[TowerTalk] (no subject)

[RLVZ at aol.com]

Hi Guys,

 
Hope you can give provide some wisdom on an antenna problem  I'm having on 
40-meters. I'm operating at a temporary QTH and mounted a Hustler  5BTV 
vertical up on the rooftop at 30' above ground. Using two 1/4 wave radials  for 
40-m. and four 1/4 wave radials for 20m. the SWR across 40-m. was 1.3 to 1.5 
 to 1. The antenna radiated pretty well for what it is. ( a simple  GP)

 
Since I'll be at this QTH for another month and I'd like to  work 
12-17-30m. I took the Hustler 5BTV down today and replaced it with a Big  SteppIR 
vertical. Using the same radials at with the Hustler... my SWR on 40-m. is now 
a terrible 5 to 1 and it doesn't hear well either.  I'd say the reception is 
down about 4 S-units.

 
On 10-30 meters the Big SteppIR Vertical is resonating aprx. 2  Mhz from 
the norm:

 
Transmit Freg SteppIR Resonance

28mhz 24mhz
21mhz 18mhz
14mhz 12.5mhz
10mhz 8mhz
7mhz ? (unfortunately I cannot add add'l length on 40-m. to  find resonance 
but the SWR is 5 to 1)

 
Since I can vary the antenna length I can make the SteppIR  work on 10-30 
meters. But I'm wondering what I can do to make it work on  40-meters? The 
SteppIR instructions say you can adjust a ground planes resonance  by changing 
the radial length. I'm wondering if you think increasing the length  of the 
40-meter radials would lower the SWR on 40-m?

 
I'd appreciate ideas on how to reduce the SWR and increase the  antennas 
efficiency on 40-m. Such as: adding more radials to the GP or  increasing the 
radial length, etc.

 
Thanks & 73,

 
Dick K9OM/9