Revelation6v8: The SWR is the Voltage Standing Wave Ratio or VSWR. When it is 1 which is
the max that means all of the RF energy is exiting the radio and or
antenna. The cable itself should have the correct impedance of 50 ohms. The
Antenna impedance depends on the surrounding placement of the conductors.
Hence if you tune the antenna like the firstick does this is the proper way
to match the antenna to 50 ohms for max power transmit and receive. For 50
ohms you need zero current and max voltage at ant. tip
M28443: The firestick that you mention is one of the antennas I use too when I can
get a ground; and it does perform very well and thanks for your input ! The
NGP is a compromise but, it does beat NOT having a CB for those trips ! I
carry a WILSON 3 ft NGP kit on a CLAW mount if I have to drive one of the
trucks that has the mirrors that don't ground .
funnyman1972: slide to tune is just cheating your swr...what matters is what is at the
end of your antenna...but willson does make some good antennas.
dabigpornstar69: Wilsons stink. The shaft need to be more slender and the fiber glass is
much to brittle.
M28443: @Revelation6v8 YES sir I concur COMPLETELY ! If you have a good ground a
standard ground plane antenna will be MUCH better than the NGP for sure .
Some of these trucks coming out now do not have any "groundable " metal on
the mirror brackets , which is about the only location for an antenna . I
slipseat ALOT , meaning I drive different trucks daily sometimes changing
trucks at my turnaround point and returning .
bluejay148: hi do they still make thoses antennas wit hthe slide and tune
Revelation6v8: See my comment below: By using the trombone inside the cab creates an RF
Match but also capacitive rotates the impedance to create a loss. The
system is matched at the expense of transmit and Receive loss. It is best
to match the antenna by adjusting its' length to match the dipole resonance
condition like the fire stick does. The condition for match is zero current
at the tip and RF Voltage MAX. This gets VSWR 1 which is critically matched
max power TX/RX
M28443: @Revelation6v8 Are you talking about the Firestick NGP antenna OR the
regular Firestick antenna ? This Wilson NGP is primarily made for those
installs that do not have a proper ground plane . IMO if you do have an
acceptable ground plane a "regular " ground plane type antenna will perform
Revelation6v8: @M28443 Hello. I have the firestick with the tunable screw on top which
allows me to tune the resonance of the antenna which is the real trick. The
trombone just hide the mismatch under the rug by rotating the complex
impedance to minimize the reflection which is VSWR. This introduces an RF
loss in the transmission line between the antenna and TX/RX. Which
increases your Noise Figure. Yes the Wilson is more convenient but you
suffer a NF degradation which is fine if you do not want max perf.