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

11m Winter Challenge, 1st December - 31st March. Details in DX Lounge. Join us now..........
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
» New member
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 10:14 pm by John123

» Call sign
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 10:12 pm by John123

» HF Contacts 10m
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 6:27 pm by Bean

» HF 160m Contacts
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 5:33 pm by Victor

» marine antenna
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 5:04 pm by skyrider

» New station
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 1:14 pm by Alan Pilot

» 11m conditions
CB antenna/ PMR antenna compatibility question. Icon_minitimeToday at 9:08 am by Cozzmik

» 11m Challenge Scores Only
CB antenna/ PMR antenna compatibility question. Icon_minitimeYesterday at 9:00 pm by Kaosss

» mag mount
CB antenna/ PMR antenna compatibility question. Icon_minitimeYesterday at 4:49 pm by GaryWilson

Keywords
president Sirio 2022 sign callsign call midland yaesu lincoln list Calling ALINCO 9900 frequency ss9900 SS6900 antenna Mckinley radio display chart Mobile 6900 anytone Baofeng power
QRZ Database

 

 CB antenna/ PMR antenna compatibility question.

Go down 
+5
stephen Gunrunner
Victor
Razz229
GaryWilson
Sharpshooter
9 posters
Go to page : 1, 2  Next
AuthorMessage
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeThu May 26, 2022 10:43 pm

I have purchased a large magmount with my Sirio 4000 antenna which I hope to set up soon with a CRT SS 9900.

 I also have a small PMR magmount antenna fitted to the roof of my car that is probably useless. 
I'm wondering if the Sirio would work on PMR ?
If not, is there an aerial I could buy to screw onto the magmount ?
 I'm thinking of getting a CRT space U so it would be handy to use the existing twig or if not just swop over on the same mount.

Chickenfoot@1987 likes this post

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


Call Sign : 26-CT-1836 Ham 2E0GGQ
Posts : 3493
Times Thanked : 285
Join date : 2019-06-27
QTH or Location : Braunston Northamptonshire.
Equipment Used : Radios & Wires & Stuff!
Age : 57

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeFri May 27, 2022 10:44 pm

Hello, no unfortunately you need the right antenna for the frequency in use. C.B is a HF frequency 27Mhz and PMR is UHF 446MHZ you need another antenna for PMR there's loads out there on the market.

73's Gary.

Victor and Sharpshooter like this post

Back to top Go down
View user profile https://www.qrz.com/db/2E0GGQ Online
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeFri May 27, 2022 11:27 pm

Thanks Gary, I thought so unfortunately.
Is there an antenna I could buy to fit the magmount ?
Back to top Go down
View user profile
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat May 28, 2022 8:46 am

Hi Sharpshooter

What mag mount have you got? 
Is it a SO239 or a 3/8 tread connection?

Will you be using it while driving or parked up?

Because I can't see a problem with buying an adaptor so you could swap antenna's over but use the same mag mount.

73
Ray

Victor and Sharpshooter like this post

Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat May 28, 2022 4:17 pm

Hi Ray, I've got the Sirio Mag 145 PL.
RG58 coax and PL 259 plug to SO239 .

It's the connection for the antenna to the magmount I'm wondering about . (Or is that the same? )
So I could change from the Sirio 4000 whip to a PMR one on the same magmount.
Cheers.

GaryWilson 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 : 3694
Times Thanked : 222
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat May 28, 2022 5:15 pm

Sirio do an adapter for the mag mount as Ray pointed out.

Search Google for "Sirio PL Mag to 3/8" and you'll get a ton of hits.

Then you can unplug the Sirio antenna from the mag mount base and screw in a 3/8ths PMR antenna via the adapter. CB antenna/ PMR antenna compatibility question. 1f44d


73
Victor

GaryWilson, Razz229 and Sharpshooter like this post

Back to top Go down
View user profile https://www.qrz.com/db/M7VIC
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat May 28, 2022 5:23 pm

.
I've been beaten by Victor 😆😆

I was going to offer this up

Up until I got my £1 mag mount from a radio rally, I was going to get a Sirio SO239 to 3/8" adaptor and then fit a 3/8" whip adaptor with bike wheel spoke cut to about 17cm.
I can then use my Sirio mag mount for both CB & PMR.

