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

 

 Inverted-V Portable CB...

Go down 
2 posters
AuthorMessage
Wireless
Senior contributor
Senior contributor
Wireless


Call Sign : 26-CT-4345 / M5WJF
Posts : 144
Times Thanked : 10
Join date : 2021-11-19
QTH or Location : Shrewsbury IO82OQ
Equipment Used : Albrecht AE-5890EU / Yaesu FT-847 + SGC-235/Dipole + V2000 + 4m Folded Dipole, Yaesu FT-100D + ATAS-120A, HF Transceiver? + Butternut HF-9V, Yaesu FT-8800R + 2/70 Whip, then Yaesu FT-90 / FT-727 and other stuff
Age : 56

Inverted-V Portable CB... Empty
PostSubject: Inverted-V Portable CB...   Inverted-V Portable CB... Icon_minitimeWed Dec 08, 2021 8:06 pm

OK, thinking about this.

With a 26ft telescopic mast with a drive on base support, using a 90 degree Inverted-V for DX, and calculating ~3.5% shorter legs for a target centre frequency of ~27.478 MHz, this would mean two legs of wire 5.264 metres using RG213 coax and a Dipole Centre Balun, which would need rope + egg insulators extending ~5.94 metres each leg to ground posts.

This would mean that the ends of each leg would be suspended 4.2 metres / 13ft 9in AGL, so meets EMC for 12 Watts SSB, and is well out of reach for Electrical Safety.

Anyone see any problems with this as a plan for DX Portable?

GaryWilson and Savwafare10 like this post

Back to top Go down
View user profile
26uk81
Senior contributor
Senior contributor



Call Sign : 26UK81
Posts : 105
Times Thanked : 1
Join date : 2020-06-06
QTH or Location : Oxford
Equipment Used : ss 6900N, AT5555N, President McKinley
Age : 37

Inverted-V Portable CB... Empty
PostSubject: Re: Inverted-V Portable CB...   Inverted-V Portable CB... Icon_minitimeThu Dec 09, 2021 8:00 pm

Sounds better than the one I once knocked up.   I made one with a square slap of timber and two plastic garden canes bolted through, and a piece of plastic drain pipe for mounting.   I set it up outside the caravan I was staying in Scotland.   Right by a lochside, set it up just a metre off the ground tied to a fence post.   I had pile ups every morning.

Savwafare10 and Wireless like this post

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


Call Sign : 26-CT-4345 / M5WJF
Posts : 144
Times Thanked : 10
Join date : 2021-11-19
QTH or Location : Shrewsbury IO82OQ
Equipment Used : Albrecht AE-5890EU / Yaesu FT-847 + SGC-235/Dipole + V2000 + 4m Folded Dipole, Yaesu FT-100D + ATAS-120A, HF Transceiver? + Butternut HF-9V, Yaesu FT-8800R + 2/70 Whip, then Yaesu FT-90 / FT-727 and other stuff
Age : 56

Inverted-V Portable CB... Empty
PostSubject: Re: Inverted-V Portable CB...   Inverted-V Portable CB... Icon_minitimeFri Dec 10, 2021 7:35 pm

I did consider the slightly cheaper 17ft Telescopic Mast, but losing 9ft in height this brings the ends of each antenna leg down to 4 ft 9 in (1.45 metres) AGL, and obviously someone could end up touching these.

Anyway, there's only £10 difference in a new Telescopic Mast of 17ft or 26ft, so it's a no brainer.

Savwafare10 likes this post

Back to top Go down
View user profile
Sponsored content





Inverted-V Portable CB... Empty
PostSubject: Re: Inverted-V Portable CB...   Inverted-V Portable CB... Icon_minitime

Back to top Go down
 
Inverted-V Portable CB...
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: