Do you have the auto tuners switched out in both rigs? The Yaesu has a
higher SWR than the Icom so perhaps you have the tuner still in line.
Mike B.
-----Original Message-----
From: Kevin Polchan <kpevin@mediaone.net>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Tuesday, January 25, 2000 7:58 AM
Subject: [AMPS] Input power question
>
>Hi All,
>
>Just a quick question after experimenting with a couple radios here the
last
>couple days. I have an AL-800H amp (two 3cx800a7) and 2 different
exciters,
>an FT-990 and an IC-756. I am curious why it takes 80watts from the Yaesu
>and only 55 watts from the Icom to drive to a 1500 watt carrier. I have
put
>a wattmeter between the radio and amp and the amp and antenna. I assume
its
>some kind of impedence thing, perhaps from the finals of the radio. Both
>radios at 100watts out will drive the amp to the same output.
>
>I am not that concerned about it, even though the amp is rated at legal
>limit for 55W of drive, 25 watts seems like quite a large difference to
>achieve the same output. The input SWR is < 1.5:1, but the Icom shows
>1.19:1 and the Yaesu shows 1.46:1.
>
>Any comments?
>
>Thanks and 73,
>Kevin
>KB9UPV
>
>
>
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>
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