Відео

Very nice. One day, about 50 years ago, in high school physics class, the teacher brought out a microwave receiver and transmitter. Forget the specs on them, but we were supposed to play around with them and see how far away the receiver would pick up the transmitter, etc. I got the idea of placing both horns on a bar, facing the same direction, and feeding the output and received pulses into an oscilloscope. I could see the outgoing pulse and then a short time later the return pulse on the receiver. Made a very crude radar but it did work.

I picked up an ancient police X band radar head one time. 12 volts in, doppler audio out. 100+ mW. Gunn into a big horn about 25 dB gain? I hook it to a battery and an amplified speaker. I play around with it and can get doppler returns from aircraft. Birds flying over make a cool sound I guess because of flapping. I tuned it to a freq. that is legal for me below 10.5.

I own one of these and was wondering how difficult it would be to gut it and install new electronics for reenactments.

Very interesting history documentary. Thanks for the video.

Is this guy on Facebook or any other platforms?

Very cool project, thanks for sharing!

I was involved witht the early UAV systems, mainly the FTR, or Flight Termination Receiver, on 4 Ghz. Twin boom, push/pull engines using a pair of Moto Guzzi engines on the composite airframe. Fascinating time in the 90s. 40+ years in communications engineering. KA9UCE Good, but short presentation. I wosh you went into detail on the layout, of what appears to be amplifiers, couplers and possibly attenuators.

2.X - 2.6 Ghz...'S' band.

I am reasonably certain one can build a "CB" radio. I stopped watching after that claim as I am unable to find a supporting law in your country.

Thank you, I really enjoy your researches on old radio. I still build this sort of thing!

Love radio everything !! Good history.

quite the machine!

Greetings from Finland! UA-cam just recommended me this video at 5 views on a Saturday morning. What a world we live in!

Very nice. I have the BC-453 (Q5ER), BC-454, BC-455, and a separate power supply that a friend of mine restored and built from scratch. He had to move to a smaller place, so I bought them. See you at the new NEAR-Fest, hopefully. 73 Paul AA1SU

nice setup!

Eliot did a nice job of explaining things as he went and it made for a nice video experience.

Looking good, Bruce!

# PEPPERELL 4th of July Parade

Wow, 14 towers! I would love to have one 30ft tower. Thanks DX Engineering for Fast shipping my 203ba got here yesterday. de W2CSI

A few comments on your video; you can listen in to VLF transmitters with simple equipment, even a coil of wire can be plugged directly into the mic input of a computer with spectrum software to see the carrier frequency peaks of the transmitters in Europe and the USA. NAA has a service area of about 5000 km but most of the transmitters have lower power, from 50 to 500 KW ERP. Geophysicists use VLF for mineral and groundwater exploration, the horizontally polarised field generates local secondary induction in steep-dipping mineralised and water-bearing geological structures which can be located by the tilt angle of the resultant elliptically-polarised secondary field. The phase angle between primary and secondary fields also provides some information on the conductivity of the bedrock and soil cover. There are also pipe locator instruments which can use the VLF signals and sometimes these work better than the usual inductive Tx-Rx systems or the 50/60 Hz mains hum detectors.

I have worked this station ( K3LR ) many times.

This was an excellent presentation. I purchased a TinySA Ultra because of it. -KC1RVK

Terrific overview, Les. Some other things I’ve found in a similar assembly of test equipment: 1) The tinySA Ultra is a great device but its minimum resolution bandwidth is 200 Hz. This is just about enough to see AM modulation side bands on a carrier - so a real spectrum analyzer ($$) would have down to 10 Hz RBW and would allow a fine grain view. But consider the price differential. For anything a ham needs to do, it’s great. 2) The nanoVNA does need some understanding of its limitations - it is going to struggle with impedances >= 500 ohms or <= 5 ohms. This means that you have to be careful when measuring filter responses to not perturb the filter response when the design is aiming for a 500 ohm match and you’ve just terminated it in 50 ohms with the VNA. You may have to use input and output transformers in that case to match the ins and outs of the filters to the expected 500 ohms or so for a typical filter (the response really does radically change in that case). 3) Port #2 on the nanoVNA has some problems with reflected power for non-50 ohm situations, and I’ve seen that a good idea in some cases can be to use a 10-20 dB attenuator on port #2 to help the problem with matching (at the expense of poorer amplitude fidelity; you can’t have everything). Great tools for today’s amateur, far beyond what was available even a decade ago!

Thanks for sharing this! I sent your webmaster an email to connect about getting our local Girl Scout troop involved.

Thanks for sharing this. I am exploring doing an event with my girls troop this February. This gave me some good ideas. 73

Thanks for sharing this. I am exploring doing an event with my girls troop this February. This gave me some good ideas. 73

Thanks for sharing this. I am exploring doing an event with my girls troop this February. This gave me some good ideas. 73

There is one question many want to have an answer to. How much do U estimate has been spent on the whole station inc maintainance over the yrs? Thanks Andy RD3PO

👇 'promo sm'

I like it very much. best 73. de 4L5P

Very informative and enjoyable, thank you from Copenhagen

Super!

what are your thoughts on electron precipitation by ULF/VLF

Some of the signs say "Small town, big bang!" Looks to be absolutely correct!

Looks like a very well done celebration for a small town!

Fun clip of Sandor playing radio. KC1RVK

Uncle Günter waving a Hand into Nashoba Valley 💯👌🙋‍♂

Seems like a reliable piece of machinery.

Such a beautiful setting. Thank goodness it was last weekend. This weekend is a soaker.

Fun to watch and for a non-CW operator it is all magic to me! KC1RVK

Sky really cleared up for you guys!!

Now that is very cool! KC1RVK

Good job Matt!

Nice to see a new ham get on the air!

nice job

Looks like it was a fun day! I’ll plan my vacation getaway better next time so that I can participate. KC1RVK

ua-cam.com/video/cNyUxl0MXWQ/v-deo.html ,, D-DAY war reenactment on Santander beach, parachute jump and landing on the beach other videos of the day

Small town; big heart.

Wonderful and educational presentation! This was my first New England QSO Party and it was a lot of fun. -KC1RVK

Fantastic!