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1. [Amps] 8877 blower requirement ? (score: 1): Author: Hugh Duff <hduff@cogeco.ca>; Date: Thu, 05 Apr 2007 08:51:00 -0400; I have just about finished building a W6PO style 8877 amplifier for 2 metres and I now need to install a blower. I have a 2C610 (140 CFM) and a 4C440 (60 CFM) and I'm wondering which one, if either,; /archives//html/Amps/2007-04/msg00009.html (6,765 bytes)
2. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Sugiyama <ji3kdh@2333.net>; Date: Thu, 05 Apr 2007 22:11:11 +0900; Hugh, We can see it in here. http://www.g8wrb.org/data/Eimac/3CX1500A7.pdf 73 Sugi JI3KDH _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2007-04/msg00010.html (7,141 bytes)
3. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 05 Apr 2007 14:45:59 +0100; As well as a data sheet with airflow figures, you can also find an article describing how to estimate what flow/pressure a blower will produce. In general, CFM ratings are not a useful guide - you ne; /archives//html/Amps/2007-04/msg00011.html (7,107 bytes)
4. Re: [Amps] 8877 blower requirement ? (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Thu, 5 Apr 2007 10:10:51 -0600; Hugh, The 4C440 only has 60 CFM at 0 static pressure... an 8877 needs around 40 cfm at .6" SP. and the 4c440 does not meet this spec. I do not know the specs on the 2C610 but it is probably around 70; /archives//html/Amps/2007-04/msg00012.html (8,806 bytes)
5. Re: [Amps] 8877 blower requirement ? (score: 1): Author: "Mike McCarthy, W1NR" <lists@w1nr.net>; Date: Thu, 05 Apr 2007 12:47:45 -0400; The 3CX1500A7/8877 lists the minimum airflow and static pressure required for adequate cooling at various power levels and altitudes. For example at the maximum 1500W dissipation level 38 CFM at .60; /archives//html/Amps/2007-04/msg00013.html (10,086 bytes)
6. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 6 Apr 2007 07:56:15 +0200 (CEST); What's the mechanism whereby too much air affects the emission? Is it that the tube structure is normally well above ambient by conduction from the cathode, and excess air reduces this temperature, a; /archives//html/Amps/2007-04/msg00016.html (7,770 bytes)
7. Re: [Amps] 8877 blower requirement ? (score: 1): Author: "Bob Alexander" <realex@flash.net>; Date: Fri, 6 Apr 2007 07:39:02 -0600; Howdy, I did some research on the w6po amp. I assumed it was a 1500 W output amp not a 1KW input amp. Big difference. At 1 KW input and dissipation on the order of 500-600 watts the 4C440 blower shou; /archives//html/Amps/2007-04/msg00019.html (11,615 bytes)
8. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 6 Apr 2007 16:02:01 +0100; Umm, beg to differ. What actually provides the heat transfer is the mass flow rate of air (grams per second) and its specific heat. Unfortunately the mass flow rate of a gas is very difficult to meas; /archives//html/Amps/2007-04/msg00020.html (10,756 bytes)
9. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 06 Apr 2007 17:09:16 +0100; I don't think we differ. What I meant was that blower cfm ratings alone are not a useful guide to suitability for a given valve. First you have to establish if the blower can produce the pressure -; /archives//html/Amps/2007-04/msg00021.html (8,936 bytes)
10. Re: [Amps] 8877 blower requirement ? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 6 Apr 2007 19:05:28 +0100; Sorry, I misread your previous posting as referring to the CFM rating of the tube, not the blower. Very much agree about the CFM rating of the blower being of little use. It is the maximum output wit; /archives//html/Amps/2007-04/msg00022.html (9,987 bytes)

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