Just a curious thought occurred today, why was 87Hz chosen as the frequency for these devices? I'm wondering if a lot of the 'beating' interference encountered around populated areas could be attributed to the alignment with three phase equipment running at the same frequency and stepping down...

I'm selling my remote flash kit to fund a new shed for my allotment as I haven't caved in 2 years due to hereditary dodgy-joint-aritis ?150 for the lot 3 x Yongnuo YN560III flash guns ( ?75 each on Amazon) 1 x camera mounted three group controller ( ?49 on amazon) 1 x 1200 Black Pelicase with...

Hi Folks, Is anyone in the Yeadon area with a largish car/van able to pickup a display shelf for DCRO? And then I can collect it from you letter in the week? It's an item that needs picking up today but I can't get up there today. Let me know here or on call me on zero7917 two zero 6951 Thanks

Red Ecrin Roc, Petzl Duo with Custom Duo v3 upgrade (400 lumens dual spot and flood) Perfectly serviceable, light works great. spent most of the last few years in a box as I have been slowly giving up caving. Can deliver to peak/yorkshire caving clubs over the next few weeks or pickup from...

As some of you will know the brief history of Derbyshire Cave Rescue Organisation involved small 'lockers' of kit in various corners of the Peak caving areas which inevitably led to box's of miscellaneous kit moving around and sitting on our shelfs in Buxton. Whilst our equipment team were...

If anyone is near to Cookie ATM please ask him the check his web services email as a certain CR team is in need of urgent technical help

Idily avoiding doing uni work and contemplating how much me knee hurts while caving and how much my stuff would be worth if the pain/pleasure ratio tipped a bit further and I ended up packing in So I have a red ecrin-roc with duo fitted with a custom duo omni v2?  all in working order What...

... to run a cave rescue team? Well, to run the Derbyshire Cave Rescue it takes the equivalent of 1700 pints worth each year  :-\ So this got me to thinking that if just 140 cavers pledged ?3 a month (less than a pint!) with gift-aid reclaimed we could make a huge difference supporting the...

I am looking for old scaff boards, planks etc.. to use on the allotment. Ideally they would be unwanted items I can collect over the next month from the peak, dales or anywhere in between (based in wakefield) but dont mind paying beer tokens if you have a large QTY. I'm after about 80M worth...

I'm currently having trouble with hosting on an 'old server, we dont sell packages for'. I think they want me to move over the newer servers/packages so there support appears non existant at the moment. So where would you recommend for mysql, cgi, pearl etc.. and bamdwidth between 4 and 30Gb...

So, Film makers... How do you choose to light your underground films? I have just purchased a rotolight neo for above ground stills and looking at the film SFX modes I am curious as to what you use underground, how well it translates to taking stills and anything that should work but does not...

I'm a bit stuck for a cover image for the next YSS news letter, if you would like one of tour shots in print on the front cover of a glossy get intouch! ( and be immortalised in the bca archives for eternity!) Needs to be portrait, and sufficient quality for printing at A4 300dpi. Better...

Just as I have cracked open a bottle using a 7mm maillion I get an email advertising an 'Amazing' product, ?15 for a keyring bottle opener... I wont be buying one, but curious what other bits of caving gear folk have used to good (or bad) effect to open important beverage containers?

There has been a lamp hanging in a certain peak cave for a little while, all full of water. I removed it earlier this week as I did not see any point in it sitting there full of water so I am now drying it out. If it is yours, Model, Colour, type of batteries etc... and I may return it  :)

Let's start at the beginning, two years ago I was invited to join an unusual trip in a certain welsh mine with lots of zip wires and via ferrata type stuff. "I'll have to go back with the camera and lots of flash guns" I thought after a really good trip. Now we fast forward to early August...

So there's a fancy dress party coming up and the wife want us to do movie characters... I want to go as the guy from Sanctum so if anyone has an old wetsuit the fit a 'larger' caver lurking in a cupboard that really should be in the bin (preferably with knarly holes in it!) I would be most...

Side Track Cave - a quick evening trip with the camera I glanced on face book that the usual Wednesday night Peak trip had visited Side Track Cave, a place that has been on my to-do list for a couple of years, add to that Gary turning around before getting to the end and needing a re-match my...

I have up for grabs 1x set of dmm nuts (1-10) 1x set of matolious curved nuts  (1-10) 2 x micro wires ( dmm , dmm 00) 3 x snap gate crabs with said nuts racked on them 1 x black diamond momentum climbing harness (used twice indoors - once outdoors) or a red wild country harness 1 x alpkit chalk...

Hi, I purchased a Fenix 55 as a backup light and I am so impressed I'm going  to mount it above my (modified) Duo as a two main light set-up. Ideally it needs mounting 30mm proud of the shell to clear the lip of the duo so I don't get shadow. (I'd move the duo up if there was enough cable)...

Some of you may remember us pestering you for votes in the Skipton building Societys competition a little while back Well we have only gone and won Thank you to everyone who took time to vote Much appreciated by me and everyone in the Yorkshire Subterranean society  :kiss2: