Re: [Repeater-Builder] Fan audio
Ken Arck wrote: At 02:22 PM 4/9/2004 -0400, you wrote: Either run AC fans or use a different power supply than the one running your repeater to power those DC ones ---I'm running two 12 Vdc fans in my Micor repeater. I use a 200 uh choke in each lead (+ -) and a 1000 mf cap across them, on the supply side. I then use a transistor to control 'em and I have absolutely no noise whatsoever using this scheme. I suspect part of the problem is that most people forget to treat both supply lines and noise gets introduced due to ground loops and stray currents. Ken The Micor supply and repeater are well filtered, better than most. Where the problem lies is folks using an Astron and the capacitance isn't big enough or the equipment is more susceptible. Kevin Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Fan audio
Thanks, this makes sense to me, I'll try it. It is a portable repeater so I would like the fan to run off of the same DC supply as the rest of the rig. PaulKen Arck [EMAIL PROTECTED] wrote: At 02:22 PM 4/9/2004 -0400, you wrote:Either run AC fans or use a different power supply than the one running your repeater to power those DC ones---I'm running two 12 Vdc fans in my Micor repeater. I use a 200 uh chokein each lead (+ -) and a 1000 mf cap across them, on the supply side. Ithen use a transistor to control 'em and I have absolutely no noisewhatsoever using this scheme. I suspect part of the problem is that most people forget to treat bothsupply lines and noise gets introduced due to ground loops and stray currents.Ken--President and CTO - Arcom CommunicationsMakers of state-of-the-art repeater controllers and accessories.http://www.ah6le.net/arcom/index.htmlAH6LE/R - IRLP Node 3000http://www.irlp.netYahoo! Groups Links* To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/* To unsubscribe from this group, send an email to:[EMAIL PROTECTED]* Your use of Yahoo! Groups is subject to:http://docs.yahoo.com/info/terms/Do you Yahoo!? Yahoo! Tax Center - File online by April 15th Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Fan audio
On running DC fans on repeater projects - half of the problem-childs I have seen are noise super-imposed on the DC lines, and half are radiated noise caused by cheap brush or brushless fans found at the swaps. I use 220 AC fans run on 110, and they seem to work just fine... - Adam - Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Fan audio
Paul Guello wrote: I put a dc fan on the portable repeater and now I get a slight buz on the audio. Anybody have any idea how to get rid of the buz? I tried putting a capacitor across it and an inductor in series, do I need a larger inductor? Either run AC fans or use a different power supply than the one running your repeater to power those DC ones Kevin Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Fan audio
At 02:22 PM 4/9/2004 -0400, you wrote: Either run AC fans or use a different power supply than the one running your repeater to power those DC ones ---I'm running two 12 Vdc fans in my Micor repeater. I use a 200 uh choke in each lead (+ -) and a 1000 mf cap across them, on the supply side. I then use a transistor to control 'em and I have absolutely no noise whatsoever using this scheme. I suspect part of the problem is that most people forget to treat both supply lines and noise gets introduced due to ground loops and stray currents. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Fan audio
I agree with Ken about most forget to treat both the + and the - lines i use the same setup a 200uh choke in each lead, but i have two 470uf caps across them .. and i have had no noise at all - Original Message - From: Ken Arck [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Friday, April 09, 2004 1:35 PM Subject: Re: [Repeater-Builder] Fan audio At 02:22 PM 4/9/2004 -0400, you wrote: Either run AC fans or use a different power supply than the one running your repeater to power those DC ones ---I'm running two 12 Vdc fans in my Micor repeater. I use a 200 uh choke in each lead (+ -) and a 1000 mf cap across them, on the supply side. I then use a transistor to control 'em and I have absolutely no noise whatsoever using this scheme. I suspect part of the problem is that most people forget to treat both supply lines and noise gets introduced due to ground loops and stray currents. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links --- [This E-mail scanned for viruses at TNWEB LLC] --- [This E-mail scanned for viruses at TNWEB LLC] Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
