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    Of antenna of communication of 10 meters of wave band make and erect

     

      10 meters of frequency paragraph it is HF frequency paragraph the frequency with intermediate frequency top rate paragraph, this frequency paragraph having a lot of mystical character, because the attenuation of ionosphere is very small,be in when transmission is open, although be used only,very little emissive power can have unexpected remote news report. Frequency of Duanyin of 10 meters of frequency is taller, the dimension of aerial is lesser, be abstained easily and erect, and the cost of material that the place that make uses is cheap, should undertake making according to particular demand only, erect and adjust, can abstain an antenna that rivals with product antenna photograph. Having aerial is more important than choosing the transmitting and receiving equipment with a superior performance. 4 kinds introduce to be made easily in this author, cost is low, the antenna with right result.

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    ㈠ 1/2 wavelengh is perpendicular aerial

     

       The basic structure of this kind of antenna is a two 1/4 wavelengh brace up child fluctuation is perpendicular erect (if pursue one) . Aerial is tropism of not in the proper way on horizontal, can mix at any time the broadcasting station communication and liaison of 360 degrees of each direction. In perpendicular direction it is about 3 ~ 5 degrees low spoke angle of fire, what aerial sends and receive is perpendicular polarization wave, it is a kind of comfortable collaboration remote the antenna of DX communication.

    Name

    Norms

    Amount

    Aluminous canal

    Diametical 15mm grows 2.5m

    2

    Plastic pipe

    Electrician grows 35cm with 16mm of PVC internal diameter

    1

    Bamboo or wood pole

    Diametical 40mm grows 5m

    1

    Cupreous screw

    4mm X 25mm

    2

    Line ear

    4mm is used

    2

    U clip

    With advocate shank diameter is corresponding

    6

    Insulation adhesive plaster

    Line of make a present of is waterproof with

    A certain number of

    Plunge into belt

    Fixed cable is used

    A certain number of

     

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    ● is made

       If the data that aerial place uses expresses to show, it is to use the cheap thing that buys easily, want a flower to be able to be bought on one morning only commonly neat. Of aerial prop up advocate the bamboo that lever uses about 5 meters to grow or wood pole (advocate the radiate that staff grows a bit pairs of electric wave is advantageous, but the mechanical intensity of aerial can be reduced, should add pull a line to fill strong) , bamboo should be carried strong and straightforward, if use wood pole to had better want to besmear on a few paint beforehand, be able to bear or endure in order to rise Hou sex. A when be in charge of aluminium according to the graph 3 in shows position and dimension are covering electrician to drill a hole with PVC canal. The screw that use copper joins plastic pipe and two aluminous Guan Zhenzi fixed rise. Notice PVC is in charge of at the same time aperture is a bit bigger, in order to make screw head can provide a contact with aluminium. Take out coaxial cable respectively arrange 20mm core line and screen line, part ear of the line on solder. The core line coaxial cable receives the cupreous screw that above aluminium provides preparative span to go up, get on the cupreous screw that screen line receives the aluminous valve below. Twine with insulation adhesive plaster go up in contact and coaxial cable, make aerial and cable waterproof. Secure aluminous Guan Zhenzi in with U clip advocate on lever, u clip can use old TV season on-line. Use at the same time plunge into it is good to take a cable to secure. The cover that how and so on of a cap gets on on Zhen Ziding is provided in aluminium, prevent rainwater to enter aluminous Guan Zhenzi inside.

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       The material of aerial also can use the finds easily thing on your at hand to replace. And be when erect also can have change according to actual condition. For example, when if PVC is plastic the canal is bad to search, need not use, should make fluctuate only be apart of two aluminous Guan Zhenzi makes an appointment with 5mm to secure in advocate on lever, coaxial cable is mixed with cupreous screw directly two Zhen Ziduan join went (if pursue one medium sketch map) , just come so, the waterproof properties of aerial can be differred a few, raining minor local estimation impact won't be very big. Aerial brace up child also can be replaced with a variety of metal stuff, if aluminous profile, electrician wears a line with iron,canal, fine molten iron is in charge of and air-conditioner copper pipe is waited a moment. U clip can use iron wire or nylon rope to wait replace, as long as can brace up child secure strongly in advocate go on lever. Advocate lever also can use conduit of 1 inch of iron, at this moment aerial also can be like a graph 2 in that way erect, aerial Zhen Zihe pulls a line to form fluctuation 1/4 wavelengh brace up child. Pull a line to have fixed antenna already advocate the action of lever, have the effect that regards aerial as earth mat again, the insulator that draws a line can use thick epoxy resin already board treatment, also can use from the back introductory method is made with the insulating material such as plastic pipe, the antenna that such making come out works very well likewise. And, aerial establishs the model that rising is dye-in-the-wood and professional antenna it seems that.

