| Author |
Message |
    
Jameslarson
Intermediate Member
Username: Jameslarson
Post Number: 115
Registered: 4-2006
| | Posted on Friday, May 12, 2006 - 4:03 pm: | 
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Hi. It is the Workman #BS1HAM
Ham Dipole 12' RG58AU Coax and PL-259 on Each End
Freq Range 20M, 17M, 15M, 12M, 11M, 10M, 2M, 220, 440, and came with no instructions. How do i mount this or put it together? It will be in the attic. Each wire seems to be 36 feet. Thanks.
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Tech808
Moderator
Username: Tech808
Post Number: 9971
Registered: 8-2002
| | Posted on Friday, May 12, 2006 - 5:28 pm: |
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Here is a Picture of the:
Workman BS1HAM Ham Dipole Antenna: Jameslarsen is talking about.
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Tech808
Moderator
Username: Tech808
Post Number: 9971
Registered: 8-2002
| | Posted on Friday, May 12, 2006 - 5:36 pm: |
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Jameslarson,
The Workman BS-1 Dipole Antenna is 32 Feet Long
"Tip-to-Tip" and this would mean that this Dipole is a :
= Full Wave Length (1 WL ) at 29.3 MHz
= Half Wave Length (1/2 WL) at 14.6 MHz
= Quarter Wave Length (1/4 WL) at 7.3 MHz
= Eighth Wave Length (1/8 WL) at 3.7 MHz
As a Dipole it should be mounted at about 16 Feet above ground,
but could be rigged as little as 8 Feet above ground.
WHY USE IT :
For those with limited space or restrictions this may be the
'small' Antenna for your Shortwave Listening (SWL) Needs.
There Reasons - Its 'complete' 'small' and 'low cost'.
HOW TO RIG IT:
Some Ideas on Rigging the Workman BS-1 Dipole Antenna using
the 'short' 12 Foot of Coax Cable. "IF" your Radio Shack has
a Window them Hang the Workman BS-1 Dipole Antenna outside
the Window :
* "UP" Under the Eaves of the House as a [Hidden] Shortwave
Listener's (SWL) Antenna.
* "From" the Eaves to near the Ground as a 'small' "Tilted"
or 'Sloper' Dipole Antenna.
* "From" the Eaves with the Center near the Ground as a
'small' "V" Dipole Antenna.
* "From" the Eaves by the Center with the Ends near the Ground
as a 'small' Inverted "V" Dipole Antenna.
"IF" you do not have a Window in your Radio Shack or can not
have an OutSide Antenna then Drill a Hole through the Ceiling
of the radio Shack and put the Workman BS-1 Dipole Antenna
In-the-Attic. Use any of the above Dipole Antenna Rigging
Schemes that meet your circumstances and individual needs.
TIP - For Multi-Story Apartment Build Dwellers - Hang
the Workman BS-1 Dipole Antenna outside a Window and
along side the building as a Vertical Dipole Antenna.
MAKING THE WORKMAN BS-1 DIPOLE ANTENNA INTO A MIN-WINDOM :
Fold one of the Wire Arms of this Workman BS-1 Dipole Antenna
over so that the "Arm" is Nine Foot (9') Long making the total
length of the Antenna 25 Feet Long and converting it to an
improved WINDOM Antenna.
Note - Don't Cut the Wire simply fold it over and back along
itself; and use a Plastic Wire Tie about every foot to hold
the two wires together -or- Make a 3.75" Diameter Coil with
the Extra Wire about Eight Turns and use Plastic Wire Ties
in 5-6 Places to hold the Coil together. The Coil can just
hang their on the end.
MINI-WINDOM SIZE AND WAVE LENGTH {FREQUENCY} :
If the Workman BS-1 is configured as a "Mini-Windom" Antenna
it would be a :
= Tip-o-Tip (25') Half Wave Length (1/2 WL) at 18.7 MHz
= Tip-o-Tip (25') Quarter Wave Length (1/4 WL) 9.4 MHz
= Tip-o-Tip (25') Eight Wave Length (1/8 WL) 4.7 MHz
= Long Arm (16') Quarter Wave Length (1/4 WL) 14.6 MHz
= Long Arm (16') Eight Wave Length (1/8 WL) 7.3 MHz
= Short Arm (9') Quarter Wave Length (1/4 WL) 26.0 MHz
= Short Arm (9') Eight Wave Length (1/8 WL) 13.0 MHz
The Workman BS-1 Dipole Antenna is Complete and Ready to Install !
Hope this helps,
Lon
Tech808
CEF808
N9CEF
CVC#2 |
Jameslarson
Intermediate Member
Username: Jameslarson
Post Number: 117
Registered: 4-2006
| | Posted on Saturday, May 13, 2006 - 1:09 pm: |
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Hi. Thanks for the info. I still don't understand how to actually "install" this. Do the wires intersect? Is there a drawing or a picture of how it should look? I do have an attic. What do I do with each wire? How do i use it for CB (11 meter) Thanks. |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 1577
Registered: 9-2004
| | Posted on Sunday, May 14, 2006 - 2:52 am: |
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james,
this antenna is meant for receiving.
you cannont transmit on this antenna without an antenna tuner (not a match box) and then who knows what the power handling would be.
this is a shortwave antenna intended for listening to freqs. from 1-30mhz.
it is not a CB antenna.
to install it, stretch the wires out away from eachother horizontally so that when the coax hangs down from the connector, it looks like a "T"
with a really long top!
the coax should be brought down at a righ angle from the horizontal part for at least 8 feet or so.
in your attic would be good, but from tree to tree would be better.
should be up 20 feet or so above ground.
i understand what you are trying to do, and here is a thread or two that might help you:
http://www.copperelectronics.com/cgi-bin/discus4/show.cgi?tpc=34&post=124840#POST124840
http://www.copperelectronics.com/cgi-bin/discus4/show.cgi?tpc=34&post=91190#POST91190
i like the half square antenna, but its not very good for local comms.
good luck,
matt |
Rldrake
Intermediate Member
Username: Rldrake
Post Number: 132
Registered: 1-2006
| | Posted on Sunday, May 14, 2006 - 10:31 pm: |
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468/Frequency in Mhz = Length in feet.
Example:
To cut dipole for CB channel 20 (27.205 Megahertz)
468 divided by 27.205 equals 17.2 feet.
So cut each leg of the dipole to 8.6 feet...or about 103 inches to be in the middle of the "CB" .
Same formula applies to all other bands.
Drawing for u
Insulator Leg CenterInsulator Leg Insulator
*----------------*------------------*
!
!
!
!
!
!
! Feedline down
! at least 1/4 wavelength
!
!
THE BROWSER WILL NOT ALLOW ME TO DRAW THIS CORRECTLY. The "feedline down" would be from the center insulator that your feedline attaches to.
As others stated, you will have much better results if you get the antenna mounted outside, in the clear...and as high as possible.
Also, you may have better results if you mount it as an inverted-V...especially if the stations you talk to are not also running a horizontally polarized antenna such as a conventional dipole or yagi. If they are really close to you, it won't matter much.
If you are planning to use it for a receiving antenna only...you will probably get the best results by cutting it now shorter than necessary to fit into the space that you have avaiable.
Also keep in mind...if you cut it for a particular band and have it mounted about a 1/4 wavelength or higher above the ground, it will be directional...strong signals broadside, nulls towards the ends. |
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