Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[AMPS\]\s+Cantenna\s+Dummy\s+Loads\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[AMPS\]\s+Cantenna\s+Dummy\s+Loads\s*$/: 23 ]

Total 23 documents matching your query.

1. [AMPS] Cantenna Dummy loads (score: 1): Author: wlfuqu00@pop.uky.edu (William L. Fuqua III); Date: Wed, 3 Feb 1999 09:10:49 -0500 (EST); The Cantenna dummy loads just can't take 1.5 Kw for very long. I was wondering if anyone has tried to cool one of these. Either by running water thru the can in a coil of copper tubing or maybe even; /archives//html/Amps/1999-02/msg00094.html (8,406 bytes)
2. [AMPS] Cantenna Dummy loads (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 3 Feb 1999 08:50:04 -0800; Indeed. The resistor used typ. looks like an approx. 100w unit. Apparently the name "dummy load" refers to those who expect to be able to put 1.5kW of NØN (AØ, keydown) through it Dire; /archives//html/Amps/1999-02/msg00099.html (9,349 bytes)
3. [AMPS] Cantenna Dummy loads (score: 1): Author: johnf@futurenet.co.za (John Fielding); Date: Wed, 3 Feb 1999 17:02:37 +0200; Water cooled dummy loads are commonly used in the broadcast transmitter scene. I once visited Marconi in Chelmsford to do some acceptance tests on a 100kW transmitter. In each bay where the transmitt; /archives//html/Amps/1999-02/msg00104.html (11,304 bytes)
4. [AMPS] Cantenna Dummy loads (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Wed, 3 Feb 1999 11:59:34 -0500; You can use a 5 Gallon can which are usually throw aways from auto body shops. With some creative work with tin shears, drill, and a propane torch you can adapt the Cantenna as a unit. Thoroughly was; /archives//html/Amps/1999-02/msg00106.html (9,827 bytes)
5. [AMPS] Cantenna Dummy loads (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 3 Feb 1999 10:34:20 -0800; ? With a resistor that is spec'd at 100 or so watts, this solution sounds somewhat unlikely. If transformer oil vapour-bubbles begin to form on the surface of the resistor, which seems quite likely,; /archives//html/Amps/1999-02/msg00110.html (9,434 bytes)
6. [AMPS] Cantenna Dummy loads (score: 1): Author: mgilmer@gnlp.com (Gilmer, Mike); Date: Wed, 3 Feb 1999 14:02:05 -0500; Not knowing the innards of the Cantenna, may I suggest a quick test for the usefulness of simply a bigger can of oil. The test would be to see if the sides of the existing Cantenna are warm after the; /archives//html/Amps/1999-02/msg00111.html (10,166 bytes)
7. [AMPS] Cantenna Dummy loads (score: 1): Author: wlfuqu00@pop.uky.edu (William L. Fuqua III); Date: Wed, 3 Feb 1999 14:15:25 -0500 (EST); The water cooling coils have the advantage that convection currents of oil should be formed as the warmer oil rises around the resistor and flows downward at the outer region of the can thru the cool; /archives//html/Amps/1999-02/msg00112.html (9,258 bytes)
8. [AMPS] Cantenna Dummy loads (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 3 Feb 99 13:34:07 -0600; The can does get warm after running 1500 watts on it for a bit. Most RF resistors have limitations in power handling due to their ability to get heat out of the resistive junction. If one has an inf; /archives//html/Amps/1999-02/msg00113.html (11,804 bytes)
9. [AMPS] Cantenna Dummy loads (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 3 Feb 1999 11:44:20 -0800; agreed Pretty much, Mike, and the change seems to be permanent. Typically R increases roughly 50% unless the resistor cracks. However, if one needs a 75 ohm termination, why not? Rich... R. L. Measu; /archives//html/Amps/1999-02/msg00114.html (9,761 bytes)
