Видео

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

ruclips.net/video/cNyUxl0MXWQ/видео.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!

Wow!

Nashua Rd. Was closed from 2:15PM until 10:45PM. My power was restored at 7:50PM. Because of the truck pulled out the service connection at the house across the street (600ft or so away), their power was not restored until the next day.

yikes!

Fantastic presentation. I was there live and really learned a lot about ham satellites. The only problem is that now I need to buy another antenna and radio so that I can do some satellite coms. (KC1RVK)

From the presenter: Hi all, Skip is right (as usual). My comment about "space is big" related to the cross-section of intact objects vs the amount of volume contained by near-Earth space. However, the Kessler syndrome is real - as debris gets created over a range of sizes, one gets a gradual degradation in space objects in LEO and beyond due to things like surface abrasion, kinetic impact, etc. The emphasis is gradual though - the single catastrophic events as in the script of the movie "Gravity" are not the longer term problem. But there are single event problems that you also want to avoid: the January 2007 Chinese antisatellite weapon test against one of their nonfunctional weather birds (Fengyun 1C) caused 20% of all the space debris in orbit since 1957. For those who want to read about the emerging, rapidly accelerating, and very serious space debris and orbital occupancy problem, here are some more links to follow: celestrak.org/satcat/boxscore.php www.space.com/kessler-syndrome-space-debris www.nytimes.com/2023/03/02/science/hubble-spacex-starlink.html satellitemap.space

Apologies for the substandard quality of the video. For some unknown reason, the video camera had issues this day.

Very informative. Thank you for the presentation.

Very nice presentation Dom - thank you. 73 John WD1V

Smart idea!

Simple little print, but very useful! I will need to print some of these. Useful in multiple places.

Now that is neat and for guy who is starting to learn CW this might be a fun tool. Thanks for sharing that with us Bruce!

Very fascinating! The fact that vintage equipment like this can still be serviced and still work is amazing. Nice work Rod and thanks for sharing it with the club!

really excellent talk!