Yes.

The community is also working it.

In my dreams someone will offer a kit of parts, that has been verified on maybe a couple dozen rigs.

Meanwhile,? available data may give you clues on what bands are reasonable to use.

The fact that it is V4 would suggest that improvements do occur.
There many great and wonderful minds on here working to improve the uBITX.
For that I am thankful.
Merry Christmas and a Happy New Year to you all.

Richard.

Mark, thank you!!!!!

This is weirdly white knuckle if you are a newbie...but i will wear down the problem.?

Thank you the assistance...

Don
km4udx

Hi Farhan, thanks for reply, obviously it is an honor for me to have your attention, thank you.

ofcourse it is possible to port it to other platforms,?

some months ago I worked on small audio processor based on Cortex M3 CPU stm32f103 it is?

extremely cheap module (less than 2 dollars), and I done first tests with filtering and simple noise reduction,

but it has not an efficient FPU and don't have a DSP hardware internal unit.?

Now using the Cortex M4, exactly the stm32f407 simple board ( the "china" price is less than 12 dollars shipped ),

I can test a more performed codes using standard opesource framework CMSIS to built a serious Noise Reduction.

I chose this hardware platform because it is very widespread and not tied to a particular vendor,?

because they are all arm cortex, so I can bring the same algorithm on Cortex M4 STM, but also Texas and so on.?

This allows to absolutely reduce the costs obtaining quality of industrial grade.

Currently I use the card stm32f407 (cost 12 dollars) a 320x200 display (cost 3 dollars) an encoder?

(cost $ 1.5) and a small circuit with 3 resistors and a capacitor (2 dollars). So a total cost less than 20 dollars.

These small cards are made to work very well with audio, implementing a Fir filter with the CMSIS platform is very simple and efficient.

The project will continue with the addition of a variable-width filter suitable for CW, SSB, digital modes and AM broadicast, hoping that the processor holds up the load.

Now I'm working to adjust the code readability then I'will share it as far as possible? on github as opensource like other projects.

I hope it can be useful. vy 73 de Giuseppe IK8YFW

Installation info on web. It shows exactly where to cut the trace to install the version with 2 mosfets. The detector attaches to the high side of the volume control. The mosfets patch into the RF signal at the front of the signal chain.

Type into search engine nd6t agc ubitx, it will take you to nd6t website.

Curt

Thanks Mike...? Found 1621s on ebay for <$6 and total of $5 for shipping.? Ordered 3.? Might take a long time for delivery.? I didn't spring for the $30-$35 shipping for three 8-pin dips!
Woody

开云体育

Just a quick question, is it just for smoothing? Could I get by with just bridging the connection?

Sent from my Huawei Mobile

Ebay offers shipping of $2 or $3 from China.
Mike
K5ESS

Have used 8307s in several projects. It is a log amp with rather high freq capability which can be tamed, but it does not offer the attack / decay features of the SL621.?? Still, a possibiliity.
Woody

Does anyone know if the designer of the ubitx ver 4 is attempting to solve any of the problems associated with his radio?

Began to order and discovered that they want $35 shipping from Hong Kong.? Trying to decide if I want one that bad.?? ...But thanks.
Woody

Thanks for the lead....? Although not too cheap, sure not $250!? Will check it out.? Found a datasheet ( ). It is a pretty bad scan, but maybe enough.
Woody - KZ4AK

Why not take a look at the AD8307.? Seems to be comparable to the SL621.? Different package though.

Regards,

Bruce

Hi Ian, I'm Giuseppe, I worked on the small project in stm32f103 based DSP last year, now I'm working on new project based on Cortex M4 processor cheap but performing, and the goal Will be ti creare a monitor with audio controlls like NR variabile filters and other stuff to help and enfatize the audio in rtx home made. Now I'm working on Noise Reduction module and have some results. The DSP tests continue, the Digital Noise Reduction DNR module is ready, in tests the audio signal is taken from a yaesu ft817 sampled at 44kHz and digitally filtered at 12kHz before being processed by the DNR module with Spectral Subtraction technique widely used in modern RTX.?
Next step are the filtering and better user interface ( i use the ic781 theme, simple and fast). When completed I will share It on GitHub.

Best 73 de ik8yfw.

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It took all day but I made my case out of a dry marker
board I got at Lowe's.Used the Harbor Freight multipurpose
vibrating tool to cut the pieces. For the mounting base,
I used a 6X8 wooden photo base I got at Walmart. It all
cost less than $10 but used screws from a Harbor Freight
sheet metal screw kit I already had. Looks OK.

Front panel was once part of a toaster. Used a nibbler to
make the cuts. Took some time but with my tool and die
experience in 1968, it turned out OK Ha

Now experiencing the lack of AGC listening to a group on
160M. Since I'm using a computer speaker in the 'phone
jack, wonder if I put a couple of back-to-back diodes across
the audio line with a 20 Ohm resistor in series to avoid it
looking like a short on the audio line. the level is so low it
might work. (I think) May try it...

Bob — KK5R

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