SimpleX Super - Crystal Filter - Part 4

[@mauriciosinigaglia4761]

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.

[@MIKROWAVE1]

Thanks so much for watching. I wondered if anyone would as it hit on Christmas eve! Did you notice if it had the auto dub in Portuguese?

[@mauriciosinigaglia4761]

Greetings. The automatic audios are working well. I prefer the original. But this automatic audios good for those who don't understand the original. Note: your voice in Portuguese is weird.k

[@MIKROWAVE1]

Ha - no doubt very weird!

[@Steve-GM0HUU]

Thanks Mike. Lots of top tips. I was surprised at how effective a single XTAL is.

[@MIKROWAVE1]

What we don't see yet is the actual circuit loading or the skirts, but very impressive indeed! Hey this circuit was king for 20 years before Collins mechanical filters in the 50s and ceramics and CB filters came along.

[@Steve-GM0HUU]

@MIKROWAVE1 I will maybe try it out. I recently built a x4 XTAL 400Hz/4MHz ladder filter for a superhet and I don't think the performance was much better than this. So, maybe see if I can use this as a simpler circuit with less XTALs??

[@alainmichaud8992]

The filter section is very good! Thank you. I learned a lot. Seasons greetings!

[@MIKROWAVE1]

We actually have just 1 inch of snow for Christmas this season. That is very nice to handle compared to rain or a couple of feet of snow..

[@berndb.5097]

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

[@MIKROWAVE1]

I would like to repeat that with a Nano VNA, but I thought doing it with crude equipment might be better.

[@superhet7281]

Merry Christmas, Mike! Nice work!

[@MIKROWAVE1]

Thanks, you too! Progress slower this week!

[@valeryg5256]

Приветствую , Майкл !!! С большим удовольствием смотрю ваши ролики , очень интересно и поучительно ) Мне приятно , что в наше время еще кого-то интересует ламповые конструкции ) Ваши ролики возвращают меня в начало семидесятых годов ! Я тогда делал приемники и конверторы , кончно на лампах и по скольку купить кварц на нужную частоту ПЧ (1600кгц) с избирательностью были небольшие проблемы ))) На сегодняшний день проблем как бы и нет , но конструирование приемников ушло на второй план , хотя паяльник всегда в деле ))) С Рождеством ! de UT5XR 73!

[@JCWise-sf9ww]

The explaining and testing crystal filters was the best part, of your video Mike, the whole building of this receiver is interesting. 👍📻❄☃⛄🐧

[@MIKROWAVE1]

Well the power supply wiring is starting to take shape on the bench , but at a temporary halt over Christmas!

[@garypoland5288]

Looks great Mike, looking forward to hearing it work.

[@MIKROWAVE1]

No Guarantees! Oh Darn, I cant use that excuse on this one. So many folks have built these successfully!

[@mackfisher4487]

Thanks for the Crystal Filter instruction its subject I never thought about appreciate.

[@MIKROWAVE1]

The wiring comes next and power supply bring up. But I will circle back to the filter.

[@jerryuhte1284]

Great info Mike , Merry Christmas

[@MIKROWAVE1]

Shouldn't you be watching Hallmark Movies instead of KZbin? Merry Christmas Jerry.

[@ornithopterindia]

👍Thank you sir.

[@RadioProyectos]

Great explanation about Crystal filter 😊😊😊 Waiting for the next video Merry Christmas Mike

[@MIKROWAVE1]

One tidbit about the single crystal filter that I did not cover. They actually can ring on signals, the Q is so high, which can be annoying. But they can also dig out a CW signal buried in noise like a magic DSP for this same reason.

[@edbeckerich3737]

I'm going low freq IF, and a one crystal filter (or two) is amazing!!

[@MIKROWAVE1]

This is an old idea that works well in High Impedance and tube circuits.

[@hazevthewolf178]

Carry on sir! Looking forward to Part 5.

[@MIKROWAVE1]

Now it get exciting - high voltage!

[@edbeckerich3737]

Question about this beauty..why a BFO and a regenerative detector? How do those work together??

[@andersonnobre5163]

Thank you, Merry Christmas. I Am from Rio Claro, Brazil.73!!!!

[@MIKROWAVE1]

Hello Brazil! Merry Christmas and is the auto dub into Portuguese working on this one?

[@Swamp-Fox]

Merry Christmas!

[@MIKROWAVE1]

Merry Christmas and Happy Homodyne to all of you radio friends!

[@metatechnologist]

I think you've been more busy than the elves up north to get all that done!! Merry Christmas! 🎄

[@MIKROWAVE1]

The elves slacked off this week!

[@kellyeye7224]

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!

[@MIKROWAVE1]

Break the mold and give me a shock too. Next stop - power is applied.

[@MrBtcruiser]

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

[@MIKROWAVE1]

Oh Yes the evil nibbler! I used to nibble chassis when I was in College at my Co-Op job making test boxes! Hand still hurts!

[@michaelyancey3021]

Regarding the "vanity" of putting the HC-49 into the FT-243 holder... Everyone knows there ain't no Vanity Clause! Merry Christmas!

[@MIKROWAVE1]

Amen!

[@KennethScharf]

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.

[@MIKROWAVE1]

That common crystal frequency is a great suggestion Ken. Its funny I was thinking similarly on how to do the switching gracefully on the bandspread, but didn't get that far!

[@W1RMD]

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!

[@MIKROWAVE1]

You are thinking correctly about the sand paper. I have been using the blue superfine automotive paper with water to grind crystals for years. Maybe a video...

[@W1RMD]

@@MIKROWAVE1 Sounds great! I though you could only (reasonably) sand FT-43 crystals. I wonder how these newer ceramic style crystals compare to quartz crystals of the old days.

[@jamescstanley5018]

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

[@MIKROWAVE1]

You youngsters scare me! Ha. I have no idea about the reactor coupling argument. It sounds subtle, since it is not discussed widely in the literature. I have a few questions. What about the steel chassis vs AL? The winding types? The current and voltages to make the fields? Now i'm questioning my life choices. It's the Gluhwein Talking.

[@JuhaK71]

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

[@MIKROWAVE1]

You must get your presents faster, being so close to the North Pole!

[@JuhaK71]

@MIKROWAVE1 Santa lives in Korvatunturi, Savukoski 🙂

[@Mold0vanin]

Познавательно

[@MIKROWAVE1]

Счастливого Рождества вам и вашей семье

[@AdamosDad]

Bravo.-- . .-.. .-.. / -.. --- -. .🎙KD9OAM

[@MIKROWAVE1]

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