I documented in an earlier blog post that I recently switched my daily driver computer from a 12 Gen i7 Windows PC to a new Mac Mini M4 Pro. It’s been a week and all is working as well as I expected. I can attend conference calls using my ATEM Mini and my Scarlet 2i2 audio as source devices. I’m working with Google Docs and Photos and Videos on the web with no issues at all. I’ve even got the slicing software running for the 3D Printer to churn out some stuff.
All that is good, but there was one thing I couldn’t figure out. I have an extensive group of websites I need to access on my LAN. These include the web control pages for my NAS, Flight Aware, even a small switch I use for studio lights. Here was the issue. I couldn’t access any of them via the Google Chrome browser. I could ping the devices. I could access them via Safari. So, why can’t I see my LAN websites via Google Chrome?
I was poking around and poking around, until I finally found the answer on Reddit. It seems that security permissions were keeping Chrome from accessing items on my “local network.” Once I found that, I’m rocking along.
I thought it would be helpful to show others where to find this if they need it. This is a change in “System Settings” in MacOS. It’s not a Chrome specific setting. Here are the screens to follow in MacOS Sequoia 15.1:
In System Settings, select “Privacy & Security”
2. In Privacy & Security select “Local Network”
3. In Local Network, flip the switch to on. Not sure why I have two Google Chrome’s listed, but so it goes.
I am really thankful for the folks on Reddit to have shared this answer. I hope this post will pay-it-forward a bit. You can find me on social media if you have any comments. Just search my callsign – N4BFR – and you’ll find me!
In previous blog installments, I’ve tracked how long it takes for my computer to calculate an extended number of digits of Pi as a performance metric. I called it How Long for Long Pi. There is a new computer to rule the ham shack today. It’s a Mac Mini M4 Pro with 48 GB of RAM. I decided to compare it to my most recent machine tests and see how it does.
I broke out my Python script from last time and started doing test runs. Let’s do a basic comparison to my I7 12th Gen PC with 32 GB of RAM. Those were the top performers in my previous experiment.
Machine (Times are 3 run avg)
Pi to 100K
Pi to 1M
Notes
i7 Desktop with Win 11 12700A CPU
6.2 Sec
12 Min 35.0 Sec
i7 Desktop with Ubuntu 12700A CPU
5.4 Sec
08 Min 57.2 Sec
Mac Mini M4 Pro
4.47 Sec
07 Min 27.0 Sec
Executed with Py Editor from Apple App Store
By this benchmark alone, the new Mac Mini M4 Pro is processing at 16.7% faster than a 2022 generation Intel desktop running Linux. How about 40.8% better than Win 11?
I’ll add some general observations. The Mini doesn’t seem like it’s breaking a sweat. It’s warm to the touch but not overly so. The fan has not come on. I’m typing this blog post while the calculations are happening, so it’s even got a little bit of a handicap.
I did have to make one change to the code, adding a line to allow for a larger string. The version I used is below. Let me know on my socials if you try this.
#-*- coding: utf-8 -*-
# Author: Fatih Mert Doğancan
# Date: 02.12.2014
# Timer Integration and string modification 0-Nov-2024 by Jim Reed
# Timer function Start
import time
start = time.time()
print("Dogancan - Machin 1,000,000 Digits Pi Calculation Start")
#Original Calculation Code goes here
sys.set_int_max_str_digits(1100000)
def arccot(x, u):
sum = ussu = u // x
n = 3
sign = -1
while 1:
ussu = ussu // (x*x)
term = ussu // n
if not term:
break
sum += sign * term
sign = -sign
n += 2
return sum
def pi(basamak):
u = 10**(basamak+10)
pi = 4 * (4*arccot(5,u) - arccot(239,u))
return pi // 10**10
if __name__ == "__main__":
print (pi(1000000)) # 10000
# calculation code code ends
# timer reports
end = time.time()
print("Dogancan - Machin 1,000,000 digits elapsed calculation time")
print(end-start)
I recently went to Dayton Ohio for the annual Hamvention. While there I always try and get in a visit to the USAF Museum at Wright Patterson AFB. I love seeing the planes and missiles, and it’s a great place to get my steps in.
