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two radios and one antenna tuner and antenna

#ubitx-v6

splat1956 All Messages By This Member #100688 Hi Now that I have the ubitx 6 working great I would like to connect it to my antenna tuner and then to the antenna as a second radio. I want to be able to use the Icom or ubitx (but only one at a time)? without having to plug and unplug cables all the time. I have seen several youtube videos saying that you can usually hook two radios to a coax switch with one outgoing cable to the antenna tuner and then antenna. The videos talk about isolation between the ports and suggest that there is enough isolation to avoid radio damage. I dont see anyone reporting radio damage. Has anyone hooked a ubitx v6 to a coax switch and run a 100 watt radio thru the other port without damaging the ubitx v6 ? Would hate to brick the ubitx just for convenient hookup ! thanks David W9PH
Richard Spohn All Messages By This Member #100691 I avoid possible radio damage by using a bnc patchbay instead of switches. Bnc connectors are much quicker and more convenient to use than most other types of rf connectors such as pl259s-so239s. -- Rich WB2GXM toggle quoted message Show quoted text ------ Original message------ From: splat1956 Date: Tue, Mar 28, 2023 4:19 PM To: [email protected]; Cc: Subject:[BITX20] two radios and one antenna tuner and antenna #ubitx-v6 Hi Now that I have the ubitx 6 working great I would like to connect it to my antenna tuner and then to the antenna as a second radio. I want to be able to use the Icom or ubitx (but only one at a time)? without having to plug and unplug cables all the time. I have seen several youtube videos saying that you can usually hook two radios to a coax switch with one outgoing cable to the antenna tuner and then antenna. The videos talk about isolation between the ports and suggest that there is enough isolation to avoid radio damage. I dont see anyone reporting radio damage. Has anyone hooked a ubitx v6 to a coax switch and run a 100 watt radio thru the other port without damaging the ubitx v6 ? Would hate to brick the ubitx just for convenient hookup ! thanks David W9PH
Gordon Gibby KX4Z All Messages By This Member #100692 开云体育 One. If you have made the diode modification that I recommended so many years ago to protect Q 90, in early versions this isn’t much of an issue. ?Otherwise yes, you might will blow something. Because you will eventually blow that transistor if it remains unprotected I haven’t looked at the schematics of the later versions so I don’t know what’s going on there. ?The original design acted like a RF power supply to reverse bias the base emitter junction and eventually blow it. ? Anytime you have a diode and what turns out to be a “power supply “there is a requirement for a certain reverse voltage capability. ?If there’s a capacitor in series with a diode you have built a power supply! Think about it Two. ?At our emergency operation center we have three HF transceivers connected with a single coax switch to our output system. ? There are different varieties of coax which is, some with better isolation than others, we have done fine but you might wish to get one that grounds the unused ports.? Gordon Kx4z? toggle quoted message Show quoted text On Mar 28, 2023, at 22:27, Richard Spohn <wb2gxm@...> wrote: ? I avoid possible radio damage by using a bnc patchbay instead of switches. Bnc connectors are much quicker and more convenient to use than most other types of rf connectors such as pl259s-so239s. -- Rich WB2GXM ------ Original message------ From: splat1956 Date: Tue, Mar 28, 2023 4:19 PM To: [email protected]; Cc: Subject:[BITX20] two radios and one antenna tuner and antenna #ubitx-v6 Hi Now that I have the ubitx 6 working great I would like to connect it to my antenna tuner and then to the antenna as a second radio. I want to be able to use the Icom or ubitx (but only one at a time)? without having to plug and unplug cables all the time. I have seen several youtube videos saying that you can usually hook two radios to a coax switch with one outgoing cable to the antenna tuner and then antenna. The videos talk about isolation between the ports and suggest that there is enough isolation to avoid radio damage. I dont see anyone reporting radio damage. Has anyone hooked a ubitx v6 to a coax switch and run a 100 watt radio thru the other port without damaging the ubitx v6 ? Would hate to brick the ubitx just for convenient hookup ! thanks David W9PH
splat1956 All Messages By This Member #100699 This may sound ignorant and if so, I apologize, but how does the power from one transmitter get into the second radio if the switch is disconnecting the second radio from the transmitting radio? If it is an induced current from nearby, coaxial cable, then the switch probably doesn’t make much difference in my case, since I currently have both cables ( icom and ubitx) next to one another, in order to plug them into the antenna tuner depending on which radio I’m going to use. If it’s really coming from the switch, then it may be better to keep the cables separate and plug the cables in when in use but if its from the cables being close to one another or the radios being adjacent to one another then I have already been using them next to one another. Just wondering if anyone knows the possible source of the problem. Thanks, David.?

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