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what changes When you adjust the stinger on a mobile antenna ?
inductance
reactance
capacitance
resonance
impedance
resistance
State:  Country:  Radio Setup: mudduckjunkinthatrunk DX #: 338 MD #: 210 |
What's Happening
what changes When you adjust the stinger on a mobile antenna ?
I think you can only make one selection but theres more then one answer.
State:  Country: Radio Setup: One that fucks the ducks in the ass DX #: 141 MD #: 1152 |
You can chose more than one
29 Black Chrome RFX75-afied w/D104M6B - Stresstest built and tuned
Straight 4 pill - Gator Built
Straight 16 pill - Gator Built
Fatgirl Puck
55r4 Terry Built
I approve my post.
State:  Country: Radio Setup: Something that can cut your lips off DX #: 38 MD #: 117 |
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this is a good post for sure.
CB Stands for the Cool Breeze Radio network.
And somebody somewhere is standing by.
2010 8 and 16 pill National Champ
No Name amps and 55 antennas
State:  Country: Radio Setup: 1 watt mudduck killing jewniden68 and a funker box DX #: 737 MD #: 189 |
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so when do we get the answer?..lol..
State:  Country: Radio Setup: Bull-it Built Equipment DX #: 127 MD #: 121 |
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reactance - (reactance is the resistance in a AC circuit, it can be purely resistive or purely capacitive, or a little of both, hence why i did not answer resistance or capacitance)
resonance - length changes the resonant frequency of the antenna
impedance - yes the feedpoint impedance can and does change based on some or all of the factors above
inductance is an iffy one... based on adjusting the whip you should not affect the coil therefore you are not changing the inductance of the coil itself, there can be an instance where you might be adjusting the coil itself then this would be true
President, Maryland Chapter of the Coolbreeze Radio Network
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State: Country: Radio Setup: mudduckjunkinthatrunk DX #: 338 MD #: 210 |
capacitance will change with stinger length
or so says my Fluke
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State: Country: Radio Setup: Something that can cut your lips off DX #: 38 MD #: 117 |
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resonance and impedance are what changes, the mfj uses capacitance to make the calculation to get the x reading.
CB Stands for the Cool Breeze Radio network.
And somebody somewhere is standing by.
2010 8 and 16 pill National Champ
No Name amps and 55 antennas
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State: Country: Radio Setup: Magnum S-6, Stroker Boxes, 55 Antennas DX #: 509 MD #: 1 |
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Doesn't the reactance change as well??
"If you ain't Strokin', you ain't smokin'!"The Coolbreeze Radio Network is in control.
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State: Country: Radio Setup: Something that can cut your lips off DX #: 38 MD #: 117 |
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inductance doesn't change since the coil is a fixed item. reactance would change, But some changes are due to the overall picture rather then just the stinger being moved.
CB Stands for the Cool Breeze Radio network.
And somebody somewhere is standing by.
2010 8 and 16 pill National Champ
No Name amps and 55 antennas
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State: Country: Radio Setup: mudduckjunkinthatrunk DX #: 338 MD #: 210 |
well I'm no expert by any means
But I do know that if you measure capacitance at the feed point you will get different reading with different stinger lengths
i guess this is why stinger lenght will affect MFJ's X reading
yes and resistanceOriginally Posted by 10 Gauge
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State: Country: Radio Setup: Bull-it Built Equipment DX #: 127 MD #: 121 |
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read my post...REACTANCE is a COMBINATION of RESISTANCE and CAPACITANCE, it can be completely one or the other....resistance and capacitance in this case are a "trick question"(for lack of a better term) so to speak since reactance was added as a choice
President, Maryland Chapter of the Coolbreeze Radio Network
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State: Country: Radio Setup: Bull-it Built Equipment DX #: 127 MD #: 121 |
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what model fluke...if it is reading using DC, it it basically useless in this application
I'm NOT saying it is giving an incorrect reading...i'm saying RF and DC are two completely different animals when it comes to how Capicitance and Resistance affects them
President, Maryland Chapter of the Coolbreeze Radio Network
great thread
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State: Country: Radio Setup: mudduckjunkinthatrunk DX #: 338 MD #: 210 |
the meter is model 179 ..I think
i have used it to see the range of vacuum , ceramic and air variable capacitors.
pretty useful if your playing around with gamma matches
Skilled Mauldropper
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State: Country: Radio Setup: Castoff junk from mic to antenna. MD #: 901 |
Every one of those items change. Some by only very tiny amounts.
The inductance will change. Even a straight piece of copper pipe has inductance. Look at a UHF tank circuit.
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State: Country: Radio Setup: Something that can cut your lips off DX #: 38 MD #: 117 |
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a 179 fluke doesn't go low enough to measure anything less then 1uf with accuracy, if it even read it.
CB Stands for the Cool Breeze Radio network.
And somebody somewhere is standing by.
2010 8 and 16 pill National Champ
No Name amps and 55 antennas
Isn't it obvious? The stingers' length changes
{thought I'd insert some dry humor into this seemingly endless thread}
Apprentice Mauldropper
State:  Country:  MD #: 514 |
im with HiDef, all the above change
CO-INDUCTIVE coinduction is a technique for defining and proving properties of systems of concurrent interacting objects
As a definition or specification, coinduction describes how an object may be "observed", "broken down" or "destructed" into simpler objects.
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