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Mounting Tips for the Hi-Q Series„ Series
HF Mobile Antennas
11/2007
Covered by one or more US Patent numbers:
6,275195 B1, 6,496154 B2
Please read tips before starting installation of your new Hi-Q „ Antenna
Installation and Warning Notes:
Unauthorized disassembly or failure to carefully follow instructions will
VOID your WARRANTY
Ordering and acceptance of this Hi-Q „ antenna does not constitute a
license or agreement to reproduce, manufacture, re-engineer, or copying it
in any form Hi-Q Antennas hold all patents and trade marks Patent
infringements will be vigorously challenged
KEEP your antenna CLEAN
Road GRIME can be CONDUCTIVE, clean the coil with RAIN-X
We have measured on a LIGHTNING hit coil where the DIRTY side was as low
as 220 OHMS
The dirt has give a PATH for the high voltage to travel down to the TUNED
frequency ie: where the CONTACTOR was located
At 500 watts the voltage is OVER 10,000 volts At a kW is 23,000 V
REDUCE the power when weather is winter like, slushy salted roads and
foggy
Protect your investment
NOTE: We have given this WARNING for the
past two years we shall NOT
Replace the coil free any more
The coil assy Replacement is 25000, no charge for the labour
The Hi-Q Series antenna is designed for mobile installation It is a
center loaded HF mobile antenna Consequently, in some base station
applications attic, balcony, out a window, on a fence, or tripod
installation you may need to provide an adequate counterpoise by running
several 2 to 1/4 wavelength wires out from the base of the antenna See
the ARRL Antenna Handbook for various counterpoise lengths and
specifications The MFJ-909 Antenna Matcher or a simple antenna tuner will
help
The NEW Hi-Q TAD Tune-A-Dipole and the LATEST NVIS series of HF dipole
antennas offers 21 dB gain and directivities compared to the mobile
vertical and it can be used in either horizontal or vertical configuration
NVIS is a VERY LOW noise antenna
The beauty of it that you can feed it with 52-ohm coax cable, in some cases
without any matching device and NO NEED for radials or counterpoise
See photos on the website
The NVIS antenna TAD used on a LOW Tripod will give you excellent SHORT
range communication with LOW power at a very low NOISE level
Every mobile installation is
different, and no two vehicles have the same
capacity effect on the antenna, so take time to install it properly and
match it to 52 ohms
Our antennas are in constant use around the world We are confident that
it will work superbly on your vehicle as well If you have a problem with
any installation or use, please contact us We have years of experience
and hundreds of installation histories to call on for your support BUT
only call during business hrs
Be sure to read the SUPPORT pages on the Hi-Q website
Keep in mind that with your NEW Hi-Q antenna you are radiating a LOT more
RF than you had with ANY brand X
Common MODE current may be evident by NOT being able to get low VSWR
USE as MANY toroid cores and CLIP-on Ferrites to alleviate the FLOATING RF
Use the Ferrites at EACH end of the COAX cable and the motor wires
Use the MFJ-909 or 910, or equivalent antenna matcher to achieve the low
VSWR Anything below 15: 1 is acceptable
The NORMAL Hi-Q antennas VIRGIN No shunt coil or capacitor added is:
10-12-15-17 and 20 less than 15:1 on 40 appx 17:1 and on 80 it is 24:1
at 160 M 3:1
by using the MFj-909 IN LINE of the coax AT THE RADIO END, not at the
antenna end, you can switch in
the needed cap value for good match
VSWR greater than mentioned above you need to suppress the common mode
current with lots of toroid and or ferrite cores
Good ohmic grounding and RF counterpoise will pay good dividend
IMPORTANT NOTE: 18-wheelers, most likely you want install your NEW Hi-Q
antenna on the driver side MIRROR arms This case you can use a short
extension rod and a Caphat with a very short whip
PLEASE DO NOT take the antenna through a high-pressure truck wash Remove
