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Early Arduino projects ( Fall 2014)
Because of size, I decided to use the Arduino Nano and Mini-Pro closes for most of my projects. I ordered a couple of the NOKIA 5110 LCD modules that are available from Adafruit and multiple e-bay...
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DL4YHF Frequency counter re-package (Spring 2014)
I had an old QRP transceiver that I wanted to start using. I had modified it with a multi-turn pot, which made adding a small counter one of my first projects. Looking around I found the 4 - 5...
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Dummy Load - Watt Meter
One of the first pieces of test equipment I decided to build was a QRP dummy load.The first one was just twenty 1k 1/2 watt resistors on perf-board. I added a diode RF detector and used a DVM and a...
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A couple of antenna analyzers (Fall 2014) Corrected Link
Because of a downed tree during a storm I had to put up new antennas. I had limited space so waned to go to a multi-band antenna. From previous attempts to adjust a multi-band with just a standard...
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SNA JR
I started working on the SI5351 antenna analyzer that I was playing with. I wanted to check different low-pass filters to clean up the square-wave out of the 5351, and needed a simple way to do this....
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BITX Modular The Backplane
I had been looking around for a QRP transceiver to build, and decided to do something based on the BITX . The simple design with the use of a common bi-directional amplifiers for several stages...
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The Chinese- Polish- German SNA (Scalar Network Analyzer)
I had finished the SNA-JR, because of its size and ease of use I was very happy with it for doing basic filter testing. There are some things that I want to do that would require a more capable...
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Using the Chinese SNA
First thing I had to do after I received the Chinese SNA was its internal calibration.To calibrate the system you will need an in-line attenuator, 6db. if calibrating linear or 40db. for log. Using...
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Testing the Return Loss Bridge
One of the functions available in the software for the Chinese SNA is the ability to measure SWR using a Return Loss Bridge. When I was laying out the attenuator boards I had room to include a RLB....
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BITX Modular Audio Baord
After looking at documentation for several versions of the BITX and others based on the original design, I decided to use the circuit of the BITX version 3b. First board I started with was theAudio...
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SNA Jr Software Update
When I first did the SNA Jr, I used my existing Antenna Analyzer software. After playing with the Chinese SNA, I decided to do a rewrite of the SNA Jr software to incorporate some of its features....
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SNA Jr as Grid Dip Meter
One of my projects needs a 70Mhz. Low Pass Filter. I plan on using air wound coils for its construction. Only problem is that my RLC meter does not measure down to the inductance values I need. I...
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SNA Jr Software update two
I changed the display from a 1.44" 128x128 TFT ti a 1.8" 160.x128 TFT. Unfortunately they use different driver chips so I had to make some changes to the software , mainly a different driver library...
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"Frog Sounds" meets si5351 meets SPAM can
I have been following Pete's (N6QW) LBS version 2 transceiver progress, and decided to put my BITX project on hold until he gets his finished. I might just change over to some of his design instead...
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" Canned Frog" part two
I have been working on the circuit board layout for the "Frog Sounds" transceiver, in a "SPAM" can.Everything fits on a board that just slides inside the can, and will be soldered to the transceiver...
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"Canned Frog" part three UPDATED
Now that I had the VFO and controller completed, it was time to start putting the transceiver circuit board together. This is a very nice double sided board with plated through holes, and good...
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My version of Farhan's SPECAN
A couple of months ago I started to think about building a simple Spectrum Analyzer. I thought using a simple Direct Conversion receiver might work for what most hams would need. Looking around the...
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"Canned Frog" finished
I had a bit of a delay in getting the Canned Frog finished when my feline helper decided that the little plastic bags of parts for this and some other projects would make great Kitty Toys. For several...
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My SPECAN 2nd IF Amplifier
I did a circuit board layout for the 2nd IF amplifier and quickly etched a board. Everything is surface mount on the top of the board with the bottom of the board kept solid for shielding. Since I...
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SNA jr Re-build Updated 11/9/2015
There is a upcoming 'Makers Fair' in Atlanta, and several of the local Ham Radio clubs are going to have a display there. They will demo some equipment and modes of operation. There will also be...
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