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Daniel KK4MRN
Hello gang,
I finally got back to my Two Tinned Tunas EZ Build that did not work.? Fixed it.? It is working correctly now.? Yay! Sadly, it had been sitting around in my project / junk box so it got bounced around.? Lost the original final transistor and 7.110 crystal.? I do have a 7.030 crystal that was still in the can.? I think the LED had come loose somehow.? So, I desoldered it...? Well, attempted to desolder it multiple times.? I spent time on reading various methods of how to desolder on youtube including using simply a soldering iron with a clean tip and using fresh solder for heat transfer, solder wick, a good solder sucker like my Engineer solder sucker, hot air gun, and then Chip Quik solder alloy.? ?The solder sucker worked the best - after many, many attempts.? Even though I failed.? I came back another day and tried again.? I was not doing it just for this project, I wanted to make sure I learned to desolder.? But I finally got the tiny LED lead that stuck in the hole out.? This is why I could not get the hole clear.? A very tiny broken lead in the hole.? Resoldered the LED.?? I discovered that the sockets for the final transistor and the crystal were not making a good connection.? So, I desoldered the sockets for both the cyrstal and the transistor and then solderd a new crystal and a new 2N2222A (Q2) can transistor directly.? This earlier message helped me to learn to replace Q3 for the keyer because the LED stayed on.? This solved the last problem. ?I had an extra 2N3906 PNP transistor. /g/QRpmeKits/topic/two_tined_tunas_need_some/104782826 Anyways, I tried the various suggestions that Rex suggested.? It helped.? I think there is some intermittent issues once in a blue moon probably with some connection / soldering issue.? ?Other than that I hear the transmitter on my rig when keying.? The LED only shows when I key.? The crystal is 7.030 MHz but I hear it on about 7.029.?? The area 7.030 is a terrible place to do testing because it is around a popular spot in the band.? But I had lost my 7.110 MHz crystal.? Does not matter than my main rig and TTT are only hooked up to a dummy load.? The CW signals are strong tonight... Must be those good solar cycle 25 sun spots... I recently got a new oscilloscope and it shows a signal at 7.029 like my rig shows.? However, I could not get the FFT Math function to display correctly.? ?Since my rig was showing the small signal correctly on my rig in the waterfall, I think the TTT is OK.? I think FFT Math function on my scope is not showing correctly due to interference of some kind or my misunderstanding of how to get it to work properly.? I did have FFT Math working correctly hooked up to a signal generator though.? I will try again later... My Diamond SWR/Power Meter shows almost 0.3W but I seriously doubt it is outputting 0.3W - most likely less than that.? But at least I see indication on my scope and power meter now. Thank you Rex, Russel, and others... 73 Daniel KK4MRN |
