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
 
HomeEventsCalendarFAQLatest imagesSearchRegisterLog 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
» I Fancied a 'Touch' of Morse
inverted l on 80 meters Icon_minitimeToday at 6:43 pm by Victor

» Latest acquisitions
inverted l on 80 meters Icon_minitimeToday at 6:41 pm by 907mrchris

» Cobra 148 whats people's thoughts on it
inverted l on 80 meters Icon_minitimeToday at 6:26 pm by RadioWavez

» HELLO WORLD
inverted l on 80 meters Icon_minitimeToday at 6:24 pm by RadioWavez

» Homebrew 2m/70cm Dipole Antenna
inverted l on 80 meters Icon_minitimeToday at 6:17 pm by RadioWavez

» Introduction and callsign request please (Issued)
inverted l on 80 meters Icon_minitimeToday at 3:52 pm by Lynton

» Software problem.
inverted l on 80 meters Icon_minitimeToday at 2:55 pm by WHEELNUT

» NEW RADIO CHOICE ?
inverted l on 80 meters Icon_minitimeToday at 2:50 pm by WHEELNUT

» Help! Dynascan 10M66
inverted l on 80 meters Icon_minitimeToday at 2:43 pm by 13oots2

Keywords
president 9900 division display 2023 power meter ss9900 lincoln Mckinley Baofeng Calling chart list 6900 frequency sign ALINCO call antenna yaesu callsign 2022 cards Sirio Mobile
QRZ Database

 

 inverted l on 80 meters

Go down 
4 posters
AuthorMessage
rabbi
Senior contributor
Senior contributor



Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 133
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

inverted l on 80 meters Empty
PostSubject: inverted l on 80 meters   inverted l on 80 meters Icon_minitimeFri Oct 23, 2020 10:31 am

hi i have an inverted l with 50 ohm coax to the end of my garden aprox 80 ft in all what balun can i make for the coax termination i only use this inverted l on 80 meters and for listening for hf am broadcast stations thanks for looking stay safe do radio
Back to top Go down
43CT016
Major contributor
Major contributor
43CT016


Call Sign : 43-CT-016
Posts : 298
Times Thanked : 20
Join date : 2019-11-17
QTH or Location : Perth
Equipment Used : iCom IC-7610/IC-9700

inverted l on 80 meters Empty
PostSubject: Re: inverted l on 80 meters   inverted l on 80 meters Icon_minitimeSun Oct 25, 2020 6:44 am

What length is the antenna radiating element, and do you have a way of measuring the feedpoint impedance?

You don't need a BALUN as you have an unbalanced antenna and unbalanced feedline, so what you really need is either a matching network or unun built to give you as close to 50 ohms impedance as possible from what it currently presents. 

For example, if it's a quarter wave, it'll present something like 20-30ohms.  If it's half wave and end-fed, it'll be thousands of ohms.  If it's a non-resonant length, a few hundred or so ohms....

Or have a misunderstood, and you're looking for a choke?

rabbi likes this post

Back to top Go down
rabbi
Senior contributor
Senior contributor



Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 133
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

inverted l on 80 meters Empty
PostSubject: Re: inverted l on 80 meters   inverted l on 80 meters Icon_minitimeSun Oct 25, 2020 7:52 am

hi thanks for your reply i have an mfj  i will be able to get some readings with it 80 meters and 40 meters does work thats the only 2 hf bands i use with it i have a ts 2000 x auto atu fitted and using an mfj auto tuner extenda get it to load up i live in teesside  and work into scotland and south uk 40 meters with  some continental europe  so it does work  i also use it for rx with icom 71e hf receiver with a global rx atu or a 4 to 1 balun in the shack the noise drops a lot with this balun  i will get back to you with the results from my mfj thanks for your help paul m0kbd stay safe do radio 73s

rabbi likes this post

Back to top Go down
The Doctor
Contributor
Contributor
The Doctor


Posts : 61
Times Thanked : 4
Join date : 2020-05-03
QTH or Location : Hertfordshire
Equipment Used : Uniden

inverted l on 80 meters Empty
PostSubject: Re: inverted l on 80 meters   inverted l on 80 meters Icon_minitimeThu Oct 29, 2020 9:26 pm

This is my current project.
I have never done this before so don’t be too tempted to follow me!

RG213 out of house and to the end of 75ft garden, buried approx 6” under the soil. Comes up and winds round a 4” diameter pipe, making a 1:1 choke (19ft 7” of coax). Then into 9:1 unun at base of polyweave inverted L.
Vertical section rises from 2’ to approx 20’, passes through dogbone insulator, 90 degree bend then horizontal run of approx 46’ to another dogbone where it terminates, suspended by loop of Kevlar paracord from K bracket on house.
The dogbone at the 90 degree bend is held up by paracord through a pulley, running down to a cleat hook (a giant washing line, in effect) allowing the whole aerial to be lowered and stashed along hooks on the fence.
The pole which supports the pulley is sprayed brown to camouflage against trees. (This is also telescopic but I don’t lower it).
From the unun ground, this weekend I will run several polyweave radials 2” under the surface of the lawn, fanning out under and away from the long wire.
At the unun end, these radials are connected to a stainless earthing terminal block, with one single 5” length connecting to the unun ground terminal.

It is basically a collapsible ~20m long inverted L, with buried counterpoise, 9:1 unun, and 1:1 choke to prevent common mode currents on the coax braid. Height above ground is 20’, giving height above sea level of 332’.
It offers 1/4 wave on 80m (well, that’s the plan.....).

Original plan was to double this length, making a V shaped wire, however weight v’s droop v’s visual appearance made me abandon this.

rabbi and Victor like this post

Back to top Go down
Northern Crusader
Major contributor
Major contributor



Call Sign : M0GVZ / 26CT1760
Posts : 488
Times Thanked : 32
Join date : 2019-11-13
QTH or Location : IO94SA
Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike
Age : 52

inverted l on 80 meters Empty
PostSubject: Re: inverted l on 80 meters   inverted l on 80 meters Icon_minitimeFri Nov 06, 2020 9:41 pm

I used to run an 80ft long inverted L, 25ft vertical section, the rest horizontal. I used a SGC230 antenna coupler at the antenna and used it on all bands from 160m to 10m and it worked great. You can use MFJ's Bias T to feed 12V to the SGC through the coax.

rabbi likes this post

Back to top Go down
rabbi
Senior contributor
Senior contributor



Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 133
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

inverted l on 80 meters Empty
PostSubject: Re: inverted l on 80 meters   inverted l on 80 meters Icon_minitimeSat Nov 07, 2020 9:05 pm

hi thanks for your replys the balun i made with coax is a 1.1 choke  i have a 9.balun i made with an amidon toroid while the lock down i will get out the mfj analiseir and take some readings i rig i use is a ts 2000x built in atu and an mfj  auto tuner extender thanks for looking stay safe do radio 73s paul m0kbd
Back to top Go down
Sponsored content





inverted l on 80 meters Empty
PostSubject: Re: inverted l on 80 meters   inverted l on 80 meters Icon_minitime

Back to top Go down
 
inverted l on 80 meters
Back to top 
Page 1 of 1
 Similar topics
-
» Pleased as Punch!
» Inverted-V Portable CB...
» INVERTED V OR DIPOLE
» Inverted V for 6 metres anyone?...just testing the water....
» Inverted V Dipole in Loft Vs T2LT outside?

Permissions in this forum:You cannot reply to topics in this forum
Charlie Tango 11m DX Radio Group Forum :: The Amateur Lounge :: Amateur Discussions-
Jump to: