[1000mp] MPV Driving Amp

[Garry Shapiro]

Which Alpha are you talking about? It would have to be one with a Russian
tetrode, grid-driven. My 87A---grounded grid triodes with an input
network--- is most certainly not 50 ohms.

Garry, NI6T

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net
[mailto:1000mp-bounces at mailman.qth.net]On Behalf Of J. C. Mc Laughlin
Sent: Monday, October 23, 2006 3:55 PM
To: farson at shaw.ca; All about Yaesu 1000mp
Subject: Re: [1000mp] MPV Driving Amp


Dear Group:   It is also true that the impedance of the input of an Alpha
amplifier is about 50 ohms.  The signal that goes into the amplifier goes to
a resistor.  Still, one needs less than 100 w to drive the amplifier to full
output.

    73    Mac   N8TT
J.  Mc Laughlin;   Michigan  U.S.A.
Home:  JCM at Power-Net.Net
----- Original Message -----
From: "Adam Farson" <farson at shaw.ca>
To: "'All about Yaesu 1000mp'" <1000mp at mailman.qth.net>
Sent: Monday, October 23, 2006 12:55 AM
Subject: RE: [1000mp] MPV Driving Amp


> Hi Win,
>
> Well, I opted out of the whole debate by installing a Quadra. Its Zin is
50
> ohms resistive, in the range 1.8 ~ 54 MHz. The exciter's ATU is always
> switched out.
>
> The amplifier's ATU makes a fairly decent receive preselector.
>
> http://www.ab4oj.com/atu/presel/main.html
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>

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