This museum is home to the Apollo 15 command module capsule. That made me think, what capsules have I seen? Our friends at NASA conveniently have a list, so let’s do a check in:
Apollo 6 – Fernbank Science Center, Atlanta GA Need it
Apollo 7 – Frontiers of Flight Museum, Dallas, Texas Need it
Apollo 8 – Chicago Museum of Science and Industry, Chicago, Illinois Need It
Apollo 9 – “Gumdrop” – San Diego Air and Space Museum, San Diego, California Need it
Apollo 10 – “Charlie Brown” – Science Museum, London, England Visited 19-October-2022
Apollo 11 – “Columbia” – The National Air and Space Museum, Washington, D.C. Visited 11-May-2021
Apollo 12 – “Yankee Clipper” – Virginia Air and Space Center, Hampton, Virginia Need it
Apollo 13 – “Odyssey” – Kansas Cosmosphere and Space Center, Hutchinson, Kansas Need it
Apollo 14 – “Kitty Hawk” – Visitor’s Center, Kennedy Space Center, Florida Visited 23-February-2024 – Photo Needed
Apollo 15 – “Endeavor” – USAF Museum, Wright-Patterson Air Force Base, Dayton, Ohio Visited 16-May-2024
Apollo 16 – “Casper” – U.S. Space and Rocket Center, Huntsville, Alabama Visited 09-July-2020
Apollo 17 – “America” – NASA Johnson Space Center, Houston, Texas Visited 21-October-2021
Apollo-Soyuz – California Science Center, Los Angeles, California Visited Center 07-Oct-2021 but not photographed.
I’m a walker. I picked up the habit not long after I left corporate life and I walk about 330 days a year, give or take some rain or a cold. So I heard that there was a new rail trail in my neighborhood, just opened before Christmas. I went to check it out.
Assembly Atlanta is a new TV/film studio that is on the spot of the old GM plant in Doraville, GA. While I could find that there IS a trail with a nice bridge to cross, I had a hard time finding out how to access the trail. I checked their posts on social, and even put out my own questions, and didn’t get answers. So I went exploring.
I found one of a very few public parking spots in the area behind the “Blue Lot” of Third Rail Studios. It’s at the corner of Assembly Line Drive and South Rail Way next to a corporate office for a bedding company. This would be at the south end of the trail.
I started my walk by going down South Rail Way, taking a sidewalk painted blue with some bike path insignia that parallels the fence of the Norfolk Southern rail yard. That dead ends so I made a left onto Ruins Way west then on Industry Ave. Finally onto the actual rail trail. It starts off as concrete paved sections with the rail still embedded, and I liked the look.
I walked North toward the corner of Makers Way, paralleling the back of Third Rail Studios, where you pass under a big “Assembly” sign made from some old rail loading equipment. At this spot in the trail it is unfinished. You’re crossing over mud, dirt, rocks, etc. (Note: Photo is looking north).
Once pas under the sign and cross the dirt area, you continue northward with the Assembly Atlanta studios on your right. On your left are some industrial facilities, like the collision center on Peachtree Rd. From a walking perspective it’s an easy, flat, concrete surface that takes you across the covered walking bridge and out Gate 3 of Assembly Atlanta. The path / sidewalk dead-ends at Peachtree Rd. There is no parking at the northern terminus of the path, unless you use the lots for one of the supply shops or the music school. It’s not 100% “public” parking so I don’t recommend it unless you have explicit permission.
I turned around at the gate and made my way back, roughly along the same path. Round trip was 1.57 miles and 32 minutes according to my fitness tracker, which generated this map.
Plusses and Minuses
From a plus perspective it’s a nice, flat, well cared for walk. Excluding the spot still under construction. It has some urban feels to it while walking near the active tracks and office building, but you get a more rural feel near the bridge. As a plus, you could take a shorter route by avoiding the walk near the active tracks. You can also make it longer by going down the rail trail and coming back on Peachtree Road. That part of Peachtree Road is narrow and without sidewalks. I don’t think I would personally take that option.
In addition to that minus, I felt eyes on me the whole time. There are cameras peeking over the fences at Assembly Atlanta and I never felt I was in a private area. Obviously the fact that it’s unfinished is a minus if you have trouble traveling over loose ground. I also am concerned that parking is very limited. There are maybe 10-15 public spots near the office, but everything else is private parking so it didn’t feel it’s a super accessible trail. Another minus for me is that the whole time you’re walking by the studios you’re up against a high cement fence. I was hoping for a more, “go take a walk and see what’s happening at the studio” kind of attraction.
