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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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