HOW TO CALCULATE THE CABLE LENGTH
cable length =
(300/frek) x velocity x coax odd multiples
instance =
freq at 100 Mhz pake rg 58 cable provided 14 meter cable
(300/100) x 0.66 x 5 = 9.9 when it is too long cut it
(300/100) x 0.66 x 7 = 13.86 ... at near 14 feet
* Example of table velocity.
Make a jumper cable with RG58 at 100MHz frequency so
(300/100) / 2 * 0.66 = 99cm
** if this velocity is also used to determine the length of the antenna?
example we want to make the antenna 1/4 lamda at 100MHz and the transmission line cable rg 58 then
(300/100) / 4 * 0.66 = 0,495 cm
((300 divided by frequency) / 2 * velocity) JUPER SWR
To match coax jamming transmitter can also do:
a. Prepare a 5watt transmitter only
b. Jumper cables that have been measured at the desiredfrequency. Well this jumper has a message to the SWR analyzer
c. End of the jumper into the transmitter and another end to theSWR.
d. output SWR T conector and cover with one end of the connectorcover with dumyload T TSB without jumper
e. To the end of yet another T connector and transmission cableinput ends dip a little low SWR sd
Please try
For the jumper can still use the formula
Eg use RG8 the middle fibers of the (((300/100) / 2) * .66) = 99cm
In theory a long jumper coax to the 1/2 lamda X velocity, such asRG8 middle fibers, the frequency of 100MHz (((300/100) / 2 * .66)when multiplied by the result 99cm 29.70m 30 then generates, but in reality may be more or less than 29.7M
could be 29.55m or 29.80m, considering they will not necessarilyflat coax impedance of the tip up to the end.
The formula can be applicable to all types of coax, antennaantennae up whatever does not matter.
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