Yes there will be some coaxial loss but you will see an improvement on TX & RX, on a UV5R (or any hand held) over a rubber duck antenna.

Ray

GaryWilson, Victor, Tristar and Sharpshooter like this post

Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat May 28, 2022 6:07 pm

Ok thanks all.
Sorry, it's not really for the UV5R.
I'm thinking of buying a CTR space U from Knights.
They do a Sirio PMR antenna for £14 and a Nagoya for £18 with magmount.
Also the Nagoya is £15 if bought with the radio.

https://www.kcb.co.uk/contents/en-uk/p2037_Sirio_SU_375-480PL__(375-480mHz).html

https://www.kcb.co.uk/contents/en-uk/p2038_Nagoya_UT-72_U_V_Mag_Mount__(2m_70cm).html
Back to top Go down
View user profile
stephen Gunrunner
Major contributor
Major contributor
stephen Gunrunner


Call Sign : 26CT526/MR021/M6XXX.
Posts : 247
Times Thanked : 10
Join date : 2019-06-27
QTH or Location : wooler north northumberland or some were near it
Equipment Used : mobile 4000hp base A99 radio base magnum257hp mobile magnum 257 standed power
Age : 65

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSun May 29, 2022 1:13 pm

make your self a pmr antenna there not hard to make you need a 3/8 mag and a 3/8 fitting and a steel whip and cut it and measure from the base of 3/8 whip holder 16cm and thats if the whip is to thick drill out the whip holder,and fit it to the 3/8 mag mount check the transmission one they have whip lenths and i got a crt space and it works great 20 miles from my bro he was shouting for me, i was mobile and i heard him so stopped at a little car park at 900 ft asl. and had a great contact such a small antenna, and it works this is what we used to do years ago with the cb, and now we are using pmr, and lots of time we can not hear the cb, but hear the pmr i like my cb but i love the pmr harder contact but a satisfaction with the pmr, am i mad no not never but just feel great getting the great pmr contacts,.


Last edited by stephen Gunrunner on Mon May 30, 2022 12:26 pm; edited 1 time in total

Sharpshooter likes this post

Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSun May 29, 2022 5:18 pm

Thanks very much for all the replies.
I see knights do the adaptor for £8.45.

So are most CB antenna connections SO239 and PMR 3/8" ?


Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSun May 29, 2022 5:38 pm

Razz229 wrote:
.
I've been beaten by Victor 😆😆

I was going to offer this up

Up until I got my £1 mag mount from a radio rally, I was going to get a Sirio SO239 to 3/8" adaptor and then fit a 3/8" whip adaptor with bike wheel spoke cut to about 17cm.
I can then use my Sirio mag mount for both CB & PMR.

Yes there will be some coaxial loss but you will see an improvement on TX & RX, on a UV5R (or any hand held) over a rubber duck antenna.

Ray


Why 17cm Ray ? 
Is that for swr ?
I take it CB swr meters don't work on the PMR frequency ?
Back to top Go down
View user profile
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSun May 29, 2022 8:22 pm

Sharpshooter wrote:
Razz229 wrote:
.
I've been beaten by Victor 😆😆

I was going to offer this up

Up until I got my £1 mag mount from a radio rally, I was going to get a Sirio SO239 to 3/8" adaptor and then fit a 3/8" whip adaptor with bike wheel spoke cut to about 17cm.
I can then use my Sirio mag mount for both CB & PMR.

Yes there will be some coaxial loss but you will see an improvement on TX & RX, on a UV5R (or any hand held) over a rubber duck antenna.

Ray


Why 17cm Ray ? 
Is that for swr ?
I take it CB swr meters don't work on the PMR frequency ?

I use a home made antenna for most of my PMR contacts and the whip is cut to about 16.7cm. This is about the length for a 1/4 wave antenna tuned to channel 8 PMR, which gives me a SWR of 1:1 & a reading of 52 ohms on a Nano VNA Analyzer 
Yes you would need a UHF/VHF SWR meter.