your antenna before taking your through the washduh We offer the Giant
Quick Disconnect GQD NEW Stainless Steel version that allows you to
quickly remove and reinstall your antenna for safety or convenience
NEW: Base FoldOver and Whip FoldOver on the accessories pages
Installation Guidelines
1 Please carefully inspect your new antenna for any damage that may have
occurred in shipping As you can see, we have taken every precaution
to make sure your new antenna arrives in factory perfect condition
If the parts box or tube is crushed, dented, or damaged in any way,
please inform the carrier IMMEDIATELY
2 Your antenna has been fully insured for shipping, but take time
to
inspect it carefully when it arrives Keep the shipping tube for
storing the antenna when not in use or for shipping should it become
necessary to do so Take digital pix of the damage if any
Included in your packages should be:
a One Hi-Q„ HF Antenna with coil assembly, lower mast and motor
housing with 3/8-24 NF threaded mounting base If you have
ordered a GQD, Giant Quick Disconnect or WQD Whip
Disconnect highly recommended it may be installed or
packaged with your antenna
b An Installation Kit consisting of two polycarbonate insulator
wafers, one 1 3/8-24 bolt, several stainless steel washers
and a 3/8 lug for the coax cable center The FEED point can
also be ONE of the 3, -28 bolts for more convenient pick up
c We are slowly getting away from the SHUNT coil, since the MFJ-
910 and the MFJ-909 capacitive antenna matcher does an
excellent job at a very low cost IT MAY BE INSTALLED AT the
RIG end you can still use a shunt coil plus the MFJ-909 if
you have lots of STATIC
electricity build up potential Use
it to match the antenna to 52 ohms during low band operation
Typically the shunt coil best used right at the antenna base,
one end to the 3/8-24 mounting bolt or to one of the three
base support bolt and the PIGTAIL from ground to the 8th turn
of the shunt coil This will change up/down in of turns
d
e Optional hardware may include the base for your GQD, a Whip
Quick Disconnect WQD, and pre-drilled MB-8 mounting bracket
f NOTE: the photo shown on the Accessory website page is and
example of how to install an UNUN if you chose to use one We
are NO LONGER sell UNUNs or pre-assembled MB-8 mounts Use
the MFJ-909 instead
g The TWO wires: RED BLACK are the 12 VDC motor wires The
TWO WHITE wires are the REED SW PULSE output to use with ANY
controller that needs a pulse to count like an MFJ-1922
etc
h The RXE-040 or “050 Self-Resetting Circuit breakers have been
installed at the motor terminals
i On OLDER Hi-Q-Antennas
a MAGNET at the motor coupler for your
SAM of SDC-100 MFJ-1922/1924 antenna CONTROLLER The magnet
location can be found JUST above the motor with a VOM and a
REED SW Appx 2-1/2 from the 6/32 Phillips screws holding
the motor in place The REED SW can be installed EXTERNALLY
j NOTE: As of 9/05 we have a NEW MOTOR and MOTOR MOUNT, in most
types the REED SW is INTERNALLY installed near the magnet s
k This is a 5000 worth up upgrade at no cost to you
l Check out the HUGE savings on the antennas offered as PLUG and
PLAY packages A and B
NOT INCLUDED are the stainless steel whips youll need These are
available at Radio Shack and cost about 15 per copy You may want to
have two of them if you want to get the MOST out of the antenna
performance However, a single 5-foot whip is a good compromise If
you want maximum performance, cut the whip as long as possible, but
keep safety in mind Never exceed 136 maximum height without
bending or restraining the whip You may want to order several of our
Whip Base Adapters that turn the
resultant whips into beautiful
extensions for your Hi-Q antenna If you have purchased the Hi-Q-4/80
antenna then one 5 ˜ or even shorter whip will serve you fine, but for
the greatest radiation Efficiency on 80/40 use the longest whip you
have with a CapHat
NOTE: In the PLUG and PLAY packages the 4 whip is NO LONGER
