Re: RG6 Coaxial Cable - pwede ba ito gamitin sa VHF portable or base radio?

[kc18020]

ANY INFO OR SUGGESTION LANG PO . . . THANKS A LOT!

[nucleus]

ANY INFO OR SUGGESTION LANG PO . . . THANKS A LOT!

oo naman pwedeng pwede yan ang gamit ng tatay ko dati

[Google]

yan ang karaniwang gamit from antenna papunta sa isang digital tv

[gie62]

hindi mo pwedeng gamitin yan sa vhf radio. ang impedance nyan ay 75 ohms. ang ginagamit sa vhf radio ay 50 ohms.

[rdpzycho]

at the expense of SWR of 1.5. kung acceptable 'yang ganyang SWR, then you can use it, pero kung ang aim ay near 1 na SWR, use 50 ohms coaxial cable.

[rurikdgreat]

RG-6 are commonly used as tv and catv distribution coax, some used it as phasing harness (alternative for RG-11 for low power and cheaper price) in multi-stacked directional antennas in vhf. Use a 50 ohm impedance coaxial cable like RG-8 or a much cheaper RG-58 coax for vhf portable or base radio. 

[kc18020]

Salamat sa mga info. Mostly RG-6 gamit kasi dito sa saudi for disk antenna, mguuwi sana ko sa Pinas for my Radio Setup, di pala pwede dahil sa impedance. Thanks a lot to all.

[nucleus]

correct me if i am wrong dba yung sa tv ay RG-56? at yung RG-58 ay yung ginagamit na cable para sa antenna ng VHF na pangkotse at yung RG-6 naman ay yung mataba na ginagamit sa base na VHF?

[rogerjuvy]

pwedeng pwede gmitin yan rg-6,yan gngmit ko today with my 40watts allinco base vhf radio,dpnde yn sa pagkatune mo ng swr reading,mas ok panga yn dahil it comes with a a multiple ground shield,im using it with my single three directional antenna,try mo.kung di mo nagustuhan din its up to you,but for the sake of your safety,wag ka nalang mag uwi nyan galing jan saudi dahil delikado yan,bumili ka nalang dito sa atin.....

[GX]

RG-6 is a 75 ohms coax cable and RG-58 or RG-8 is a 50 ohms coax cable. By spec they are not the same, our radio tranceiver antenna impedance is 50 ohms by design and not 75 ohms. If you will connect a radio and cable with different impedance it is definitely a mismatch and you will not get a good SWR. In some case it may work depend on the half wave lenght cut of the cable, because every half wave lenght on the cable, the input impedance repeat. In between these point the impedance vary, that is why other can use or get good swr on the antenna. A bit complicated but better use a correct cable less problem and headache.

[rogerjuvy]

but how you explain why i got a swr reading of at least 1 with my rg6cable and my single 3 antenna with 40watts base connected to it.in fact it improves my receiving capabilities than the other cables ive used,

[GX]

Every half wave lenght on the cable the impedance repeat, by chance you got the right cut of the cable which matches you antenna impedance i dont say its not possible for you to match it. Try to cut short your cable the swr will change. Its hard to explain, it is explain in transmission line theory. Good for you you got good swr.

[rdpzycho]

http://www.allaboutcircuits.com/vol_2/chpt_14/7.html

everything's explained here.

[GX]

rdpzycho

Thank you for the good information clearly illustrated here.

Rogerjuvy,

This is a good material to read and understand what i mean.

[rogerjuvy]

 lam nyu sa situation natin ngayon whatever you have in your side,try it,who knows sometime it shows a good result although against the theory,for me its not a big deal as long as my radio and antenna are in the right tune and perform well.

[rdpzycho]

I've nothing against using RG-6 sa radio, sanay na sa ako sa mismatch.

[insomartin]

electronics... practicality.

[louie_sia]

better check the swr meter

[pinoycobra]

RG-6 naman ay yung mataba na ginagamit sa base na VHF?

RG-8 po or 9913 ang gamit sa base na sinasabi nyo na mataba na cable or yung heliax na hardline na tulad ng gamit sa mga antenna ng cellsite repeater station

[dan.enriquez]

Re: Re: RG6 Coaxial Cable - pwede ba ito gamitin sa VHF portable or base radio?

hindi ata pwede yan kasi ang HF / VHF / UHF & SSB radio ay gumagamit ng 50ohms coaxial cable at ang RG6 ay may 75ohms line impedance. RG6 at RG59 ay naka design para sa TV lines (75ohms). sa Radio naman RG58 ang ginagamit (50ohms).

baka masyado ng mataas ang SWR mo nakakasira din yun ng Final X'sistor ng Tx (pagmasyadong mataas ang SWR).