Last minus, it’s a noisy walk. You’ve got trains moving cars in the rail yard. It’s right in the landing path of PDK. Plus, the backside of the Peachtree Road buildings are running generators and air compressors.
My Takeaway
Good for PR to say you built a trail with your new construction. So some kudos to Universal and Gray. Maybe when things are busy at the studio it will be good for the people who work there. I’m sure we’ll see it used in productions. For me, it feels tough to just use if you want to walk in the neighborhood. Maybe if it eventually connects up to the Chamblee Rail Trail and you could park at City Hall it would seem more accessible. I didn’t see any signs of something like that happening.
If you have a different opinion or think I missed something, reach out to me on social media. I’m @N4BFR on X.
Took my Tesla Model S and a friend up to Western NC / Eastern TN for some leaf peeking at the Tail of the Dragon this weekend. Was able to bring the DSLR along for some pics.
The Tail is a really nice mountain ride around the Great Smoky Mountains NP. I think it has better PR than some roads, but it was a fun trip. I thought the Tesla handled very well on the mountain roads.
I’ll also say the ride to and from the Tail is as good as winding through the mountain. The Foothills Parkway in the Great Smokey Mountains National Park leads to a beautiful lakeside drive before you meet the Dragon on the North side. To the south, once you wind down past the tail of the tail in NC you get a lovely riverside cruise on US-129.
What’s a better receiver for an APRS receiver for packets from the ISS? Let’s do a side by side test.
Left is the challenger Baofeng, Right is the RTL-SDR Champion
For several months now, I have been running signals from a discone antenna on my roof into a RTL/SDR receiver connected to a Raspberry Pi. On a good day, I pick up a few packets from the ARISS digipeater running on the ISS at 145.825 MHz.
I was wondering if I could hear more packets with a different receiver so I decided to create a side/-by-side A/B test. Here’s the configuration:
Discone Antenna fed into my “Tech Center” / Ham Shack Split antenna with a coax “T” – one goes to champion setup, one to challenger. Using equal length coax with SMA connectors.
Both are tuned as best I can for audio quality using data on 144.390, and then switched to the ISS frequency.
The experiment was configured on Wednesday, December 21 in anticipation of a predicted 83 Degree Elevation pass on 22-Dec-22 at 17:26 UTC. I’ll update this blog as I get pass data in.
Update: 23-Dec-22 at 0955 UTC – A moderate height ISS pass (32 deg El) coming through this morning at 1007 UTC. Couldn’t gather data Wednesday because the ISS radios were off for the space walk.
Update: 23-Dec-22 at 1023 UTC – ISS radios were still off during the pass. Trying again later today (Friday).
Challenger radio on left, champion SDR on the right.
Update: 23-Dec-22 at 17:00 UTC – Good pass with many packets caught. There was an obvious winner in the SDR. You can see on the screen show it captured many packets while the Baofeng only reported 1 for the entire pass. Going to change HT’s and try again on a later pass.
(10-October-22) Let’s start off with a true confession. I have GAS. Gear Acquisition Syndrome. I like to get new stuff and try it out. However, neither of these items are particularly new. So, why get the iPhone 14 Pro and the Apple Watch 8 now? Let’s take them in parts.
Back when the pandemic first started, I had an iPhone 10 (or is it X, I’m still not sure what I am supposed to say). Unfortunately something happened with it’s near field communications and I needed that. Not “I really want to have it” but “I have health related devices that use it, so I need it fixed.” Because COVID, I couldn’t get good help from Apple, the phone support sent me to the store, and the store sent me to phone support. You know the basic support circle-j***. I threw up my hands and got a Google Pixel 5 as a replacement.
Now, I like the Pixel 5. Fine phone with a really good camera. I think the Android platform lacks some of the fit and finish of Apple’s IOS, but nothing that was a real deal breaker for me. If it wasn’t for a couple of things I would have been content staying with Android. In fact, the transition from Apple to Android was much easier than the transition back. More on that in a moment.
What sold me on going back to Apple in general and the iPhone 14 Pro in particular were the emergency communications tools and the camera. As a ham radio operator I probably understand the limitations of wireless better than most people, but even then I have been let down by all the carriers while road tripping in places like South Georgia or the Blue Ridge Mountains. While I always seem to find a way in an emergency, I don’t like knowing I might go hours without coverage. The emergency messaging via satellite will help me fill in the gaps and give me peace of mind when I am on the road or in the mountains and that’s a huge value to me.