included
The CapHat MUST BE raised at least 1 or 2 foot above the coil with an
EXTENSTION ROD, available as an optional item
In some cases where you want to keep a LOW profile a 2 extension rod
with a CapHat ONLY can cover 10-80 M with same efficiency as if you
have used a long with only
Check out the SINGLE LOBE HEIGHT Adjustable CapHat for the STANDARD SS
whips 1500
NEW Corona balls for Heavy Duty whips; 1000
Note: Although many of the Hi-Q-HF mobile antenna users have tuned the Hi-Q
antenna to 6 M with short whip, NOT all set up will give you the benefit of
6 M operation In some cases one can find 6M by using an antenna analyzer
and keeping the long whip may find the MULTIPLE wave length for 6 M I
however RECOMMEND that you DEDICATE a separate antenna for the SIX
Meter
band
Please take the precautionary step of testing your new antenna motor
on the bench first The high-quality 12 vdc hi-torque motors require
less than 500ma So any 12vdc source will work You may simply apply
12 vdc to either lead or use a DPDT switch SEE page 8 for how to
wire the DPDT SW To reverse polarity to determine which pair
results in the up or down motion of the contactor in the coil Note
polarity for remote switch installation later Look up the
MFJ/Ameritron SDC-100 or MFJ-1922 or MFJ-1924 SIMPLE controllers, we
tested them and works GREAT
I NO LONGER recommend ANY autotune controllers, so far every one of
them has failed several times and have gone back to the DPDT SW
If you ordered the Ferrite Clip-on to use as RF chokes on the motor
DC lines, install them as close to the motor as possible Simply loop
the motor leads through the cores, one at a time You may want to
slip a piece of shrink tubing over the whole assembly to hold them
together and for protection Attach an additional length of wire to
each lead if you need longer wires to reach your 12vdc
source
Good idea is to use some ferrite clip-ons on the coax cables BOTH
ends
When shipped, the contactor is ordinarily set close to the MIDDLE
position of the coil housing This is to give you some leeway when
you first apply 12 volts to the motor The 80 meter position is
usually about one inch from the bottom of the loading coil except, of
course, on the -5/160
If you are using the MFJ-1922 or the Ameritron SDC-100 controller then
move the CONTACTOR all the way to the BOTTOM BEFORE marking the base
location of the CONTACTOR, THEN MOVE UP at least 1 or two coil turns
and MAKE THIS the
000 on the digital read out
The controller is counting the revolution of the motor shaft, ONE
PULSE by one revolution, or 20 TURNS per inch on Hi-Q-25, -3 and -4
Hi-Q-5 is TWO pulses per turn and -28 actuator shaft You need a
REED SWITCH to sense this pulse before the controller will work
Magnet can be found appx 25 above the four 6/32 Phillips head
screws REED SW mounts outside on the Hi-Q-Antennas delivered before
04/05 ALL 2006 RT antennas has BOUILT in REED SW and magnets
As
you move up in frequency, the contactor will be moving toward the
top of the coil Be sure to monitor its travel, at least until you
get a good feel for where it loads the best Higher frequencyfewer
coil windings, naturally Moving from band to band will require the
largest movement of the contactor Movement from one frequency to
another within the band will probably only requires a slight
tweaking ups or down Remember, to move up in frequency, move the
contactor up
Moving from 20 to 17 may require only a slight adjustment and the
same from 17 to 15 and so forth BE CAREFUL not to run the contactor
into the top of the coil as doing so may damage the motor The RXE-
040 or 065 circuit breakers will protect the motor for up to 5
seconds of stall, and then reduces the current to less than 100ma,
which will reduce the likelihood of motor damage
3 Install the antenna with the 3/8-24 bolt to the cars mounting bracket
or bumper mount If you have purchased the optional GQD strongly
recommended, install the base first, using the supplied hardware If
