I was having a lot of trouble routing audio between programs on Linux.

Pretty sure this is the wrong way to go about it.

But it works, and I want to write it down somewhere if I need to do it again :-)

I’m sure these config files are meant to go into your home directory…

/etc/pipewire/pipewire.conf.d/11-loopback-devices.conf

context.modules = [
    {
        name = libpipewire-module-loopback
        args = {
            audio.position = [ FL FR ]
            capture.props = {
                media.class = "Audio/Sink"
                node.name = "loopback-sink-1"
                node.description = "Loopback Virtual Sink 1"
                device.description = "Loopback Virtual Sink 1"
                device.class = "sound"
                device.icon-name = "audio-card"
                node.virtual = false
            }
            playback.props = {
                media.class "Audio/Source"
                node.name = "loopback-sink-1.output"
                node.description = "Loopback Virtual Source 1"
                device.description = "Loopback Virtual Source 1"
                device.class = "sound"
                device.icon-name = "audio-card"
                node.passive = true
            }
        }
    }
]

/etc/pipewire/pipewire.conf.d/12-loopback-devices.conf

context.modules = [
    {
        name = libpipewire-module-loopback
        args = {
            audio.position = [ FL FR ]
            capture.props = {
                media.class = "Audio/Sink"
                node.name = "loopback-sink-2"
                node.description = "Loopback Virtual Sink 2"
                device.description = "Loopback Virtual Sink 2"
                device.class = "sound"
                device.icon-name = "audio-card"
                node.virtual = false
            }
            playback.props = {
                media.class "Audio/Source"
                node.name = "loopback-sink-2.output"
                node.description = "Loopback Virtual Source 2"
                device.description = "Loopback Virtual Source 2"
                device.class = "sound"
                device.icon-name = "audio-card"
                node.passive = true
            }
        }
    }
]

And to restart:

systemctl restart --user pipewire

Just some random photos from a camping trip to Baairnsdale ealier this year.

(Golden Beach)

(Paynesville)

(Eagle Point)

(Mount Taylor)

I took advantage of the weather this weekend and went to Baw Baw Village to operate portable for several hours.

(IC-705, 4EL 2m antenna, and a 10EL 70cm antenna)

Radio conditions were pretty good on 2m. I got several great VK7 contacts on 2m which was fantastic. 70cm was a bit harder, and I struggled a bit getting the locals in the Melbourne suburbs.

(Unique 2m contacts)

(Unique 70cm contacts)

Furthest contact was VK7NW at 403km, on both 2m and 70cm. Fantastic.

Already looking forward to the next field day.

Last field day I went up One Tree Hill and while it’s a great spot (with lots of shade from the trees), most of my contacts were pretty nearby. So this time I decided to head further out and went portable on Anderson Hill road between Loch and Kernot (a little south of the summit of Anderson Hill and the radio rower).

The location has good line of sight towards melbourne, and also some great views. Even saw some birds of prey riding the air currents.

It was a very hot day, but thankfully several degrees cooler than it was in the city. After I setup the weather was fairly calm, but it didn’t take long until the wind picked up. At one point it pushed over my antenna, and broke my beach umbrella, and for the rest of the day I hid in the shadow of my car boot. Really needed a better solution.

I ran 10 watts and a horizontal 3 element 2m Yagi-Uda. The antenna was mounted to speaker tripod a couple of meters up.

In total I made 38 contacts over the 7 hours I was set up, and made some pretty decent contacts (all 2m SSB):

• VI75G in Geelong - 120km (75th Anniversary of the Geelong Amateur Radio Club)
• VK3IK in Wallan - 129km
• VK3ER in McLaughlins Lookout - 161km
• VK3KQ in Enfield - 183km

I could just hear VK7MD once or twice, but they would have had no hearing me with the conditions.

Was there until sunset, just as the mosquitos came out.

I’m really glad I went out, though I think I’ll take a little break for portable operations for a bit :-)

I had a wonderful time down in Wonthaggi this Christmas.

It felt like I was only there for a day. Very relaxing, and great food.

On Boxing day I went up to Bass Hill, just 20 min from Wonthaggi, to scout a possible location for the 2023 summer VHF/UHF field day. Was worth going just for the views. With my binoculars I could see the Toora wind farm about 65KM away.

Bass Hill is the location of the VK3RSG repeater, and while there is nothing too high powered on the tower, I will need to find a nearby location to reduce interference if I go up again.

That said, I was very lucky as the atmospheric conditions were perfect for VHF/UHF over the bass straight to Tasmania. The instant I turned on my radio I heard VK7MD/Mobile on 2m FM simplex. Incredible.

