as everyone here probably already knows, i play with FCC legal low power broadcasting (if you can call it that at these very low power levels) under 15.219.
well i am looking for schematics for a low power (milliWatt range TPO) antenna analyzer.
i need it to simultaneously measure impedance and VSWR.
basically i am looking to build an X-Band specific low power (mW Range) MFJ type antenna analyzer
these i know are not commercially available and will need to be custom built.
either one with it's own signal generator or one meant to be driven by a low power 50 ohm transmitter into an antenna system.
i am dealing with 100mW to final RF stage (probably about 60mW TPO) transmitter levels
i want to experiment with different 3m (top load, center load, EH, Isotron, capacity hats, etc) antenna designs and see what performs best for different installation scenarios.
i'm sure there is a basic design out there i can modify for my purposes.
thanks
Robert In Denver
Though not a complete plug and play package here's a link to a description of what I use to analyse my antenna:
http://www.part15.us/forum/part15-forums/general-discussion/rf-current-transformer-antenna-tuning
If you have a two channel scope this is worth a try, I have tried a white noise impedance bridge for several antennas and was never very confident in the measurements but with this transformer all the readings check out using known circuit elements for simulation.
Neil
ebay a chinese one. theyre wicked affordable for the 1-60 mhz ones