cell phone antenna question
 

When using one of those external, mag-mount antennas that plug into
the antenna jack just below the stubby antenna of a flip phone, it is
better to remove the stubby antenna?

On receive, I would think it makes little difference. On transmit,
however, if the stubby antenna is not removed, won't energy be wasted
on in-vehichle propagation that would be better directed to the mag
mount on the roof?

Ken KC2JDY

Ken
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On Sat, 03 Apr 2004 11:23:46 GMT, Ken wrote:

When using one of those external, mag-mount antennas that plug into
the antenna jack just below the stubby antenna of a flip phone, it is
better to remove the stubby antenna?

On receive, I would think it makes little difference. On transmit,
however, if the stubby antenna is not removed, won't energy be wasted
on in-vehichle propagation that would be better directed to the mag
mount on the roof?

Ken KC2JDY

Hi Ken,

Do you have the option to removing it? If so, goferit.

If not, then the jack must disconnect it when you insert your external
antenna (VCR/DVD products have such switching jacks that look no
different than conventional RCA bulkhead connections). If this option
does not exist, then the manufacturer must consider their paralleling
of having no negative consequence in efficiency (which is recovered
and supplemented in the better external antenna situation). However,
this last is simply a guess that can be borne out only through your
experience.

73's
Richard Clark, KB7QHC

we did testing on antennas inside and on top of car, about 6 dB difference
(better outside)
for Both TX/RX. with same antenna as on cell

problem is stubby not removable, something seems mismatched,

but on many cell phones the ground is really just some of the metal parts
inside, no good "ground" at all
so the antenna is only part of the radiating area, the cell phone and your
arm the rest of the antenna.

Which means it may be hard (with a cellphone) to get RF into/outof a coax to
an outside antenna, unless it has a real connector (most do not, cost too
much, no need for it)



"Ken" wrote in message
...
When using one of those external, mag-mount antennas that plug into
the antenna jack just below the stubby antenna of a flip phone, it is
better to remove the stubby antenna?

On receive, I would think it makes little difference. On transmit,
however, if the stubby antenna is not removed, won't energy be wasted
on in-vehichle propagation that would be better directed to the mag
mount on the roof?

Ken KC2JDY

Ken
(to reply via email
remove "zz" from address)