you are bolting the antenna
directly to the mount, proceed in the same
way Let us know if the mount you are using is thicker than and
well supply you with a longer bolt
The antenna must be insulated from the vehicle ground Use the two
supplied polycarbonate or Delrin insulating wafers Be very certain that
the mounting surface under these insulating wafers is perfectly flat Some
bumper hitches, especially the receiver type Reese, U-Haul and others
have punched rather than drilled holes Punching tends to leave a
concave rim around the edge of the hole and when tightening the antenna
mount, the concave shape will break the washers Thin stainless steel
shims should be used if this is the case Otherwise, use our predrilled
mobile mount MB-10 to be sure that the mounting surface is flat Use a
large, yellow lug for the feed point from the coax center conductor The
coax shield goes to the mounting bracket ground lug
4 The shunt coil may be installed at the mounting point as well see
page 9 of this guide The shunt coil can be installed either at the
base of the antenna at the 3/8-24 mounting bolt or by using a T type
coax connector at any point in the cable within 2 feet
of the antenna
base Simply add the shunt from the connector center to ground
Usually 7-10 turns of wire 15 diameter and a small spread will do
fine for 75/80 meters, and 4-8 turns for 40 meters When operating on
higher frequencies the RF will simply look through the shunt or
UNUN See the additional information enclosed on this If youd
rather, the shunt may be switched in and out with a good quality
ceramic switch If you are using the MFJ-910 antenna matcher, it can
go in the COAX line between the radio and the antenna, close to the
operators hand
5 Alternatively, you may choose to install the optional UNUN instead
Available from wwwcoilwscom the one you may need is the one offers
at least four choices of impedances The other unit I recommend is the
MFJ-909 antenna matcher
6 Be sure to use copper braid for grounding straps to the vehicle
chassis RG-8 size coax cable braid makes excellent grounding straps
7 For optimal performance of your new Hi-Q antenna, we recommend that
you elevate the feed point as high as is practical and safe NOTE:
for safe highway over head
clearance, be sure that your total antenna
height does not exceed 136 You must always use caution with the
long whip installed, as many places your car will easily fit, your
antenna WILL NOT
The whip can be as short as 2 feet for excellent 10 through 40-meter
operation and 7 feet or longer for the lower bands Again a CapHat
will greatly reduce the whip length and INCREASE the RE Radiation
Efficiency A Whip Quick Disconnect WQD is recommended for the
whips We manufacture an all-brass, silver-plated Whip Quick
Disconnect WQD”see website Accessories section The coils top
cap is aluminum and the 3/8-24 tread can be worn out by changing whips
too often NEW: WQD with FOLD-OVER top
8 The use of a WQD is recommended Do not use a stainless steel split
lock washer between the whip and the top of the coil If you feel
you must use a washer, use a soft, copper washer a 3/8 lug with wire
end cut off will do nicely If you use our Capacity Hat with your Hi-
Q antenna, you will find that the antenna ls more efficient And uses
less coil windings The best location for the Cap Hat is a foot
or
two above the loading coil, CapHat extension Rods can be found on the
Accessories page on the website, 1, and 2 long 2000 ea
The WQD is MANDATORY if you use a CapHat with the Extension rod Also:
The WQD has a 3/16 diameter hole on the male part; use this to
SUPPORT IT WHILE UNSCREWING the whip or if the whip got too tight on the
WQD FEMALE IF NOT OBSERVED you tend to make a 20000 mistake The WQD
may UNSCREW the COIL CAP and RUIN the whole coil assembly
A 3/16 dia Pin will do the job
DO NOT USE the LARGE 1632 caphats on the Hi-Q-25 antennas
NOTE to Hi-Q -25 and -3 S model users: DO NOT USE LARGE CapHat or
