Radiohyperactivity
@radiohyperactivity.com
New DIY project. Building an absolute position sensor and azimuthal map for rotatable antennas! Link in comments!
November 15, 2025 at 7:45 PM
New DIY project. Building an absolute position sensor and azimuthal map for rotatable antennas! Link in comments!
Ultimate LoRa APRS Tracker Upgrade | Heltec Wireless Tracker Build
YouTube video by Radiohyperactivity
youtu.be
October 10, 2025 at 1:48 PM
Winding down a month of testing aftermarket HT antennas with this round on telescopic antennas!
youtu.be/DjRqlYeA4es
youtu.be/DjRqlYeA4es
Telescopic Antennas: The Good, The Bad and The Ugly!
YouTube video by Radiohyperactivity
youtu.be
September 26, 2025 at 6:43 PM
Winding down a month of testing aftermarket HT antennas with this round on telescopic antennas!
youtu.be/DjRqlYeA4es
youtu.be/DjRqlYeA4es
This week I'm looking at short/stubby antennas, and comparing them to the stock antenna on the Yaesu FT5D. It's probably not going to surprise anyone that these are not very good antennas, but I will try to answer what I think is the relevant question: How bad can they be?
Video link in comments!
Video link in comments!
September 19, 2025 at 5:04 PM
This week I'm looking at short/stubby antennas, and comparing them to the stock antenna on the Yaesu FT5D. It's probably not going to surprise anyone that these are not very good antennas, but I will try to answer what I think is the relevant question: How bad can they be?
Video link in comments!
Video link in comments!
Join me as I build for this quick and easy build of the Powerpole Inline Volt Meter. If you have access to a 3D printer, wire, some Powerpole connectors and a couple of screws, this build will set you back less then 2 Euro/Dollar! Full bill of material and STL files on Github!
youtu.be/NGh-YLduTzk
youtu.be/NGh-YLduTzk
Building the Powerpole Inline Volt Meter
YouTube video by Radiohyperactivity
youtu.be
August 8, 2025 at 4:45 PM
Join me as I build for this quick and easy build of the Powerpole Inline Volt Meter. If you have access to a 3D printer, wire, some Powerpole connectors and a couple of screws, this build will set you back less then 2 Euro/Dollar! Full bill of material and STL files on Github!
youtu.be/NGh-YLduTzk
youtu.be/NGh-YLduTzk
Packet Radio: PacketCommander and Mobilinkd on the iPhone
YouTube video by LB5JJ
youtu.be
June 21, 2025 at 12:11 PM
2023-10-26: IS0/IS-303 Punta Berritta - Summits on the Air (Sardinia). Last summit of the expedition, and a proper drive-up this time. Drove to within a few meters of the activation zone and walked the last few meters. 29 in the log in 18 minutes running 20W from the FX-4CR.
January 12, 2024 at 9:25 AM
2023-10-26: IS0/IS-303 Punta Berritta - Summits on the Air (Sardinia). Last summit of the expedition, and a proper drive-up this time. Drove to within a few meters of the activation zone and walked the last few meters. 29 in the log in 18 minutes running 20W from the FX-4CR.
2023-10-25: IS0/IS-011 Monte Pipinari - Summits on the Air (Sardinia). Elevation 1398m. Another easy summit as long as you don't mind walking among grazing livestock. 45 minutes up and about the same back down. This was one of the few summits on Sardinia I didn't find a fence post to attach antenna.
January 11, 2024 at 12:54 PM
2023-10-25: IS0/IS-011 Monte Pipinari - Summits on the Air (Sardinia). Elevation 1398m. Another easy summit as long as you don't mind walking among grazing livestock. 45 minutes up and about the same back down. This was one of the few summits on Sardinia I didn't find a fence post to attach antenna.
2023-10-25: IS0/IS-009 Monte Armario - Summits on the Air (Sardinia). Elevation 1433m. Nice short walk from Arcu Correboi. About 40 minutes up and no more then 25 back down. But quite a bit of livestock grazing! The summits was difficult to reach, so I settled for the activation zone...
January 10, 2024 at 8:35 AM
2023-10-25: IS0/IS-009 Monte Armario - Summits on the Air (Sardinia). Elevation 1433m. Nice short walk from Arcu Correboi. About 40 minutes up and no more then 25 back down. But quite a bit of livestock grazing! The summits was difficult to reach, so I settled for the activation zone...