    ● erect

       After assembling departmental component, the examination secures join to whether bear fruit, a few people search to help later, together advocate lever is erect rise. The erect place of aerial is very important to the function of aerial, should choose to widen without the place that hold back (the top that be like a building, housetop) , keep away from as far as possible antenna of high tension line, line, TV, hob or other metal object, lest do faze and effect each other. Aerial should be worn as far as possible tall, in order to improve its efficiency. Before it is good to was not adjusted in aerial, empty is secured or servantchoose a person for a job to be being maintained below first, after waiting for aerial to had been adjusted completely, undertake tightening fixed to aerial again. Be like commonly advocate lever relies on a wall to secure, with 3 two Ω model iron card is divided 3 places leave in going up fixed, very can firm. If advocate lever does not have firm support, be about to think method is secured first advocate the bottom of lever makes its cannot move, using next 3 to 4 insulation pulls a rope to part from 3 to 4 direction advocate lever is pulled firm. Putting a few direction want to exert oneself to do sth. on average at the same time when pulling a string, otherwise advocate because get power,lever is met inhomogenous and break off, leave a person to be in advocate lever bottom is monitored advocate lever is perpendicular hold direct concurrently, when at the same time pull a string taut and advocate when lever is perpendicular, at this moment although jolty advocate lever won't rock, but pull a rope to secure.

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    ● is debugged

       The adjustment of this kind of antenna is very simple, after aerial erect is finished, watch of the SWR on termination is outputted in the machine, through adjusting fluctuation brace up child length perhaps draws a line brace up child angle, compare to the standing wave of aerial (SWR) character undertakes adjustment, make wire cable obtains aerial and make a present of to match goodly, in order to improve the efficiency of system of route of day make a present of.

     

     

       Be applied in shift or erect place is narrow, use above full measure antenna of the introduction appears giant; A few spare radio lover that live in the building, cannot go up in building top as a result of a variety of reasons erect antenna, such erect antenna become an issue that makes a person nerve-racking very much. Because of what be in reinforced concrete building indoor be to cannot send and receive signal. So, possible way is extend diminutive antenna to undertake QSO from the balcony or window. 1/4 wavelengh shortens model the antenna that aerial allows to these HAM also can realize the dream of DX QSO and be designed namely.

       If the structure of this kind of antenna and principle pursue 4, be an original 1/4 wavelengh brace up child shorten, be in brace up child upright ministry joins to add feeling coil, make the electric length of the antenna after shortening and equal before, and Zhenzi of other in part comes true through ground connection. Add the setting on feeling coil a certain number of tap, use at undertaking adjustment to aerial. If plan to install antenna in the word that fixed place uses, also can decide through foretaste check the group that adds feeling coil is counted, need not tap, such antenna are more beautiful, be able to bear or endure it is better also to await a gender.

    ● is made

       If the data that aerial place uses expresses 2 to show, the Zhen Ziyue of theoretic antenna is close to 1/4 wavelengh, the efficiency of aerial is taller, accordingly, if allowing in erect condition, aluminous canal should as far as possible long. Bought aluminous valve and plastic pipe had better choose the dimension that makes aluminous canal just can be inserted into plastic pipe, such not only treatment is convenient, also make the aerial machinery intensity that makes high. When if plan to make antenna,shift is applied, aluminous canal can be replaced with telescopic antenna. First according to the graph 5 shown measure process aluminous canal and plastic pipe. After treatment is finished, begin to circle coil, enamel-insulated wire layer of insulation of a take out is secured with cupreous screw, in plastic pipe outer room is circled about 20 rounds, lie between 3 rounds make a take a percentage of a deal (if pursue 5) , scrape the insulation layer of enamel-insulated wire again on solder naked copper cash. General aluminous Guan Zhenzi is longer, the coil pen number of need is smaller, when brace up child be equal to 1/4 wavelengh (2.5 meters) when, do not need to add feeling coil. If want to raise those who add feeling coil to be able to bear or endure,await a gender, make when coil after finishing, in the epoxy resin on the besmear outside coil, if add feeling coil to do not have tap, canal of glue of usable also shrink is sealed. Aluminous Guan Zhenzi and coil are used beforehand the insulation lead join of ear of solder fine line.

