[AMRadio] AM Radio

[rbethman]

Amen.

On 1/24/2012 3:05 PM, Bernie Doran wrote:
> It is not that simple. if the drive control controls the grid drive to the
> 6146s they will drop out of class c and not modulate properly. second if you
> are driving the linear too hard it will not be running as a linear
> regardless of what the ID states.
Retuning the Apache to achieve the CORRECT drive to the amp will set the 
entire final stage of the Apache W-A-Y out of kilter.

You'd end up rebuilding it.
> <SNIP>  
This next part is what is harmful to the Linear Amplifier.
>     Keep in mind that the tube plate dissipation
> will now be at least twice the carrier output and you must keep them cool at
> that level.   the power supply also may not be able to handle that load
> under long transmissions.     Regarding the transmitter, you may have to
> reduce the screen voltage to keep the drive in the propper range.
True!

> the quickest method would be to build a resistave pad to suck up the  extra
> power prior to getting to the amp.        Again, it is simply not worth the
> effort for less than 6 DB.    now if you must have a big amp. I have a Henry
> 5k to sell you, it will do 1 KW carrier on AM and near 5,000 on cw.  I do
> not even use anymore.  Bernie [
An attenuator between the transmitter to load the transmitter down to 
present about 20W to a legal limit amp is one way.

If you are insistent on getting a full legal limit station, talk to some 
more folks.  It REALLY is not an out of the box solution to get where 
you have decided to go, considering where you are starting.

Bob - N0DGN