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Tuesday, 25 September 2018

Clear out of valve gear

Well this started as just a query for where might be the best place to take stuff into a "I'd like that", "do you have one of these?" series of discussions and email pretty much got mobbed.

The R1155 has found a very good home and will be off to an RAF Museum where to be honest it belongs as it is part of our/their history. I am pretty sure this one was used on a launch which fished crews out of the North Sea.

The HRO-M I still have to find a home for it, this one was also marked as an R106 and did time as a VI set and I am aware it has provenance so this is not being just sold on.

Lots and lots of 60's and 70's era valve kit looks like will have a new home soon.

The 1920's and 1930's era valves for ARRL TNT etc (all old globe type valves) as well as a set of B2spyset valves will be off soon.

The Sussex valve tester will go too that looks like it has a good home as well.
A couple of new build parasets, using old components I have to figure out what state they are in. Lots of components as well.

I'll inventory what valve kit is left soon including all the relevant books etc. There are quite a few FT243, 10XJ et al crystals that I will find a home for.

Then will go through some of the more modern rigs, projects I have not really looked at for a while and quite a bit of test kit, so in the end I will have a much reduced shack/workshop. No not giving up the hobby just rationalizing stuff as I need the space as well.


Friday, 7 September 2018

Dual Hotends on K8200


Going to see what this looks like on the old K8200 3D Printer a Chimera V6 dual head with remote bowden titans extruders will set it up for 3mm and 1.75mm. I have a feeling I might try some PVA dissolving filament as support material.  

0.2mm,0.3mm, 0.4mm and 0.5mm Nozzles for 1.75mm filament, also have some 1mm and 1.5mm for 3mm filament. Looks like the heaters can be either 12V or 24V and the thermistors are standard 100K NTC glass bead type.

I'll add a pair of silicon J6 clone socks to them as well so can differentiate between them.

The mount will almost certainly be an aluminum plate or 3D printeted backet.

Looks like RAMPS1.4 will happily accommodate the extra extruder and hot end.

The filament run out sensors will also be separate, not sure can have on both but will investigate.



Wednesday, 5 September 2018

Fitted some longer arm microswitches to the Y axis of the PCB CNC

Set a job running, it was all running fine but found the CNC had happily reset it's origin after 1st PCB was milled (8 pcb on the same bit of PCB/FR4), As the shorter armed microswitch had not triggered when it was supposed to. The sacrificial table cover had been milled instead for the next 7. Oops.

So swapped out the Y axis micro switches for some longer arm ones instead.

Think I might look at 3D printer Raspberry Pi and Octoprint / Octolapse type functionality with a small camera so can catch issues. I think there is a Prontoneer Raspberry Pi CNC shield that is basically the same as the Arduino one but you aslo get the Raspberry Pi control.

Tuesday, 28 August 2018

tinkercad to make mi0iou wobbulator enclosure

Not found one (must be one out there somewhere) but going to use tinkercad to design and enclosure for my old raspberry pi A based version.

See https://github.com/mi0iou/RPi_Wobbulator for details of the project










The boards approximately:

Will now create an box enclosure and then copy the boards onto it, but as a 'hole' so you get all the openings in the correct place.

Have gauge with me today so will measure those SMA connectors and the pots a bit better.

Saturday, 25 August 2018

shack needs sorted out as had to move stuff to operate as had issue finding space!

Far too much stuff in there so in between qso for GQRP summer sizzler looking at what is in the shack and cleaning up a bit.

Over a years worth of older IT and Radio magazines can go, plus all the older QSL cards, as scanning them now. http://m1kta-qrp.blogspot.com/2016/12/new-qsl-scanner.html

Not sure about the piles of buro and clublog card requests where I said electronic only. Might just grab random card, stick on a label and send it back.

Thursday, 23 August 2018

LF TX

As coming into the winter months again and LF is dominating for a while going to improve the LF options a bit.

I had  used an IRF510 based PA based on http://www.gw3uep.ukfsn.org/25W_QTX/472_25W_QTX/472_kHz_25W_PA.htm with one of G3YXM/G0MRF's  transmitters. I had played with transverters using  10MHz/30m and not the more usual 10m/30MHz. Antenna was an inverted L.

The bench certainly had a Graham VK3XDK 472KHz transverter for KX3  completed but not in an enclosure so I will have to pull it all together again and finish it off.

I note previously I had used 22mm or 25mm, http://m1kta-qrp.blogspot.com/2013/02/472khz-25w-pa.html cannot remember which, white PVC conduits as the LPF coil foms. I see there are some nice 3D printed LPF coil forms for 472KHz available so will try to source the STL files and take a look.


Buddipole guy rig

Used my buddipole all over the place and one thing that is a major pain is if it is windy or is tugged over (later happens far too often) it can be a pain. I ofgten just attach the carry bag to the bottom of the tripole and fill it with sand/stones.

Anyway whilst looking for something else I found this:
https://www.thingiverse.com/thing:2911912 and thought THAT is exactly what I need.

He used BB gun pellets to allow the rotation which are 6mm diameter, pretty sure I have some steel ball bearings with the same diameter and as I cycle I have lots of lithium grease.



And it is of course in the correct colour for qrp.

My own print photos etc will go here:

The 6mm metal ball bearings have cleaned up nicely.
Now to look at that lithium grease.