Fasten your seat belts for FT8 @ camp

Early in the morning of the day that my XYL and I left for our most recent camping trip I was making a quick pass through some of my favorite Amateur Radio blogs and came upon a post by Bas, PE4BAS and another post by John, AE5X regarding the new WSJT protocol\mode, FT8. In John’s post he graciously referenced my recent post on PSK31 with my KX2 as an example of QRP portable digital operation. I had already packed my equipment in order to operate PSK31 from camp but I thought that I may as well try FT8. I pulled out my PC and installed the beta version of WSJT-X. I didn’t have enough time to setup the KX2 to check configuration and test so I figured that I’d just wing it at camp.

The second day at camp dawned bright and beautiful, perfect weather for digital operations. After a nice breakfast I pulled out my equipment to have a go at FT8. I quickly placed one end of my LNR EF-Quad well up in a tall fir tree and setup the KX2 and laptop. When I originally setup for PSK31 with my KX2 I used an older Toshiba laptop however the battery in that laptop would not hold a sufficient charge so I switched over to another old laptop that I purchased a few years ago at a local Hamfest with the intent of setting up a dedicated WSPR station with my IC-718. This never happened and in the face of my new WSPRlite transmitter it’s not likely that it will so I decided to use it as my portable digital PC. It is a bit more compact than the other laptop and as a result the keyboard is a wee bit smaller, but it’s still reasonably serviceable.

In order to confirm that everything was setup correctly as far as the general PC\radio interface I made a quick test with Fldigi and PSK31 using the same USB soundcard I described in an earlier post. This resulted in a couple of very nice QSO’s with N1ZQ who was operating portable in the White Mountains of New Hampshire and KA3OCS in Virginia. Both stations were very considerate of me being new at PSK31.

Fldigi PSK31 @ camp

With general functionality confirmed I shut down Fldigi and started up WSJT-X. Within a minute I had the interface to the radio and audio setup, selected FT8 on the Mode menu, and with a click of the Monitor button WSJT-X was receiving and decoding FT8 on 20m.

WSJT-X FT8 @ camp

WSJT-X configuration was as follows with the KX2:

WSJT-X radio config with KX2

WSJT-X audio config

This was my first experience with WSJT-X having never operated with either JT9 or JT65 in addition to the new FT8 mode. If you’ve not seen FT8 in action before, let me tell you that it moves very very quickly. The Band Activity pane filled quite rapidly and scrolled along at a rather brisk pace. I observed the activity for a wee bit to get a feel for the flow of activity and then attempted to respond to some CQ calls. After a few attempts I was rewarded with my first FT8 QSO, N4ULE. It was over before I knew it!

First FT8 QSO, N4ULE

When it comes to FT8, as Briscoe Darling once said, “Just jump in where you can and hang on…

In fact if there was a theme song for FT8, it may well be Doug Dillard playing “Banjo in the Hollow” as in the video. FT8 moves right along, just like Doug’s pickin’.

The KX performed as expected, flawlessly. The CAT interface with WSJT-X functioned without an issue. The KX2 mode was DATA A. I’ve read a number of threads on the heat sink temperature rise with digital operation with the KX2\KX3. In the KX2 manual Elecraft states to reduce power to 5W so that is where I set the power. Depending upon the ambient temperature and operation my KX2 sits around 21-25 C. It was about 78 F\25 C at camp and I saw the heatsink temp peak at around 34 C after several rounds of transmission. It would quickly rise and as quickly descend at the end of each transmission. I don’t know what the foldback temperature is for the KX2. I will monitor the power output with my OHR WM-2 the next time I operate FT8 and digital modes in general to see if I hit the foldback in normal operation.

Given our position in Cycle 24, recently purchasing a shiny new QRP rig might not have been the best timing but digital modes seem to be on the rise. They mostly certainly provide new opportunities to make contacts and expand the frontiers of Amateur Radio. Like all of the other modes, some old, some new, they are another tool in the toolbox. My initial impression of FT8 is positive and while it will take a little practice to get used to the pace, my guess is that there will be some more operation with FT8 and my KX2 in the future.

UPDATE: Bas, PE4BAS asked a good question in the comments, that being time synchronization for the PC. I forgot to add this into the original post. WSJT-X requires a means for synchronizing the computer clock to UTC within ±1 second. Thankfully my XYL’s cellphone has service when we are at camp so I used that to access the US Naval Observatory time service at Using this reference I updated the PC clock manually. Lacking a data service I would have used WWV. This Genesis Radio site has a very nice list of time signals around the world. If the PC was connected to the Internet I’d use NISTIME 32 (scroll to the bottom of the page for the download), which is what I use on my home QTH PC.


10 responses to “Fasten your seat belts for FT8 @ camp

  1. Great to read your outdoor experience with FT8. The laptop you use is exactly what I have in mind for my outdoor operating. How did you synch the time of your laptop? 73, Bas

    • Thanks Bas. You raise a good point that I’ll update in the post. Using my XYL’s cellphone I was able to access the US Naval Observatory time site, I used that reference to sync the PC clock manually (right-clicking the clock in the systray and selecting “Adjust Date/Time.”) It appeared to work. 73, Tim KA9EAK

  2. I’m really glad you were successful in using the KX2 with FT8 – you should post a link to this posting to the Elecraft reflector. I just posted of my own RV+radio plans to my blog and wish I’d read this first as you have me thinking about replacing the KX2 that I foolishly sold a few months ago.

    Thanks for the informative posting.

    • Thanks John. I went over to the Elecraft forum and it just so happens that there is a thread from a few days ago regarding the very topic of configuring WSJT-X\FT8 for use with the KX2. I’ve added my comments.

      Regarding the sale of radios, I’ve been thinking about selling my FT-817 now that I have the KX2 but I know that I’ll regret it right after it’s gone. I do like the VHF\UHF capability and now that I’ve sorted out a portable VHF\UHF antenna the 817 will likely see more action. Plus, I’ve seen videos of people using them for satellites so now that my Elk log periodic is portable satellite operation is now on the list.

      I’m certain that Elecraft will sell you another KX2. : )



  3. Hello Tim, most android phones have a WiFi hotspot ability you can use to connect with the internet. That way you can sync your time with the known tools (like nettime etc.). Another way is to sync with a (USB or bluetooth)GPS receiver, I recently wrote about that in my blog. Good luck. 73, Bas

    • Thanks Bas. Unfortunately my wife’s phone is very basic and doesn’t have the capability to be a hotspot. Using a GPS however is a great idea! I just read your post regarding this and will be getting one of those devices ASAP.



  4. For mode, DATA A is a better choice than USB. DATA A is USB with TX EQ, RX EQ, and compression turned off. That allow you to keep a good voice setup in USB mode and still be ready for digital.


    • Thanks Walter, yes you are correct. I was using DATA A when I first setup for PSK31 but the mode switched somewhere along the way. I don’t use any TX or RX EQ but I do use compression. Thanks for the reminder!



  5. Hi Tim and THANKS AGAIN for the help with my new KX2 on the Elecraft list. My WSJT-X is set to mode USB and split RIG. KX2 is in USB and it’s been working fine! Having a ball with a meager 10 watts! Such a fun mode!
    Tom – KB2SMS

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