    Name

    Norms

    Amount

    Aluminous canal

    Diametical 15mm is long make an appointment with 1.8m

    1

    Plastic pipe

    Electrician grows 30cm with 16mm of PVC internal diameter

    1

    Enamel-insulated wire

    Diametical 1.2mm is long make an appointment with 1m

    1

    Cupreous screw

    4mm X 25mm

    4

    Cupreous screw

    4mm X 20mm

    2

    Line ear

    4mm is used

    2

    U clip

    With advocate shank diameter is corresponding

    1

    Insulation electrical wiring

    2mm grows 2.5m

    1

    Crocodilian clip

    Switch coil take a percentage of a deal is used

    1

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    ● erect

       To make aerial produces the biggest efficiency, the attention cooperates his balcony or window, aerial wants as far as possible erect is in the position that is far from a building. Aerial is OK inclined on 45 degrees of ground are extended, should do not have above when holding back can vertically setting, OK also horizontal land is extended go (if pursue 4) , using original cool clothes stand to secure this antenna is a tweak. Because this kind of antenna belongs to ground connection model aerial, the stand or fall of ground connection can decide the function of aerial and radiation effect, but should making up in the balcony or window the ground connection with right place is not easy also is not actual. The metallic part that can try the baluster that uses the balcony or window will replace ground connection to look. The place that approaching aerial feed point drills a small hole, with attack screw oneself cable outside screen layer is received on, best outside screen layer solder line ear, can make join goes to the lavatory already so firm. After link is nice, want to undertake waterproof processing, prevent rust of day have a youthful look to cause a lot of troubles (if pursue the sketch map of 5) . Additional, OK also cable outside screen layer is received on one will replace high frequency ground contact to two 2.5 meters long electrical wiring, electrical wiring should be pulled as far as possible straight, with aerial Zhen Zicheng 90 stretch to 130 degrees, with be not being affected beautiful with other had better (if pursue 4) .

    ● is debugged

       Above all, receive on SWR watch, change the connection that increases feeling coil take a percentage of a deal at the same time, the standing wave that measures aerial at the same time is compared, be like the word with regular ground contact, standing wave comparing should be OK drop be worth to low-down. Should debug a nadir to still disrelish standing wave to compare too big or standing wave comparing cannot move a hour, with respect to the specification ground connection has a problem. Those who check cable outside the join of screen layer and ground connection is reliable, the electrical wiring spread that makes ground wire is gotten enough, whether does the periphery of aerial have the influence of metallic content to wait a moment. Finally, the cable that affirms place is used even whether of 50 ohm. If be below the situation that compares test instrument without standing wave, can be adjusted roughly only according to receiving the result, because aerial is had,send and receive double sex, receive the antenna with good effect, emissive effect also is good (also be same conversely of course) . Move receiver to sensitivity highest, adjust add feeling coil take a percentage of a deal, the noise that makes be received or signal are the strongest (best the HAM transmit help that can ask this locality is debugged) , try the electrical wiring position that changes ground wire or the angle that become with aerial place next, search signal to be nodded the most by force. Try transmit, the HAM that asks this locality acknowledges your signal strength, adjust ceaselessly till the other side receives signal to be nodded the most by force,increase feeling coil take a percentage of a deal and ground wire position.      

       This kind of antenna can apply in 10 meters of frequency not simply paragraph, increase the pen number of feeling coil through increase or decreasing, still can make aerial works at other spare frequency paragraph. After debugging adroitness, changeover frequency paragraph the take a percentage of a deal that wants changeover to add feeling coil only is OK. Want to obtain fine tuning, be about to make more take a percentage of a deal, perhaps use aerial tuner.

