Connect TWO (or Three) Radios To ONE Antenna

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Күн бұрын

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@robertmeyer4744 4 ай бұрын

Great video. I found a problem in a setup using triplexer and diplexer before. If using a radio with harmonics .They easy travel to outher radio .A outher reason to to check each radio for harmonics. They can desensitize the outher radio . Also using a band pass filter on each radio improves isolation a whole bunch. Like on set up with 6 meter split to VHF/UHF . If you put a band pass filter on each radio that slight cross over will disappear. Also a band pass filter helps with harmonics out of band. Each set up is different , results will very a bunch between setups , coax can cross talk . Copper foil shield the best . Separating coax helps as well. Lots that can mess things up. 73

@HamRadioDX 4 ай бұрын

Yes great tips Robert!

@VK2AAK 4 ай бұрын

It's well worth reading the specs and also checking the actual isolation of some of the cheaper diplexers. There's significant evidence of users blowing the preamps of their IC-9700s using a diplexer to run into a single antenna. I measured a diplexer I bought and despite the specs stating it had >60dB isolation, the Siglent spectrum analyser revealed that it had well under 50dB. I was able to improve things by squashing and expanding inductors but still couldn't get it better than 60dB.

@virtual812 4 ай бұрын

Got me concerned now! I'd love to test my triplexer, the Diamond MX-3000N I'm kinda struggling mentally on how to go about it. I have a NANO VNA and a TinySA, but i can't generate a signal with the TinySA. I guess i could just connect the triplexer to the 9700 and put out 10 watts on 2M while measuring what appears on the other ports... is this the way? Any suggestions?

@VK2AAK 4 ай бұрын

⁠@@virtual812 It would be difficult to measure the output from the triplexer as it won't register on something like a power/SWR meter. It really needs something like a calibrated spectrum analyser to check that the unit meets its specs.

@k6usy 4 ай бұрын

The 3 antenna ports on my IC-9700 go to antenna switches for each band, one of the ports on each switch goes to a triplexer. This allows me to use my triband vertical or switch to horizontal antennas for each band.

@mediocreman2 3 ай бұрын

Nice Kenwood HT!

@regularguy519 4 ай бұрын

Was looking for the solution. Thank you.

@HamRadioDX 4 ай бұрын

No problem 👍

@M0JSX 4 ай бұрын

Great video Hayden. I do the same thing as you (but with a diplexer). 50MHz into the IC-7300 and 144/430MHz into either the FT-8900 (For FM working), or the IC-705 if I want some SSB/FT8.

@HamRadioDX 4 ай бұрын

Thanks Jonathan, that’s the way to go 👍 What antenna?

@M0JSX 4 ай бұрын

@@HamRadioDX v2000 same as you. As if there is a different choice?

@KF0NNQ 4 ай бұрын

For 70cm and 2m on a HT, just use the same ant. Yes, mobiles at higher watts might be different. My QHT mobile for dual band drive a homemade 2m HV dipole. SWR on both bands is in the dirt.

@KA9DSL 4 ай бұрын

Hello, I've got 3 Bridgecom repeaters on a CX-333 antenna. I'm using a Austin Triplexer. System running about 25 watts each. Works well, the duplexers were all carefully tuned, so far no interaction. Two of the three have RF circulators.

@FEPLabsRadio 4 ай бұрын

What Hollywood said - great demo!

@LeeMcc_KI5YPR 4 ай бұрын

My triplexer splits one antenna to 2m (2m-only radio), 70cm (hotspot), and 33cm (sdr-trunk). Much better than moving cables around.

@Subgunman 3 ай бұрын

Now one needs to find a multi band antenna. There was a company called Niljon which made an antenna that went from 100-500MHz. I have one and it works great BUT they were bought out by a company that makes multi and antennas for the military and government groups. Price wise for a similar antenna went triple the cost almost overnight and they do not like selling to the general public.

@WECB640 4 ай бұрын

Excellent presentation. 👍

@HamRadioDX 4 ай бұрын

Thank you!

