[Mobile-Portable] More noise cures

[N5WV]

Sonny , You are a stand up guy and a first class ham radio operator like the ones from years ago. This is a fantastic site with good people. Another item making noise worse is the bad band conditions we have had for years. Stronger signals cover up the small amount of noise I have left. But I like 20 meters and even with the solar flux being over 200 , the bands at 20 and above are still down. There have been a few good openings but I am comparing it to the bands in solar minimum back in the 80s and 90s. Even with high flux numbers the bands are still down compared to back then. I have heard time after time from seasoned old time radio operators that they have never seen conditions this bad in there 50 years of operating. Im starting to wonder if there is something that our science does not know about the sun and propagation that is now happening. I remember working Europe every morning on 10 meters with the band full of European operators . Then Africa around noon or a bit later and Australia that evening. Then after Japan the bands would close around 0200-Z. If the bands were back like that the noise would not be a problem. But I believe we do not have a cure for that problem here. And Im getting off topic a bit. Enjoy the evening , Randy N5WV 

----- Original Message -----
From: N1KHB at aol.com 
To: mobile-portable at mailman.qth.net 
Sent: Sunday, January 19, 2014 12:52:05 PM 
Subject: [Mobile-Portable] More noise cures 

Randy and all, 
I just plugged in a search phrase of "fuel injector electrical noise 
radiation" and received enough potentially useful returns that it appears 
hopeful that some of the authors might have some experience. I didn't read 
any, but the titles suggest promise. 
And just off the top of my head, I'm thinking back to my electronics 
experience. One of my solenoid (an injector is a solenoid, right?) projects 
which radiated unacceptably was tamed with ceramic bypass caps. Think 
risetime and thus bandwidth reduction here. And way back in tech school we were 
told that connecting reverse biased diodes across relay and solenoid coils 
never hurt and usually helped. The coil resonates when power is removed 
abruptly and the first reverse alternation is greatly suppressed by the diode 
becoming forward biased in that phase thus quickly killing the noise burst. 
I don't know if vehicle companies have either, or any, such 
suppression. Something to investigate I suppose. 

Best, 
Sonny N1KHB 


______________________________________________________________ 
Mobile-Portable mailing list 
Home: http://mailman.qth.net/mailman/listinfo/mobile-portable 
Help: http://mailman.qth.net/mmfaq.htm 
Post: mailto:Mobile-Portable at mailman.qth.net 

This list hosted by: http://www.qsl.net 
Please help support this email list: http://www.qsl.net/donate.html