Merry Christmas Mike. You've done a great job revisiting this classic project. Furthermore, the tips and teachings contained in each video are very important to educate and encourage the new generation to venture into these types of projects. Congratulations from Brazilian preservationists.
Hello Mike, Merry Christmas. I see a lot of interesting projects coming our way. The part with the crystal filter here was very informative. I look forward to it continuing :-) 73 de Bernd
1.8423khz crystals are close to the ideal IF, (1.750) actually, and if you spread out the oscillator just a bit you can even pull in CHU on 3.33mhz. Spread the oscillator range a bit more and you can also tune in CHU on 7.85. Using a diode as a varactor with several pots to adjust the voltage and you can pad the range of the oscillator on different bands so the tuning will cover EXACTLY 500khz on 80 and 300khz on 40, and two more switches will put CHU on the high or low end. Add a cam to the preselector cap shaft so it controls a micro switch to select the diode voltage and you can switch the oscillator range by just turning that knob.
This looks amazing! BTW the smaller (newer) style crapstal CANNOT be sanded down! I had an ole' timer tell me years ago that he used to sand down his (ft-43) crystals to raise his frequency. SO..........(this was 1993 mind you, I was still a Johny Novice) Well, desoldering the outer case of my crystal, I was able to get access to the nice little disc inside. It did NOT survive 150 grit sand paper very well! 73 and Merry and Happy and all that stuff!
I just asked for my kids, when will we share the presents... ...and Michael appeared to be my Santa Claus! Merry x-mas! 73 de OH8UBJ, Juha from north Finland
Hi, 71 YO trainee electronic tech here! I watch a lot of YT videos about building and designing "stuff", and in a vid about building a power supply, the presenter, (Paul Carson I think) said about ensuring that the transformers, chokes and inductors are "out of phase" with their coils out of line to stop inductive pick up and hum. I note that the mains transformer and the choke are close together and the coils appear to be in line, will this interfere with the performance or have I got hold of the wrong end of the stick? Please help by clearing up this confusing issue for me. Thank you Jim M7BXT
Merry Christmas Mike. You've done a great job revisiting this classic project. Furthermore, the tips and teachings contained in each video are very important to educate and encourage the new generation to venture into these types of projects. Congratulations from Brazilian preservationists.
Hello Mike, Merry Christmas.
I see a lot of interesting projects coming our way.
The part with the crystal filter here was very informative.
I look forward to it continuing :-)
73 de Bernd
The explaining and testing crystal filters was the best part, of your video Mike, the whole building of this receiver is interesting. 👍📻❄☃⛄🐧
The filter section is very good! Thank you. I learned a lot. Seasons greetings!
Merry Christmas, Mike!
Nice work!
I think you've been more busy than the elves up north to get all that done!! Merry Christmas! 🎄
Looks great Mike, looking forward to hearing it work.
Great explanation about Crystal filter 😊😊😊
Waiting for the next video
Merry Christmas Mike
Thanks for the Crystal Filter instruction its subject I never thought about appreciate.
Carry on sir! Looking forward to Part 5.
Great info Mike , Merry Christmas
Merry Christmas!
Interested to see if all the careful testing and design work results in a fully operational unit at switch on. It would certainly break the mold!
Thank you, Merry Christmas. I Am from Rio Claro, Brazil.73!!!!
1.8423khz crystals are close to the ideal IF, (1.750) actually, and if you spread out the oscillator just a bit you can even pull in CHU on 3.33mhz. Spread the oscillator range a bit more and you can also tune in CHU on 7.85. Using a diode as a varactor with several pots to adjust the voltage and you can pad the range of the oscillator on different bands so the tuning will cover EXACTLY 500khz on 80 and 300khz on 40, and two more switches will put CHU on the high or low end. Add a cam to the preselector cap shaft so it controls a micro switch to select the diode voltage and you can switch the oscillator range by just turning that knob.
Regarding the "vanity" of putting the HC-49 into the FT-243 holder...
Everyone knows there ain't no Vanity Clause!
Merry Christmas!
This looks amazing! BTW the smaller (newer) style crapstal CANNOT be sanded down! I had an ole' timer tell me years ago that he used to sand down his (ft-43) crystals to raise his frequency. SO..........(this was 1993 mind you, I was still a Johny Novice) Well, desoldering the outer case of my crystal, I was able to get access to the nice little disc inside. It did NOT survive 150 grit sand paper very well! 73 and Merry and Happy and all that stuff!
You need a chassis nibbling tool... It is better than sawing/hacking and your hand gets a great workout in the process 💪 - nice job and 73s
I just asked for my kids, when will we share the presents...
...and Michael appeared to be my Santa Claus!
Merry x-mas!
73 de OH8UBJ, Juha from north Finland
Hi, 71 YO trainee electronic tech here! I watch a lot of YT videos about building and designing "stuff", and in a vid about building a power supply, the presenter, (Paul Carson I think) said about ensuring that the transformers, chokes and inductors are "out of phase" with their coils out of line to stop inductive pick up and hum. I note that the mains transformer and the choke are close together and the coils appear to be in line, will this interfere with the performance or have I got hold of the wrong end of the stick? Please help by clearing up this confusing issue for me. Thank you Jim M7BXT
I'm going low freq IF, and a one crystal filter (or two) is amazing!!
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Bravo.-- . .-.. .-.. / -.. --- -. .🎙KD9OAM