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Title: VLF Power Meter Post by: wb1aij on January 05, 2007, 05:21:15 PM Does anyone here know of any R.F. power meters that will read forward & reflected power or have schematics for one?
Title: Re: VLF Power Meter Post by: WA1GFZ on January 05, 2007, 09:18:30 PM What operating Z?
If 50 ohms it should be easy. Just use higher Ui core material for the current transformer. I would think type 77 or 73 or maybe even higher for 137 KHz. I used type 61 (Ui=125) in my HF watt meter. Title: Re: VLF Power Meter Post by: wb1aij on January 07, 2007, 06:38:30 PM What operating Z? If 50 ohms it should be easy. Just use higher Ui core material for the current transformer. I would think type 77 or 73 or maybe even higher for 137 KHz. I used type 61 (Ui=125) in my HF watt meter. Thanks for the info... The Z is going to be 50 ohms & the frequency will be 150-200 khz. This is an industrial application and will not be transmitted into the "ether" The xformer sounds like a good place to build around on a breadboard rather than modifying an existing unit for H.F. Title: Re: VLF Power Meter Post by: WA1GFZ on January 07, 2007, 08:33:53 PM Bob,
I just sent you a PM check it out. I think I can help. Title: Re: VLF Power Meter Post by: WA1GFZ on January 10, 2007, 08:43:59 AM AM Forum a good way to connect hams working on the same project AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
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