Charlie Tango 11m DX Radio Group Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.


Welcome to the Charlie Tango DX Group. The home of ALL things Radio - CB, 11m DX, Amateur, PMR446, PLD, Network and Data. We welcome all radio enthusiasts of all knowledge levels. Join today and claim your own unique World Famous CT Call-sign
 
HomeEventsCalendarFAQSearchRegisterLog in

Navigation
Useful Radio Sites
Log in
Username:
Password:
Log in automatically: 
:: I forgot my password
CT Bill Board





Views This Year
All Time Views
Classified Adverts

Latest topics
» call sign request
coax - Coax query for uhf, vhf Icon_minitimeToday at 3:33 am by Rommywolf

» CRT SS 6900 N
coax - Coax query for uhf, vhf Icon_minitimeToday at 1:02 am by Chickenfoot@1987

» Whippy Antenna connector
coax - Coax query for uhf, vhf Icon_minitimeToday at 12:38 am by Chickenfoot@1987

» New Member introduction
coax - Coax query for uhf, vhf Icon_minitimeToday at 12:36 am by John123

» New member
coax - Coax query for uhf, vhf Icon_minitimeToday at 12:33 am by John123

» New Member & Call Sign Application Request
coax - Coax query for uhf, vhf Icon_minitimeToday at 12:32 am by John123

» is there anyone using cb/ sideband in the Torquay area?
coax - Coax query for uhf, vhf Icon_minitimeYesterday at 10:30 pm by Azza

» HF Contacts 10m
coax - Coax query for uhf, vhf Icon_minitimeYesterday at 6:49 pm by Rjbingham

» BREMI BRL 200 Valve Amplifier
coax - Coax query for uhf, vhf Icon_minitimeYesterday at 5:04 pm by Snowman

Keywords
ss9900 list ss6900n Mckinley bazooka power display antenna midland sign Sirio chart call SS6900 radio Calling coax 9900 6900 ALINCO lincoln Mobile frequency callsign division president
QRZ Database

 

 Coax query for uhf, vhf

Go down 
5 posters
AuthorMessage
26ct954
Major contributor
Major contributor


Call Sign : 26-CT-954, M7PLD..
Posts : 235
Times Thanked : 2
Join date : 2020-11-27
QTH or Location : Ellesmere Port
Equipment Used : icom 718,cobweb,anytone 667,
Age : 67

coax - Coax query for uhf, vhf Empty
PostSubject: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 6:28 am

Hi all putting up a 2m,70cm sharman , I have some rg58 left over is it OK to use this... Thanks...
Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 2369
Times Thanked : 161
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 7:05 am

Hi Chris,

All depends on how long your coax run is going to be. Wink

When you get into the world of coax and it's losses you'll have typical lookup tables for 100ft lengths, (30m in new money). But it should be obvious that if you use much shorter lengths, (my attic antenna run is only about 12ft), the loss issues will be far less. It's quite common for VHF 'marine' installations on small boats to be fitted with RG58.

I have no idea where you'll be installing your antenna or where the radio will be so ultimately your coax length. If you're making a long run, (antenna on top of the house, radio on the ground floor), then the longer lengths will start making a dramatic difference. At 100ft a 10W transmission on RG58 may be cut down to 2-3W reaching your antenna on VHF and you might get as little as 1W on UHF!!  Shocked

Of course the situation will be worse for your UV5r as you more than likely have much less than 10W to start with.

If you're doing a big installation such as fitting the antenna to the roofline, chimney or some such then it's probably best to start with the best coax you can afford. The last thing you want to do is go to all that trouble then have to get back up there just to change your coax(!)

If you're bolting the antenna to a fitting on the side of the house at the gutter line and only using a shorter coax run into the house to the radio then you'll more than likely get away with the RG58.

As I mentioned, my VHF/UHF antenna, (dipole), is in the loft space just above my radio room and as such I knew I'd get away with my RG58. Smile


Hope that helps you mate.

All the best,
Victor

26ct954 likes this post

Back to top Go down
View user profile https://www.qrz.com/db/M7VIC
26ct954
Major contributor
Major contributor


Call Sign : 26-CT-954, M7PLD..
Posts : 235
Times Thanked : 2
Join date : 2020-11-27
QTH or Location : Ellesmere Port
Equipment Used : icom 718,cobweb,anytone 667,
Age : 67

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 7:16 am

Hi Victor thanks for that help, it's going to be bolted about gutter line, probably be about 20ft of coax at the moment while its all setup in the dining room, until I can get it into the spare room, then it will only need approx 8,10ft, might just order some rg58x to play safe, my missus says you just like to spend, oh well you can't take it with you... Thanks...

Victor likes this post

Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 2369
Times Thanked : 161
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 7:27 am

No worries Chris. Nice to see you excitedly getting your Ham station setup after gaining your new qualification. 👍

26ct954 likes this post

Back to top Go down
View user profile https://www.qrz.com/db/M7VIC
26ct954
Major contributor
Major contributor


Call Sign : 26-CT-954, M7PLD..
Posts : 235
Times Thanked : 2
Join date : 2020-11-27
QTH or Location : Ellesmere Port
Equipment Used : icom 718,cobweb,anytone 667,
Age : 67

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 7:36 am

Got a good price on the aerial from your location £49 Cranfield Rd, I think it's the sharman 2m,70cm, good gain 7.5db on uhf..

Victor likes this post

Back to top Go down
View user profile
Alan Pilot
Major contributor
Major contributor
Alan Pilot

Call Sign : 163-CT-220...MW7TTA
Posts : 1151
Times Thanked : 31
Join date : 2019-11-19
QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 8:00 am

RG8x do you mean lol.
Soon have that shiny new m7.

