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Hey im Australian, what was yhe first season? Skeeter season? Is that a mosquito season. Or a "shooting" thing ? (Bad dark humour incoming) Do you have marshmallow roasting season? That's when everything is on fire and all you can do is make smalls? With hope the house will still be there

Your definition is correct on terminology Jim, the idiots saying you're wrong, are, idiots. They've learned from Chinese whispers, or donald trump, both comical anyway, comet should know better, but there is a reason comet does home user stuff, and doesnt do any good in the big boys league like TXRX/Bird or Telewave, (ie: commercial and government world who do know their stuff) and this is one classic example why when they cant get something as simple as a diplexer named correctly, its also why I dont buy comet.

Make sure you are 2-3 wavelengths away

A wideband, frequency insensitive, amplified rf level measuring device at a ham convention. Results will be interesting.

YES!! 100%! Plus no matter how long you take to make cables nice and neat, within a week you have a matted mess under your desk! EVERY. SINGLE. TIME!

What I have not found is what is the current draw on this, on high power?

Hopefully this test puts the matter to rest.

I'm positively THRILLED to see that you have a good FS meter now Jim! I personally believe that they are an indispensable item and just as vital as a dummy load for proper operation of ones station. A FS meter was generally one of the very first projects a ham would build as a technician. Use it to measure the antenna patterns, and also the coupling between adjacent conductors. Looking forward to more videos using this tool. 73 OM 👍

Which antenna? Poseidon?

Looking forward to the results. i have worked with similar studies on smaller antennas where we had an anechoic chamber that let you have a lot more control of the variables in the environment the antenna is in. You don't have a lot of control over reflections and outside signal interference in the environment I would imagine you will have in the park in Florida. good Luck! 73

Are you going to put one of those on a painters pole for z axis measurements?

Looking forward to Data

A theory every bit as provable as String Theory itself.

It is -6F in Boston NY with 1 FT snow and wind chill -15F . still snowing and forecast 1 to 3 FT snow toll with low of -10and wind chill of -40 . never got over 5F today ! Where did global warming go ?

This is what it takes to get you outside shooting a video! Nice Jeem!

I thought there was promises of a snow angel?

Heat Miser must have taken the day off.

I think you should have used your Ape Approve micrometer!

Wow I didn't know they get snow in Alabama

Enjoy it cold, but no snow in Huntsville, AL

We got over 5” over here in Southeast Louisiana. Crazy

Bout the same in Beaumont Tx

That Jacket must be keeping you warm

Gonna need to take measurements in 6 different locations of your property and average them out..ya know for accuracy

You have about as much snow as I do here in Wisconsin

It's a level 2, French toast emergency. Bread, eggs, milk and go.

For all that are watching this is just LA (Lower Alabama) They got blasted with snow. Us in the norther part of Alabama got nothing but dry chapped lips and cold as a witches breast in a brass bra weather….I smell a government conspiracy!!! Just joking hope your are enjoying the snow and be careful with your hip.

Holy cow Jim.. hope ya stocked up on bread and milk

Im from neshoba county which is 2-4 hours from Alabama and hes so right on the seasons😂😂

Son, it's so cold up here it could freeze the balls off a brass monkey.

This software is implicitly good, but it interferes too much with the basic system, e.g. bluez, if you install it, it will automatically be uninstalled. This means that other services such as svx are not possible because the required components disappear again. Better keep your hands off it.

What you call "duplexer" is not a one-way device: generally speaking on a repeater are used a band-pass filter + a band-stop filter. ... And what you have in your hand is not a "band-pass" filter as you say: it is a low-pass + a high-pass filter.

NOOO! DON'T USE THAT DEVICE TO CONNECT MULTIPLE RADIO ON THE SAME ANTENNA !!! Generally speaking separation among the bands is not enough (it needs at least about 60 dB) to avoid the risk of damage by RF power into the rx of the other radio. Don't do it at home !!!

The industries are rife with mixups. Doesn't help the I/U keys are right next to each other on a QWERTY keyboard.

At HF it looks like you have 60db of isolation, given 100W you'd have 0.1mW of HF power on the VHF radio. On VHF you have 45db, given 100W on VHF you'd have 35mW of power on the HF radio. The answer might be as simple as an extra lowpass filter on the HF port to get more VHF rejection. Thanks for the follow up

Thumbs up, not sure if you terminated the antenna port of the duplexer during your testing, but the isolation may improve a little when antenna port is terminated verse left open circuit.

I have a Comet triplexer. It is connected to a 2m-only radio, 70cm hotspot, and SDR to pick up my county 857MHz P25. The 2m port also passes HF. I am not sure I would want 100W out of the 2m radio. It goes to 65W, but I run it at 25. The hotspot still works!

Can you use two diplexers, one on either end of a coax, to put two antennas on a single run of coax?

"ya'lls comments" He has been assimilated by the bama bug! Thanks for the video Jeem! 73

Oh god! He reads these? What have we done?!?! 😂

At around 10:00 it looks fine. They are not "band pass" filters. It's a combo "low pass" / "high pass" filter. That's why your not seeing it drop off at the top end. In the case of a diplexer they usually specify a upper frequency limit for the high pass side because above that it will start to attenuate the signal more and more the higher you go. A triplexer on the other hand has 3 types of filters. A low pass, band pass and high pass filter.

It's a duplidiplexicator.

Thanks for the explanation Jim. Learned something new today!

The definition I've come to know is that a duplexer allows two signals on the same band. A diplexer separates signals across two bands. Don't know that this is the definition established by God, but it's what I understand. And if you really want to cause a stir, try defining what signal is full duty cycle versus partial duty cycle. You'll get people resorting to fisticuffs over that one!

I have an ICOM 705 (HF & VHF/UHF). What can I use to connect an HF antenna and a VHF/UHF antenna to the 705’s one antenna connector?

This was very educational. Thank you!

While I applaud your desire to teach, I must inform you that you are wrong in your assessment of how each “device” works. Duplexers and Diplexers are the same thing! Both work on the separation of “frequencies” not “direction” of the signal. You are confusing a duplexer/diplexer with something that does move radio wave based of “direction” and that device is called a “circulator”. The duplexer/diplexers signals based on frequency, hence the fact that true repeaters separate the transmit and receiver frequency’s. There are many publications that describe these facts are far more detail should you choose to learn the “facts” about said devices! 73’s!

I wish they were all called (de)multiplexers with qualifiers, as seen in other domains with similar issues. For example, signals can be time-division (de)multiplexed or freq-division (de)multiplexed.

I think you have it bass ackwards... Diplex is directional and duplex is 2 Plex, tri is 3 Plex and quad is 4 Plex. All the duplexer cavites I've tuned has been for frequency. The diplexers have had 3 ports one for the radio, one for the antenna and one for a dummy load to dump the reverse RF.

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