SOTA in the Fisherfield wilderness: home to the UK's most remote midges!

A SOTA trip to some of the most remote mountains in the UK with river crossings, relentless rain and regrettable midge encounters.


A’Mhaighdean and Dubh Loch

Day 1 – The Big Walk In and Beinn Lair (GM/NS-027)

The trip began on a surprisingly hot and clear day, not what you’d expect on the west coast as i heading into one of the UK’s most remote areas. I cycled the first part of the route with Shadow (loyal companion and chief morale officer), who rode comfortably on my rucksack while my pack was carried on the panniers.


Shadow just Cruising

Progress was interrupted by a snakebite puncture, which delayed things while I carried out a repair. I haven’t had one of these in a long time, and forgot that they come in pairs - and only repaired one :joy: but we were soon moving again.

At the base of Beinn Lair (GM/NS-104), I stashed most of the overnight gear and began the ascent. It’s a fine Corbett, with a steep and dramatic northern face overlooking a hidden valley, Gleann Tulacha, an impressively remote summit that felt every bit the part.


Beinn Lair

At the summit, I quickly set up for VHF. This was the first real test of a new collapsible 2m Yagi that I’ve designed and 3D printed, with the aim of being lightweight and packable. It performed very well, enabling a solid 5W contact with GM4OAS in Mallaig that wouldn’t have been possible otherwise. I also had a good summit-to-summit QSO with @MM7MOX/P, who was activating GM/WS-178.


2m 3D printed collapsable Yagi in action.

HF conditions weren’t great, and I quickly gave up after only a few contacts. I didn’t hang around for too long the midges were out and so were the clegs.


Causeway across to Cairnmor

One summit down, plenty of midge bites banked already, and a forecast sent via Iridium from @MM0EFI suggested the good weather wasn’t going to last.


Evening – Carnmore

After the activation, I continued on to find a camping spot near Carnmore. I got set up and had some rehydrated slop for dinner. Conditions, however, were far from idea; too hot inside the tent, and not enough breeze to keep the midges at bay outside. After a frustrating spell trying to get comfortable, I decided to take a walk down to the bothy.


Camp

There, I was greeted by an unexpected but very welcome sight: a group of fishermen from Dundee who had been staying in the lodge all week while touring the lochs. I’d arrived just as they were working through the last of the week’s supplies; which included a generous amount of food on a fire and alcohol.

I was quickly invited in and couldn’t refuse the hospitality, nor could Shadow, who immediately made himself at home right infront of the BBQ. It turned into a brilliant evening of good food, conversation, and company in one of the most outstanding valleys in the UK. Sincere thanks to a great bunch of random fishermen from Dundee who turned what could have been a very uncomfortable night into one of the highlights of the trip.


Day 2 – Beinn a’Chaisgein Mòr (GM/NS-028)

The plan for the day was to activate two very remote peaks: Beinn a’Chaisgein Mòr (GM/NS-028), followed by A’ Mhaighdean (GM/NS-013), the most remote Munro in the UK.


*A’Mhaighdean and Ruadh Stac Mor in the clouds

I woke to the sound of heavy rain on the tent. MM7MOX had given me a heads-up the previous day via VHF about morning showers, and he was absolutely right. I decided to leave the tent in place at Carnmore and travel light to the summit of Beinn a’Chaisgein Mòr.

The weather on the approach and summit was very poor — constant, driving rain and strong winds. There’s no natural shelter on the summit, so I found a large rock and did my best to hunker behind it during the activation. It was one of the most difficult conditions I’ve ever operated in.


45 degree Pole deployment and a flapping wire

Hoping to qualify on 2m VHF, I only managed two contacts, so I set up HF. In the conditions, I had to compromise: the antenna was just a wire flapping in the wind, supported by a handheld mast at roughly 45 degrees. The antenna kept detuning in the gusts, but with some persistence, I managed to get a good few contacts through. Huge thanks to everyone who worked me: it made all the difference.


Descent and Return

After descending from Beinn a’Chaisgein Mòr, I made my way toward A’ Mhaighdean (GM/NS-013), but decided to call it. The weather was worsening, huge amounts of water were being unleashed at times, I was soaked, tired and not in the right headspace to push further. I turned back towards camp at Carnmore. On the descent, the views opened up to remind me how awesome this place is !

From there, I began the long 24 km journey back to the van. And as the day wore on, the rain became relentless.


Driving rain across Dubh Loch

River levels had risen significantly, and many of the smaller crossings were now in full spate. One river, in particular, was right at the edge of what I’d consider safe to cross. It took two crossings, one of which involved carrying Shadow in the rucksack.


River crossing - at the limit

Unfortunately, I lost my 2m collapsible Yagi during the crossing. Not the end of the world — I’ll just print another one !

A fantastic couple of days in this unique wilderness!

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Meant to be the longest cliffs in the UK… OK I’ve given up trying to post a link to some nice photos… Google it yourself!

Most remote Munro? OK, you didn’t do it this time… now you have a really valid reason to go back and do it. The visual treat is enough to make you want to visit Fisherfield/Letterewe even if I feel the summits maybe beyond what I can do. But you can get me more pictures when you visit again :slight_smile:

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This was meant to be a second visit to the Maiden, A’Mhaighdean

That it is - here is a much younger looking GM5OLD in much better weather

Yes, very very impressive - check them out…

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That’s the kind of photo I was looking for :slight_smile:

There’s an amazing feel to even your bad weather photos.