26ct954 likes this post

Back to top Go down
View user profile Online
26ct954
Major contributor
Major contributor


Call Sign : 26-CT-954, M7PLD..
Posts : 235
Times Thanked : 2
Join date : 2020-11-27
QTH or Location : Ellesmere Port
Equipment Used : icom 718,cobweb,anytone 667,
Age : 67

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 8:03 am

Yep getting my coax wrong,, will be on nervous pacing all week...
Back to top Go down
View user profile
Alan Pilot
Major contributor
Major contributor
Alan Pilot

Call Sign : 163-CT-220...MW7TTA
Posts : 1151
Times Thanked : 31
Join date : 2019-11-19
QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 8:22 am

I would look at Thursday and if it comes before a bonus.
Did my test on a Tuesday it came on the Saturday.
Victor got his quicker think he got his in 2 or 3 days.
From what i believe it is a lady that does them one at a time i would think as i think she is a volunteer but i could well be totally wrong on that.

26ct954 likes this post

Back to top Go down
View user profile Online
26ct954
Major contributor
Major contributor


Call Sign : 26-CT-954, M7PLD..
Posts : 235
Times Thanked : 2
Join date : 2020-11-27
QTH or Location : Ellesmere Port
Equipment Used : icom 718,cobweb,anytone 667,
Age : 67

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 10:22 am

Just had a email from moonraker UK, they said rg58 is ok for short lengths I said 12, 15ft..

Victor likes this post

Back to top Go down
View user profile
Bean
Senior contributor
Senior contributor


Posts : 170
Times Thanked : 6
Join date : 2019-06-29

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 10:25 am

Aircell 7 is pretty good stuff ,dual screened .

26ct954 likes this post

Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor

Call Sign : 26-CT-3228 Ham M7VIC
Posts : 2369
Times Thanked : 161
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 10:47 am

They're a great lot at Moonraker Chris, (my local outlet Wink) Alway give good and sensible advice.

Don't wear out your carpet pacing on that certificate arrival.
Got mine quickly but I'm only spitting distance from RSGB headquarters. The mule pack tends to take longer travelling out to the wilds and fringes Very Happy

26ct954 likes this post

Back to top Go down
View user profile https://www.qrz.com/db/M7VIC
43CT016
Major contributor
Major contributor
43CT016

Call Sign : 43-CT-016
Posts : 216
Times Thanked : 14
Join date : 2019-11-17
QTH or Location : Perth
Equipment Used : iCom IC-7610/IC-9700

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 11:26 am

26ct954 wrote:
Just had a email  from moonraker UK,  they  said  rg58 is ok for short lengths I said  12, 15ft..

Depending on whose RG58 you use, you’re looking at about 10dB of loss per 100’ at 450MHz.

Now, and forgive me if I’m teaching you what you already know, remember that 3dB equates to half power, and 6dB is quarter power....so if you had a 100’ run, you’d be losing 90% of your signal!

Scale that back to your 15’ though, and you’re only losing 1.5dB which is easily tolerable (a mere sixth of your power lost)....but for the cost of 15’, I’d probably run something better anyway! Very Happy

26ct954 likes this post

Back to top Go down
View user profile
26ct954
Major contributor
Major contributor


Call Sign : 26-CT-954, M7PLD..
Posts : 235
Times Thanked : 2
Join date : 2020-11-27
QTH or Location : Ellesmere Port
Equipment Used : icom 718,cobweb,anytone 667,
Age : 67

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 11:27 am

What do reckon rg8x
Back to top Go down
View user profile
43CT016
Major contributor
Major contributor
43CT016

Call Sign : 43-CT-016
Posts : 216
Times Thanked : 14
Join date : 2019-11-17
QTH or Location : Perth
Equipment Used : iCom IC-7610/IC-9700

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 11:37 am

26ct954 wrote:
What do reckon rg8x

You’re asking a cable snob. Very Happy

For that run, anything will work....but whatever you go for, get quality branded cable, not eBay crap where the shield hardly covered the dielectric! 

Personally, I’d go a thicker cable, but that’s just me, and not because you need to. I usually buy lengths of coax whenever I see it at a good price, and then over engineer everything.

Victor and 26ct954 like this post

Back to top Go down
View user profile
Alan Pilot
Major contributor
Major contributor
Alan Pilot

Call Sign : 163-CT-220...MW7TTA
Posts : 1151
Times Thanked : 31
Join date : 2019-11-19
QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 11:40 am

Up to you.
Main thing is you want that 2/70m aerial up as high as possible so you don't want to be going up there again in a hurry.

Victor and 43CT016 like this post

Back to top Go down
View user profile Online
43CT016
Major contributor
Major contributor
43CT016

Call Sign : 43-CT-016
Posts : 216
Times Thanked : 14
Join date : 2019-11-17
QTH or Location : Perth
Equipment Used : iCom IC-7610/IC-9700

coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitimeMon Feb 15, 2021 11:46 am

Alan Pilot wrote:
Up to you.
Main thing is you want that 2/70m aerial up as high as possible so you don't want to be going up there again in a hurry.

Ah, the beauty of double story houses with chimneys! I remember those! 

Oh, and just to add, seal the connector, or you’ll be cleaning it all up sooner than you’d like when your SWR goes through the roof one day....I usually use self-amalgamating tape with insultating tape over the top, to stop the Sun’s UV rotting the sealing tape...but that will be less of an issue back in the UK. Laughing

Victor and 26ct954 like this post

Back to top Go down
View user profile
Sponsored content




coax - Coax query for uhf, vhf Empty
PostSubject: Re: Coax query for uhf, vhf   coax - Coax query for uhf, vhf Icon_minitime

Back to top Go down
 
Coax query for uhf, vhf
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Charlie Tango 11m DX Radio Group Forum :: Help and Discussion Forums :: Antenna Discussion-
Jump to: