Re: Extend Range

["petem" <petem001@xxxxxxxxx>]

if you don't have the matching coax for the line you will have a bad
signal..

if the transmitter was balanced to transmit on a 300 ohms line and you put a
75 or 50 ohms line you will in fact lessen the overall signal


"Rich" <Never@xxxxxxx> a écrit dans le message de news:
7PydnZBCEY8clc7eRVn-oQ@xxxxxxxxxxxxxx
>I could run a piece of coax 20 ft to the edge of the room shorting up the
> transmitting distance.
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> "alarman" <alarman2000@xxxxxxxxx> wrote in message
> news:rpD4f.77592$lq6.23052@xxxxxxxxxxxxx
>>
>> "bdolph" <bdolph@xxxxxxxxxxx> wrote in message
>> news:U7D4f.2468$4O1.2194@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>> > Many years ago I used to make a dipole to extend the range of these
>> > transmitters.  I could get them to transmit across a street to another
>> > house.  It must be the correct dimensions and trimmed to the
>> > transmitters frequency.   Somebody as linear may have the dimensions to
>> > build this.  Let us know if you find them.
>>
>> wavelength in meters = 300 / frequency in MHz
>>
>> A 433 MHz transmitter has a wavelength of .6928406 meters, or 27.270206
>> inches. You HAM guys can check my math, but
>> theoretically, you could make a quarter-wave antenna of approx. 6.82
> inches.
>>
>> js
>>
>>
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