The other item I mentioned is photography, and I like to take pictures and videos so all types of changes in those areas get my attention. As I mentioned I am big on travel and one of the things I have been trying to do is reduce my load. When I go to the mountains for pictures I typically take a DSLR with tripods and computers to back up SD cards and it’s a lot of stuff. I felt that with the new camera – 48 Megapixels, lots of shooting modes and options, plus a much smaller footprint – I could break free of my DSLR. With a trip to England coming up, hitting 8 areas in 10 days, I wanted to keep my load low and this will help. The picture quality is very good versus the Pixel 5, not that the P5 is bad at all. See my first impressions blog post for a bakeoff. This article on PetaPixel gets into the upgrade benefits.
So, now you know why I made the switch. The how was painful, but it’s one time pain. Some brief takeaways:
– With the switch TO Android there was a nice tool to make the migration with a custom cable that connected the 2 devices. No cable here and I couldn’t even get the phones to talk to each other despite an app to promised to do that very thing.
– My wireless provider is AT&T Prepaid and they were not prepared to handle this type of conversion. The iPhone 14 Pro only uses and eSim while the Pixel 5 uses a physical one. I was without service for about 6 hours while I was sent from store to phone and almost back to store before a manager in Chat support saved me. I hope my experience became a support article so others don’t go through that pain.
Let’s talk a little about the watch. I had an Apple Watch 3 and it was fine. I didn’t feel like it was a critical device for me, and actually handed it down to a family member because I am more of a fan of mechanical watches. I did try a couple of Android watches, one from Samsung and one inexpensive knockoff. I wasn’t impressed and didn’t really integrate them into my lifestyle.
In the gap of 5 versions however, Apple has focused more on health apps and I have become more focused on my health. It was time to give the watch another try. A few week after getting the phone I went to West Farms Mall outside of Hartford and shopped the Apple store. My biggest question was, did I want to go with the Apple Watch Ultra or the Series 8. As much as I have that GAS I admitted earlier, I couldn’t bring myself to spend the extra $300 on the Ultra watch. First, I didn’t like the size. While I am OK with a big watch, that particular one just seemed very thick. Second, I didn’t need cellular connectivity on my watch. I don’t get separated from my phone that often that I need additional access, and I don’t want to pay the monthly vig for the privilege. Now in fairness, I don’t know if cellular activation is required, but it’s on more thing to break. So, I went with the base Series 8.
So far I am really pleased with all the integrations on the Series 8. Sleep tracking, exercise apps, health apps, controlling podcasts from the phone in my pocket, all good things so far. I also like the batter life. I charge it while in the shower and it runs most of the day without issues. Some nice watch faces too with different complications. That’s an area I want to explore more as I go.
So, outside of the computer (a custom built Windows PC with a bug that is fading) I am all in on Apple again. I’m not feeling like an Apple fanboy, just a user. One of the biggest lessons for me over the last year or so is that you may as well shop for the features you want and just be prepared to put in the time to fight with support, because no company these days is looking to have world class support.
The iPhone and watch are headed out on their first long road trip. I’ll update on performance if there is something significant to share. Thanks for reading and if you have any thoughts on this, please send me a tweet to @N4BFR on Twitter and help with the conversation.
While I haven’t played with these long wave bands yet, it would be nice to understand if I have any restrictions to that operation. Since the FCC requires me to notify the Utilities Technology Council 30 days before I start operation, I decided to do that.
The link wasn’t jumping out at me from the main utc.org page, but some Google-fu lead me here: https://utc.org/plc-database-amateur-notification-process/
Of course they want lat/long in Minutes and Seconds and all my GPS Pi’s deal in decimal coordinates, so I found this handy conversion tool on the FCC web site: https://www.fcc.gov/media/radio/dms-decimal. It was only AFTER I found the FCC link that I noticed they linked to the same page. Usability opportunity to move that above the entry window or, heaven forbid, convert it themselves!
So, I dutifully entered the data right down to the 100th of a second because I am that kind of nerd and was informed I needed to round that to whole numbers. If they don’t mind a margin of error of 100 feet +/- in latitude, why not.
So my “notification” has been successfully submitted. Stay tuned for what happens next.
As always, provide feedback via my twitter @N4BFR.