73
Ray

Sharpshooter likes this post

Back to top Go down
View user profile
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeThu Jun 02, 2022 12:04 pm

Hi all

So putting money were my mouth is. 

I thought I would make a PMR antenna that would work on a CB mag mount. 

This is more a proof of concept and before anybody points it out, yes I know the coax is not ideal.

The 1st picture shows what I'm going to be working with.
A metal coat hanger, a 3/8" whip adaptor, and a 7" mag mount of dubious quality.

CB antenna/ PMR antenna compatibility question. 20220610

The 2nd picture shows the approximate length of the whip once cut down.

CB antenna/ PMR antenna compatibility question. 20220611

3rd picture shows the mount assembled and on an old biscuit tin 😆

CB antenna/ PMR antenna compatibility question. 20220612

4th picture show the sacrificial radio if it all goes wrong.

CB antenna/ PMR antenna compatibility question. 20220617

And the last picture shows the SWR reading while transmitting 

CB antenna/ PMR antenna compatibility question. 20220618

So it seems to work as it's showing no reflective power. 

Now I invite those with more knowledge to improve, my proof of concept

Cheers for reading

Ray

Victor, SangueG and Sharpshooter like this post

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



Posts : 350
Times Thanked : 12
Join date : 2021-11-19
QTH or Location : Shrewsbury
Equipment Used : kit

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeThu Jun 02, 2022 1:23 pm

I did similar with wire, and also cut a mobile whip for 4m for use with an Ascom SE550, but I did invest in an Antenna Analyser to check the SWR before connecting up a transceiver, good idea, not sure it meets type approval for PMR446, but whose to know?  Next would be a 70cms Linear Amplifier...

Update: The 25 Watt Icom IC-F210 here is programmed with 16x PMR446 Channels, obviously TX is inhibited for those worried about type approval...


Last edited by Wireless on Sat Jun 11, 2022 1:59 pm; edited 1 time in total
Back to top Go down
View user profile
Victor
CT Directors
CT Directors
Victor


Call Sign : 26-CT-3228 Ham M7VIC
Posts : 3694
Times Thanked : 222
Join date : 2019-11-10
QTH or Location : Bedford
Equipment Used : Various

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeThu Jun 02, 2022 2:50 pm

Great stuff there Ray and a really good 'show and tell' mate. CB antenna/ PMR antenna compatibility question. 1f44d

Good little 1/4 wave that does the job and often better than the standard 'rubber duck' as well as some dubious Chinese teeny mag mount affairs.

As metal wire type coat hangers are thin on the ground nowadays I suggest everyone looks out for a missing wheel spoke the next time they are out on their bicycle - some PMR nut may have nicked it!! Very Happy



Worthy of a 'Thanks'. Wink

Razz229 and Sharpshooter like this post

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


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeThu Jun 02, 2022 5:44 pm

Razz229 wrote:
Hi all

So putting money were my mouth is. 

I thought I would make a PMR antenna that would work on a CB mag mount. 

This is more a proof of concept and before anybody points it out, yes I know the coax is not ideal.

The 1st picture shows what I'm going to be working with.
A metal coat hanger, a 3/8" whip adaptor, and a 7" mag mount of dubious quality.


The 2nd picture shows the approximate length of the whip once cut down.


3rd picture shows the mount assembled and on an old biscuit tin 😆


4th picture show the sacrificial radio if it all goes wrong.


And the last picture shows the SWR reading while transmitting 


So it seems to work as it's showing no reflective power. 

Now I invite those with more knowledge to improve, my proof of concept

Cheers for reading

Ray



Interesting Ray as I was considering this old antenna I have.

A cheaper option but then I don't want two magmounts on the roof.
(I see yours has seen better days, do you live by the sea ? Very Happy )

Question, does the PMR not need a base loading coil like a CB ?

Cheers Nige.