2023-10-24: Summits on the Air - IS0/IS-014 Punta Soleadduci (Sardinia). Elevation 1358m. Second summit of the day. This is also a potential drive-up, but there was a closed gate at about 1100m, so I left the car there. A little more then an hour waling up and a little less coming back down.
January 9, 2024 at 10:53 AM
2023-10-24: Summits on the Air - IS0/IS-014 Punta Soleadduci (Sardinia). Elevation 1358m. Second summit of the day. This is also a potential drive-up, but there was a closed gate at about 1100m, so I left the car there. A little more then an hour waling up and a little less coming back down.
2023-10-24: IS0/IS-012 Bruncu Olinie (Sardinia). Elevation 1370m. Easy drive-up. There's a gate some 100m below the summit. It wasn't locked, but it was closed, so I decided not to push my luck and walked the rest of the way up. Much livestock in the road on the way up and down...
January 8, 2024 at 8:09 AM
2023-10-24: IS0/IS-012 Bruncu Olinie (Sardinia). Elevation 1370m. Easy drive-up. There's a gate some 100m below the summit. It wasn't locked, but it was closed, so I decided not to push my luck and walked the rest of the way up. Much livestock in the road on the way up and down...
2023-10-23: IS0/IS-003 Monte Arbu (Sardinia). Elevation 1567m. Very nice walk and spectacular view. Spent about 1 hour 40 minutes walking up, but did not choose the best of tracks. If you go there from Arcu Correboi, choose either the track going over Monte Moddu e Littipori or the one closest to it
January 7, 2024 at 11:06 AM
2023-10-23: IS0/IS-003 Monte Arbu (Sardinia). Elevation 1567m. Very nice walk and spectacular view. Spent about 1 hour 40 minutes walking up, but did not choose the best of tracks. If you go there from Arcu Correboi, choose either the track going over Monte Moddu e Littipori or the one closest to it
2023-10-22: Summits on the Air - IS0/IS-302 Bruncu Spina. Elevation 1829m. This is the second tallest point on Sardinia and conveniently just a small de-tour on the way back from Punta La Màrmora. The walk was about one and a half hours with a stunning 360° view.
January 6, 2024 at 10:44 AM
2023-10-22: Summits on the Air - IS0/IS-302 Bruncu Spina. Elevation 1829m. This is the second tallest point on Sardinia and conveniently just a small de-tour on the way back from Punta La Màrmora. The walk was about one and a half hours with a stunning 360° view.
2023-10-21: Summits on the Air - IS0/IS-001 Punta La Màrmora (Sardinia). Tallest point on Sardinia with en elevation of 1834m. I was saving this one for a day with nice weather which was an excellent idea. Fantastic scenery all the way up. Walk from the the car park at Bruncu Spina was about 1:40.
January 5, 2024 at 3:19 PM
2023-10-21: Summits on the Air - IS0/IS-001 Punta La Màrmora (Sardinia). Tallest point on Sardinia with en elevation of 1834m. I was saving this one for a day with nice weather which was an excellent idea. Fantastic scenery all the way up. Walk from the the car park at Bruncu Spina was about 1:40.
2023-10-21: Summits on the Air - IS0/IS-006 Conca Giuanni Fais (Sardinia). Elevation 1499m. First ever activation of this summit. Nice ascent on forest roads; 50 minutes up, and 30 minutes down. 36 in the log in about 20 minutes running 100W from the FT891 into the 10m tall vertical LC-matched.
January 4, 2024 at 11:02 AM
2023-10-21: Summits on the Air - IS0/IS-006 Conca Giuanni Fais (Sardinia). Elevation 1499m. First ever activation of this summit. Nice ascent on forest roads; 50 minutes up, and 30 minutes down. 36 in the log in about 20 minutes running 100W from the FT891 into the 10m tall vertical LC-matched.
2023-10-20: Summits on the Air - IS0/IS-004 Punta 'e s'Abile. Elevation 1554m. Second summit of the day, and a great deal more effort. I parked the car and about 1500, elevation, and the summit is at 1554m, so it sounded easy enough. Only problem was the 200m counter ascent from where I parked...
January 3, 2024 at 9:10 AM
2023-10-20: Summits on the Air - IS0/IS-004 Punta 'e s'Abile. Elevation 1554m. Second summit of the day, and a great deal more effort. I parked the car and about 1500, elevation, and the summit is at 1554m, so it sounded easy enough. Only problem was the 200m counter ascent from where I parked...
