Radiowavz 40M Dipole Antenna

Today's vacation day activity was to put up a Radiowavz 40M dipole. I got it in trade several years ago for an AR15 lower receiver. :)

Hams know that antennas offer better performance when erected in crappy weather, ideally a New England winter day. Not having one of those handy, hopefully a hot-as-balls SE Pennsylvania day will suffice.

It's currently supported on both end but not the middle, which as you can see, sags a bit. The end supports are 5 foot lengths of schedule 40 PVC pipe with an eye bolt on the end. Braided dacron cord is strung through each eye bolt and then secured to the end insulators of the antenna with a bowline knot. The halyards are then attached to a large plastic landscaping stake in the ground.

The feedline is a 25 foot piece of RG-8X coaxial cable running to an MFJ-4602 window pass-through panel.

After it was up and connected I texted a couple friends and we tried it on 80M phone using NVIS propagation. I was able to hear them but they could not hear me, which wasn't surprising.

I'd like to get the middle up higher so I'm going to look into a military surplus fiberglass mast. If I get the center elevated the resulting antenna will be an inverted-V, which will give me better performance.

I haven't made any QSOs on this antenna yet, but this screenshot from pskreporter.info shows the results of calling CQ with 50W on JS8.

And this one from WSPRnet.org shows the results of transmitting 50W on WSPR.

HP Laptop for Emcomm, First Impressions

I've been getting back into ham radio lately and have a trip upstate planned for Memorial Day weekend. The two friends I am going with are also hams, so one of the activities we like to do in the evening is off-grid communication practice.

My specific interest is in digital mode communications, which requires either a mobile device or a computer to connect to the radio and run various applications. For field ops in the past I've used an iPad and an MSI Wind netbook. I traded in the iPad a year or two ago and the netbook is ancient at this point (plus has a small 10" screen) so I wanted something better.

My normal computer is an Apple MacBook Pro. However, I am not enthused about bringing a $3,000 laptop into the field, plus it seems like a lot of ham apps are better supported on Windows or Linux.

So, Friday after work I went down to Microcenter and picked up an HP 15-ef1072nr 15.6" laptop running Windows 10 Home for $400. The specs are decent for the price, IMO:

• Dual-core AMD Ryzen 2.6 GHz CPU
• 8 GB RAM
• 256 GB SSD
• AMD Radeon 3 graphics

As expected, the hardware feels a lot cheaper than my MacBook Pro. The Mac's case is machined from billets of aluminum. The HP's case is plastic. The keyboard is mushy but usable. The screen is nowhere near that of the MacBook Pro. Overall, the HP is much lighter than the MBP, which is nice.

Battery life seems good. It was partially charged when I brought it home. I plugged it in while setting everything up but then rant it down to around 10% over the course of several hours with web browsing, YouTube, and email. I repeated that on Saturday and probably got a good 7 hours before it went into battery saver mode.

The huge trackpad on the current MacBook Pros really spoils you and it is missed on the HP.

The HP's space bar is annoying. Pressing it towards the right end doesn't do anything. I tend to press the space bar with my right hand so this is a PITA and hinders typing.

Of course, one of the things I had to do was get Windows updated. Compared with Apple's macOS updates, Windows Updates remains a major PITA with multiple reboots required. Overall, it takes a lot more time.

It has been quite awhile since I used a Windows PC for desktop computing although I ocassionally have to login to a Windows server at work so the UI isn't totally unfamiliar.

Anyway, after cleaning up some of the factory-installed bloatware I loaded a number of utilites to make life easier:

• Notepad++ (In which I wrote most of this. On Mac, I use BBEdit.)
• Piriform CCleaner
• Piriform Speccy
• Replaced the pre-loaded Office 365 with Office 2019 Pro Plus
• Visio 2019
• Google Chrome
• iCloud for Windows so I can sync bookmarks with my Mac and iPhone
• nmap
• Wireshark
• Windows Subsystem for Linux with Kali Linux installed
• Signal
• ZOC terminal

And these ham radio apps:

• Fldigi
• JS8Call
• WSJT-X
• Chirp (For programming my Icom 7200, Yaesu FT-817ND, and Baofeng HTs)

The two Apple applications I'll miss most when using the HP are Messages and Facetime, neither of which are supported on Windows.

Incidentally, Microcenter limited the number of people in the store at a time, you had to wear a mask, and before going inside you had your hands sprayed with sanitized by an employee. Also, they are not taking cash, only credit or debit cards.

Testing a New Laptop for Ham Radio and WSPR

I picked up a cheap HP laptop at Microcenter on Friday to run ham radio apps on in the field. I'd rather not take my $3,000 MacBook Pro camping, plus it's a fact that a lot of ham radio apps are better supported in Windows. Should something bad happen, it'll be a lot easier to swallow with a $400 laptop.

Anyway, today I was configuring the HP to work with my Icom 7200 using Fldigi, JS8Call, and WSJT-X, and tried out transmitting using the latter in WSPR mode. The antenna was my Hawaii EARCH 40-6M end-fed, strung approximately horizontally out to my back fence. This is far from optimal.

I transmitted on WSPR at 50W a few times and checked propagation using WSPR Watch on my iPhone. Not bad.

Along with a couple friends I'm heaing up to Tioga Country next weekend. We're all hams and off-grid operations are on the list of activities. One thing I want to try is a random-length loop antenna using welding wire, connected to my antenna tuner using an LDG 4:1 balun. My friend did this a couple years ago and it worked great, allowing him to check in on a north PA/south NY 160M net.