Splitting an antenna

[jazzboypro]

Hello all,

I hope i am in the proper forum for this question. I currently have a single antenna (GP-3). This antenna is for the 144/432 bands. I want to use this antenna with an Icom IC-9700. This transceiver as 1 connector for 144 and another connector for 432. So i need a device that will allow me to connect a single antenna on 2 different connectors on the same radio.

I was looking at antenna switches but they appear to be used to connect multiple antennas to a single connector on a transceiver.

What would you recommend to accomplish my scenario ?

Many thanks

73

 

[K4EET]

Are you a ham? Will you be transmitting with this transceiver or just receiving?

<edit> I ask because it makes a BIG difference in how you might do this connection...

 

[PrivatelyJeff]

Hello all,

I hope i am in the proper forum for this question. I currently have a single antenna (GP-3). This antenna is for the 144/432 bands. I want to use this antenna with an Icom IC-9700. This transceiver as 1 connector for 144 and another connector for 432. So i need a device that will allow me to connect a single antenna on 2 different connectors on the same radio.

I was looking at antenna switches but they appear to be used to connect multiple antennas to a single connector on a transceiver.

What would you recommend to accomplish my scenario ?

Many thanks

73

You want a diplexer

 

[jazzboypro]

Are you a ham? Will you be transmitting with this transceiver or just receiving?

<edit> I ask because it makes a BIG difference in how you might do this connection...

My bad, i should have mention it. Yes i am (VA2FCS) and yes i will transmit.

 

[PrivatelyJeff]

My bad, i should have mention it. Yes i am (VA2FCS) and yes i will transmit.

look up diplexers. It’s a special type of splitter/combines that splits/combines by frequency. Connect each leg of the diplexer to the appropriate connector on the radio and the antenna to the feed connection on it.

 

[K4EET]

I believe you should be looking at a Comet Antennas CFX-4310C or equivalent since you actually have three connectors on an Icom IC-9700. That way you are "future-proof" and you have all of your ports terminated although your antenna might not have a 1.2 GHz band. I am not familiar with a GP-3 antenna.

<edit> If you cannot find a Canadian supplier of that part, GigaParts in the States has the part. You will also have to mate the N connector on the Icom's 440 MHz port to the UHF connector on the Comet. I think I have all of that right now. LOL! (enough edits!) Not sure what is on the antenna. Final note is that this all assumes you do not have an outboard amplifier. Watch the specs of the Comet.

 

[iMONITOR]

Another option:

MX3000N Diamond Triplexer

Specifications:

• Port: LPF/BPF/HPF
• Frequency (MHz): 1.6-160/350-500/850-1300
• CW W: 400/200/100
• PEP W: 800/400/200
• Loss dB: .2/.3/.4/
• Isol dB: 55/55/55
• Mix Connector: N-Jack (F)
• Port connector: PL-259 & 12" 5D cable/N-Male & 12" 5D cable/N-Male & 12" 5D cable

 

[K4EET]

Thanks for chiming in @iMONITOR. I made a real mess on my response. I took a simple device and made a complex response and got myself all tongue-twisted! I should have formatted my response like your response. It would have been a lot easier to decipher. My bad. Sorry @jazzboypro

 

[iMONITOR]

Thanks for chiming in @iMONITOR. I made a real mess on my response. I took a simple device and made a complex response and got myself all tongue-twisted! I should have formatted my response like your response. It would have been a lot easier to decipher. My bad. Sorry @jazzboypro

Nothing wrong with your post K4EET. I value your post as they reflect years of experience and ideas! I only chimed in with an alternative in case he couldn't find the Comet device.

You want to talk about making a mess of a post, how many have I messed up. Buy hey we try to help people when we can and that's what it's all about. Usually people figure out what we meant to say. Sometimes I see what I posted a couple of days and I'm like what was I thinking?

 

[jazzboypro]

Thanks for chiming in @iMONITOR. I made a real mess on my response. I took a simple device and made a complex response and got myself all tongue-twisted! I should have formatted my response like your response. It would have been a lot easier to decipher. My bad. Sorry @jazzboypro

Your answer was quite clear actually. Thanks for pointing me in the right direction and for suggesting a vendor.

