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Old March 12th 04, 06:03 PM
N2EY
 
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Uwe wrote in message ...
So a 50 resistor serves as my dummy load and a meter connected to
the dummy load indicates around 10 volts RMS. If I did my homework that
would indicate around 2 watt output.


E squared over R, yes, two watts is about right.

All this at B+ of 200v and an anode
current of about 35mA (I am running the transmitter off an adjustable bench
tube power supply at this point).


Seven watts input, two watts output is a bit low. How are you
adjusting the controls?

Does all this compare with the numbers you get with your transmitter??
I will need to build a power supply for the final version and would be
interested to know what you use for B+. In order to get 5 Watts I would have
to crank up the B+ quite a bit.


IIRC that design called for 300 or 350 volts B+, which would work out
to 15 watts or so input. The output network is not optimized for 200
volts B+, and in addition the efficieny is better with more plate
voltage.

Actually I don't care at this point since I am still practicing for my code
exam, so I can't even use the transmitter right now.


What study methods are you using?

How do you monitor your transmitting tone with a device like this.


Several ways:

1) Connect an audio oscillator to the key so that both it and the
transmitter are keyed at the same time. This can be a bit tricky
because the two circuits must not interact.

2) Listen to the transmitted signal on your receiver when
transmitting. This requires that you have a way of reducing the
receiver gain while transmitting, but not completely silencing the
receiver. What sort of receiver do you have to go with the
transmitter?

73 de Jim, N2EY


 
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