Morven GM/NS-067 is only a 3.5hr walk from the car to the summit and it’s defeated me 3 times now. Two fails on A’Mhaighdean is nothing in comparison!

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Great report Tim. Scotland might not have the highest hills in the world, but it can still provide a serious challenge!

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I’ve got some great photos from that spot on a similar weather day… only problem is they are on colour slides… I really must get around to digitising them… only about 3000 to do :roll_eyes:

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Wonderful photos - well done for taking pictures in bad weather as it usually seem to be too much bother to get the camera out when everything is already soggy (especially as my ‘super’ Rohan coat has the camera pocket inside the main zip instead of outside it - I should never have bought it.) I am very interested in the 3D printed 2m yagi - how about printing an extra one…??? How heavy is it (or was it?)
Keep up the good work.
Viki

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I can’t believe you lost the yagi on its first outing!

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:rofl::rofl::rofl: I can’t believe it either !!! Time to put the fibreglass boom plan into action ….

Here it is on the beach. I’ll write an article about this, ironically the main weight is in the boom and if I switch to a fibreglass boom ( I now have the opportunity :rofl:) I recon we are about 240g for everything, elements, feed, T and boom.

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A business opportunity beckons… beam antennas for SOTA… what should you call it?

I think this is how @G3CWI got started making stuff. Ironically they eventually got dropped from the product line.

I’ve still got one of the original ones that also came with 70cm elements you could swap into alternative fixing holes which are 90 degree offset to avoid confusion. I don’t think you could have both elements in place at the same time.

I stopped using it primarily because it was a pain to use in any wind. No matter what I tried it would always “weathercock” around. Plus the mast head force was a lot greater.

@M6BWA the alternative, since the changes to the foundation licence power limits, is to carry a small mobile radio rather than a handheld and put out a bit more power through your existing omnidirectional set up. Obviously you also then need a battery… weight penalty might be too much.

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An excellent report Tim and some super photos.

You are a better man than I, Gungadin. I would have been totally miserable getting soaked without a comfortable Travelodge room (hot shower and comfy bed) to go to. I guess I’ve got soft in my old age… or maybe I always was.

It’s a shame that HF conditions have been so dire of late. No opportunity to work you from here. At least my invisible Faraday cage is working.

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Love it… I will certainly open source and put an article together…

Perhaps those more qualified than me can tell me the best way to feed the coax when operating vertically ?!

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It is stressful on the west coast not knowing if you’ll get enough on VHF or HF. Some thanks to the hebredian VHF operators and those HF station’s that defy physics such as F4WBN.

I am sure it will improve with time… along with my motivation for the next remote peak. Thinking Ben Aden GM/WS-122. Another collectors item!

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Well no doubt it will be waiting until I have left Skye before it improves. … that is assuming I actually get consent to activate a summit or two while we are there. There are some very tempting low hanging fruit not far from where we are staying, but sneaking out at midnight will probably not be the best approach to get around the consent issue. :rofl:

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It’s a known issue but normally people are using a metal mast/pole to support the antenna and running that up amongst the elements makes it worse than the coax’s effect. You need to run the cable for at least 1.4wave away from the boom before allowing it to become parallel to the elements. Easier said that done :wink:

This is how Diamond Antenna solve the coax feed affecting the radiation pattern of a vertical 2m Yagi, they stand the Yagi off from the support by 1/4wave. That’s going to put a nice couple on the mount and mast.

I think you can run the coax along the boom and the run it out at least 1/4wave behind the reflector (extend the boom to support the coax) before you let it fall.

AFAIK, the coax amongst the elements will affect the pattern and is likely to produce some lobes and spoil the directivity. By how much? Don’t know, model it and see. It maybe that the effect on such a small antenna is less than the effort needed to fix the issue. YMMV

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Just thinking aloud - a few years ago (following a thread on here) I set my 70cm yagi at 45 degrees eg between horizontal and vertical. This was to work stations with H or V antennas without faffing about at my end. It worked well, I think the theoretical polarization loss is quite small.

I wonder if this would also reduce the “dangling coax” effect to any useful extent…?

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Theoretically an antenna at 45 degrees is 3dB down on horizontal and vertical polarisation. The loss between horizontal and vertical (and of course vice versa) is 20dB, so considerably worse.

I have mounted antennas at 45 degrees and they look awful… but then when you’ve been a designer all your working life, I suppose that is inevitable. :joy:

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Well to answer some of these question i decided to install some antenna modelling software to try. One hour later, completely baffled at how to make it work, I gave up. Them sizing is from the 100g yagi:

Element Lenght (mm) Position (mm)
Reflector 1010 0
Driven 995 460
Director 1 900 660
Director 2 840 990

I’ll probably try and run the coax behind the reflector… seems like the best bet?

That’s another one of those amateur radio “rules” that doesn’t apply to SOTA activators. Along with, QRP DX, low slung HF antennas and carbon poles detuning vertical wires.

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Much like the number of radials needed and their height above ground for verticals :slight_smile:

Having the coax run parllel to and in the vicinity of the elements will have an effect. Just how much an effect depends on many things like the type of ground and the antenna height above the ground. If you can minimise it for no great effort then you do it. And if you can’t then you don’t.

Or you could solve all the problems of getting the signal to the antenna by connecting it to the radio with a Bluetooth link. :thinking:

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