Friday, 13 July 2018
The antennas will be approximately where I marked on those images.
This time with a few extra challenges.
Rig will be ATS-3B (Designed by KD1JV)
Antennas will be from QRPGUYS for 80m I'll use the 80/60m Vertical Antenna and for 40/20/15 & 10m I'll used the 40m-10m UnUn Plus
I will also take the QRPLABS Hans Summers, G0UPL designed QCX https://qrp-labs.com/qcx.html on 30m and a SOTA Beams WSPRLite https://www.sotabeams.co.uk/wsprlite-antenna-tester/ (also on 30m) and will be qrv before the contest as M1KTA and the WSPRlite will be on during the contest.
I found the tiny new Mini USB Keyer from K1EL a must have for contesting with Win-Test as used so well as C6AKT earlier this year in BERU/RSGB Commonwealth Contest (won the Lilliput trophey for winning the QRP category) http://k1el.tripod.com/WKmini.html in UK you'll find KANGAUK have it available. https://www.kanga-products.co.uk/k1elsystemproducts-winkeyer
Got a nice shack too, I had operated from an old shed on exact same location in 2016.
Wednesday, 27 June 2018
Tuesday, 19 June 2018
That's more like it...
Adjudication report for M1K : NFD 02/06/18
No Errors found in your log
No Reverse Errors found QSO Error rate = 0.0%
Average Error Rate for this contest = 1.94%
Ended up near the bottom though as operated fixed as moved from /P location while setting up :-(
Got the base (old kitchen unit shelf) and the frame fixed in place, got the sides one and the top will make it 1/3 close 2/3rds on a piano hinge. It doesn't have lots of room inside but doesn't really need to. I have this sound foam I will add to the sides. But I really just wanted to reduce the noise and contain the dust.
I'll add a perspex door to the front, I have a sheet (Ex.G3ZAY tnx), but it is a bit thin to self support so might make a wooden frame for it. I suspect a couple of carry handles to the base. The CNC will have a couple of rubber plates added so it is less prone to cause vibration.
Got the emergency stop switch (ebay for pennies), I will put that inline with the power cord (probably in a little box on the base) activating it will kill all power immediately, will add lights and a fan, maybe a camera too! Door interlock?
A 12V car vaccum will probably sit on top (rear) or side with the flexible hose going inside to the table for the swarf etc it will create. I might 3D print a hose holder and nozzle. The PCB is bare right now,, no cover, I might leave it like that but might be prudent to cover it too.
ALL the sides can be taken off as are held in place with four 6x3.4" screws as can the frame, so if need to get to stuff I can.
In two minds if I paint it at all.
The CNC doesn't have any limit switches but it could and the PCB does support them so will be looking at if need those. I have checked and if the CNC goes off the end of one direction X,Y or Z the motors turn but don't jam, not sure if that is a good thing or not.
I expect I could RAMPS/Arduino CNC shield convert this at some point in the future but for now it will be USB cable driven. GRBL control so either something bespoke or I like Chillipepr.
I suspect one item I'll need to add will be a jig for double sided milling.
Saturday, 16 June 2018
Got plenty of plywood for the sides, base will be a bit thicker.
Working out adding a small LED strip, vaccum hose and emergency on/off switch. Front will eventually have a door.
Not the quietest of machines when milling pcb.
The spindle is c80W so that looks like the weak point, got a few ideas for alternatives. Might not be controllable off the PCB though.
Yes will be milling PCB with it. Max size about 250mm x 180mm
Sunday, 20 May 2018
Tuesday, 15 May 2018
Tuesday, 8 May 2018
Just played with few old DVD had been given.
Once stripped the guts to the centre frame and stepper drive connected up to Arduino CNC shield.
DONT do what I did and pull off the connection on one of the stepper motors.
Donor DVD, old Woodpecker 3.0.2 board (faulty).
The sharp eyed in the last image might see an HP ESP120 and some bits for a W6PQL SSPA and some R3KO bits I am building for another.
Friday, 4 May 2018
Couple of videos..
Tuesday, 1 May 2018
I have deliberately used larger wire than you might normally and used two different colours to make it clearer.
The torroid, doesn't matter what type it is the principals are the same.
I didn't show the stage but sometimes the torroid has small sharp edges. If you are using wire that is effected (you will find out if you are) then the easiest option is to use a circular needle file and make sure the hole edges are rounded (just slightly you do not want to file away the torroid!)
That's it. In this case a 2T:2T transformer, if you need a different number of turns wind a different number of times.
There are lots of other possible winding options the other frequently seen option is for a bi-filar or tri-filar winding. Simply take the wires and wind two or three of them together FIRST and then wind them through the torroid.
I note a lot of chinese ebay projects seem to use power feed line chokes often using a single winding with these binocular cores.
VSWR bridges sometimes use winding's about the outside of the torroid. You will find examples of these on this blog too.
You might see the winding's also using hardline, coax braid or even solid brass tubes and PCB ends soldered on but the photos above are for the wire version the X-Phase QRM eliminator uses. It has 2t:8t so two tuns on one side and 8 turns on the other. Here is a photo of mine as I fitted it.