     

     

       Perpendicular antenna does not have tropism of in the right way, the signal that can receive far and near includes to disturb noise to wait. If hope to often have news report with the broadcasting station of a certain direction, perhaps need escape again the word of the interference of a certain direction, but erect falls " V " model aerial (if pursue 6) . Fall " V " model the graph of horizontal way radiate of aerial is 8 words model, aerial is in 0 with 180 degrees of radiate the biggest; And in 90 and 270 degrees have radiation hardly. Fall " V " model what horizontal antenna sends and receive is horizontal polarization wave, and common ground interference is behaved mostly for perpendicular polarization wave. Accordingly, fall " V " model the reception of horizontal antenna noise and interference rejection performance are better than perpendicular antenna. " V " model aerial is inferior to horizontal 1/2 wavelengh possibly on function occasionally extremely aerial is good, but place of this kind of antenna uses prop up advocate lever uses only, installation erect goes to the lavatory quite relatively, it is relatively easy also to adjust.

    ● is made

       If the data that aerial place uses expresses 3 to show, had cut PVC plastic pipe into parts first, because it just serves as insulation and the use that support, because this also can use the other insulant of at hand,replace. By the graph the dimension of 7 drills good hole. Because of brace up child not quite long, because this Zhenzi uses wider 2mm insulation lead to make, also can wait with naked copper cash or naked iron line of course replace. Make brace up child ear of the line on solder of insulation electrical wiring, cross the hole knot on plastic pipe to had been secured, good cable and join of Zhen Zila line, after making waterproof step, make with respect to what completed the feed part of aerial. Reoccupy U clip secures part of plastic pipe feed in advocate on lever (if pursue,7 are shown) . After the other one aspect of the matter of insulation electrical wiring crosses the plastic pipe of insulator, first the holiday is fixed, do not tie fast knot, undertake in order to go to the lavatory adjustment later. Lead is OK first obligate is a few longer, can avoid to discover so brace up child short should receive long lead later. Standing by the place that aerial feed chooses, the coil that circles cable into about 9 rounds with the diameter of 80mm (if pursue 6) , as the balance - lopsided converter, secure next in advocate on lever. The balance that also can introduce a product of course - lopsided converter, even need not. If need not be balanced,do not pass - the word of lopsided converter, there is high frequency electric current to flow to pass and produce parasitism radiation outside the screen layer of cable, not only the radiation direction graph of disturbed antenna, can cause TVI at the same time (the interference to the television) wait for interference. Insulator can be made with other insulating material, OK also and flat need not, use as direct knot ties the nylon string that draws a line brace up child termination, it is this kind of practice only its wear all but, but use as shift is applied there is a problem when erect temporarily. Brace up child pull a line to had better use the data beyond the metal, lest pull the radiate of line influence antenna. Advocate lever uses the bamboo with 4 6 meters long ~ or wood pole (advocate lever cannot pass short, otherwise radiation effect can sell at a discount greatly) . Advocate useful also molten iron provides staff, but allegedly of the metal advocate lever is a bit influential to the directional graph of aerial, I had not compared a difference seriously.

    ● erect

    Name

    Norms

    Amount

    Insulation electrical wiring

    Diametical 2mm is long make an appointment with 2.5m

    2

    Plastic pipe

    Electrician grows 15cm with 16mm of PVC internal diameter

    3

    Nylon rope

    Diametical 1.75~2mm grows 7m

    2

    Bamboo or wood pole

    Diametical 40mm grows 5m

    1

    Cupreous screw

    4mm X 25mm

    2

    Line ear

    4mm is used

    4

    U clip

    With advocate shank diameter is corresponding

    6

    Insulation adhesive plaster

    Line of make a present of is waterproof with

    A certain number of

    Plunge into belt

    Fixed cable is used

    A certain number of

    please Click here to get our dipole antenna

       After departmental cent installation is finished, careful and erect case advocate lever has been secured next advocate the bottom of lever. Pull open to both sides slowly brace up child line, best a person is pulled at the same time brace up child, a person is helped up advocate lever is looked carefully at advocate the perpendicular circumstance of lever. Advanced travel holiday is fixed after Zhen Zila is good, after waiting to had been adjusted completely, undertake tightening solid to pulling a string again. Both sides brace up child should go up in a plane as far as possible (become 180 degrees) pull open, this plane should to you desire the direction of communication and liaison. At the same time both sides brace up child with advocate the included angle that lever place becomes should as far as possible equal; The two arms included angle of aerial should be in 90 to 120 degrees between, can achieve first-rate radiate result, can obtain at the same time with cable match. If included angle is less than 90 degrees, the radiate of two arms can offset partly, make the radiation function of aerial becomes poor. If included angle is more than 120 degrees, aerial will become horizontal idol extremely the function of aerial. Zhen Ziduan leaves the area or the distance of floor should be in 2 meters of above. If brace up child two end too near the area (floor) , can produce capacitance effect, the ground (floor) can absorb loss one part electric wave. When advocate lever is erect and perpendicular had pulled brace up child hind, discover advocate lever not firm, should be in advocate the proper place of lever adds the insulating material such as nylon rope to pull a line to undertake filling strong, in order to enhance the security of aerial, cannot treat sth lightly absolutely to this.

