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1. [Amps] AL 1500 P.O. Meter Function (score: 1): Author: "MICHAEL HUGHES" <mhughes149@verizon.net>; Date: Sun, 04 Oct 2009 21:49:52 -0400; I need some help. Upon receipt of my new AL 1500 I noticed that the Multi Meter P.O. "Power Output" function indicated 1,100 watts output on 40 meters and similar low output readings on 15 meters. In; /archives//html/Amps/2009-10/msg00069.html (8,799 bytes)
2. Re: [Amps] AL 1500 P.O. Meter Function (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 04 Oct 2009 22:12:50 -0400; If you have a reactive load the power readings and the power will be different. In cases like these it's best to check out the amp with a dummy load. Check out the antenna(s) with a good bridge. If t; /archives//html/Amps/2009-10/msg00072.html (10,737 bytes)
3. Re: [Amps] AL 1500 P.O. Meter Function (score: 1): Author: "Dave Hachadorian" <K6LL@ARRL.net>; Date: Sun, 04 Oct 2009 19:33:06 -0800; I own an Al-1500, and my buddy W7WW has two of them. We have found that the wattmeter is extremely sensitive to variations in swr or load impedance. It's a great amp though. Dave Hachadorian, K6LL Yu; /archives//html/Amps/2009-10/msg00075.html (10,610 bytes)
4. Re: [Amps] AL 1500 P.O. Meter Function (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Mon, 5 Oct 2009 00:26:35 -0400; Based on the schematic of the amplifier, the PO function is not a wattmeter but a simple capacitive voltage divider and rectifier on the RF output. A circuit like that has no directivity and is easil; /archives//html/Amps/2009-10/msg00076.html (12,231 bytes)
5. Re: [Amps] AL 1500 P.O. Meter Function (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sun, 04 Oct 2009 23:11:45 -0600; Joe, You are correct about trying to measure power based on voltage but in your example an SWR of 2:1 is the same as a reflection coefficient (Rho) of 0.333 meaning that the voltage on the line will; /archives//html/Amps/2009-10/msg00079.html (8,651 bytes)
6. Re: [Amps] AL 1500 P.O. Meter Function (score: 1): Author: "Fern" <crc@cyberlink.ca>; Date: Sun, 4 Oct 2009 20:42:05 -0600; I would suggest that it would be better to check the accuracy of the wattmeter if the amp was fed directly into a dummy load. The Hy-Gain 18HT Hy-Tower vertical is not necessarily a good 50 ohm feed; /archives//html/Amps/2009-10/msg00090.html (12,158 bytes)

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