Tag Archives: 70 MHz

Sporadic E and a tale of the unexpected

MOONRAKER 70MHz Base Vertical Antenna

An exciting couple of days after my previous post about working the Spanish station on 4 metres!

Yesterday things started to happen on 144 MHz and in just over 20 minutes from 1510z I worked IK0FTA, IK0SMG, IK0RMR, and IK0BZY all in JN61, all 59. I did not hear anything else in terms of DX on the band though some other stations did. I felt pretty pleased with this “haul.”

Then, much to my surprise (again) having gone back to 70 MHz for a look just after 1800z I worked 9A2SB (JN95) and 9A1Z (JN86). My 50 watts SSB and small Moonraker vertical are doing well, far better than I hoped. I think I rather like 4 metres. I certainly did not expect this sort of DX on 4 with the antenna I have, but this is terrific! I have worked just four squares and three of them are rather distant, and 9A2SB is nearly 1,500 km away.

One giant leap on 70 MHz

Moonraker vertical antenna SQBM412

As I mentioned last time, I purchased a small vertical antenna for four metres. It is the Moonraker SQBM412. A friend of mine, Mike, G8EFG kindly installed it on my garage roof a couple of weeks ago, and it is only less than four metres above ground, although my QTH is quite decent for VHF.

Activity is lower than I had hoped on 70 MHz and I had managed to find just one station which was an FM contact. Then last Friday, 3rd June I heard a station on SSB calling CQ at about 30 miles distant. He was very weak. I called him but he either did not hear me or he was looking for DX as there seemed a possibility of Sporadic E propagation for better appointed stations than mine.

Then tuning around I heard EA4CZV calling CQ DX and I called him more in hope than expectation. After some persistence on both sides we completed the SSB contact and I have IN80 as a new square and actually only my second one as the other is the guy down the road I worked on FM.

Of course, with a vertical and not a yagi I have little or no antenna gain but maybe the polarisation factor is less critical at this sort of distance, which was 1280 km, not to be sniffed at.

I am therefore very pleased with the antenna and have said so in my review. Maybe I can work some more DX with it on four metres. It is going to be fun trying!

Progress re 70 MHz

I have put my money where my mouth is as they say and have purchased a small vertical antenna for four metres, or 70 MHz if you prefer. I have also acquired a stand to put it on, with a short pole to which to clamp it. I just need some help to put it where I want it, so that is the next step.

Of course, a small vertical is quite modest as opposed to a yagi for 4, but with the Sporadic E season coming up I might work a little DX, especially as polarisation may not be critical over the long paths of Es propagation. I hope I will be on the air in time to find out, with my IC-7100, which is still in the box it came in. I shall see…

I also look forward to working stations in the UK too. I gather activity is not high, but there are apparently pockets of amateurs active in various localities. I certainly want to give 70 MHz a good go and will put on my thinking cap about 50 MHz too.