    ● is debugged

       The antenna that make brace up child lead is OK obligate is a few longer, in the put apart when two end are bound a bit thrum. After aerial erect is finished, receive on the SWR that SWR watch checks aerial roughly, adjust emissive frequency, decide the syntonic frequency of aerial, when transmit debugs aerial, power should decrease as far as possible, lest cause interference and attaint transmitting tube. Be like the syntonic frequency on the low side of aerial, can shorten appropriately brace up child length or make the included angle of two arms increases aerial. Shorten brace up child need not cut really when length short brace up child, after shortening the termination of aerial however, twine bind it is OK to rise (if pursue 7) . When the frequency on the high side that discovers aerial, still can loosen come out. Such, through progressively ground nap, can make the SWR of aerial the smallest.

       Did not add a balance when aerial - the balance that lopsided converter or cable abstain - when the insufficient turn of lopsided converter, can appear two arms brace up child length is unequal, the phenomenon of the SWR ability mix up of aerial.

       When aerial adjusts a test, the person should be far from aerial, otherwise the result that aerial adjusts is not accurate. Aerial is debugged after finishing, tighten the fixed point of line of firm fine day, ensure aerial is firm and reliable.

     

     

       Casing antenna not only tropism of in the right way, and than occasionally extremely the gain of aerial is tall, the efficiency that be received accordingly and blasts off is better. The circumference of casing antenna antenna is a wavelengh about, lateral seat supports is to use aluminous control to make, be isolated from for the left and right sides, with PVC plastic pipe supports feed part, fore-and-aft brace up child it is to use electrical wiring of diametical 2mm insulation to make, the length that adjusts a line can make aerial SWR is reduced (aerial is overall installation graph is shown 8 times like the graph) . The feed of casing antenna is mixed " V " model the balance is like aerial, it is so when join of as coaxial as 50 Ω cable, should have a balance - lopsided changeover. Equivalent of this kind of antenna is two 1/4 wavelengh perpendicular antenna, of horizontal directional for spinous 8 words.

    ● is made

       If the data that aerial place uses expresses 4 to show, it is easy to get common article. The internal diameter of plastic pipe of the external diameter that aluminous canal should notice when buying material and PVC cooperates. Process aluminous canal and plastic pipe according to the dimension of blueprint, after curiuming with hacksaw aluminium is in charge of, in its the meeting that carry a department produces a lot of burr, make aluminous canal cannot insert plastic pipe smoothly in, accordingly, should use file abrasion these burr. Be in charge of aluminium by the graph the dimension of 9 inserts plastic pipe Neibinglue is added secure temporarily, be in charge of aluminium next and plastic pipe a bore, the profit that such doing is to be able to make the Kong Dou that gets out can contrapuntal accurate. But those who want an attention is, if broach is not sharp, plus the pressure that when getting, uses too old saying, the aluminium that can make aluminium is in charge of sharp edge mouth is built-in outside plastic in, card lives to aluminium is in charge of and cannot be pulled again. After all aperture had been gotten, pull aluminous tube, the place in pressing a plan is shown in plastic pipe dig 4 large hole at the same time, in order to make screw head can defect goes in to provide a contact with aluminium. After finishing each aluminium to machine and be assembled of the canal, receive cable go up and wait for contact and end with insulating tape sealed and waterproof processing. According to pursues what 8 medium overall installation graphs show a rail pipe installation to be in advocate on lever. Two brace up child line obligate is a bit a bit longer, the one aspect of the matter of the line does not want ear of the line on solder first, etc adjust after finishing again on solder. Brace up child the line is secured temporarily between two aluminous Guan Zhenzi.

