[Elecraft] OT looking for a part number for a....
50 ohm non reactive 1/4 watt axial lead resistor maybe 1% or better. I have a couple of old amphenol bnc 240 ohm terminators that I want to repurpose to 50 ohm. I am having trouble finding a non reactive part thats good up thru 500mhz. Jeff Herr, WW6L 4636 Kelton Way Sacramento, Ca 95838 916.925.6089 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT looking for a part number for a....
Hi Jeff, Depending on the connector used, and the frequency of interest, I found the Caddock 1/4 W precision film resistors to be good to about 300 MHz, Try, RN55D49R9F. (49.9 ohm 1%) . Allied carries them. Mel, K6KBE On Saturday, September 13, 2014 12:49 PM, Jeff Herr her...@comcast.net wrote: 50 ohm non reactive 1/4 watt axial lead resistor maybe 1% or better. I have a couple of old amphenol bnc 240 ohm terminators that I want to repurpose to 50 ohm. I am having trouble finding a non reactive part thats good up thru 500mhz. Jeff Herr, WW6L 4636 Kelton Way Sacramento, Ca 95838 916.925.6089 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to farrerfo...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT looking for a part number for a....
I would also suggest that the Caddock 50 ohm 915 series power film resistors be considered. Although these are rated at 15 watts with a heatsink, they are rated for 1.25 watts in free air. Mounted to the BNC connector with zero length leads, they should be good up to 500 MHz. See http://www.caddock.com/Online_catalog/Mrktg_Lit/MP9000_Series.pdf I use the higher power ratings (on a heatsink) for dummy loads, and they can be considered 'precision dummy loads' with a 1% tolerance and the top frequency depends on the lead length and other mounting considerations. 150 MHz is practical with little consideration for lead length. Warning - do not exceed the power ratings or they will 'let the smoke out' quickly. 73, Don W3FPR On 9/13/2014 7:17 PM, Mel Farrer via Elecraft wrote: Hi Jeff, Depending on the connector used, and the frequency of interest, I found the Caddock 1/4 W precision film resistors to be good to about 300 MHz, Try, RN55D49R9F. (49.9 ohm 1%) . Allied carries them. Mel, K6KBE On Saturday, September 13, 2014 12:49 PM, Jeff Herr her...@comcast.net wrote: 50 ohm non reactive 1/4 watt axial lead resistor maybe 1% or better. I have a couple of old amphenol bnc 240 ohm terminators that I want to repurpose to 50 ohm. I am having trouble finding a non reactive part thats good up thru 500mhz. Jeff Herr, WW6L 4636 Kelton Way Sacramento, Ca 95838 916.925.6089 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to farrerfo...@yahoo.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] OT looking for a part number for a....
Jeff I doubt you will find any axial leaded part that is good to 500 MHz because the package inductance will roll off response below 500 MHz. However if you insist on axial leaded there are any number of 50.1 ohm metal film, axial leaded parts available from Digikey www.digikey.com. Also Ohmite makes a 50.0 ohm, 50 watt resistor, NI, in a to220 case that is pretty good. Also available from Digikey. You can look up your own part numbers with their online finder. 73 Fred -Original Message- From: Jeff Herr her...@comcast.net Sent: Sep 13, 2014 3:47 PM To: elecraft@mailman.qth.net Subject: [Elecraft] OT looking for a part number for a 50 ohm non reactive 1/4 watt axial lead resistor maybe 1% or better. I have a couple of old amphenol bnc 240 ohm terminators that I want to repurpose to 50 ohm. I am having trouble finding a non reactive part thats good up thru 500mhz. Jeff Herr, WW6L 4636 Kelton Way Sacramento, Ca 95838 916.925.6089 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to fptowns...@earthlink.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
