A quick answer is yes it’s the same.?

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Hello all. Not sure if this is common knowledge or not. I did some searching before I began to mess with this and did not find a fix.

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Last weekend I camped at VE-0367 Rock Point Provincial Park (Pi 4 8gb/IC-7100/VK-162 GPS/no RTC) and activated VE-0058 Mohawk Island National Wildlife Area (Pi 0 2w/FT-817nd/VK-172 GPS/RTC). I noticed high DT in WSJT-X in both setups. It was a more evident running FT4 on the Pi 0 2w on the island. Decode performance was still very good, especially considering I was using a Pi 0 2w, but if your QSO partner has clock drift, things become more sketchy.

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I suspect the normal "refclock SHM 0 offset 0.5 delay 0.2 refid NMEA" line we add to /etc/chrony/chrony.conf is not correct. I suspect this is a remnant of original copy/pasted code, and it's good enough, so nobody has ever changed it. It's the same line everywhere on the internet that I could find.

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Here's how I tested with the Pi 4 8gb setup at home: force hotspot (so no internet connection on the pi), reboot, let the GPS sync, and open WSJT-X (then edit the file, reboot, etc.). I observed the most common DT to be 0.6 with the stock line. Very few were close to 0.0.

I did the same with "offset 0.1" and the most common DT moved to 0.2.

I repeated with "offset -0.1" and now there are a ton of -0.1, -0.0, 0.0, 0.1 decodes.

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I happen to be monitoring 21.074 FT8 which happens to be quite busy here and now, but take your pick. Please see my attached screenshots showing the DTs in WSJT-X in different configurations. I suspect that no offset is needed in most cases, but nothing to back that up. offset -0.1 is working very well here right now, with my combination. I will leave that for now. I am very interested to see what others find. Before you test, be sure to ensure the Pi does not have internet! In case you want to copy/paste, the command to edit the file is:
sudo nano /etc/chrony/chrony.conf

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Here's another question - how often does chrony sync the system clock to the GPS time? Where is the frequency of that sync set? Can we change it? If nothing else I'd like to simply see that code. I have read about the maxpoll command in chrony but don't know where it's used or how to apply it.

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Thanks in advance for your answers!
73 Joseph VE3GKT

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PS Thank you Jason for some awesome software! I use the Pi 4 8gb setup at home as my primary station, as well as for 100w POTA. I've used it a LOT - nearly all of my 1479 POTA digital QSOs have been with BAP. At home, I have a Kasa switch feeding my power supply. Combined with FLrig turning my IC-7100 on and off, and a free RVNC account, I have a primative but effective remote station! I have an LDG Z-11PROII feeding a 4:1 balun to a 40' doublet. I have QSOs on this home setup on every band 160m-2m!

PPS I just found the Config > UI > Meters Dialog in FLrig last week. It's quite useful!

开云体育

Hello,

I'll make this brief, I have no connection to the seller, but Dell Refurbished (link below) has 29 low-cost "thin client" laptops for sale.

The laptop has quad-core N4100 Celeron CPU, 4 Gigs DDR4 RAM (upgradeable to a max 8 Gigs by adding a 4 Gig SoDIMM), 16 Gig eMMC, a backlit keyboard, a 14" 1920x1080 display, dual-band WiFi and Bluetooth, as well as VGA & HDMI video ports and gigabit Ethernet. The laptop includes an m.2 NVMe slot that can accept a 2280 (or smaller) NVMe SSD BUT, I repeat, BUT, the owner will need to rig a means of securing the SSD, there is a bracket missing to properly secure the SSD - perhaps a replacement part from Dell can be purchased?).

There is NO included OS, no Windows CoA, no product key, if you want to run ANY version of Windows you'll need to supply your own license, obviously any Linux distribution should run fine.

The price, including Free Shipping in US is $59 + applicable sales tax (may not be available to ship overseas)

Link:



I have two, one runs Win 11 fine, the other is running Ubuntu Desktop 23.04 fine, fully-supporting the hardware.

Theres only a few left (29), but I thought some here might be interested.

These are full-size, not small, laptops - full-size keyboard, 14" display, etc. with hours and hours of battery life, but they do not operate on 12v, they can be powered over USB-C, according to the literature, they come with 19v power adapters.

Hope some here find this note helpful,

Ken, N2VIP

Of course. There was a lot of details mentioned in their blog post introducing the Pi 5, including this RTC battery.