Mounting plug and securing nut for the feed.

 Mounting plug for feedhorn. The idea is to have multiple of these, so the dish can be used with different feeds for the different bands.  The thread was a joy to cut ... 60mm by 2.5mm pitch.  

A lump of 80mm dia brass bar was bought and a nut made on the lathe, nicely knurled and finally given a bit more "finger grip" in the mill. It's all coming together now.












Comments

Post a Comment

Popular posts from this blog

DIY Plated Through Holes

Here's a method I have used to produce high quality plated through hole PCB's in Rogers RO4003C material, although it should work on any double sided board. Unlike some of the commercial and other methods, this requires just 1 tank of fluid and the materials can be bought for around £20. First, why? A little introductory background. I packed away my home circuit board etching equipment (or more likely threw it away!) many years ago. For the last decade or more, the easiest and cheapest way of getting good quality double sided (or even multi-layer) printed circuit boards in FR4 has been to simply produce the Gerber files on your favourite PCB design package and send them off to China.  You can get 5 boards made for less than £5, making them yourself is simply not worth it. I know, I know, giving money to China etc. The trouble is, FR4 is not really great for microwave. It has a high dielectric constant which can be quite variable depending on what particular board the supplier h...
Read more

KST2YOU - An alternative interface to KST

Image
  If any of you use KST and want to try a slightly (hopefully) more friendly user interface, I have published one here: https://kst2you.bss.design/   Amongst the design requirements were that it should run from a phone or tablet, as I really can't be doing with dragging a laptop around for portable trips for microwave stuff. It all runs in a web browser, and obviously on any desktop with a web browser.   If you already have an account on KST, you can just log straight in, you usual username and password will work.   The message interface is familiar to you if you have used KST, however I've tried to fix a few of the oddities of the traditional KST interface. One of the problems in a busy contest day is if you are trying to organize contacts say in the north of England and have range of at most 300km, you probably don't need to see messages from stations chatting in Italy.  The "filter by distance" option allows you to ignore chat from stations beyond a cer...
Read more

23cm Antenna progress

Image
 Some 3 years (god, is it that long?  it seems it is!) I started building some antennae for 23cm based on the "usual" DL6WU formulas, JVL calculations etc. Results were not good, the antennas would not resonate where they should, the pattern was sub optimal.   Some of the early failures, with success at the front.   Numerous attempts to fix them failed.  The problem was "boom correction" .. I was using 4mm rods in either 15mm or 5/8" (15.875mm) booms, with insulators. Various rules of thumb exist on how much extra length to add to compensate for what is "hidden" by the boom cross section. I specifically did NOT want to use elements directly embedded in the boom with an electrical connection to the boom itself, as while they may work initially, as corrosion between the elements and the boom sets in, performance is variable at best.    The realisation that "just adding 75% of the boom diameter" was not going to work came through building a pro...
Read more