73
Sylvain

 

[jazzboypro]

Another option:

MX3000N Diamond Triplexer
View attachment 96605
Specifications:

• Port: LPF/BPF/HPF
• Frequency (MHz): 1.6-160/350-500/850-1300
• CW W: 400/200/100
• PEP W: 800/400/200
• Loss dB: .2/.3/.4/
• Isol dB: 55/55/55
• Mix Connector: N-Jack (F)
• Port connector: PL-259 & 12" 5D cable/N-Male & 12" 5D cable/N-Male & 12" 5D cable

Thanks iMONITOR, this looks like what need. The one suggested by K4EET is pretty good also, but the Diamond comes with the cables already there so i will go for that one.

Many thanks.

73
Sylvain

 

[sallen07]

Thanks iMONITOR, this looks like what need. The one suggested by K4EET is pretty good also, but the Diamond comes with the cables already there so i will go for that one.

I would suggest you look at either the Comet CF-416B or CF-416C. They both come with an N connector for UHF and PL-259 for VHF, which will connect to your IC-9700 without needing an adapter. The Diamond one has N connectors for both UHF and VHF, and you really don't need a triplexer. The B has an SO-239 for the antenna connection and the C has a female N connector.

If you are planning to do 1200 MHz work then I'd consider the CF-416W. You'll need an adapter if your antenna lead has a SO-239.

 

[jazzboypro]

I would suggest you look at either the Comet CF-416B or CF-416C. They both come with an N connector for UHF and PL-259 for VHF, which will connect to your IC-9700 without needing an adapter. The Diamond one has N connectors for both UHF and VHF, and you really don't need a triplexer. The B has an SO-239 for the antenna connection and the C has a female N connector.

If you are planning to do 1200 MHz work then I'd consider the CF-416W. You'll need an adapter if your antenna lead has a SO-239.

Thanks for your suggestion but according to the specs for the MX-3000N the connectors are Ok and it matches the connectors in the back of my IC-9700


Manufacturer's Part Number:MX3000N

Part Type:Duplexers and Triplexers

Product Line:Diamond Antenna Triplexers

DXE Part Number:DMN-MX3000N


Low Pass Frequency Coverage:1.6-160 MHz

Mid Pass Frequency Coverage:350-500 MHz

High Pass Frequency Coverage:850-1300 MHz

Low Pass Loss:0.2 dB

Mid Pass Loss:0.3 dB

High Pass Loss:0.4 dB

Low Pass PEP:800 watts

Mid Pass PEP:400 watts

High Pass PEP:200 watts

Isolation:55 dB

Mix Connector:Type N, female

Low Pass Port Connector Type:UHF male, PL-259

Mid Pass Port Connector Type:Type N, male

High Pass Port Connector Type:Type N, male

 

[sallen07]

Deleted. After I had the cluestick applied to me!

 

[AK9R]

Since your IC-9700 has *two* antenna connectors, one for UHF and one for VHF?

It has three. The IC-9700 works on 2m (UHF connector), 70cm (N), and 23cm (N).

 

[iMONITOR]

My bad. I saw "N" and assumed they were all N. We know what they say about assuming!

But you still don't need a triplexer, right? Since your IC-9700 has *two* antenna connectors, one for UHF and one for VHF?

It has three. One SO-239 and two Type N connectors:

 

[sallen07]

It has three. The IC-9700 works on 2m (UHF connector), 70cm (N), and 23cm (N).

LOL. OK I'm just going to go crawl under a rock for the rest of today.

I started looking at the specs and saw "SO-259 for VHF, N for UHF" and stopped reading. Doh!

"Never Mind"

 

[iMONITOR]

LOL. OK I'm just going to go crawl under a rock for the rest of today.

I started looking at the specs and saw "SO-259 for UHF, N for VHF" and stopped reading. Doh!

"Never Mind"

Been there, done that! Time for coffee...

 

[WA0CBW]

Also some manufacturers mistakenly call them "duplexers"