JohnR, Thanks for the explanation. I'll look at the web site. I suppose the capacitance should be chosen just to conduct the UHF RF to ground.
JohnT -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of John J. Riddell Sent: Sunday, August 31, 2008 8:16 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Wits End -- Desense John, Feed thru capacitors look like a peice of wire with a "blob" in the middle, and have a 1/4" locknut on one side. You drill the chassis and insert the feed thru cap then mount it tightly with a nut. Then attach the incoming wires to the outside of the cap. Check Maggiore's web site...you might see a picture of them there as they use them on their Tx and Rx assemblies. John VE3AMZ ----- Original Message ----- From: John Transue <mailto:[EMAIL PROTECTED]> To: Repeater-Builder@ <mailto:Repeater-Builder@yahoogroups.com> yahoogroups.com Sent: Sunday, August 31, 2008 4:55 PM Subject: RE: [Repeater-Builder] Wits End -- Desense Chuck, John Bob, Derek, Eric, Mike, JohnB, and Tom, Thank you all for the helpful suggestions. The connectors appear to be perfect, and they check out with DC. The cable on the RX side is double shielded RG142B/U. The cable on the TX side is not marked with a complete designation. It says AWM Style 1354, but there are many cables that are said to be UL AWM Style 1354. Some of these are 75 ohm, some are 50 ohm. This cable is only six inches long. I plan to replace this as soon as I can get RG400 or other suitable cable. BNC connectors are used on both the RX unit and the TX unit. I don't know what it means to have a feed through capacitor in series with a control or audio or power cable. However, a capacitor to ground might be good to get rid of stray RF. Pray if you are so inclined. Otherwise, hope we can make the physics work. Thanks again, JohnT -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Chuck Kelsey Sent: Sunday, August 31, 2008 3:06 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Wits End -- Desense I was wondering the same thing. Has someone added some wiring and subsequently breached the integrity of the shielding effectiveness somewhere? First thing to come to mind is controller interfacing and CTCSS wiring. Chuck WB2EDV ----- Original Message ----- From: John J. Riddell <mailto:[EMAIL PROTECTED]> To: Repeater-Builder@ <mailto:Repeater-Builder@yahoogroups.com> yahoogroups.com Sent: Sunday, August 31, 2008 2:43 PM Subject: Re: [Repeater-Builder] Wits End -- Desense John, Make sure that every wire going in to the RX and TX box has a feed thru cap in series with it. Also you might put a few small ferrite beads on each wire as well. John VE3AMZ __________ NOD32 3192 (20080616) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com