102 whip, when you hit a tree or? You will damage the coil assembly
cost you 12500 for a new one
9 If you experiencing trouble attaining a satisfactory VSWR, usually
15:1 or lower, you may have to use a variable inductor 0-15ÎH or
variable capacitor 100-1200 pF This situation is not typical, and
will certainly vary with the type and size of your vehicle In some
rare cases, a separate antenna tuner may be needed It is also a good
idea to use the Ferrite clip-on, data type line chokes
on the wires
coming out of the antenna motor leads to suppress the common mode
current Wrap the wires around the core at least once Do the same
thing for the coax cable Toroids may also be used This will
eliminate the RF pick-up that may alter VSWR readings or affect the
vehicles electronics To prevent RF feed back on the motor lines you
can add a pair of 100 ÎH, 2 amp chokes CLOSE to the base of the
antenna A 01 ceramic cap to from the terminals to ground reduce the
motor noise The NEW MFJ-910 or 909 HF Mobile Antenna Matcher does a
good job on matching the antenna to the radios 52 ohm
10 HI-Q Antennas make use of high-quality, aircraft-type 12 vdc PLANATARY
gear head motors, No resistor is needed to drop the line voltage The
RXE-040 or 50 Self-Resetting circuit breaker has been installed at the
12vdc line at the motor This breaker will trip out if your antenna
contactor tops/bottoms out, causing the breakers to heat They will
reset themselves within just a few moments once current is removed
Be sure to reverse the motor immediately and move the contactor off of
bottom or top
Beginning July 1, 2002, the circuit breakers are
factory installed Earlier models may require user to install the RXE-
050 Please request them from Hi-Q Antennas
11 The factory installed breakers or the circuit in the controller will
protect your antenna
Refer to the illustration on page 8 of this guide Use a momentary,
DPDT, center off switch to reverse the polarity of the motor This
switch is available at Radio Shack and other electronics dealers To
make the switch work in both directions X wires the contacts 12 to
56 Drawing shows the RXe-at the SW, NOT NEEDED Prior to
soldering the wires, insulate both leads with shrink tubing or the
insulation from some 20 wire to prevent a possible short circuit
Attach the 12vdc leads to the center two contacts on the switch Now,
attach the each motor lead to either the top or bottom set of
contacts
12 Toggle the switch in either direction and note which way the
contactor moves Solder all connections cleanly Use your VOM to
check all continuities Orient your switch to reflect up/down when
you mount it You may also add a variable
voltage control and speed-
up the contactor motion when going from 20 meters to 80 meters for
example
13 The recommended whip length is 9 feet for optimum performance on 40 80
M However, 76 seems to work very well also, as safe clearance issues
should ALWAYS take precedence For operation on 6 to 40 meters, a 2-foot
or shorter whip seems to work best It is possible to find a resonant
point for 6 10 meter bands at 5/8, , or even multiple wavelength
positions on the coil with the longer whip Feel free to experiment with
various whip lengths, capacity hats and contactor positions For MAX
Radiation Efficiency on 40/80 and 160 M be sure to use a CapHat with and
extension rod
14 WARNING: DO NOT RUN THE CONTACTOR TO THE EXTREME TOP OR TO THE EXTREME
BOTTOM of the coil OVER 170 lb pressure is developed at the HARD
contacting The Rxe-050 will protect but why push it
NOW a STANDARD installation: a MAGNET to give a signal at every
rotation for your MFJ-1922, SDC-100, SAM unit, or other controller
what may need an analog signal You add the REED switch externally
15 HI-Q ANTENNA GUARANTEE The Hi-Q„ Series of antennas
are
unconditionally guaranteed for QUALITY and WORKMANSHIP for ONE
YEAR If for any reason other than damage due to negligence,
improper usage or unauthorized disassembly your Hi-Q antenna fails
