SINUS B1 PROJECT

[sinus trouble]

Cheers Albert!

Its a great little circuit, Not at all perfect but it does the job!

Its a shame that DAB took the B3 spot! I would have gone for that as a link.

The antenna for B1 are certainly not ideal being nearly 2.5 metres long? The B1 spectrum is literally dead around my area these days so it gives my low power TX a near interference free space.

But yeh its a work in progress.

[sinus trouble]

Some rough measurements of the receiver at work!

Below is the local oscillator tuned to 44.3Mhz (Ish) which gives me an approximate 55Mhz receive frequency.

B1 Local.PNG

[sinus trouble]

Here is the 10.7Mhz Intermediate frequency which emerges from the Ceramic Filter.

The test was performed with both TX and RX terminated with a 47 ohm resistor, No antenna!

The amplitude varies with proximity, The 10.7 on pin 8 (IF OUT) is much smoother and lightly compressed.

B1 IF.PNG

[radium98]

good work my freind sinus keep it up ,it is a good to add that squelch circuit and a little lm386 amplifier audio
thanks

[Albert H]

It's also good to add a broadly tuned input stage (or an aperiodic, broadband one). You can then accurately match your receive aerial and feedline to the input of the filter.

A further refinement is AFC, which is good for correcting drift in the LO (and in the link rig too!).

[radium98]

Sinus any testing video ? to get inspired .Thanks

[sinus trouble]

It's also good to add a broadly tuned input stage (or an aperiodic, broadband one). You can then accurately match your receive aerial and feedline to the input of the filter.

A further refinement is AFC, which is good for correcting drift in the LO (and in the link rig too!).

Cheers Albert

Im not sure what you mean by a broadly tuned input? Receivers are quite new to me but im still working on it!

Any guidance is always welcome!

[sinus trouble]

Sinus any testing video ? to get inspired .Thanks

Hello Radium

Thank You for the squelch circuit you sent, A very interesting concept.

Strange i know, But i do have love of the 'White noise' I guess im getting old.

I do have a youtube channel but i do not post any of my projects in fear of attracting the wrong attention?

But never say never? I may just do that soon?

PS I hope you and your family are well? My thoughts go out to all those affected by recent events!

[radium98]

my humble thanks my freind .look i am getting old too haha i do also love that whithe noise .it was only an option to thats all my freind ,thank you again .you can post it here just to get inspired on how things are going ,because i am far to make one .Thanks Sinus .

[Bton-FM]

my humble thanks my freind .look i am getting old too haha i do also love that whithe noise .it was only an option to thats all my freind ,thank you again .you can post it here just to get inspired on how things are going ,because i am far to make one .Thanks Sinus .

If you do radio where I think you do then big up - The g0vernment are nasty!

[XXL]

Hate to be cheeky but would you post the PCB drawing lol ?

[radium98]

@Bton-FM yes i am ,thank you .the blast was nearby.

[sinus trouble]

my humble thanks my freind .look i am getting old too haha i do also love that whithe noise .it was only an option to thats all my freind ,thank you again .you can post it here just to get inspired on how things are going ,because i am far to make one .Thanks Sinus .

Thanks Radium

I admire your courage to do what you do for free speech! Here in the UK, I would probably get a slap on the wrist for radio offences!

Anyways i will try to put a video together sometime? I dunno which format? but i will see what Radionecks will allow?

[sinus trouble]

Hate to be cheeky but would you post the PCB drawing lol ?

Hello XXL

The PCB for the receiver is in Gerber format? I do have some PDF versions? It is a double sided PCB but it is possible to construct manually with a bit of trial and error?

I do have a prototype that i etched a while back which worked well.

I will post a pic to show what i mean!

[sinus trouble]

20200526_163514.jpg

[sinus trouble]

The top layer was simply masked out during the etching process, then clearance around components was created using a 3mm drill bit!

The IF coil and Quadrature coil were hand wound on 'Skeleton' formers! Thankfully Enigma had the correct TOKO components to save me from this labour intense process!

[Electronically]

20200526_163514.jpg

Christ no seen a toko coil in years last time I saw one of those was in an old 20 watt and a 12 watt. But looks tidy sinus good job.

Sent from my AMN-LX9 using Tapatalk

[sinus trouble]

Cheers Electronically

They are like gold dust these days! I would defo recommend them from Enigma! The slug gives a nice smooth and tight tune! Not flapping about like a 'sausage down an alley' LOL

[Electronically]

Cheers Electronically

They are like gold dust these days! I would defo recommend them from Enigma! The slug gives a nice smooth and tight tune! Not flapping about like a 'sausage down an alley' LOL

Lol flapping about like coat hangover on 90mph winds. Egnima are allright but only limited stuff they have. I like a website that would make me go wow so much selection spoilt for choice sort of thing. Just seems I only browse that site for a minute if it was like double the stock I would be looking at more but it is what it is I suppose.

Sent from my AMN-LX9 using Tapatalk

[sinus trouble]

Totally agree!

I guess it is a question of what you are looking for?

I generally as a rule of thumb go for the supplier who can supply quality and not price! I perform many repairs on customers equipment, mainly audio based.

I need to know that the parts i fit will work first time! Every time!