Posted: 4/13/2009 12:12:51 PM EDT
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I'm installing a 2m/70cm antenna in both the cars. What do I need to use this on my HT as well as the mobile? Just an SMA to SO-239 adapter? Is there some kind of antenna splitter so I don't have to unscrew it from the back of the mobile? What kind of strain does that put on the SMA connection of the HT? |
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Quoted: I'm installing a 2m/70cm antenna in both the cars. What do I need to use this on my HT as well as the mobile? Just an SMA to SO-239 adapter? Is there some kind of antenna splitter so I don't have to unscrew it from the back of the mobile? What kind of strain does that put on the SMA connection of the HT? Instead of an adapter, use a short cable and then you won't have to worry about undue stress on the connector.   |
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Quoted: I've been hunting around gigaparts for something like that. What's the official name? Found it: http://www.universal-radio.com/catalog/cable/4454.jpg I think I'll install an antenna switch so I'll probably need an SMA to PL-259 instead of SO-239. Why an antenna switch and not a diplexer, if I may ask? |
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I've been hunting around gigaparts for something like that. What's the official name? Found it: http://www.universal-radio.com/catalog/cable/4454.jpg I think I'll install an antenna switch so I'll probably need an SMA to PL-259 instead of SO-239. Why an antenna switch and not a diplexer, if I may ask? Diplexor separates bands to the different ports. It would work if you wanted 2m to the mobile and 440 to the HT for example. |
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Quoted: Quoted: Quoted: I've been hunting around gigaparts for something like that. What's the official name? Found it: http://www.universal-radio.com/catalog/cable/4454.jpg I think I'll install an antenna switch so I'll probably need an SMA to PL-259 instead of SO-239. Why an antenna switch and not a diplexer, if I may ask? Diplexor separates bands to the different ports. It would work if you wanted 2m to the mobile and 440 to the HT for example. If I was to put on the Grammar Nazi armband for just a moment, if a diplexer is used in that manner, it would be called a duplexer. A diplexer is used to have one radio transmit on multiple antennas. |
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I've been hunting around gigaparts for something like that. What's the official name? Found it: http://www.universal-radio.com/catalog/cable/4454.jpg I think I'll install an antenna switch so I'll probably need an SMA to PL-259 instead of SO-239. Why an antenna switch and not a diplexer, if I may ask? Diplexor separates bands to the different ports. It would work if you wanted 2m to the mobile and 440 to the HT for example. If I was to put on the Grammar Nazi armband for just a moment, if a diplexer is used in that manner, it would be called a duplexer. A diplexer is used to have one radio transmit on multiple antennas. No, a duplexor combines two frequencies on the same band into a common port. Typical use is for a repeater, where the receive and transmit frequencies are isolated from each other and connected to a common antenna (full duplex, hence the name duplexor). The requisite nature of duplexors is that they are frequency-specific in their tuning. A diplexor combines different frequency bands into a common port. Typically used to combine separate frequency band ports on a radio, or separate radios on different bands, into a common multiband antenna. Both devices are non-directional. A duplexor could be connected to a transceiver and send 146.520 to an antenna and 147.530 to a different antenna for example. Or the diplexor can split the common output from a radio to separate antennas for different bands. |
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Quoted: Quoted: Quoted: Quoted: Quoted: I've been hunting around gigaparts for something like that. What's the official name? Found it: http://www.universal-radio.com/catalog/cable/4454.jpg I think I'll install an antenna switch so I'll probably need an SMA to PL-259 instead of SO-239. Why an antenna switch and not a diplexer, if I may ask? Diplexor separates bands to the different ports. It would work if you wanted 2m to the mobile and 440 to the HT for example. If I was to put on the Grammar Nazi armband for just a moment, if a diplexer is used in that manner, it would be called a duplexer. A diplexer is used to have one radio transmit on multiple antennas. No, a duplexor combines two frequencies on the same band into a common port. Typical use is for a repeater, where the receive and transmit frequencies are isolated from each other and connected to a common antenna (full duplex, hence the name duplexor). The requisite nature of duplexors is that they are frequency-specific in their tuning. A diplexor combines different frequency bands into a common port. Typically used to combine separate frequency band ports on a radio, or separate radios on different bands, into a common multiband antenna. Both devices are non-directional. A duplexor could be connected to a transceiver and send 146.520 to an antenna and 147.530 to a different antenna for example. Or the diplexor can split the common output from a radio to separate antennas for different bands. I see my mistake, though you would need a duplexer to run two radios on one antenna. |
Can I ask another question about this? Why?  If you have a mobile unit in the vehicle, then why would you even want to use an HT on that same antenna? The mobile unit will always be more powerful and easier to use.
Now, if there is a good answer to the "why" question, I'd suggest a switch to toggle between radios. Out of one switch, add in that 239 to SMA pigtail and directly connect the mobile unit to the other. Its a simple solution. |
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I just wanted the flexibility to be able to run either or if I ever wanted to. An antenna switch is handy but you run the risk of transmitting into the switch with it in the wrong position if you're not careful. Quoted:
I see my mistake, though you would need a duplexer to run two radios on one antenna. Not if they are on different bands. Duplexor = in-band, diplexor (or triplexor, or quadplexor, etc) different bands. In the past I had three radios running into one coax/antenna through a triplexor. 6m, 2m, and 440 all running into a triband antenna. |
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I just wanted the flexibility to be able to run either or if I ever wanted to. Hmmm... Well, as Gamma762 has pointed out, there is a risk with that. If I were you (and I'm not), I would have the SMA adapter on hand just in case the mobile rig ever fails. If it does, do a direct plug into the antenna. Switches, diplexers, duplexers or anything else adds un-needed wires and complexity. Use the mobile whenever you can, but have the adapter just in case. |