2023-10-20: Summits on the Air - IS0/IS-002 Monte Spada (Sardinia). Elevation 1595m. First summit of my Sardinia expedition, and a quick walk. 30 minutes on the way up and 20 on the way back down. 56 in the log in about 35 minutes with the FT891 and the 10m tall vertical LC-matched to 20m.
January 2, 2024 at 8:37 AM
2023-10-20: Summits on the Air - IS0/IS-002 Monte Spada (Sardinia). Elevation 1595m. First summit of my Sardinia expedition, and a quick walk. 30 minutes on the way up and 20 on the way back down. 56 in the log in about 35 minutes with the FT891 and the 10m tall vertical LC-matched to 20m.
2023-10-10: Parks on the Air - K-2059 Gantry Plaza State Park. Took my son to New York for a week, and had to shoehorn in at least one activation. We walked from Times Square down to the East 34th Street terminal and took the 8 minute ride across to Hunters Point on Long Island.
January 1, 2024 at 7:25 PM
2023-10-10: Parks on the Air - K-2059 Gantry Plaza State Park. Took my son to New York for a week, and had to shoehorn in at least one activation. We walked from Times Square down to the East 34th Street terminal and took the 8 minute ride across to Hunters Point on Long Island.
2023-11-24: Summits on the Air - LA/OF-002 Tremannsrøset. Elevation 182m, crisp Norwegian autumn day. Extremely easy summit, especially before snowfall. You can drive to within 500m of the summit by taking the logging road from Kolstad. 30 in the log in 20 minutes with 20W from the FX-4CR.
December 31, 2023 at 1:19 PM
2023-11-24: Summits on the Air - LA/OF-002 Tremannsrøset. Elevation 182m, crisp Norwegian autumn day. Extremely easy summit, especially before snowfall. You can drive to within 500m of the summit by taking the logging road from Kolstad. 30 in the log in 20 minutes with 20W from the FX-4CR.
2023-12-14: Summits on the Air - LA/OL-047 Venehaugane. Elevation 692m, temperature - 15°C. Easy summit, a clear drive-up in summer and even in winter if the road's been cleared and you have 4 wheel drive. I don't, so I didn't. Nice walk, but sadly all fogged in, so not much in the way of a view!
December 30, 2023 at 10:55 PM
2023-12-14: Summits on the Air - LA/OL-047 Venehaugane. Elevation 692m, temperature - 15°C. Easy summit, a clear drive-up in summer and even in winter if the road's been cleared and you have 4 wheel drive. I don't, so I didn't. Nice walk, but sadly all fogged in, so not much in the way of a view!
2023-12-14: Summits on the Air - LA/OL-043 Buhammaren. Elevation 549m, temperature -12°C. Easy summit, even for winter activation. 1.5km from the car part to the summit and only about 125m of elevation. 17 contacts in about 10 minutes with the FT-891 and 10m tall LC-matched vertical on 20m.
December 29, 2023 at 9:07 AM
2023-12-14: Summits on the Air - LA/OL-043 Buhammaren. Elevation 549m, temperature -12°C. Easy summit, even for winter activation. 1.5km from the car part to the summit and only about 125m of elevation. 17 contacts in about 10 minutes with the FT-891 and 10m tall LC-matched vertical on 20m.
2023-12-25 Parks on the Air - LA-1567 Presterødkilen Nature Reserve. Temperature -10°C, 12 in the log with the IC-705 running at 5W into the 10m tall vertical LC-matched for 20m. Also tested out the AH-705 tuner, but suspect I had some issues with RF finding its way back into the radio.
December 28, 2023 at 2:12 PM
2023-12-25 Parks on the Air - LA-1567 Presterødkilen Nature Reserve. Temperature -10°C, 12 in the log with the IC-705 running at 5W into the 10m tall vertical LC-matched for 20m. Also tested out the AH-705 tuner, but suspect I had some issues with RF finding its way back into the radio.
2023-12-26: Summits on the Air - LA/OL-044 Brandbukampen. Elevation 522m, temperature -12°C. About 60 minutes walking up on snow shoes, and about 30 minutes coming back down in boots. Magnificent view from the look-out point about ⅔ of the way up. 23 in the log in 12 minutes on 20m SSB...
December 27, 2023 at 1:10 PM
2023-12-26: Summits on the Air - LA/OL-044 Brandbukampen. Elevation 522m, temperature -12°C. About 60 minutes walking up on snow shoes, and about 30 minutes coming back down in boots. Magnificent view from the look-out point about ⅔ of the way up. 23 in the log in 12 minutes on 20m SSB...