I talked to several other VK7 stations on 2m FM, 2m SSB and tried some 70cm FM too.

I’m still amazed at what can be achieved with <10 watts and a portable antenna. In the future, I will be keeping a close eye on the conditions for another opportunity.

After hearing reports that 15m was starting to open up, I built a very simple T2LT antenna based on the dimensions from Tim G5TM.

The SWR measured okay, lowest around 1.5. Initial tests looked good, but it was hard to tell as I have S9+ noise at home.

(SWR with ugly balun and ferrite choke. 8m fiberglass pole)

To really test it I needed to away from my local noise, so late Sunday afternoon I headed up to John’s Hill Reserve to try it out. The reserve is quiet, with little rf, and is a little over 400m ASL.

First issue was my Digirig disconnected every time I started to transmit. It took 30min of testing to finally realise that the “ugly balun” was not only ugly, but wasn’t working as a choke either; I was getting RF back into the laptop. Adding a ferrite choke at the end of the feed-line fixed the issue.

In the future I will have to remove the ugly balun, add a BNC connector, and maybe make a choke for 21Mhz. I think I’ll also take the time to play with the lengths to see if I can achieve a better SWR. Callum, M0MCX, has a calculator with different length ratios rather than the standard 1/4 + 1/4 wavelength design.

As for results, I’d say they were good.

(PSKReporter, all day FT8 15m)

It was hard to pick out SSB (though I did hear a few Japaneses stations), so I spent most of my time on FT8. There were lots of stations, and I appeared to be able to get out alright. Only made 14 contacts but they were from countries I don’t normally see on 40m including China, South Korea, England, and Ukraine. Very happy.

Oh, and the view was pretty nice too.

I did nothing all week, so late Sunday afternoon I decided to activate a park for the first time.

I went to Baluk William Nature Conservation Reserve (VKFF-2042) and setup my G90 and EFHW. It wasn’t far away, but I missed a turn, and Google Maps took me on a fun backroad.

Made 23 SSB contacts on 40m in about an hour. It was a bit nerve wracking at the start, but I think I kinda got the hang of it. Was very happy to make a ZL3 contact too.

Will have to pick another interesting park for next weekend.

I took part in my first contest this weekend; The Remembrance Day Contest.

This contest commemorates the Amateurs who died during World War II and is designed to encourage friendly participation and help improve the operating skills of participants. It is held on the weekend closest to the 15th August, the date on which hostilities ceased in the southwest Pacific area.

I headed up to John’s Hill Reserve in the afternoon and setup my G90 + EFHW, and made 20 contacts over about 3:30 hours. While I didn’t make many contacts, I was impressed that all but one station (VK2) was able to hear me on this setup.

Most of all, I think it was helpful in getting my confidence up when talking on the radio. I feel much better about trying to activate POTA now.

Update 2022-09-12

I placed 109 out of 126 for single-operator-phone.

No exactly great given the median was 100 contacts, and the top three all had over 1,000. But I’m still happy about what I achieved.

Went to new park in Mornington Peninsula with G90 and 40m EFHW yesterday.

I think I preferred it when I could only see 7-8 FT8 contacts each decode, now it’s hard just to find an open frequency.

The most messages I saw during one decode was 38.

Noticed 3 people doing POTA as well, I had never really thought about that. Maybe that’s a way I can avoid talking to people now that no one uses PSK31, or other digital modes.

It turns out the best way to play with radios is away from everyone else.

I tried to find if someone had made a map of noise levels around Melbourne, but couldn’t find anything. Instead, I used a light pollution map, with the idea being less light pollution = less background noise.

Last weekend I spent a couple of hours at night, at boat ramp 50km south-east of the Melbourne CBD. And my hypothesis seems to have checked out.

I took a 6m squid pole, a 40m EFHW (for 40-20-15-10) and an IC-705.

I sent out WSPR beacon on 40m @ 10watts (I think) to see how everything was working, and well, it seemed pretty good.

I was also being heard all over the place on FT8 which was nice.

Only made a handful of contacts via FT8, but three in NA, and one in SA which was cool.

Took the time to listen to the new Shortwave Australia Broadcast on 4835 Khz too. Wasn’t perfect, but was still pretty damn good. Had very poor reception on 2310 Khz though. I assume it was my antenna setup?

(Youtube mirror)

I tried to send some SSTV too, but had tech issues (and people were talking everywhere on 40m).

I wish I could do this from home, but I suppose it gets me out the house.