BARKER & WILLIAMSON AP-10B User manual

BARKER&WILLIAMSON
603 CIDCO ROAD
COCOA,FL32926
321-639-1510
MODEL AP-10B ANTENNA
40 - 10 Meters Continuous Coverage
6 and 2 Meter Bands
PowerRating: 300WPEP
The AP-10B is a base loaded style antenna for 10 through 40 meters continuous frequency
coverage(all frequenciesfrom 7through 30Mhz). Operation on2 and6 metersis alsoprovided
withouttheuse of loading coils. Thebracketdesign allows simple installationsfor apartments,
townhouses,trailers,boats,hotels,etc. Ithasprovenitsabilitytoprovideaquickanddependable
antenna system when regular antennas cannot be used. The AP-10B has also found application
in emergency communication work when conventional antennas have been put out of service.
When adjusted properly to your operating frequency, VSWR is 1.1:1.
Asinanyverticaltypeantenna,agroundradialsystemorcounterpoiseisessentialformaximum
results. TheAP-10Butilizesacounterpoisetomaketheantennafunctionproperly. Byadjusting
thecounterpoiselength,youwillbeabletocompensateforvaryingconditionsduetosurrounding
objects, grounds, etc.
SETUP
Referring to figure 1, mount the coil assy to the window bracket with the large wing nut and washer, placing the counterpoise lug
(no counterpoise for 2 or 6 meters) underneath the wing nut. Attach the wire from the coax connector center conductor and fly lead
to the lower end of the coil, using the small wing nut and lock washer as illustrated. Place the antenna whip on the other end of the coil
assy and use the two small set screws to secure it. Extend the whip to full length and clamp the bracket to your support. If the support
is metal, insulate the bracket using material such as cardboard or thin wood. Connect your coaxial cable to the antenna and radio.
OPERATION
To properly utilize the antenna, you must perform two steps to tune it for your frequency of operation. First, the fly lead must be set on
the coil. Then, the counterpoise length is adjusted and fine tuned for good VSWR. The table will give you settings for common bands.
To set the fly lead on the coil, check the table for the number of windings down from the top of the coil to clip to. Figure 2 shows how to
count the windings from the top (the end the whip attaches to), and where to locate common bands. When using the clip on the fly lead,
makesurethatthescrewisloosebeforepushingonorpullingoffthecoilwire,thentightenthescrewmoderately. Theclipisbestattached
next to a plastic rib on the coil, where the wire is held up the highest from the PVC support pipe underneath.
When adjusting the counterpoise length, roll up the unused portion from the free end into a coil. A giant size paper cup works great for
this, or simply use your hand. Start out at the suggested length in the table, and then fine tune with a VSWR meter or power meter. The
counterpoise may be laid on the floor. Best results will be obtained with the counterpoise parallel to the antenna. For rooms above the
groundfloor,slightimprovement inoperationcansometimesbenotedbyhangingthecounterpoiseoutside,downthewall. Foroperation
on a boat or mobile home where the deck or floor is metal, the counterpoise may have to be stretched two or three feet above that surface.
When you achieve a good SWR, mark the counterpoise and coil for a favorite band with a magic marker. If you cannot adjust the SWR
low enough with the counterpoise, but have seen a definite dip, you need to readjust the flylead. Note that the higher the frequency you
are working with, the more sensitive the adjustments become.
On2and6meters,thecoilisbypassedwiththeflylead,andthecounterpoiseisnotused. Antennawhiplengthmaybeadjustedasnecessary.
COIL/COUNTERPOISETABLE
Frequency FlyLeadCoilAdjustment Counterpoise
40meters Use all of coil, detach the fly lead 35-40Ft
30meters Attach fly lead 25.5 turns down from top (point E in Fig 2) 17Ft
20meters Attach fly lead 14.5 turns down from top (point D in Fig 2) 12.5Ft
17meters Attach fly lead 10 turns down from top 9Ft
15meters Attach fly lead 6.75 turns down from top (point C in Fig 2) 7Ft
12meters Attach fly lead 5 turns down from top 5.5Ft
10meters Attach fly lead 4 turns down from top (point B in Fig 2) 4.5Ft
6meters Bypass all of coil with fly lead (point A in Fig 2) No counterpoise. Ground bracket.
2meters Bypass all of coil with fly lead (point A in Fig 2) No counterpoise. Don't ground bracket.
www.bwantennas.com
Coil and counterpoise settings may vary some in your installation due to ground conditions. Note that any frequency between approx 7
and30Mhzmaybetunedwiththecoil. First,setthecoilclipbyinterpolatingfromthetable,thentunethecounterpoisewithaVSWRmeter.

WARRANTYSTATEMENT
Barker&Williamsonguaranteeseachproducttobefreefromdefectsinmaterialandworkmanshipfor90daysfromdateofpurchase. Thewarranty
appliestotheoriginalpurchaseronly,andwewillrepairorreplacetheproductatourdiscretion. UndernocircumstanceswillBarker&Williamson
beliable foranydamagesorconsequentialdamagesarising fromuseormisuseofourproducts. Warranty isvoidedifproductissubjecttomisuse,
neglect, accident, improperly installed or used in violation of the instructions furnished by us. We reserve the right to make changes in design
at any time without obligation to update previously manufactured models. This warranty is given in lieu of any other warranty, expressed or
implied.
Figure1 Figure2
10/04
1
5
10
15
20
25
30
35
40
Antenna Whip
Connection
1/4-20 Stud for
Support Bracket
Fly Lead
A
44
B
C
D
E
Connect Fly-lead and coax center
conductor wire here. Use 6-32
lockwasher and wing nut.
Connect counterpoise here. Use
1/4-20 lockwasher and wing nut.
This also holds coil assy to the
bracket.
UHF Coax
Connector
Attach antenna with
two set screws.
NOT TO SCALE