Well the seller replaced these iffy diodes,this was to build a swr sensor cct(see pdf),i tried 1n5711 diodes but found the return meter insensative,the new diodes now read about 0.3v diode drop,these are the oa91 diodes,the best i can get is two of them have a vf of 0.317v,will they work better than unmatched 1n5711 diodes,i have only matched the vf as i dont have a curve tracer,thanks in advance.also this is for hf 3.5-30 Mhz ok.