really LOUD without much distortion if you want them to.

73...
Randy, W8FN

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