Searching \ for '[OT]: Internal Antenna ... Now VHF/UHF handheld pe' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=internal+antenna
Search entire site for: 'Internal Antenna ... Now VHF/UHF handheld pe'.

Exact match. Not showing close matches.
PICList Thread
'[OT]: Internal Antenna ... Now VHF/UHF handheld pe'
2001\08\29@213059 by Jim

flavicon
face
    "I'd give it greater than 50/50
    that the entire thing is a total
    sham"

I think this 'device', the so-called hidden antenna
is particularly effect beings the advert shows it
installed on the back of the phone with the battery
removed - install the battery and it truly *is* a
'hidden antenna'. What does the mass of that
batt pack do when it is installed over the 'hidden
antenna' - and what effect does that have on the
performance promises of the 'hidden antenna'?

What the average person (and average piclister
as well) does not realize is that *real* performance
could be had by going with an 'elevated' feed style
antenna - something with some well-known radiation
characteristics even compared with the usual end-fed
half-wave or the helically shortened 'stubby' style that
is now so prevelant.

... and all for the cost of around what these 'hucksters' are
asking for a piece of sticky-backed aluminum tape - the
same kind of aluminum tape *we* used to use to wrap
RF connections for the purpose of  improving 'shielding' ...


VHF/UHF Handheld 2-way Transceiver Performance - a primer

The poorest performance is seen in hand-held gear at
50 MHz/6 Meters (and below) where a quarter wavelength \
is 4 feet  11 inches. On this band it's best to grasp the talkie
tightly (becoming part of the 'ground' or conterpoise
system) - and preferably using a telescopic whip as opposed
to the supplied 12" helically wound 'rubber duck' style
antenna. Operation from within a vehicle is almost impossible
due to the 'waveguide beyond cutoff effect' due to the
structure of the vehicle. Experiments with an Azden AZ-61
over a number of years and with several low-band VHF
repeaters are the basis for this evaluation.

At 146 MHz/2 Meters things improve. A quarter-wavelength
is now only about 19 inches - tightly grasping the HT's body
*still* improves the signal into the repeater when marginal into
"the machine" (the repeater). A telescopic whip, about 19" at
this frequency, will still outperform a a 6 or 8" rubber duck
antenna. Operation from within a vehicle shows definite
signs of signal attenuation (waveguide beyond cutoff effect still in
play).

At 440 MHz/ 70 centimeters - the situation is such that the
radio supplies most of it's own ground/counterpoise. A
quarter-wave antenna is now only 6". No need to 'squeeze'
the HT and tightly couple ones body into the antenna
system. At this freq regarding operation within a
vehicle - the 'waveguide beyond cutoff effect' is about
nil ...

At 850 MHz cellular - same conditions for 440 MHz
apply. Antenna lengths are about 3" for a quarter wave -
and can easily be shortened (made stubby) by 'helical
winding' the active element ... body of 'radio' supplies
ground plane/counterpoise. Operation within from vehicle
very favorable.

1296 MHz/23 cm upward - all that applies to 440 MHz and
above applies. The 'Rayleigh fading' is now most pronounced,
however - move back and forth a foot and hear many 'fades'
on a weak signal ...

Jim




{Original Message removed}

2001\08\29@220653 by Dan Larson

flavicon
face
On Wed, 29 Aug 2001 20:31:36 -0500, Jim wrote:

>     "I'd give it greater than 50/50
>     that the entire thing is a total
>     sham"
>

The TV ad that I have been seing attempts to make you feel that
you are getting the deal of a life time by offering the "Wave Scrambler"
as a free bonus. It claims to deflect "Harnful Radiation" away from your
head..

ROTFLMAO!

$20 for a set of ($50 value!) aluminzed stickers. Sounds like a good deal
to me! (Yea, right!...).

I think I'll stick with good 'ol coat hangers and aluminum foil!

Dan

--
http://www.piclist.com hint: To leave the PICList
spam_OUTpiclist-unsubscribe-requestTakeThisOuTspammitvma.mit.edu


2001\08\30@041112 by Dan Michaels

flavicon
face
At 09:12 PM 8/29/01 -0600, you wrote:
{Quote hidden}

BTW, Jinx sells football [american version] helmets on his
website that are lined with aluminium foil, and trail a long
wire that hooks to the bottom of your shoe for grounding.

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


2001\08\30@041646 by Graeme Zimmer

flavicon
face
> BTW, Jinx sells football [american version] helmets on his
> website that are lined with aluminium foil, and trail a long
> wire that hooks to the bottom of your shoe for grounding.

A URL please.

I need one, I need one !!!!

...................... Zim

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads


More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...