CB's & Police calls on my sound card

[Dominus]

Thats not your sound card, thats your speakers. Are they a cheap, dinky pair? (no offence) Or are they unshielded?

Try a good set of headphones & see if you get the same problem.

[This message has been edited by Dominus (edited 09-23-99).]

[WPee]

Yep! their worth what I paid for them <grin>

But how else would I get the latest pump prices.... and who has the best donuts?

[MrEd]

Sounds like a problem with sheilding on your speakers. I used to use my CB to freak out drive through attendants at McDonalds. If you have a big enough linear on your CB, you can place your order from a block away. Police radios use a higher frequency which makes use of repeaters. I don't know why they would bleed through your speakers unless they are just really REALLY cheap ones. Try plugging in a different pair of speakers to see if that takes care of the "problem". Or think on the bright side: You have the cheapest police scanner in the neighborhood.
Now that I think about it, if you hear police officers talking to each other from car to car, they could be using CB's also. A lot do that nowadays to cut down on chatter on the Police radios.

-MrEd
/forum/smile.gif


[This message has been edited by MrEd (edited 09-23-99).]

[KillerBug]

Gas prices, or diesel?

[TigerStrike2]

Could you tell us exactly what speakers and how they are set up? /forum/smile.gif

[RobRich]

MrED, using CB's (11 meter) is really cool at the bank. If you have enough wattage, you can usually fuzz out pc monitors and bleed intercoms. Before I got out the communications hobby, I was running nearly 2.4kw at home and over 1kw in my car. Not bad, considering the FCC limit is 4 watts on 11-meter.

[socalgal]

WPee - that's funny. /forum/smile.gif

LOL! MrEd - did they have your food ready when you got to the window? /forum/smile.gif

[Bleep]

This is a problem with rectification. What actually happens is that somewhere there is a corroded joint beetween two large pieces of metal close to your machine. This acts as a rectifier and actually detects the radio signal AM FM SSB makes no difference it reradiates it as a AM signal. The speaker wires act as a antenna turning your speakers into a radio receiver. Here is a easy fix. go to Radio Shack and get some .001 MFD Capacitors. open the speaker box and solder the Cap across the voice coil right where it connects to the coil be really carefull not to melt the voice coil. As to the person runnning 2.5 KW What kind of tubes did you have? 4 813 tubes at 2500 volts will not hardly make it running in class C let alone class A that must be used to be linear. Another thing I might mention is that AM (CB) cannot be linear when amplified after modulation has taken place. a tremendous amount of signal distortion takes place and makes the signal extremly broad banded probably a Megahertz or more. That is what you called bleed.
Bleep

[Joel Kleppinger]

But why would you want to fix it? I'd love to have that problem, too on one of my machines (rather not have my main box, but hey, if it comes, I won't complain /forum/smile.gif)

If you hear any good news that others on the board could use, be sure and pass it on. =)

Oh, and if anyone has a fix for this: http://www.sysopt.com/forum/Forum1/HTML/001778.html , I'd really appreciate it. /forum/wink.gif (Desperate times call for desperate measures /forum/smile.gif)

[WPee]

I get the truckers CB talk and the Police transmissions when they pass by the front of my office and for about a block in each direction.

I did not do anything to the card or the PC.

Just an interesting turn of events.... I now get REAL TIME broadcast of gasoline prices and the best places to buy gas. <big Grin>

[MrEd]

I had food, but it was NEVER with a smile. RobRich: I had a 250Watt bi-linear. I could talk from one side of Tulsa, to the other, regardless of what the other person was using. Cool stuff. I might get back into it someday, but for now, I've devoted all my time to engineering, and computers.

-MrEd
/forum/smile.gif