CB antenna/ PMR antenna compatibility question. Img_2021
Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeThu Jun 02, 2022 5:50 pm

Victor wrote:
Great stuff there Ray and a really good 'show and tell' mate. CB antenna/ PMR antenna compatibility question. 1f44d

Good little 1/4 wave that does the job and often better than the standard 'rubber duck' as well as some dubious Chinese teeny mag mount affairs.

As metal wire type coat hangers are thin on the ground nowadays I suggest everyone looks out for a missing wheel spoke the next time they are out on their bicycle - some PMR nut may have nicked it!! Very Happy



Worthy of a 'Thanks'. Wink


I'll just nip to the local bike shop. I'm sure he'll give me an old spoke 👍🤣
Or I could just cut down the existing twig as it seems short anyway 👍

Razz229 and Victor like this post

Back to top Go down
View user profile
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeFri Jun 03, 2022 12:12 pm

Victor wrote:
Great stuff there Ray and a really good 'show and tell' mate. CB antenna/ PMR antenna compatibility question. 1f44d

Good little 1/4 wave that does the job and often better than the standard 'rubber duck' as well as some dubious Chinese teeny mag mount affairs.

As metal wire type coat hangers are thin on the ground nowadays I suggest everyone looks out for a missing wheel spoke the next time they are out on their bicycle - some PMR nut may have nicked it!! Very Happy



Worthy of a 'Thanks'. Wink

Cheers Victor 👍

The next step I guess, is to 'prove' if there is any improvement in the real world, over the whip antenna on my UV5R. So watch this space for a comparison video.

You can't go wrong with a meatal coat hanger. They have, over the years, proven to be a great receive antenna when bent into a diamond 🔶 and used to replace a broken car aerial 😆

When you look around, there must be that old rusty bike 🚲 sitting in the front/back garden of the family where the children have out grown it.
Now look at the spokes and think elements for a PMR beam (but that is for another time) 😆😉

73

Victor and Sharpshooter 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 : 1833
Times Thanked : 47
Join date : 2019-11-19
QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeFri Jun 03, 2022 12:42 pm

Linda got me wire coat hangers from B&M I think it was 5 for £1 and not long ago.

Razz229, Victor and Sharpshooter like this post

Back to top Go down
View user profile
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeFri Jun 03, 2022 12:56 pm

Sharpshooter wrote:
Razz229 wrote:
Hi all

So putting money were my mouth is. 

I thought I would make a PMR antenna that would work on a CB mag mount. 

This is more a proof of concept and before anybody points it out, yes I know the coax is not ideal.

The 1st picture shows what I'm going to be working with.
A metal coat hanger, a 3/8" whip adaptor, and a 7" mag mount of dubious quality.


The 2nd picture shows the approximate length of the whip once cut down.


3rd picture shows the mount assembled and on an old biscuit tin 😆


4th picture show the sacrificial radio if it all goes wrong.


And the last picture shows the SWR reading while transmitting 


So it seems to work as it's showing no reflective power. 

Now I invite those with more knowledge to improve, my proof of concept

Cheers for reading

Ray



Interesting Ray as I was considering this old antenna I have.

A cheaper option but then I don't want two magmounts on the roof.
(I see yours has seen better days, do you live by the sea ? Very Happy )

Question, does the PMR not need a base loading coil like a CB ?

Cheers Nige.

CB antenna/ PMR antenna compatibility question. Img_2021
Hi Nige

Glad you liked the "show & tell" and found it interesting. 👍

Does your Sirio mag mount have this style of connection?

CB antenna/ PMR antenna compatibility question. 20220619

Then I would go with the earlier suggestion of a SO259 to a 3/8" adaptor and 3/8" to whip adaptor with the cut down coat hanger, bike spoke, metal rod. 

2 antennas and 1 mount 😀

The mag mount I show is over 10 years old and I have had to re-solder the coax to the mount due to corrosion 😟

Short answer, no the antenna I show is a 1/4 wave and doesn't need any loading coil, which keeps it simple and cheap to make.

Cheers

Ray

Victor likes this post

Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeFri Jun 03, 2022 2:19 pm

Hi Ray.
Yes the Sirio Magmount is the SO259 .

