Tag Archives: Tech Night

Our Latest “Tech Night” – A DSO138 Oscilloscope Kit Build

Our latest Tech Night became a Tech Day this past weekend. We got together on Saturday afternoon to build another kit – the DSO138 Oscilloscope. We had a great turnout with over 15 kit builders and helpers present.

Finished Scope Kit
Finished DSO138 Scope Kit in case

Brian, AB1ZO choose this really cool kit for us to build. Here are some specifications for the finished DSO138 Oscilloscope kit:

  • Analog bandwidth: 0 – 200KHz
  • Sampling rate: 1Msps max
  • Sensitivity: 10mV/Div – 5V/Div
  • Sensitivity error: < 5%
  • Vertical resolution: 12-bit
  • Timebase: 10us/Div – 50s/Div
  • Record length: 1024 points
  • Built-in 1KHz/3.3V test signal
  • Waveform frozen (HOLD) function available

The kit came with all Surface Mount parts pre-installed.

The kit included a very nice case to finish off the project. This was a pretty big project to complete in a single afternoon but quite a few of our builders completed their kits and got them working!

The gallery below contains more pictures from our kit build. Everyone was very focused on the building process as we all wanted to get our kits to work in the time we had together.

Some folks did not quite get their kits completed and are planning to finish them at home. The following are some links and videos to help.

Here are some videos which show the assembly of the kit and its enclosure and the operation of the completed scope. The first video shows the kit in operation.

 

 

 

 

I know that Brian is planning to do more kit builds throughout the year so be sure to keep an eye on our Tech Night page to see what is coming!

Fred, AB1OC

Tech “Night” – Kit Building!

Our February Tech “Night” will feature an Oscilloscope Kit build! To provide more time to build this kit, our February Tech “Night” session will be held on Saturday, February 18th from 1-4 pm at First Church in Nauss, Hall.

Our Tech Night meetings feature technical discussions and presentations on a broad range of topics. Our Tech Nights take place in a lab oriented environment where hands on elements and round table style discussion is encouraged. For information on the topic for our next Tech Night session, see our Tech Night page.

First Church Parking and Meeting Entrance

Parking Information: 
Please park in the Front Door Agency or Eaton and Berube Insurance parking lots. As you head north on Concord St., the Front Door Agency driveway is the first driveway after the church driveway. The Eaton and Berube Insurance driveway is the second driveway after the church driveway. Those that require handicap parking should use the spaces marked as such at the church parking lot. We must reserve parking directly next to the church for other church activities.

Parking at Our Meetings
Parking at Our Meetings

Feb 18 DSO138 Kit Building Tips

Hi DSO138 kit builders,

I wanted to share some tips to follow for our 18 Feb Kit Build from 1-4pm. As I already built my own kit, I wanted to share some advice.
I know not all of you can attend, but for those of you who can, please read below. I’ll also post on website along with some pics.
  1. Make sure you bring a magnifying glass AND a multimeter. Also might help to bring an LC meter too (though I didn’t have one at the time) The color bands on the resistors are particularly impossible to see, so I had to measure the resistance of every one. I even did it 2-3 times to make sure I was right.
  2. To test your kit at the end of the night, you need to supply it with power. You can do this 2 different ways. The first is bringing a 9V battery along with 9V battery leads terminating at the end of a female port as shown below. The second, is grabbing a power adapter rated for no higher than 12 V again terminating on a female port with pic show below.
  3. You might want to bring a small Phillips head screwdriver (for eye glasses) in order to perform probe calibration.
  4. If you want, bring your laptop so you can download some signal generators (using your sound card) in order to play with the oscilloscope. In order to do this, I ended up using a BNC to audio adaptor which I purchased off of Amazon Prime. I’ll bring mine in case you don’t have one
  5. If you have a standalone signal generator, please bring it, along with BNC wire connections for the oscope.
DSO138 power supply port
9V battery adaptor
12V power supply (stolen from a Linksys router) with port (top-middle)

In order to do some testing, we are going to want to use either signal generators that club members graciously bring in, or you can use your laptop’s sound card. To that end, Mike (K1WVO) suggested a really nice link to do this.

I’ve tested most of these and they work fine on my scope.

If I have any other thoughts, I will update this post.

Thanks and 73,

Brian, AB1ZO

January Tech Night Making the Most of Your HF transceiver

The January Tech night was about getting the most out  of your HF transceiver. Fred had an interesting  PowerPoint presentation where he demonstrated how to do just that. For anyone else new to HF I wanted to comment on it here. In his presentation he described how you should use filtering first  and digital signal processing (DSP) as a last resort. That’s the exact mistake I was doing. if you uses a lot  DSP with a narrow filter selected the audio sounds hollow and really difficult to listen to. If you turn off the DSP  select the narrow filter and then bring up the DSP if needed you get less noise and a pleasing audio output. Also turning down the AF gain can be your friend too!

73 and good DXing

-Jim.   K1BMR