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Re: [Amps] Advanced Power Technologies ARF1505

To: amps@contesting.com
Subject: Re: [Amps] Advanced Power Technologies ARF1505
From: Steve Thompson <g8gsq@eltac.co.uk>
Date: Thu, 06 Jul 2006 13:52:14 +0100
List-post: <mailto:amps@contesting.com>

mike kendall wrote:
> With a gain of approximately 16dB, it could have about 67 watts going into a 
> shunting resistor and still get 1KW out of a pair with a 100 watt 
> transceiver.  I think this is similiar to the way they do it on the the 
> Ameritron ALS-600 by looking at the size of the input resistor on that amp.  
> The 5400pF is a rating at 1mhz.  Further down the spec sheet they have input 
> impedances for 2,13.5, 27, 40 mhz and they look to be substantially different 
> with ratings that are shunted by a 25ohm input resistor.  I am calling the 
> company tonight for more information as they do advertise it for broadband HF 
> amplifiers on the news release from a few years ago.
>   73,
>   Mike
The 5400pF is measured at 1MHz, but it's not going to change that much 
at other frequencies, and at the upper end of hf Zi looks like a half 
decent short circuit. Maybe matching at the top end and then frequency 
tailoring an input attenuator will work. Given the Zl figures to get the 
750W output, I expect a heck of a lot will be sacrificed to achieve much 
bandwidth - but a joy to fire up on topband by the looks of it!

Steve
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