I'm learning a lot from this series of RX loop amplifier experiments. I need to make a transmitting loop as well as a receiving one. Looking forward to seeing how this is done, thanks.
@benthere8051
2 жыл бұрын
I have used that prototyping technique for 30 years and have found it to be better than any two-sided PCB. Grounds are everywhere and are very low impedance. Any crosstalk can be excluded with a "box" made of double-sided PCB material. Powering the amplifier over the signal line is trick, at the cost of an inductor and a capacitor here and there. I like your additions to the basic amplifier. The addition of the 7808 adds a lot to the stability of the amplifier and the added networks to extend the high and low-frequency response shows good intuition on your part. I like it.
@clytle374
2 жыл бұрын
Thanks for your time to share this knowledge. Interesting stuff.
@MIKROWAVE1
2 жыл бұрын
Thanks for watching Cory. There are others out there who have a lot more knowlege than I. Some subjects deserve more work.
@clytle374
2 жыл бұрын
@@MIKROWAVE1 there's always someone that know more about one thing, or everything. But I always learn something with your videos.
@johnwest7993
11 ай бұрын
I've learned over the years that a modest oval speaker like yours provides the best audio for voice and CW unless one wants to use decent headphones.
@bobbartola9496
2 жыл бұрын
Great informative video! Just as an FYI, I built a 4-foot (24 T #14) square "tuned" loop for reception of SAQ 17.2 KHz. in Grimeton Sweden. I designed a common base 2N3906 (PNP) amp with approx. 12dB. gain. One end of the loop goes to a series tuning cap to ground, while the other end feeds the emitter trough a blocking cap. I did not want to shunt feed across the loop and de-Q the loop. The series feed is more like an antenna current feed. It worked great and I was able to receive SAQ 17.2 KHz. 2 years ago. Thanks for all your educational videos! Bob, N3SWL
@MIKROWAVE1
2 жыл бұрын
That is some low frequency stuff Bob!
@Steve-GM0HUU
2 жыл бұрын
👍Very interesting, much appreciated Mike. Looking forward to next installment.
@Mold0vanin
2 жыл бұрын
Хорошо представлен материал, все просто и интуитивно понятно. Спасибо.
@microflite
8 ай бұрын
Great project! The 1uF electrolytic capacitor likely has too much inductance to work well for the higher HF bands.
@thomasreed325
2 жыл бұрын
Great series great information. Thanks again I'm working on your super regen two tuber now will follow it with the three tuber next.
@tchristell
2 жыл бұрын
Really enjoying this series and looking forward to the next build and comparison. Do you have a link to the project box you used? Thanks and 73, Todd AD0RR
@wa4aos
2 жыл бұрын
I always enjoy your videos and excellent empirical work. Just a note, that chair in the background looks like it might be where a number of afternoon snoozes occurred... Hi Hi 73, Glenn WA4AOS
@chris_vk3cae
2 жыл бұрын
Hi Mike, love your work. Wondering about that 3 dB pad you added to the output of your preamp though. With 12 Volts across 195 ohms (looked like 15 + 180 to ground) the current should have gone up somewhat! You originally mentioned around 50 mA current draw without the attenuator, so did I miss something? Was thinking the 180 ohm resistor in that pad might get a bit warm. Regards Chris
@_wave64_
2 жыл бұрын
The 3dB pad and the previous 75ohm match are both directly connected between the 12V DC and ground, without a decoupling capacitor. I'm wondering if a decoupling cap would bring the 41mA current draw down quite a bit. Interesting insights on the relationship between core materials and usable frequencies.
@DAVIDGREGORYKERR
Жыл бұрын
What about 2x Nuvistors in Push Pull and have one cable to supply a B+ OF 50V and a H+ of 3V
@DAVIDGREGORYKERR
Жыл бұрын
What about the 5W Class A amplifier that can be found by googling 5W Class A amplifier and reducing the VCC to 9V so as not to burn out the receiver front end.
@usuthu65
2 жыл бұрын
Mix 75 seems ideal for MF frequency loops. If you wanted to optimize for the middle and high SW bands instead, Maybe a 31 mix would do better?
@ronlanway6667
2 жыл бұрын
👍
@drstrangelove09
2 жыл бұрын
do you have a video that show the details and build of that Manhattan board ?
@samba3403
2 жыл бұрын
VK3IV Australia what receiver are you using for this demonstration ?
@DAVIDGREGORYKERR
2 жыл бұрын
Satellite coax is double screened so might be better.
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