[Amps] Advanced Power Technologies ARF1505

[Steve Thompson]

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