BIONIC_TEXAN88
Member
what type coax do i need for running an antenna on my truck and also gonna run one mounted on my old tv antenna pole. thanks.
what type coax?
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N
N_Jay
Guest
BIONIC_TEXAN88 said:
The best you can afford!
Keep them both as short as practical.
BIONIC_TEXAN88
Member
so it doesnt matter if its rg58, rg59, etc....... i wasnt sure what resistance i needed. for my house i needed 50 ft or so. is that too long?
K5MAR
Member
For the house: LMR-400 (Best) LMR-200 (2nd best) RG-6QS (good) RG-8/RG58 (mediocre at higher freqs)
For the truck: LMR-200 (best) RG-58 (OK)
If you can't afford or don't want to spend the money for the LMR coax for your house, than the RG-6QS is your best option for receive-only. The RG-58 is acceptable for the truck due to it's shorter run.
Mark S.
For the truck: LMR-200 (best) RG-58 (OK)
If you can't afford or don't want to spend the money for the LMR coax for your house, than the RG-6QS is your best option for receive-only. The RG-58 is acceptable for the truck due to it's shorter run.
Mark S.
N
N_Jay
Guest
BIONIC_TEXAN88 said:
If it is a 50ohm antenna and receiver try to stick with 50 ohm cable.
RG-58 is about the cheapest you can find, so I hope it is not the best you can afford.
It is a great attenuator for 800 MHz.
You will have about 1/10 of the signal left after 50 feet.
There is not much magic to it. In general the bigger then better, and foam is better than solid insullation, and air is better then foam.
JnglMassiv
Member
"great' meaning large or immense..N_Jay said:
He used the term in the perjorative sense.
N
N_Jay
Guest
JnglMassiv said:
Pejorative?
JnglMassiv
Member
Er, oops..typo there.
Pejorative
*High-fives N_Jay*
Pejorative
*High-fives N_Jay*
N
N_Jay
Guest
JnglMassiv said:
No prob, I am the WORST speller and an even worse typer (typest).
I only noticed it because I had used a dictionary program to make sure I was not missing some subtle meaning.
Here's a listing of coax loss at 100 ft. I just hope the list formats okay after I send this message. It looks messed up right now but it look fine intxt form.
I use RG-6 for all my antennas (4) receivers (bunch) with the longest run being 77 feet.
Coax Cable Signal Loss (Attenuation) in dB per 100ft*
Loss* RG-174 RG-58 RG-8X RG-213 RG-6 RG-11 RF-9914 RF-9913
1MHz 1.9dB 0.4dB 0.5dB 0.2dB 0.2dB 0.2dB 0.3dB 0.2dB
10MHz 3.3dB 1.4dB 1.0dB 0.6dB 0.6dB 0.4dB 0.5dB 0.4dB
50MHz 6.6dB 3.3dB 2.5dB 1.6dB 1.4dB 1.0dB 1.1dB 0.9dB
100MHz 8.9dB 4.9dB 3.6dB 2.2dB 2.0dB 1.6dB 1.5dB 1.4dB
200MHz 11.9dB 7.3dB 5.4dB 3.3dB 2.8dB 2.3dB 2.0dB 1.8dB
400MHz 17.3 B 11.2dB 7.9dB 4.8dB 4.3dB 3.5dB 2.9dB 2.6dB
700MHz 26.0dB 16.9dB 11.0dB 6.6dB 5.6dB 4.7dB 3.8dB 3.6dB
900MHz 27.9 B 20.1dB 12.6dB 7.7dB 6.0dB 5.4dB 4.9dB 4.2dB
1GHz 32.0dB 21.5dB 13.5dB 8.3dB 6.1dB 5.6dB 5.3dB 4.5dB
Imped 50ohm 50ohm 50ohm 50ohm 75ohm 75ohm 50ohm 50ohm
I use RG-6 for all my antennas (4) receivers (bunch) with the longest run being 77 feet.