I'll get a Sirio SO259 to 3/8th, and a 3/8th to 2.5mm whip, and also the PL259 to SMA female for into a Baofeng 👍

I can test the waters on PMR with the UV5R then first before buying a CRT space U,

Simple and cheap to make ? It'll work out more expensive than buying a PMR antenna with magmount 👍🤣

Thanks for all the advice etc all. Much appreciated.

Razz229 likes this post

Back to top Go down
View user profile
Razz229
Major contributor
Major contributor
Razz229


Call Sign : 26 CT 2290 & 26 CI 2290
Posts : 457
Times Thanked : 17
Join date : 2019-07-01
QTH or Location : Kent
Equipment Used : On 11m a Anytone 6666, Solarcon A99 vertical antenna or a Sirio 4000. On PMR a TYT TH-9800, a 1/4 wave GPA, homemade mag mount & sometimes a 8 element beam.
Age : 54

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat Jun 11, 2022 1:54 pm

Get a Sirio SU375-480 PL antenna. 

Cut it down for PMR, Sirio supply the instructions, then you can use the same mount.

I think this fulfils all of your requirements.

Chickenfoot@1987 and Sharpshooter like this post

Back to top Go down
View user profile
Sharpshooter
Major contributor
Major contributor
Sharpshooter


Call Sign : 163-CT-329
Posts : 226
Times Thanked : 10
Join date : 2022-04-05
QTH or Location : Deeside
Equipment Used : CRT SS 9900, Ranger 2950DX Sirio 4000, Midland portable, Manor Kestrel, CRT space U, UV5R's x2,

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSat Jun 11, 2022 9:14 pm

Razz229 wrote:
Get a Sirio SU375-480 PL antenna. 

Cut it down for PMR, Sirio supply the instructions, then you can use the same mount.

I think this fulfils all of your requirements.

Thanks Razz.
I was just trying to order this from Knights along with a PL to SMA adaptor .
But I can't work out how to add a second hand swr/pwr meter so I'm going to ring them Monday to order everything.
Cheers 👍

Razz229 likes this post

Back to top Go down
View user profile
BigTone
Contributor
Contributor



Call Sign : G8YMW or 26CT4498
Posts : 88
Times Thanked : 17
Join date : 2019-07-16
QTH or Location : Lincoln and Finningley
Equipment Used : CRT 9900, Icom 705, Kenwood TS570, Icom 910
Age : 67

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeSun Jun 19, 2022 5:21 pm

For PMR the magmount will be perfect.
You could use a 2m/70cms amateur radio aerial.
Or roll your own. A PL259 and a a length of brazing rod.
Solder the rod to the centre of the PL259, pack the gap between the rod and the body of the PL259 with epoxy.
Trim the rod to best swr (about 6")

Sharpshooter likes this post

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



Posts : 350
Times Thanked : 12
Join date : 2021-11-19
QTH or Location : Shrewsbury
Equipment Used : kit

CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitimeMon Jun 20, 2022 10:15 am

Sharpshooter wrote:
Razz229 wrote:
Get a Sirio SU375-480 PL antenna. 

Cut it down for PMR, Sirio supply the instructions, then you can use the same mount.

I think this fulfils all of your requirements.

Thanks Razz.
I was just trying to order this from Knights along with a PL to SMA adaptor .
But I can't work out how to add a second hand swr/pwr meter so I'm going to ring them Monday to order everything.
Cheers 👍

Just Get a Diamond MC-200 or MC-201 Kit, both come complete with a Cutting Chart that cover PMR446.

Sharpshooter likes this post

Back to top Go down
View user profile
Sponsored content





CB antenna/ PMR antenna compatibility question. Empty
PostSubject: Re: CB antenna/ PMR antenna compatibility question.   CB antenna/ PMR antenna compatibility question. Icon_minitime

Back to top Go down
 
CB antenna/ PMR antenna compatibility question.
Back to top 
Page 1 of 2Go to page : 1, 2  Next
 Similar topics
-
» Mobile antenna question
» Returning to the fold - antenna question
» PMR446 antenna near freeview aerial question
» Application for a Charlie Tango callsign (Issued)
» Superstar 95 ???

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: