Homebrew SDR SSB Rig - Part 3 Dual DC Receiver Front End

Video looking at the front end of the homebrew SDR rig. The setup is dual NE612 mixers acting as quadrature direct conversion receivers. The NE612 mixers have quadrature oscillator inputs in order to generate in-phase and quadrature audio outputs. This audio will eventually feed into the Teensy to a software based phasing detector to cancel the unwanted sideband. Future experiments will look at direct conversion to DC as direct conversion to a 10kHz IF. Both will be fed directly into the Teensy.

Apologies for rambling a bit in the video, but that's how I roll I guess! I really hope there is some useful information in there.

[docfoot]

You certainly been busy Charlie very nice work and RX sounding good, We are a wee bit behind in our radio shack hi hi but still in the making with ur project, Well done, 73's

[benjaminmorgan]

Loving this series on the SDR build. I will be starting mine soon and will be using this as the direction for my initial build. Any added in-depth regarding ADC, demod, filtering, etc. would be greatly appreciated (if time allows) as I intend on attempting it from scratch on two other pieces of hardware (MSP432 and a Xilinx Artix-7). Keep up the fantastic work and I look forward to sharing progress.

[danedewaard]

Nice work! Very interesting series and many thanks for explaining your circuit so well!!!

[NeedleBender]

Great video. I did have a question since this particular design interests me a lot. There are 2 outputs from the 74hc74, does each 612 only get one of those outputs? Or do both of the require a quadrature input. Also the circuit has 2 identical sides to it. Will the receiver work with only 1 612 running? Thanks KE8SPI

[adrian_spdef]

Very nice job! Thanks for sharing! But I am courious how You receive ssb without bfo? What is that trick? Or if there is an bfo I am sorry that I do not understand what You present in that video.

[Frisky]

Hi Charlie do you have a website or a pdf that I can build this circuit. to add other band I would need preselectors for that band, could I use relays instead of those blue switches. I have learn a lot just watching a few videos. BTW you sure arrange your videos with playlist which help us watch them in order and not confuse projects your working on. I have to hand it to you! 73's KC9DFK!

[vladimirm]

Charlie напишите количество /turns на самом трансформаторе первичная и вторичная обмотки. IF Amp end Rf amp

[ytwatch]

Off topic, but where did you get the LCD clock?

[kcnicely]

What wire do you use and how do you terminate your RF connections?

[christinamarks]

Hi Charlie,

I have a question regarding the RF splitter...

You describe the splitter as having a single, 8 turn, primary with a bifiler secondary, also 8 turns. Is there any reason this could not, or should not, be a trifiler winding?

Thanks & 73, Robin