to perform due to quality or workmanship, HI-Q Antennas will, at
our discretion, either repair or replace it at no charge, WITHIN 14
days of the purchase date, shipping and handling in both
directions will be at your expense, however Please call us
before sending an antenna back to the factory A returned material
authorization RMA is necessary before warranty work will be
performed
16 If you find that the antenna does not meet the advertised
specifications or for any other reason you are dissatisfied with
the antenna, and within the first FOURTIN 14 days after your
initial purchase, HI-Q Antennas will refund your purchase price,
Shipping costs are at your expense You must inform HI-Q of your
intention to return the antenna under this guarantee provision
before shipping Refunds will be processed only after it has been
determined that the antenna has not been altered, disassembled
or
damaged in any way
Subsequent owners may, with our pre-approval, return an antenna for
repair AT OUR SOLE DISCRETION, we will either repair or replace
the antenna
Please contact HI-Q before doing anything to your antenna We can
be reached by telephone Mo-Fr- 8-5 PST If we feel that field
repair is appropriate or possible, we can help trouble-shoot the
problem and suggest appropriate action Any unauthorized
disassembly or negligent damage will void all guarantees written or
implied
17 Notes:
a Unless otherwise noted, the motor wires are black and red
The REED SW wires all black or all white
b Tighten the screws on the antenna occasionally
c Use the clip-on ferrites or the toroid cores if ordered on
the motor leads to keep RF off the motor and cut noise from
the motor in your receiver
d Please read announcements on the HI-Q websites SUPPORToften
For heavy truck or other special vehicle installation
situations please contact us We have installed our antennas
on many specialized
vehicles, and may have just the answer
for you
e Reasonable care must be given to impedance mismatch Always
observe your VSWR and/or power level At any indication of a
drastic change in either, STOP transmitting immediately
Although modern transceivers are designed to sense high VSWR,
it is still prudent to monitor it while operating in any
mode
f Do NOT PLUG up the hole where the motor wires exit from the
antenna base Do NOT use RTV silicone or tape to seal this
hole Condensation moisture, if present, drains out at this
hole
Special Note: Protect your investment keep your antenna clean Avoid
excessively dirty, grimy or salty environments Use a good quality auto
wax or RAIN-X on the coil housing and on the nickel-plated and powder
coated parts This will insure years of trouble free service
We will NO LONGER replace the coil for free Cost is 25000
Protect your investment: KEEP IT CLEAN, run lower power when dirty
Note for the Hi-Q-5/160 Antenna users:
The Hi-Q- 5/160 antennas are designed to be used with the large 30
capacity
hat Versions manufactured after 10/04 will resonate down to 1800
Kc, without a caphat using a 102 long whip Capacity hats installed at
least one foot above the coil by means of an extension rod Use a Radio
Shack or similar 102 stainless steel whip on top of the Cap Hat This may
extend the tip of your antenna above the recommended 136 height limit
However, as the US Navy Antenna Test Site in Colorado suggests, you may
BEND the whip in an arc, or at a 45-degree angle, for an even HIGHER
radiatin take off angle NVIS This method may also be used on the
standard Hi-Q antennas for additional radiation efficiency with LOW noise
pick up BUT a smaller radius due to the NVIS radiation
Due to the large coil and additional stress on the mounting assemblies, Hi-
Q-5/160 and “5/80 users may be well advised to use additional support to
the antenna This can be in the form of a NON CONDUCTIVE bracket or guying
line attached just below the loading coil and will stabilize the antenna
and enhance performance
OPTIONAL ACCESSORIES FOR YOUR Hi-Q Antenna:
