[Antennas] Re: DBJ-1 J-pole from Feb QST mag

[Judy May]

Thanks for the response, Tim.  I see you don't make use of his
unusual "Schedule 200" PVC pipe, which was one problem I encountered. :)

    But let me ask about your statement: "As the author said, SWR isn't
great on 440, but it's resonant, ... ".  Without obtaining a low SWR
reading, how do you know your antenna is resonant on the 440 band?  Is
it just a matter of getting improved performance over a stock rubber
duck?

    I understand that the SWR reading is just part of the big picture,
but I felt that without any other adverse conditions to hinder the
antenna, if I could not get the SWR down below 2.0:1 it would indicate
to me that the antenna was NOT resonant on the 440 band.  That is what I
experienced both when building my DBJ-1 and testing the author-built
version.  My tests were conducted outdoors, 20 feet high, with no metal
in the vicinity.  I had a coax coil, as you mentioned.

      --- Judy    KG4QHC


Tim Conway, n9hmg wrote:
>
> I ... built 2.  ...
> As the author said, SWR isn't great on 440, 
> but it's resonant, and works
> well.  I've considered soldering a 17.5cm 
> stub to it to try for better
> match on 440, but that's just too much trouble.
>