In article
,
Bob Dixon wrote:

Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio.
This should affect the operation of the antenna adversely. Comments?

Bob


Adding an adapter to a Transmission Line will have no effect, except to
add insertion loss of the adapter. Adding an adapter to the antenna
itself MAY cause the antenna charactoristics to change. Most SMA and BNC
connecters are used in Transmission Lines, and not antennas themselves.
The OP doesn't really explain where the adapter is to be used. Most
small handheld devices with external antenna connections have those
connection in the Transmission Line and not in the antenna itself.

Me

"Bob Dixon" wrote in message
...
Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio.
This should affect the operation of the antenna adversely. Comments?

What makes you think the effect should be adverse? When you consider all
the different radios that a given antenna could be connected to, the change
from radio to radio is going to be far greater than what a 3/8" adapter is
going to do (consider its electrical length at 2m...). In fact, I would
hope that most HT antennas weren't meant to be used with counterpoises, but
now that I think about it, I don't really know whether or not that's the
case. Anyone?

I mean... the radiation pattern of a wire cut 'to length' stuck into a BNC
connector on the top of an HT is going to be very seriously distorted
relative to the same wire above a near-infinite ground plane.

Cell phones often use sleeve dispole antennas to avoid the need for a
counterpoise...

---Joel

"Bob Dixon" wrote in message
...
Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio.
This should affect the operation of the antenna adversely. Comments?

What makes you think the effect should be adverse? When you consider all
the different radios that a given antenna could be connected to, the change
from radio to radio is going to be far greater than what a 3/8" adapter is
going to do (consider its electrical length at 2m...). In fact, I would
hope that most HT antennas weren't meant to be used with counterpoises, but
now that I think about it, I don't really know whether or not that's the
case. Anyone?

I mean... the radiation pattern of a wire cut 'to length' stuck into a BNC
connector on the top of an HT is going to be very seriously distorted
relative to the same wire above a near-infinite ground plane.

Cell phones often use sleeve dispole antennas to avoid the need for a
counterpoise...

---Joel

samw thing without rubber 3.75 at any electroncs store

what a rip off


On 25 Nov 2004 16:22:40 -0800, (Stephen G.
Gulyas) wrote:

Do you have a need for a high-quality SMA-to-BNC rubber covered
factory look antenna adapter that is custom made to fit and protect
your H.T. or scanner radio?

Adapter allows you to:
Quickly change antennas to base, mobile or different style use.
Use the more popular and wider selection available of BNC antennas.
Prevent chassis connector wear or from coming loose due to antenna
changes.

Adapter features:
Gold plated contacts with a teflon insulator.
A low profile design with a rubber covering for a factory antenna
look.
The rubber base seals to the top of the radio with no spacers needed
for moisture and dirt protection.
The base also provides an excellent support for any length of antenna
or application.
No need to remove adapter once installed to make a quick and safe
BNC style antenna change.

Sizes to fit radio models:
Yaesu: VX-5R, VX-7R, VX-2R, VX-1R, FT-50-R, FT-60-R, VX-10, VX-150,
VX-110, VXA-100, VXA-120, VX-800, VXA-700
Icom: IC-T90A, IC-R5, IC-R2, IC-T8A, IC-T81A, IC-Q7A, IC-M1V
Kenwood: TH-D7, TH-G71, TH-F6A, TH-59, TH-K2AT
Alinco: DJ-V5, DJ-X3, DJ-S40
Midland : G-11
Maycom : AR108
Standard: C508A, C510, HX-460S
Uniden : Atlantis(marine)
Tate Orca : Excel
Radio Shack: HTX-200, HTX-400, HTX-245, HTX-420

Previewed in the May 2000 Issue of CQ Magazine, and the Nov. 2000
Issue of QST Magazine.

$11.95 ea. + $1.50 S+H(One to unlimited)
(Check or money order only in U.S.Funds)
(Specify-radio-model)

STEPHEN G.GULYAS
706 LALOR ST.
TRENTON, N.J. 08610
U.S.A.

A photo of the adapter is available upon request.

I welcome any questions or comments at my email:


Thanks for looking at my posting.
S.G.G. KC2BHO 73's

samw thing without rubber 3.75 at any electroncs store

what a rip off


On 25 Nov 2004 16:22:40 -0800, (Stephen G.
Gulyas) wrote:

Do you have a need for a high-quality SMA-to-BNC rubber covered
factory look antenna adapter that is custom made to fit and protect
your H.T. or scanner radio?

Adapter allows you to:
Quickly change antennas to base, mobile or different style use.
Use the more popular and wider selection available of BNC antennas.
Prevent chassis connector wear or from coming loose due to antenna
changes.

Adapter features:
Gold plated contacts with a teflon insulator.
A low profile design with a rubber covering for a factory antenna
look.
The rubber base seals to the top of the radio with no spacers needed
for moisture and dirt protection.
The base also provides an excellent support for any length of antenna
or application.
No need to remove adapter once installed to make a quick and safe
BNC style antenna change.

Sizes to fit radio models:
Yaesu: VX-5R, VX-7R, VX-2R, VX-1R, FT-50-R, FT-60-R, VX-10, VX-150,
VX-110, VXA-100, VXA-120, VX-800, VXA-700
Icom: IC-T90A, IC-R5, IC-R2, IC-T8A, IC-T81A, IC-Q7A, IC-M1V
Kenwood: TH-D7, TH-G71, TH-F6A, TH-59, TH-K2AT
Alinco: DJ-V5, DJ-X3, DJ-S40
Midland : G-11
Maycom : AR108
Standard: C508A, C510, HX-460S
Uniden : Atlantis(marine)
Tate Orca : Excel
Radio Shack: HTX-200, HTX-400, HTX-245, HTX-420

Previewed in the May 2000 Issue of CQ Magazine, and the Nov. 2000
Issue of QST Magazine.

$11.95 ea. + $1.50 S+H(One to unlimited)
(Check or money order only in U.S.Funds)
(Specify-radio-model)

STEPHEN G.GULYAS
706 LALOR ST.
TRENTON, N.J. 08610
U.S.A.

A photo of the adapter is available upon request.

I welcome any questions or comments at my email:


Thanks for looking at my posting.
S.G.G. KC2BHO 73's

Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio.
This should affect the operation of the antenna adversely. Comments?

Bob





In article ,
(Stephen G. Gulyas) wrote:

Do you have a need for a high-quality SMA-to-BNC rubber covered
factory look antenna adapter that is custom made to fit and protect
your H.T. or scanner radio?

Adapter allows you to:
Quickly change antennas to base, mobile or different style use.
Use the more popular and wider selection available of BNC antennas.
Prevent chassis connector wear or from coming loose due to antenna
changes.

Adapter features:
Gold plated contacts with a teflon insulator.
A low profile design with a rubber covering for a factory antenna
look.

Adding any adaptor would seem to significantly move the radiating
portion of the antenna further away from the "ground plane" of the radio.
This should affect the operation of the antenna adversely. Comments?

Bob





In article ,
(Stephen G. Gulyas) wrote:

Do you have a need for a high-quality SMA-to-BNC rubber covered
factory look antenna adapter that is custom made to fit and protect
your H.T. or scanner radio?

Adapter allows you to:
Quickly change antennas to base, mobile or different style use.
Use the more popular and wider selection available of BNC antennas.
Prevent chassis connector wear or from coming loose due to antenna
changes.

Adapter features:
Gold plated contacts with a teflon insulator.
A low profile design with a rubber covering for a factory antenna
look.