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.
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.
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.
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.
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.
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.
You might want to bring a small Phillips head screwdriver (for eye glasses) in order to perform probe calibration.
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
If you have a standalone signal generator, please bring it, along with BNC wire connections for the oscope.
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.
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!