2 diameter GQD Giant Quick Disconnect, a double bayonet QD to remove
the WHOLE antenna in just seconds and stores it in the vehicle
Machined
out of a single piece of stainless steel, we highly recommend this
accessory GQD : 7500
GQD light, nickel plated alum 6500
If you order an EXTRA GQD base ask for the installation kit, 1500
Large Base FoldOver 0-90 degree 5500
One and TWO foot MAST extenstions, stainless steel with 3/8-24 interconnect
stud,
@ 40 and 5000 respectively
Standard Whip Quick Disconnect WQD for the whip, new design, all brass,
silver-plated whip quick disconnect This two-piece unit speeds whip
changes 2500,
TOP only 1500, NEW WQD with FOLD-OVER 3500
Whip BASE Connector Use this silver plated brass connector after cutting
a stainless steel whip to the right length for your installation Securely
holds your whip in place 1000
Extra Polycarbonate or Delrin base insulation wafers with bolt 1500
NEW: we have installed the magnet for MFJ/Ameritron SDC-100 or SAM unit
controller that may need analog signal input
REED SW for sensing the pulse, is 1000
Second antenna purchase: 50 discount or FREE GQD, a 65 value
Mounting bracket, MB-8 1/2X2X8 long with hole drilled for the insulating
washers, 2500
Special Mercedes or other SUV mounting unit 25000
Insulating sleeve for mast used for base
station mounting, please specify
the mast inside diameter 2000
A CAPACITANCE HAT to increase the radiation efficiency of your Hi-Q
Antenna Cap Hat goes between the top of the coil, 1 extension and the
whipfewer turnsL-o-u-d-e-r signal 3500 Replaceable lobes Use 1 or 2
long extension rods with it
All prices FOB at the HI-Q factory Shipping and handling charges apply
See our Web site for details, photos and ordering/shipping instructions
Feel free to contact HI-Q at:
w6hiq@hiqantennascom , or sales@hiqantennascom
When ordering and wish to use PayPal, use the
Sales@hiqantennascom email
Thru PayPal you can use your credit cards
WE DO NOT TAKE ANY CC
By phone at 951-674-4862 Our Fax number is 951-245-2031
OPEN from 8-5 Mo-Fr, or email your questions DO NOT CALL after HRS
Installation guide and illustrations courtesy of N0XB, Northfield, MN
Do not hesitate to call us if you have any questions 73, Charlie, W6HIQ
DPDT SWITCH WIRING DETAIL
Note: ONLY one RX- is needed
Two wont make it better
To Antenna Motor
You NEED to know HOW to wind an UNUN before you set your hart on it to use
it
I
recommend the SHUNT coil OR the MFJ-910 Antenna Matcher
Antenna base
Polycarbonate
Insulating wafers
Coax CENTER to anchor bolt Coax BRAID to
ground lug
Or vehicle body via braided copper
strap
It is a PAIN to get an UNUN work, ge the MFJ-910 or 909
If needed, for motor noise reduction a pair of 100uH, 2 amp chokes may be
installed as the closest possible point to the motor at the base of the
antenna
Enjoy the use of your new Hi-Q antenna
For a lot more information and photos be sure to browse my entire website
Best 73,
Charles M Gyenes W6HIQ, VE7BOC/W6, HA5CMG
21085 Cielo Vista Way
Wildomar, Ca 92595, Phone 951-674-4862, sales@hiqantennascom
Use the MFJ-90 or 910 instead of fooling with the SHUNT coil, your choice
Hi-Q-TAD and NVIS antenna
Mounting tips for the Hi-Q TAD Tune-A-Dipole and the NEW NVIS antennas
The Hi-Q-TAD Tune-A-Dipole consists of either of the Hi-Q HF Mobile
antenna:
Hi-Q-25/80
Hi-Q-3/80
Hi-Q-4/80
Hi-Q-5/80 or the Hi-Q-5/160
It is important that you set the antenna on the bench first having 12 VDC
@
3 amps Available
Tune the CONTACTOR all the way down to the coil base, if you have BOTTOMED
it out then GO UP by reversing the polarity to REMOVE THE STRAIN on the
contactor, this is just about a turn on the coil
Do this procedure on BOTH antennas
If you are using a controller like the MFJ-1922 that counts the turns on
the motor shaft, then you need ONLY ONE REED SW on one of the antenna
If you going to use TWO MFJ-1922 or similar antenna controller that
utilyses MAGNET and REED switch, use the REED sw pulse output to each of
