Subject: | |
From: | |
Reply To: | |
Date: | Thu, 7 Aug 2014 12:50:10 -0400 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
One of the noisiest devices ever produced was the old VersaBraille Classic from TSI. When I'd turn that sucker on, it obliterated the entire spectrum up through 30 MHz. At the time, I didn't have any 6-meter gear so I couldn't check that band, but the noise on other frequencies was unbelievable.
Today, none of my computer equipment generates any noise, which is good because I have a lot more of it than I did back in 1982.
Steve
----- Original Message -----
From: "Steve" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, August 07, 2014 12:27
Subject: Re: more noise
> Who knows. Cheap power supplies aren't very well-shielded.
>
> I remember when my XYL, N7JBY, built a computer for our son. The damn power
> supply was so dirty, it produced an S9 noise spectrum across the whole
> 75-meter band. You could even detect noise from it when the computer was
> turned off; you had to turn the actual power switch on the back of the
> computer off to completely get rid of the noise, and that was with the
> computer twenty-five feet away from the ham station on another floor. Yet,
> other computers will happily run right next to the station with no
> discernible noise.
>
> Sometimes, ya gets whatcha pay for.
>
> Steve, K8SP
>
> ----- Original Message -----
> From: "Howard Kaufman" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, August 06, 2014 6:29 PM
> Subject: more noise
>
>
>>I had to replace the power supply in my main computer today.
>> Now the computer works, but I have birdies all over the broadcast band.
>> Haven't turned on the HF station yet.
>> Will one of those RF line filters help?
>> Is their anything I can do besides replacing the supply again?
>> How do I know the next one won't be worse?
>> I imagine they are all switching supplies these days.
>>
>> H T Kaufman MSW LCSW
>> Adaptive Technology Instructor
>>
>> ---
>> This email is free from viruses and malware because avast! Antivirus
>> protection is active.
>> http://www.avast.com
>
|
|
|