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Sunday, July 31, 2016. I built another little preamp today (this time just a CE followed by a CC rather than the shunt thing I used before), just to see if additional drive was the issue. Did not seem to help. I actually tried a wall wart, but I think I was either getting feedback into it or it was just noisy, was getting a weird output when I tried to bring the power above what I had with the batteries.). Tuesday, July 26, 2016. Edit 2 (next day): I tried swapping out the .001uf for .1uf couplin...I wou...

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KC9DLM's projects | kc9dlm.blogspot.com Reviews

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Sunday, July 31, 2016. I built another little preamp today (this time just a CE followed by a CC rather than the shunt thing I used before), just to see if additional drive was the issue. Did not seem to help. I actually tried a wall wart, but I think I was either getting feedback into it or it was just noisy, was getting a weird output when I tried to bring the power above what I had with the batteries.). Tuesday, July 26, 2016. Edit 2 (next day): I tried swapping out the .001uf for .1uf couplin...I wou...

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KC9DLM's projects | kc9dlm.blogspot.com Reviews

https://kc9dlm.blogspot.com

Sunday, July 31, 2016. I built another little preamp today (this time just a CE followed by a CC rather than the shunt thing I used before), just to see if additional drive was the issue. Did not seem to help. I actually tried a wall wart, but I think I was either getting feedback into it or it was just noisy, was getting a weird output when I tried to bring the power above what I had with the batteries.). Tuesday, July 26, 2016. Edit 2 (next day): I tried swapping out the .001uf for .1uf couplin...I wou...

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kc9dlm.blogspot.com

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KC9DLM's projects: April 2016

http://kc9dlm.blogspot.com/2016_04_01_archive.html

Friday, April 22, 2016. Square wave test signal generator. I recently ordered parts from various sources, but haven't received them yet. I was itching to build something, and I came across this. Little square wave test signal generator. Just a little multivibrator to make a signal. Since it is a square wave, you are going to get lots of harmonics. The idea is that if you just need to put in *a* signal to see what comes out the other side (be it AF, IF, etc), this would be a quick little tool. But I was h...

2

KC9DLM's projects: July 2016

http://kc9dlm.blogspot.com/2016_07_01_archive.html

Sunday, July 31, 2016. I built another little preamp today (this time just a CE followed by a CC rather than the shunt thing I used before), just to see if additional drive was the issue. Did not seem to help. I actually tried a wall wart, but I think I was either getting feedback into it or it was just noisy, was getting a weird output when I tried to bring the power above what I had with the batteries.). Tuesday, July 26, 2016. Edit 2 (next day): I tried swapping out the .001uf for .1uf couplin...I wou...

3

KC9DLM's projects: First steps towards a transmitter

http://kc9dlm.blogspot.com/2016/07/first-steps-towards-transmitter.html

Tuesday, July 12, 2016. First steps towards a transmitter. I would like to add a CW transmitter to my little DC receiver. I'm thinking of using an IRF510 running as a class C amplifier. I got a 74AC240 to use as a driver for an IRF510. However, the output of the DDS is fairly low. I was going to use a comparator to convert to a 5v square wave, but was having trouble getting it to work. I think the issue is that the LM399 I pulled out of the junk box isn't fast enough :/. Subscribe to: Post Comments (Atom).

4

KC9DLM's projects: antenna here is dipole

http://kc9dlm.blogspot.com/2016/07/antenna-here-is-dipole.html

Tuesday, July 5, 2016. Antenna here is dipole. I finally got a chance to build and put up an antenna. I followed on from the the ideas that WP4AOH. Had for building the center insulator, but added a 1:1 current balun as laid out in the W1FB QRP Notebook. That calls for 12 bifilar turns of #26 wire on a FT50-43 for up to 25 watts. I used #22 wire, as that is all I could find in my junk box. Here is a closeup of the center insulator. And here it is living in a tree. Subscribe to: Post Comments (Atom).

5

KC9DLM's projects: CWAZ filter

http://kc9dlm.blogspot.com/2016/06/cwaz-filter.html

Thursday, June 2, 2016. Playing with the little buffer amp, I noticed the output was pretty messy - the 2nd harmonic was really high. (Oddly, when I first built this without the output cap, it didn't look that bad. But it was also putting out 6v p-p and probably would have burned out in a minute.). I figured at some point I'd need to build a low pass filter, so this seemed like a good time. Looking around, the CWAZ lpf design seemed popular, and I found this pdf. From GQRP on how to build one.

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KC9DLM's projects

Sunday, July 31, 2016. I built another little preamp today (this time just a CE followed by a CC rather than the shunt thing I used before), just to see if additional drive was the issue. Did not seem to help. I actually tried a wall wart, but I think I was either getting feedback into it or it was just noisy, was getting a weird output when I tried to bring the power above what I had with the batteries.). Tuesday, July 26, 2016. Edit 2 (next day): I tried swapping out the .001uf for .1uf couplin...I wou...

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