the MFJ controller
With the TWO units INDIVIDUALLY set to ZERO the contactors are at the
bottom now you can keep the antennas in sync
Both antennas now need to be connected to the COUPLING bracket and the TWO
MOTOR WIRES NOW NEED TO BE connected together
Run it UP/DOWN and see that the contactors are traveling in parallel
The 52-ohm coax cable shield connects to the bracket and the center to the
other antennas 3/8 bolt with the yellow lug
Install the antenna on the mast so that the V points the whip tips UP,
not drooping
The higher you get it the more efficient it gets
If you wish to use it in the VERTICAL config
Then you must use a NON CONDUCTIVE
mast
Note to NVIS Hi-Q antenna users:
The NVIS principle is to use the TAD Dipole antenna close to the ground
2 to 15 feet in height This normally achived using a simple Tripod
The NEAR VERTICAL INCIDENT SKYWAVE is appx 70-80 degrees to vertical The
signal bounces back like an HALF open umbrella covering 300-400 mile
radius
With LOW power, 5-25 watts one will have exellent communication from 18
to 10 MHz REGARDLES of the mountainous terrain in your vicinity
In my testing I have noticed 0 that is ZERO S units vs the dipole at
80 having noise level of S 6, this is one of the reason you want o have
an NVIS antenna for rag chewing with your friends in the 3-400 mile radius
The NVIS use of small dipoles close to the ground has been in use since
WWWII
———————–
4 6
2
12 VDC
Insulate each lead Insulate each lead
-12VDC
1
3 5
One lead of the matching device goes to the coax center and the other to
the coax shield/ground Matching device can be the supplied shunt coil
or
the optional toroid UNUN UNUN should be installed at the antenna base, as
illustrated The shunt coil may be mounted either at the feed point or
anywhere with two feet of the antenna base The shunt coil may be inserted
by means of a coaxial T connector in the coax feed line See following
page for suggested shunt coil installation
Coax Feed Point
Antenna Base
Shorting stub from ground to coil tap point on coil varies for VSWR
adjustment
TWO
RXE-065
DPDT, center-off, momentary switch is a Radio Shack item As described
above, wire the DPDT SW in X form
Attach poles 1 2 to the antenna motor
|Å Å’ Ã Ã Ã
ÃÃÃÃÃÃÅ?p[MB,?HhÃÃdFhÃŒ5?6Apply 12VDC to 3 4 to supply
Voltage for the motor
Note:
Rxe-065 is shown at the X wireing of the DPDT SW
NOT NEEDED on antennas mfg After 01-03
Just use plain wires To X wire
NOTE: Color of toroid winding wire may differ
The natural impedance values for the Hi-Q Series of HF Mobile Antennas are:
Hi-Q-25/40 @ 7250 MHz is approx 49 Ohms Hi-Q-25/80 @ 3750 MHz is
approx 22 ohms
Hi-Q-3/80 @3750 MHz is approx 18
Ohms Hi-Q-4/80 @ 3750 MHz is
approx 12 Ohms
Hi-Q-4/160 @ 1850 MHz is approx 10 Ohms Hi-Q-5/80 @ 3,750 MHz is
appx 10 Ohms
For the 40 and 80 Meter bands, you MUST use a matching device to bring the
feed point impedance close a nominal 52 ohms This can be easily achieved
with the supplied shunt coil A shunt coil may be made using 14 or
heavier bare copper wire, close-wound on a 125 to 15 mandrel, and then
stretched slightly to create an air gap of approximately one half of the
wires diameter between the turns–just make sure coils arent touching
each other
One end of the coil is attached to the antennas feed point at the 3/8-24
bolt and the other end to goes to ground However, before you permanently
ground the coil, determine the best VSWR by simply shorting out turns of
the shunt coil one-by-one until the VSWR reaches its lowest point This is
usually less than 15:1 Solder the ground tap at this point You may
want to test the tap at different points around the coil for fine tuning
purposes
Antenna Base Impedance Matching
Polycarbonate
Insulating Wafers
Use of the UNUN For
Antenna Base Impedance
Matching
Coupler bracket, coax shield to ground, center to antenna
Antenna 1
Antenna 2
Antenna and shield ground
Coax center to ant 2
Antennas to point UP
Source:marchofdimes.com
