Aaaaaannd, we’re back! At the end just two extra radiators.

So, the reason why my previous setup broke was because we tend to have a lot of wind in the afternoon here. I live in a valley and many times the wind takes the valley as a tunnel through which it wants to multiply its wind force. So first the plexiglass supports broke and at the end the wires gave up as well. So i had to find something sturdier.

What i came up with is to make the supports from PVC pipe. This is what i did:

At the DIY store I bought 4m PVC pipe 20x2mm which I cut up in 25cm long pieces. These supports are 12-14cm wider than the ones i had before, just to avoid interaction between the wires. So the idea is to somehow mount these supports to the antenna and guide the extra wires for 10 and 20m through them. At the end of the spacer i drilled a hole to guide the wire through. But how am i going to mount the spacers to the antenna?

At the end of the spacer i cut out a “half moon” to prevent the spacer to turn and to make sure that the hole i drilled in the end is always aligned with the antenna, so the wires are guided properly.

To mount the spacers to the antenna i just drilled another hole, a bit bigger (5mm), i used a tie-wrap to fix the spacer to the antenna. I can assure you, this won’t move. Here’s another detail on how i did this. The tie-wraps on the wire is to prevent the wire from moving through the spacer and from the spacer to bend downwards and fold in case there is a lot of wind. Yes, it can be windy here.

The rest is history, just adjust SWR for the frequencies it needs to work on and lastly put it up in its final location.



This is what SWR looks like right now. Pretty cool, eh? 😉




Here’s the antenna in its final location. Let’s see how long this setup lasts this time.

Long time no hear, FT8, CW (again?), antenna kaput

Ok, so apologies for not having posted anything for a long time. Lots has happened, mostly work-related, not enough radio focus so nothing to write about.

Until last month when i found out that the makers of WSJT-X had invented a new digital mode, FT8. Awesome! Fast (15 seconds per cycle, so around a minute for a full QSO), convenient (auto-sequence makes that you only have to click twice, once to select who you want to contact and once to confirm the QSO in the log) and you can do it without even being at the PC.

So a few hundred contacts later i got the radio virus again. Same time i receive that i am selected for this autumn’s CW Academy course, so i will pick CW learning up again (let’s see how far i get this time).


Today i noticed that my SWR of my antenna was going haywire. I already lost one radiator before, the 20m one, today i lost the 10m radiator as well. So time to find some new spreaders, new antenna wire and to take down the antenna and fix stuff. Probably with more than 2 extra radiators.


[Solved] Crap ! I seem to have a USB buffering issue.

Take a look at this video:

Because of the bad propagation i was trying to make some QSOs on JT65 and i was not able to get any response from anyone. So, because i don’t use WSJT-X a lot and because its CAT always interferes with RUMlog and CubicSDR who also want a CAT connection, i just went over the initial setup again.

At some point in the manual it says: “Click the Tune button on the main screen to switch the radio into transmit mode and generate a steady audio tone. Listen to the generated audio tone using your radio’s Monitor facility. The transmitted tone should be perfectly smooth, with no clicks or glitches.” So that’s what i did and the above video showed. So what’s next? How do i solve this?

I tried with FLdigi to send a long PSK31 signal and the same behaviour shows. I tried with my old MacBook Pro and that one works fine. Crap! Can i not use any digital modes anymore now??

So i sent the following message to the Apple forums and to the Silicon Labs Community:

USB buffering MBP 2001 vs 2015?

I am a HAM and i am using my Early 2015 MBP for data communications. I seem to have a problem where the USB ports are not able to handle the traffic going from my software to the radio.

I am using a USB cable running at 115200 between my radio and the MBP. You can see the behaviour in this video:

In this video i first put a continuous tone on the USB port. The effect should be that the radio sends out this continuous tone on the air. However, as you can see in the video, the audio is interrupted and gets worse over time up to the point that the USB port is not receiving any data anymore and the transmit signal gets interrupted.

I tried this with various USB cables and various different programs and the behaviour is the same with all.

In the video you can also see that i am sending out a CW signal not using the MBP and that signal is clean.

Why do i think it’s the MBP? Because i tried a Late 2011 MBP running the same OS as my 2015 one (Sierra) this morning and that MBP doesn’t have the issue.


Any idea what has changed in the USB handling between 2011 and 2015?

Any idea how i can manipulate the buffering if the USB port on the 2015 MBP?


Thanks for your input,



No answers yet…


When i set the audio preferences in WSJT-X like this i don’t have the issue:


I opened a ticket with Silicon Labs explaining the issue and they have sent me a previous version of the driver. This version doesn’t show the above behaviour. So i’m a happy camper again.