@keyoflife24 11 күн бұрын

Is there a way to duplex uhf on both sidesa

@barhom2861 3 ай бұрын

Great video, I’m looking for other scenario I have Kenwood d-710 and I need to use repeater mood so the Rx antenna will be 400 MHZ and the TX will be 144 MHZ. Is to possible?

@jordanseitzinger3167 27 күн бұрын

what if I want to use my uhf radio and scanner on one antenna. they are on the same band. is there a diplexer than does 300-900 on both inputs?

@DonzLockz 4 ай бұрын

Good info and testing Hayden.👍🤠

@HamRadioDX 4 ай бұрын

Thanks Don 👍

@temporarilyoffline 4 ай бұрын

I've been wondering, but no more.

@Wayne-Pr 4 ай бұрын

Great video Hayden. You were going to talk about loss but I think it got missed. Wayne VK3ECS

@JamieStuff 4 ай бұрын

You're not quite right on the duplexer/diplexer issue. A duplexer allows simultaneous transmit and receive on one antenna. (Duplex communications.) A diplexer combines two transmitters or two receivers to one antenna. Broadcast facilities use these to put multiple stations on one antenna, saving tower space. So, the two port devices you had are correctly marked as duplexers. Of course, this could also be a US/VK language difference.

@HamRadioDX 4 ай бұрын

No, it's a universal thing and I was right on the duplexer/diplexer naming. Here's more info: www.repeater-builder.com/antenna/ant-sys-duplexers.html

@steven-george 4 ай бұрын

Instead of a diplexer giving -50dB of isolation, what if you had two antennas only a few meters apart? Would the separation be better or worse?

@HamRadioDX 4 ай бұрын

You can calculate theoretical isolation using calculators. Here are a few that I use: calc.commscope.com/qhisolation.aspx calc.commscope.com/qvisolation.aspx

@praetoriantmotc 4 ай бұрын

Love these videos, always learning something new! I'm in the process of sourcing bits for my shacl and wondering whether you could then run a splitter or selector off one of the feeds into two radios? Ie I have a 70cm radio, a dual band 2m/70cm and a 6m. Could I run the one antenna into a diplexer, then the 2m/70m leg into the two radios? Thanks

@AubsUK 4 ай бұрын

You said you have two radios but then explained what sounded like 3 radios - (1) "a 70cm radio", (2) "a dual band 2m/70cm" and (3) "a 6m". Do you mean triband 6m/2m/70cm as the second radio? From what I've been reading, I think you could split 2/70 to one radio and 6 to the other radio. But I think you'll have issues if you want to split 70 to one radio and 2/70 to another radio, because they're both on 70.

@AubsUK 4 ай бұрын

Listen at 12:20, Hayden says he has a Diamond V2000 tri-band antenna, and can listen to 2 and 70 on one radio and operate on 6m on the other radio.

@kyhwana 4 ай бұрын

The dreaded OVF!

@JimmyCall 4 ай бұрын

@HamRadioDX what's the rule of thumb on spacing of antennas? Is there an inherent problem if an antenna is too close to another?

@forgetyourlife 4 ай бұрын

1/4 mile to be absolutely sure but most people can’t do that. Near field interference is a crap shoot. You just have to try it. Far as possible though.

@JimmyCall 4 ай бұрын

@@forgetyourlife This question is for your own base station various antennas. I guess you're answering that too.

@chrissewell1608 4 ай бұрын

Why is a diplexer (2M / 440) so small? Yet, a duplexer (2M / 2M) giant size, by comparrison?

@HamRadioDX 4 ай бұрын

A diplexer is a simple L/C HPF circuit, so can be built much smaller. Duplexers need high Q due to the small frequency spacings and to do that, you need 1/4 wave resonators (i.e. large)

@pauls8456 4 ай бұрын

Be a little bit careful of the two radios into the one antenna use of these as others have said. I wouldn’t trust some of the cheaper brands to have the advertised isolation…. Good video.