For quite a while now I have been putting up with heavy RFI on 20 Meters in my shack and I have been really thinking it’s a neighborhood problem more than an in-home one. It looked like this on my waterfall:
Flex Smart SDR 20 Meter Band View
I was getting ready to call the power company and ask them to come fix the transformer outside my house. I based this on the fact that as I turned the antenna in a different direction, the closer I got to pointing at the transformer, the stronger the RFI became. Here is my chart.
Home made polar coordinate chart showing peak signal strength, along with a second measurement
So, step 1 was to identify the problem and a likely suspect. After reading a bunch of articles on RFI chasing, I wanted to 100% eliminate the chance that it could be something in the house, because if you look at the path between the Antenna and the Transformer, it goes over the house.
Antenna to Transformer
On to step 2 then, eliminate the house. So on Friday I set up one of my radios on battery, tuned to the peak of the signal and one by one turned off every breaker in the house and wouldn’t you know it went away!
So, one by one, I powered the breakers back up, starting with areas where I have a lot of electronics, including my shack, which is in that line. I needed to leave 30 seconds between each power up so all the devices would get to normal “radiating” state. The shack was clear, but when I got to the Living Room – there it was.
Step 3 was figure out what the offending device was. I had experience in the past with an ethernet switch causing interference. So I disconnected that and powered up the rest of the media center. All quiet. Here’s what happened to the waterfall when the switch was plugged in.
Waterfall showing RFI appearance when ethernet switch was powered on.
Gotcha! Because that switch was in heavy use, I wasn’t able to replace it immediately, but today was the day. I bought a smaller switch that was powered over POE instead of a brick and here’s what the waterfall looked like when that old switch was disconnected for the last time.
Waterfall of 20 Meters (top) when ethernet switch was disconnected for the final time.
So, a couple of lessons for me: 1) Troubleshooting using the directional antenna was a time saver because I knew where to focus my energy. 2) Don’t assume it’s outside the house when there are other potential issues in the path. 3) The scientific method of change one thing only and then go on REALLY shined in this test.
This didn’t solve it all. There is more noise to be chased, but the largest offender is no more, and that opens up a great deal more of 20 meters for me, which makes me happy.
Comments about this post? Leave them for me on Twitter @N4BFR.
17-Sep-22 I shot some pictures this morning on my daily walk but this time I was carrying two phones. One was my 2 year old Google Pixel 5, which I have always viewed as a fine camera and I’m able to take lovely pictures with it. The other is the brand new iPhone 14 Pro. While I didn’t need a phone upgrade, I did feel the need for a camera upgrade before I left on a couple of trips. I wanted something that shot better 4K video and my DSLR does not. Plus, weight is an issue.
So on to the photos. You can find lower res below, however you can find full res versions on Flickr at https://flic.kr/s/aHBqjA7vFs. I selected these 5 because they had the most variety of the dozen different shots I took, not particularly because they were the best or the worse. I put them side by side using GIMP with no additional photo processing, so they should be as oranges to oranges as I could make them. (I was going to say “apples to apples” but…
The Trains: I find the iPhone photo a little over processed, for instance there was quite a bit of dew on the grass and since the processing seemed to focus more on the wood of the train, that element was lost. The Pixel photo picked up the dew, but overall the photos didn’t pop. I think my best picture would have processed it somewhere in the middle.
Garden Bunny: I really prefer the Pixel photo here. I feel like it did a better job of capturing the actual light. The iPhone photo makes the bunny feel a little over-bright and same with the flower above the bunny. A little better depth of field on the Pixel photo as well, look at the logo on the barrel.
Sidewalk: I’m mixed on this one. I feel like the Google Pixel 5 photo once again captured the breadth of the changes of the exposure better. It better conveys the mood of the actual time of the image. The brighter iPhone photo compromises the breadth of exposure for a photo that has richer tones and a sharper image to my eye. Again, like the Train, the truth would be somewhere between the two.
Stop Ahead: The size of the picture that the two cameras shoot was one of the things that jumped out at me. The 4×3 picture is a different aspect than I am used to taking, with the Pixel set for taking 16×9 photos, so I will be interested to see if the iPhone will allow me to adjust that. Nice vibrant colors in the iPhone photo and that feels like the image that was closest to reality.
Tennis Court: The iPhone wins this one with a sharper image and better processing of the colors and even the highlights in the trees. I feel like the aspect ration difference pays off here too.
I’d like to hear your comments. Message me on Twitter @N4BFR with your thoughts.
