Thanks for the response Miro. I came across Don Jackson's article after I posted my remarks. A similar well thought out design for a high power rf sampler can be found in the May 2011 issue of QST on pages 52 and 53 in the Technical Correspondence section by Tom Thompson, W0IVJ.
The two couplers shown on Frank Dorenberg's page, N4SSP, that I previously posted probably would not work well at higher frequencies
because they neglected to include a faraday shield to prevent capacitive coupling to the?secondary winding and they also neglected to put a shunt?resistor on the secondary. I'd already seen the g3yhn.info pages.
It all depends on what your trying to do and what your trying to measure. As has been already mentioned, if you're just trying to measure relative levels and not absolute values you could just?use the tinySA antenna.
