Playing With Amateur Radio

Category: Aerials

Contest Success

Well, I’ve had a bit better luck in the February, March and April UKAC contests.

I’ve not made a great deal of contacts – compared to some – but I’m on the scoreboard nonetheless.

In Feb, I used the FT-817, but as that only puts out 5W (actually only 4, when I measured it into a dummy load), I didn’t do particularly well, managing only a dozen or so contacts.

So, for March and April, I have been using my IC-7100, allowing me to use the full ten watts allowed for QRP operation. That pushed my QSO count up into the low twenties and I been most pleased to manage some fairly distant contacts, such as Cornwall and another portable station up in JO03 square, giving me those much needed bonus points. Not bad, I think, for 10 Watts into an aerial made out of plastic pipe and an old aluminium clothes horse.

Finding a spot up on the Downs to operate from has become tricky, though.  There seems to be a regular gathering of youngsters in their cars, taking up all the available parking spots. They give me strange looks as I set my aerial up on the grass verge and they are there all flippin’ night, too. I even saw pizza being delivered to them, last month!

Slinging the IC-7100 into the boot of the car – along with all the associated paraphenalia – was a bit of a mess and there was plenty of possibilities to get something wired up incorrectly in the dark, or lose a cable or something, so I decided I needed a tidier solution.

A Go Box seemed the obvious solution and the IC-7100 lends itself quite nicely to such an option – I’ve seen a couple of examples on the web.  However, I didn’t fancy trying to squeeze everything in to such a thing… and also the price of flight cases put me off.  All I need is something to keep it all together and make it easy to take in and out of the car boot.

And so, with a bit of chipboard from my daughter’s old wardrobe, I came up with the Go Board™

That’s it in the photo above.  Works a treat, and cost next to nothing.

Contest Fail

In an effort to be more active on VHF/UHF, I decided to have a go at doing the RSGB UKAC 2m contest, this year.

To ensure nothing went wrong, I spent the 2 days before the January contest, prepping.

I dug the 6-ele homebrew yagi (based on a clever design by M0UKD) out and checked everything was OK. In the midst of the detritus on the garage floor, I managed to find the portable 12V supply that I had made several years ago and had so far never used and I gave it a good overnight charge.

I would need a torch, so that was charged up too.

A decent run of RG58 was found and a new PL259 fitted on one end.

A short patch cable with a BNC to connect to the aerial was also located and put in the bag, along with the FT-817, along with a notebook and pencil.

On Tuesday night, I loaded everything into the car and headed up to Dunstable Downs.  I managed to find somewhere to park and then set about setting everything up.

It was freezing cold and a gale was blowing, making it difficult to erect the yagi on it’s 6ft pole, but I managed it.  It would have been easier, had I not forgotten the torch, which was still on charge on the kitchen worktop!

Back in the car, I rubbed my frozen hands together as I twiddled around the dial and I was pleased to hear plenty of stations coming in.  I grabbed my notebook and pencil and reached for the microphone.

Aargh, where was the microphone?

I’d left it in the shack. D’oh!

Still, we learn from our mistakes.

Hopefully.

At 10pm I decided I’d had enough and took the aerial down.  As I removed one of the guylines, a sudden gust of wind took the arial and smashed it into the ground, breaking two of the element mountings.

Oh well, roll on February.

Adapting

Back in 2013, I fitted a new Diamond X-50 colinear on the side of the house.  A 12 metre length of  UR67 coax connected it to the radio.

Now, the X-50 came fitted with an N-Type socket and when I mentioned at the local emporium that I’d never made up an N-Type before, I was advised that they were a bit fiddly and it would be easier to use an N-Type to SO239 adaptor.

So I did.

It all worked really well and was certainly an improvement over the Slim Jim I’d had years before.

But over the years, I noticed a drop in performance. GB3HR, which I had been able to get into with little problem,  slowly slipped into the noise and eventually became unreadable with me.  At first, I thought this was due to the repeater owners reducing selectivity, to try and prevent the troll that sits on there from getting access.  But then I noticed other issues.

Eventually (two weeks ago), I decided to replace the X-50 with an X-200, giving slightly more gain, and also replace the UR67 with some Ultraflex10 – again providing slightly less loss.

The difference has been tremendous! So much better than I had estimated with the 2dB gain I’d calculated.

So, I looked at the X-50,  to see if I could see any reason why it had been under-performing and I noticed that the aforementioned adaptor was at fault.  Whilst it looked clean and to be in good nick, the petals on the SO239 part must have shrunk slightly, as when I undid the PL259 connector from it, the weight of just one metre of RU67 cable was enough for the plug to slip out of the adaptor. It looked perfect, but was really loose fitting.  I have tried other PL259 plugs and they all fall out, just the same.

So, I’m guessing the adaptor was the cause of this underperformance, all along.

The new aerial doesn’t have an adaptor, as I fitted an N-Type directly to the cable: yes, it’s a bit fiddly, but really not that difficult, it turns out.

And now I know how to do them, I’ll be fitting them on all my VHF/UHF cables.

And I’ll definitely not be using any adaptors again!

© 2025 Station G6WRB

Theme by Anders NorénUp ↑

By law, I need to tell you that this sites collects cookies, containing info about your IP address and shit like that.
Don't worry, I don't do anything with that information... I have far more interesting things to do.
Oh, if you must... I accept.