10. [AMPS] Cantenna Dummy loads (score: 1): Author: mgilmer@gnlp.com (Gilmer, Mike); Date: Wed, 3 Feb 1999 15:08:10 -0500; I'm not sure if I understand the first sentence entirely, but it seems to indicate that you are counting on the presence of the water coils as being sufficient to cause or improve oil circulation. I; /archives//html/Amps/1999-02/msg00115.html (11,073 bytes)
11. [AMPS] Cantenna Dummy loads (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Wed, 03 Feb 1999 15:55:14 EST; Well, I have two cantennas and have run both of them at 2KW without any problems with SWR shift BUT I've never left it key down more than about 1 minute continuous. Both use transformer oil. I did bu; /archives//html/Amps/1999-02/msg00116.html (11,212 bytes)
12. [AMPS] Cantenna Dummy loads (score: 1): Author: phil@vaxxine.com (Phil T. (VE3OZZ)); Date: Wed, 03 Feb 1999 19:10:49; Bill, you could put the Cantenna on a magnetic stirrer, with the spinner in the bottom of the Cantenna can. This would circulate the oil and enable longer periods of full power operation. Since you a; /archives//html/Amps/1999-02/msg00120.html (9,887 bytes)
13. [AMPS] Cantenna Dummy loads (score: 1): Author: ve3bbh@interlog.com (Paul Hicks, VE3BBH / VE3ZT); Date: Wed, 03 Feb 1999 21:03:40 -0500; Right on, the sides of the Cantenna stay nice and cool. I was the first ham on the block back in the 70s to get a Craptenna, real pretty, it matched the Drake Line. Mooched some transformer oil from; /archives//html/Amps/1999-02/msg00125.html (9,486 bytes)
14. [AMPS] Cantenna Dummy loads (score: 1): Author: k1ta@earthlink.net (Bob Marston); Date: Wed, 03 Feb 1999 18:22:44 -0800; fitting So that's why your grass grows so well :-) 73s Bob K1TA -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/1999-02/msg00127.html (8,388 bytes)
15. [AMPS] Cantenna Dummy loads (score: 1): Author: ab2et@juno.com (Zdzislaw R Sawicki); Date: Wed, 3 Feb 1999 22:04:09 -0500; Bill' One of the problems with the "Cantenna" is that the oil stays in place and forms strata when you put in the power. No need for any "Fancy" heat Exchanger.... To give me some more "leeway" I ins; /archives//html/Amps/1999-02/msg00132.html (11,037 bytes)
16. [AMPS] Cantenna Dummy loads (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 4 Feb 1999 14:41:13 -0000; I worked in that lab over 30 years ago, as an apprentice. The fun came if you got an air bubble in the water - the 50 watt resistors would burn up in apparently half no time at 30kW if that happened.; /archives//html/Amps/1999-02/msg00133.html (9,031 bytes)
17. [AMPS] Cantenna Dummy loads (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 4 Feb 1999 14:54:34 -0000; If the cantenna can is steel, this isn't going to work - the cantenna can will act as a shield. Water has a dielectric constant of 81, so any dimensioning for using oil may well have a poor swr at V; /archives//html/Amps/1999-02/msg00135.html (8,748 bytes)
18. [AMPS] Cantenna Dummy loads (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 4 Feb 1999 11:14:35 -0500; . Try it before you criticize it. 73 Carl KM1H ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely fr; /archives//html/Amps/1999-02/msg00138.html (10,153 bytes)
19. [AMPS] Cantenna Dummy loads (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Thu, 4 Feb 1999 11:34:52 -0500; On Wed, 03 Feb 1999 15:55:14 EST Mark S Graalman <wb8jkr@juno.com> writes: And that uses two 1 gallon cans in series. If you were to take it a step further and mount that load in a 5 gallon can with; /archives//html/Amps/1999-02/msg00139.html (12,635 bytes)
20. [AMPS] Cantenna Dummy loads (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 4 Feb 1999 16:42:50 -0000; For continuous duty (tell it not in garth, whisper it not in the streets of Absolon) if you limit yourself to 21 or 28 MHz at night when the band is closed, there's always the antenna................; /archives//html/Amps/1999-02/msg00140.html (8,286 bytes)

Current List: 1 - 20
Page: [1] [2]