Coax Cable Signal Loss (Attenuation) in dB per 100ft*
Loss* RG-174 RG-58 RG-8X RG-213 RG-6 RG-11 RF-9914 RF-9913
1MHz 1.9dB 0.4dB 0.5dB 0.2dB 0.2dB 0.2dB 0.3dB 0.2dB
10MHz 3.3dB 1.4dB 1.0dB 0.6dB 0.6dB 0.4dB 0.5dB 0.4dB
50MHz 6.6dB 3.3dB 2.5dB 1.6dB 1.4dB 1.0dB 1.1dB 0.9dB
100MHz 8.9dB 4.9dB 3.6dB 2.2dB 2.0dB 1.6dB 1.5dB 1.4dB
200MHz 11.9dB 7.3dB 5.4dB 3.3dB 2.8dB 2.3dB 2.0dB 1.8dB
400MHz 17.3 B 11.2dB 7.9dB 4.8dB 4.3dB 3.5dB 2.9dB 2.6dB
700MHz 26.0dB 16.9dB 11.0dB 6.6dB 5.6dB 4.7dB 3.8dB 3.6dB
900MHz 27.9 B 20.1dB 12.6dB 7.7dB 6.0dB 5.4dB 4.9dB 4.2dB
1GHz 32.0dB 21.5dB 13.5dB 8.3dB 6.1dB 5.6dB 5.3dB 4.5dB
Imped 50ohm 50ohm 50ohm 50ohm 75ohm 75ohm 50ohm 50ohm
BIONIC_TEXAN88
Member
i think i will be using rg6 because i found like a 100' laying im my garage. im glad to know thats not the worst choice i can have. its definately the cheapest. so if that's signal loss per 100 ft, would it be 1/2 that if i were to use 50 ft?
N
N_Jay
Guest
BIONIC_TEXAN88 said:
Yes.
BIONIC_TEXAN88
Member
does it matter that the rg6 is 75 ohm? i think my pro 90 and the discone that i am gonna use mention to use 50 ohm line.
TeRayCodA
Member
No,it does not matter,-You are not transmitting.I use RG-6 on all of my receiver antennas,for one,it is cheaper,connectors are easy to find,and I was given about 500+ft by the "Cable Guy"who accidentally cut off ariel cable rather than bury cable.
After a few curse words,he asked me if I needed it,because he did'nt want to account for it,and it was late in the day.
I took it off his hands graciously!
After a few curse words,he asked me if I needed it,because he did'nt want to account for it,and it was late in the day.
I took it off his hands graciously!
NorwalkRXing
Member
I run RG/6 coax also, but my question is , does the coax have to be cut to the nearest foot to get the best proformance from it..? for istance, i'm running 60', 6" of coax from my discone to my scanner, should i cut that extra 6" of to make it just 60'? will it make that much of a difference recieving wise?...just curious! 
JnglMassiv
Member
I think I know what you're thinking of (cutting to match frequency/wavelengths) and, other than to say again that shorter is always better, its not going to make any difference.NorwalkRXing said:
Coax is carefully cut to match wavelengths (or fractions i.e. quarterwave, half wave, etc) on higher power transmitters and especially as frequency gets higher, say 900MHz and up. For most scanning applications, since there's a large range of frequencies one wishes to recieve, trying to tune coax would be a never ending battle.
You can hang on to the 60' 6" length and use it for reference if you're ever building a baseball field... :wink:
NorwalkRXing
Member
I'll keep that in mind!
N
N_Jay
Guest
JnglMassiv said:
Coax is rarely cut to match any particular frequency (Unless you are trying to fix a problem antenna the wrong way).
NorwalkRXing
Member
not a problem really, just trying to use the least amount of coax as poss. the 60"6" allows me to put the scanner on my desk where I want it..it also gives me a little slack incase I want to move it else where on my desk...thanx for the help!
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