[TowerTalk] R7000 Trap Resonant Frequencies

[John Tait]

Hi Mike..
                 I think that's normal... The traps have a chunk of 
aluminium tubing at each end, which loads the trap so you read a much 
lower frequency. What I did with my R7, was to take a note of the trap 
frequencies when the antenna was working perfectly. This allowed me to 
retune a faulty trap to it's former state if repairs were neccessary. 
See the bottom of my page at  http://www.qsl.net/ei7ba/r7_vertical.htm
  You'll see from the list that my R7 traps measured very low, like your 
R7000 traps.
              Vy 73 and good luck
                      John EI7BA

Michael Tope wrote:
> Does anyone know offhand what the factory set resonant frequencies 
> should be (as measured on a Grid Dip meter) for the various traps in the 
> Cushcraft R7000 vertical ?
>
> I just measured the 20 and 30 meter trap resonance from an old R7000 CT3 
> trap assembly and both resonances are significantly below the band (20 
> meter resonance is something like 13.6 MHz).
>
> Thanks,
>
> Mike W4EF..........