Definitely!
Any amplifier above the HF range is VERY dependent on layout and PCB design.
With the low input impedances present, it would be next to impossible to
design a good input matching network. Due to the relatively low
amplification factors, negative feedback is out of the question, so that
equalizing the impedance by that means is ruled out! What is left is passive
equalization on the input matching network. Please note that although I am
talking about the input- which is the more acute problem- the same applies
to the output circuit as well. All in all, a lot of experimenting is
required in order to generate a viable design and , even so, from a pair of
MRF 150 you can expect about 150 Watts at 50 MHz, if you want to retain a
reasonable linearity in the final product. Gains are at about the 12 dB
mark.
Alex 4Z5KS
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Mike Short
Sent: Friday, May 22, 2009 1:28 AM
To: amps@contesting.com
Subject: [Amps] EB-104 amp on 6M
The MRF-150's are spec'd to 150MHz. How stable would the amp be on 6M built
as is? Of course I will use a LPF.
Would the input and output matching transformers need to be tweaked?
Mike
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