Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Wattmeter Location
Hi,
I am contemplating a pep reading wattmeter so I can check the output of my HB amplifier. Consequently, I am putting it right on the output of the amp. The output of the amp should always see 50 ohms because it will be feeding either a 50 ohm dummy load, or an ATU tuned to 50 ohms. With that in mind, I am simply using a resistive voltage divider, to get a voltage sample, and squaring it with an AD633 multiplier. This seems like a simple, cheap way to get watt info. assuming you will always be working into a near 50 ohm resistive load. Anyone see any reason why this will not give you a pretty good indication of your power output? I realize that the load may not always be exactly 50 ohms, and that there are losses in the ATU. The reason I have not tried getting a current sample and using the conventional VI COS Theta with the multiplier is due to the additional complexity of circuitry. It is also difficult to get accurate current samples over a wide frequency range. By making everything resistive it somewhat takes the frequency dependency out of the problem. Thanks. 73 Gary N4AST |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Preferred antenna location | Antenna | |||
Good HF Antenna and Location on Semi? | Antenna | |||
Recommend a Used Bird Wattmeter 50-150 MHz? | Antenna | |||
Bird wattmeter | Antenna |