antenna..

[roisantos]

mga mate cnxa na.d kc ako bihasa sa electornics pro hilig ko un.i'm using 2 way radio,ok na ung signal transmit mdyu mlakas na pro my tnong lng ako bka my maronong sa inyu or tips pra mas lallo pang lumakas ung signal transmit.thanks

[rurikdgreat]

paano ibig mong sabihin?

tweak and modification ng radio o ng antenna?

as a rule of thumb, always tune your antenna to the lowest swr ratio (1:1) as possible. 

[roisantos]

ok na pre nka swr na un.gsto ko lng kc mlaman kng my pwede pang gwin pra lumakas ang transmit..my booster ako pro d ata kya ng 15 amp supply.pg press kc ng PTT my tunog na prang barko..ano sa tingin mo bili kya ako ng 30amps or pwde ba ung 15amp convert to 30amps.?

[rurikdgreat]

ok na pre nka swr na un.gsto ko lng kc mlaman kng my pwede pang gwin pra lumakas ang transmit..my booster ako pro d ata kya ng 15 amp supply.pg press kc ng PTT my tunog na prang barko..ano sa tingin mo bili kya ako ng 30amps or pwde ba ung 15amp convert to 30amps.?

ilan ang output ng bota mo? mayroon akong daiwa 5 watts in 90 watts out, 11-12 amps ang kinakain nya. yung 50w in - 160 watts out kumakain ng 26-28 amps. 

di pwede iconvert ang 15 amps to 30 amps (using power transformer) rps

[roisantos]

dko alam pre.bgay kc un mg kaibigan ko.cguro mga 5owats ata un.so ano advice mo dun pre,eh 15 lng suply ko.totoo ba na mkakasira ng final un,ICOM 02n kc ung radio ko.

[rurikdgreat]

dko alam pre.bgay kc un mg kaibigan ko.cguro mga 5owats ata un.so ano advice mo dun pre,eh 15 lng suply ko.totoo ba na mkakasira ng final un,ICOM 02n kc ung radio ko.

hindi ang radio ang nakakasira ng finals kundi ang mataas na swr. kung hindi maganda ang swr ng antenna mo maaaring masira ang final amplifier ng linear mo. check mo.

[bravokilo]

ROI, start witht he antenna. ang radiowaves ay parang ilaw.  If light up a buulb walang reflector, it will disperse equally all around. If you "focus" the light such as in the flashlight, the light will get concentrated and focus and will light up a spot.  Same thing with antenna.  Kung "omni" yan such as a 5/8 co-linear, a ting ting, aan inverted J, open lamp yan. You must use a yagi which I used to build years ago.  The books are still here.  the more the element, the narrower the beam. Pero bingi kas sa likuran ng antenna.  Trick is to have an omni tolisten in, then once you hear a faint contak, switch tothe yagi and hunt him down.  You will need a rotator. Lahat yan I build. Free consultations. power supplies has limits on the transformer. To uipgrade a new transformer is needed but you can parrallel transformers or parallel PS to increase the capacity.



BK 09197726274 

[BATHALA]

Sir tinatanong nyo kung pano mapalakas pa ang layo na inaabot ng 02n vhf radio nyo. opo lagyan nyo ng booster. pero bago yun check nyo muna ang standing wave ratio ng antena ninyo. compatible ba sya sa booster at vhf transciever mo? kung hindi po i tune nyo na muna ang antenna. yung sabi nyo kung kaya ng
PS nyo na 15 ampere. kung umuugong po maaring kinakapos ng supply. regulated po ba yung P.S. nyo? maari po na may problema na ang filter capacitor kung palaging maugong. may ginagamit akong booster almost 90watts. per0 mga 70 lang or sbihin nating 50 watts ang power out put nun, with 02AT na radio with F23 antena. pero kaya naman sya ng 15 ampere kung power supply. siguro para sure ka palit ka ng mas mataas na amperahe ng power supply. yun po 15 ampere na power supply hindi na po yun pwedeng i convert sa 30 amperes kasi yun na po ang design nun. marami kang pyesa babaguhin dun. much better bili ka na lang ng bago.

[hamkid]

i like how you answered the questions guys..ham nga! heheh

[angelg]

any comments about sa antenna x 510ma,ganun ba ito kalakas sa mga amateur frequency.

[stcboy]

  for  x510

     okey ang bandwidth niya as the swr is good in the amateur band
    di masyado nag-iinit radio even in full power but for coverage pareho
    ng ringo ranger  as in my set up is only 20 ft above ground . Maybe
    if higher tha better. Tahimik din at mababa ang noise level. at
   dualbander capability

[marvinmx250]

kung ang antenna ay may range ng 144-174 mHz, pwede na ba itong mag transmit and receive at any frequency between 144-174 mHz out of the box or may kailangan pang i-configure? sabi kc sa website ng diamond ang F23: Factory adjusted, no tuning required. According naman sa mga kilala kong ngraradio evry antenna needs tuning. Tnx.

[stcboy]

sa receive  pwede pero sa transmit  masyado malaki bandwidth  ( 144-174 mhz)  kailangan tune mo for specific  bandwidth  dahil  affected ang swr mo. if you have swr meter i-try mo  feed mo at least 5watts to the antenna and watch the meter while you vary the freq between those value you mention at there will be variation of swr and power reading as well.

[marvinmx250]

Sorry 4 d ignorance. How bout kung may range na 440-450 mHz ang antenna, will it receive at 414.00 mhz and 479.00 mHz? Tnx.

[bravokilo]

Hi Marvin.

    Your antenna might receive signals at that frequency depending on the distance and the transmit power of the other party. But do not attempt to transmit. presumable and lowest SWR dun sa range binigay mo ay sa gitna. On both ends highest na yung SWR dun. so, mas lalo    kung lumanpas ka pa.

     Gain and bandwith has to be compromised.  Dun sa yagi, the more elements the longer and narrower yung lobe ng signal pattern (similar sa Rx and Tx mode) anbd the greater the gain. Pero, na tono nga dun sa exact frequency, so nrrow and bandwidth.  Ibig sabihin bigla tumass ang SWR pag na move away from the center frequency. Yung tanong mo, kung malakas ang signal, masakap yun pro habang humihina, mawawala yun compared to the center freq. of that antenna.

BK

[marvinmx250]

Tnx for the info bravokilo.

I'm planning to acquire and set up a Diamond X50 dual band antenna with ranges of 144-148 mHz and 440-450 mHz.

Meron pa akong isang gustong ma receive na signal which is from 453.225 mHz. In this case narereceive ko nman using a portable radio with a stock antenna kya nga lang hindi full scale and kailangan nasa outdoor ako. Ang gusto ko kc mangyari is to improve the receiving capabilities of the transceiver kahit nasa indoors ako. Wat more can u suggest?

TIA.

By the way ano meaning ng BK?

[marvinmx250]

BK, bravokilo? Thought it's an abbreviation of a terminology d2 sa electronicslab. Disregard na previous ? ko. Tnx.

[GX]

Marvin

the X50 is out of the range of your target freq in UHF, you can use it for receiving but not on transmit. Iam sure high SWR you will get with the X50 sa target freq mo. If you really want a tuned antenna for 453mhz try to make a quater wave or a 5/8 wave lenght.

[marvinmx250]

Tnx GX. Ok na ba RG59 cable to use with the X50?

[rurikdgreat]

Tnx GX. Ok na ba RG59 cable to use with the X50?

Use RG-58 (50Ω impedance). RG-59 has 75Ω.