    ● erect

       Entire component is installed appropriate hind, circle coaxial cable in order to make an appointment with the diameter of 100mm into to make an appointment with 9 coil, as the balance - lopsided converter, after securing good figure with insulating tape, reoccupy is plunged into take firm ground to secure in advocate on lever (if pursue,8 are shown) . If cannot find U mix, can wait for fixed rail with iron line, but when adjusting, come expediently without U clip. After rising whole antenna erect, if use advocate too fine meeting has lever to feel top-heavily, be about to add insulation additionally to pull a rope to secure at this moment. Because of tropism of aerial in the right way, if ask aerial wants to rotate at any time, be about to consider to impose the measure that can make agile roll and lock decide aerial. Common practice is to use angle iron to solder first an iron mast, dynamoelectric whirl is installed inside implement drive aerial to rotate. If plan to use this antenna at shift to apply, can be made beforehand and had debugged each brace up child. Go to the lavatory to carry, upside aluminium is in charge of Zhen Zike to become two cut in order to cut into parts, divide into two to grow about 1 meter aluminous canal namely, when using among use U clip to add fill strong receive refute of two aluminous canals again rise. The fractionation when carrying is become 4 with Zhen Zilian two brace up child line, screw, U clip, put into in fishing pole bag. To setting place, advocate lever vertical stroke rises, need to make an appointment with 20 minutes only but erect rises use, very convenient.

    ● is debugged

    Name

    Norms

    Amount

    Aluminous canal

    Diametical 15mm is long make an appointment with 2m

    2

    Plastic pipe

    Electrician grows 50cm with 20mm of PVC internal diameter

    1

    Insulation electrical wiring

    Diametical 2mm is long make an appointment with 3.7m

    2

    Conduit, bamboo or wood pole

    Diametical 40mm grows 5m

    1

    Cupreous screw

    6mm X 25mm

    8

    Line ear

    6mm is used

    6

    U clip

    With advocate shank diameter is corresponding

    2

    Insulating tape

    Line of make a present of is waterproof with

    A certain number of

    Plunge into belt

    Fixed cable is used

    A certain number of

       This kind of antenna basically is to rely on to adjust length of fore-and-aft insulation electrical wiring to undertake, receive on the SWR that SWR watch checks aerial roughly, adjust emissive frequency, decide the syntonic frequency of aerial. Cut a little commonly short take long insulation wire beforehand, with respect to the SWR value that can obtain lowest on working frequency. Wait for SWR to adjust after finishing, get on line ear solder again, secure each part screw, undertake all screw joint preventing water treatment with insulating tape next, wu is begged make aerial can bear so that live the wind storm rain henceforth.

       The amateur that suits introductory class very much makes the antenna that above place introduces, not only the requirement of material is more agile, and made repeatability is good, debug simple and practical. Change antenna brace up child dimension can apply in other frequency paragraph on. A lot of friends arrive in the morning on Sunday material buys a part such as hardware store neat, undertake making afternoon, look for a few friends to wear towards evening, OK in the evening QSO. To liking to play the HAM of mobile communication, can have made departmental component first, arrive at shift to use the land, fill minute of landform surface features, rely on the material that can find, can be in half hour erect rises, the HAM contact with each district.

       Erect antenna belongs to headroom exercise, want very safe safeguard, take strict precautions against personnel and object to drop from altitude. Do not treat sth lightly, remember safety first well. Aerial does not want erect to be in not the place that firm perhaps stands by power line, calculate reluctance wearing to rise, also make a person worry day and night, bring endless trouble. Want to suspend construction when rain and thundering, rain make construction site wet slippery, environment becomes abominable, cause hazard easily, and, damp environment can affect the character of aerial, make the adjustment of aerial not accurate.

       After aerial erect is good, want constantly the change of advertent antenna SWR, when SWR abrupt addle, with respect to the specification aerial suffers accident. Want routine every year to be checked twice to aerial, whether does the waterproof adhesive plaster that examines aerial have fall off and deteriorate, aerial and cable have deny into water, pull a line to whether loosen, advocate lever whether firm, discovery is unusual handle immediately.

       In spare radio activity, grasp hold spare spirit, the antenna that make is an activity that carries out spare spirit, want to be made attentively only, attentive adjust, will surely make an exquisite work.

     

    ㈣ casing antenna

     

    ㈢ falls " V " model aerial

     

    ㈡ 1/4 wavelengh shortens model aerial

    please Click here to get our dipole antenna

     

     

     

     

     

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