Category Archives: Electronics - Page 25

Buy PCBs

Posted by sm2wmv on March 12, 2012 Comments Off

I’ve built a lot of different antenna switches and spent time and money to develop PCBs for these. Since the interest seem to be quite high I decided to sell boards and use the small profit to finance parts of the SJ2W project which usually also includes more electronic projects.

All boards have 140 um copper thickness and they easily handle OM3500 type of power levels.

I am working on getting all details on the website. Info right now added for 6×1, 6×2 and stacker.

6×1	Regular six port antenna switch	40 euro
6×2	Six antennas can be routed to two radios	50 euro
Stacker	Three antenna stackbox	40 euro
4-SQ	4-SQ board	45 euro
VHP 6×2	Six antennas can be routed to two radios, 7/16″ connectors	80 euro
VHP Stacker	Three antenna stackbox to two radios, 7/16″ connectors	70 euro

To order, just drop me an email with the board(s) you wish to have and I can give you details regarding payment options plus also the shipping cost. And please note that I only sell boards, no other parts are sold.

mike@sm3wmv.com

Amplifier control box front

Posted by sm2wmv on March 8, 2012 Comments Off

I did mill the front panel for the control amplifier electronics as well today. It was a pretty quick task and the front has got room for 13 pcs of 9-pole D-SUB connectors which will be used for various electronics and 3-4 of them has got no intended function but just added as extra in case of future modifications. I also added 2 BNC for the openASC bus, 2 BNC for the power meter and a BNC for the PTT input.

Now I need to buy some D-SUB connectors and start making cables to the controller card. I will begin with making the control box I built previously to be hooked up to the device and also add the power supplies that will be needed (24v, 12v, 5v).

The whole idea of making it all in a 19″ rack casing is to make it easy to just unplug everything from the amplifier and take it with me up here if I need to do some work on it. Instead of needing to take the electronics out of the amp and have no easy way of testing it on the bench.

[Show as slideshow]

Input filter progress

Posted by sm2wmv on March 7, 2012 Comments Off

I’ve gotten some progress made on the input filter for the amp project. I’ve got some problems with the neutralization causing some problems on 21 MHz but hopefully I can solve that. I am not 100% sure it will even be needing the neutralization, and without it I have no problems at all to get a proper input SWR on all bands. I’ve simulated the tube input capacitance with a couple of silver mica capacitors.

[Show as slideshow]

New power meter

Posted by sm2wmv on February 24, 2012 Comments Off

I have been working on a few things lately. First I have fixed a box for the input filter for the amplifier project. I have also removed some old electronics from a radio module and taken the 19″ rack box, which is planned to contain all the control electronics for the amplifier automation project.

I also did change the design a bit of the current openASC power meter pickup modules. They now have an 16-bit A/D instead of the built in 10-bit A/D, which will improve the resolution a lot. I also added a new frequency counter which will make it possible to detect the frequency a lot more accurate than before. I assembled the boards and will do some programming on them this weekend.

If this work well SG3P (SK3W) will come up and build a bunch of these devices for his station as well.