500km (310 miles) on the 2.4 GHz and 3.4 GHz Ham Radio bands!

23cm, 2.4/3.4/5.7/10/24/47 GHz and above - antennas, propagation, operating, etc. Includes Optical communications, with light,
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VK7HH
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500km (310 miles) on the 2.4 GHz and 3.4 GHz Ham Radio bands!

Post by VK7HH » Thu Oct 24, 2019 7:29 pm

Last night, 22nd of October the Hepburn charts had a prediction of strong to very strong tropo ducting enhancement over Bass Strait. I promptly got in contact with Rod VK3BQJ and Geoff VK3KGR to attempt a contact from Mt.Wellington near Hobart.

Once I arrived after work (at approx 6pm) I could immediately hear the VK3RGI beacon on 2403.434 MHz, faint but there. Richard VK7ZBX joined me on site and we attempted a contact with Rod and Geoff. Neither could hear us and we even attempted digital to no avail. Convinced that the conditions were there and likely to improve as the sunset, we made a decision to try once more before packing up at 8pm.

Whilst we waited around for conditions to hopefully improve, we setup 3.4 GHz to monitor the VK3RGI beacon on 3398.434 MHz. With some tweaking and good ears we could at times hear the beacon in the speaker of the radio and could clearly see a trace on the waterfall.

Then around 7:30pm we got a call from Ralph VK3WRE who said he was intending to go portable to work us from Mt Tassie, 10km west of the 3RGI beacon site and higher. Richard and I decided to wait around and try a contact with Ralph who would take about 30 mins to get to his portable location. By this time the temperature was still 10 degrees, with an apparent temp of 1.4 degrees. Someone who shall remain nameless didn't think it through that wearing shorts would be a good idea! Whilst I put a jumper on, Ralph setup with Dean VK3NFI.

The beacon was exhibiting QSB fades over a few minutes, it would almost disappear then come back really strong. We attempted 2.4 GHz first and Ralph was a rock crushing signal 5/8. We exchanged details and decided to move to 3.4 GHz. We got the dish setup and roughly aligned (bearing in mind it is rather sharp). Well we didn't need Ralph to have the keyer on long, he was 5/8 again and arguably a better copy with no QSB. We didn't even have to peak the dish!!

We again exchanged details and decided to extend the national digital record on 3.4 GHz using FT8. I went to fire up the laptop - dead flat! We'd forgotten about it running all afternoon! I quickly said to Ralph I'd go and charge it up the road at the VK7RTC repeater site (lucky I had the keys). 15 minutes later of charge I returned. Ralph had been working several over VK3's on voice and digital.

Both Richard and I managed a FT8 contact with Ralph and the laptop promptly died 60 seconds after completing the contact!

This sets new records on 2.4 GHz for VK7 voice and 3.4 GHz digital nationally at just over 500km.

Thanks to all stations who made the time to participate.

Regards
Hayden VK7HH


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Re: 500km (310 miles) on the 2.4 GHz and 3.4 GHz Ham Radio bands!

Post by VK4AFL » Wed Oct 30, 2019 7:06 am

Hayden you guys nailed it a top effort & that record won`t be easy to beat!

73, Trevor, VK4AFL.

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