Military HF Radio - Episode 1 - RF Theory
ฝัง
- เผยแพร่เมื่อ 16 ก.ค. 2024
- A brief overview of RF Theory as it pertains to HF radio communications.
Agenda:
FCC Amateur Radio Licensure
Army Doctrine and Training Overview
Radio Communications
Wave Propagation
Propagation Paths
Solar Activity Effects on Communications
Hosted by: Matthew Sherburne, KF4WZB
Assistance by: David Fiedler, WB2CDG
Everything will be all right, you will shine like a rising star, a huge success and wealth
I just love you!! Classic music is life!I can work better, think better, to appreciate life
The little piece of paper got me out of the meet grinder in Vietnam. Spent 8 months in the MARS system.
Back in the day, when G1/S1 types actually READ your 201file (personel records), they could find people with special talents & fill needed jobs. My novice license & Mcode quali pulled me from the grinder.
A great series and a must for any military rad op to brush up on their skills after years of using only VHF and Satcom. Thanks!
I very much look forward to the remaining episodes of your lectures on military radio. Excellent lectures and very informative. Thanks for your good work!
This was well made and I'm a new subscriber due to the quality of this video .
Pro job! Thanks so much for your creativity, hard work and perseverance. You are a great professor indeed. 73 from KC1ANR
Really good revision, thank you 🙏🏻
Excellent theory presentation and kudos for nailing down what the 300 is in the wavelength / frequency math. I never realized it was the speed of light represented.
2023 Fantastic Series. Huge thanx 73
Bro, I’m gonna teach this course to my 25Us. Thank you brotha
There was a TTP from ALSA that started in 2002 called HF-ALE. I think the material they produced got integrated into the tactical radios. Anyways I wrote to ALSA in 2001 when the main radio of the last 20 plus years was debuting. They took up the idea and invited me to their working group and then the corporation would not let me attend the working group. I was a newbee at work but I had 23 years HF experience in HF to include guarding the Fort Jackson MARS station in 1976 and included finding my first HF-ALE radios in 1994 as immediately knowing this was the holy grail. This series is the best I've seen.
Nice series of videos. Thanks
Matt, I am so excited for this series. I have watched another video with one of your mil/ham radio presentations many times. Also, it is great to see Dr. Fiedler named as well. He is the king of the resurgence of .mil HF (including tons of NVIS data). Have you worked any of the ham digital voice modes (like Codec2) or weak signal data modes (like JS8CALL)? Keep up the great work!
I posted another video of me using JS8 (former FT8Call) a couple of weeks ago. I also have been working FT8 and JS8 from a uBITX I built.
Just saw the JS8CALL video. It looks good. What was your time source? Also, I was looking at the ubitx transceiver as well. It is an interesting unit. There are reports of the tx filtering being poor though. I was also trying to decide if it made sense to run a T2FD vs. Tuner for higher powered stations. Any thoughts?
@@tyroncalta just synced off my phone since the setup was beyond my home's wifi to nab NTP. As for T2FD for high powered stations, we found at the West Point station that there were some parts of the spectrum giving us 3:1 with 2:1 or better on about 90% of the range operating 600W. So they ended up getting a tuner to protect radio. They use a TD-90HP800 antenna. Still T2FDs are great antennas.
Good video I was wondering how the weather would affect radio waves in the artic circle
In my experience wavelength formula is 𝛌 = 285 : FQ
-Don’t ask why, it just works- It counts in Cu wire velocity factor of 0.95.
Also have a 1950s weather balloon high frequency radiosonde Radio
Have a military Crystal calibrator I'm assuming tube hybrid, coming that goes from 26 megahertz almost to 28 megahertz it looks like it's a little bit of shortwave and medium band that's HF trying to figure out how to use this thing
Typo, VG 38. "1 Year" should be "11"
I was depressed for a long time, and I looked so useless and bad.
Can i get the slides for this?
Not sure if you will respond to this. but I am slightly confused by one of your statements. When you talk about absporption fadiing.. you mention that during the morning, the D layer has increased absoprtion as it builds up it's ionization. Then you say solar flares can cause excess ionization in the D layer causing more absorption... But wouldn't this cause refraction and not absorption? I thought the greater the ionization, the greater it would be charged, and so would cause refraction? I am confused, and can't find anything online that helps me out
The D Layer is different from other layers. You can not apply same increased ionization understanding to it as some of the other layers as it is composed of differently. Read about the different layers here en.m.wikipedia.org/wiki/Ionosphere and then also type solar flare absorption d layer to see many resources and papers on the topic.
@@militaryhfradio244 Okay will do thanks for the response! I guess I was also finding contradictory things online too when i tried to look more into it. Like here is a quote I found " When a solar flare occurs, even the D layer becomes ionized, hence allowing signals to bounce off it". This was talking about the daytime specifically. I feel like this contradicts other things I find, and like you said, solar flares causing more absorption and causing issues with communications
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