Tuesday, November 17, 2020

Throw out the previous test ... 20m 1/4 Vert vs 20m Fan Dipole 24h WSPR

 The results of the previous test were inconsistent with what I was expecting.  Poking around I determined that the IFL was bad.    Its only a little over 100' but the RG214 has been buried for 20+ years and has been dug up and weed whacked a few times I am surprised it lasted that long.  

Replaced it with 40' of RG214 + 60' of smaller diameter hard line.   Probably less then a db loss across the HF spectrum ...more then acceptable. 

The results were more inline with what I was expecting.   The Vertical is just up behind the house with a tilted GP towards the W SW.  The Fan Dipole is at the top of the hill with  EU and AUS off the broad sides and nulls towards AS and somewhere mid S Atlantic.   The nulls off the end of the dipole are quite apparent and the low throw and tilted GP of the Vert stand out. 

The Fan is best towards EU and AU ,  the Vert is best towards AS.  The low throw of the Vert does give it a 360 degree DX advantage over the dipole.     Both antenna work very well and both have certain advantages  but overall we are talking a 3 db difference for the most part.  


Spots Map Green=both  Blue = Fan Dipole Red = Vertical 














Simultaneous Spots 









Top 10 DX Spots for each antenna ,  LDP Fan Dipole , IMI Vertical 




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