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Re: Sbitx bandpass filter

 

Raj,?
?
The amplifier I plan to use is from and old sdr kit and it has that chip.?
?
So I bave to modify the software to generate the three outputs.
?
Will keep looking for ideas how to implement.
?
Thanks,
Juan
Re: FT8 sBitx v3 v4.01 Power Output

 

Hey Kevin,
I noticed that the drive icon is set for 25. That icon is a percentage of the output. Try bringing it up to 75 or 100 percent and see if the watts increase while using FT8. This is the way I increase my power output to 25 watts on FT8. I was even able to make a contact with an Australian ham 9274 miles from my QTH with 100 percent power and an
Elecraft AX1 antenna sitting on my kitchen counter. These radios are great.
Daryl
N4NVS
Re: CAT control crashing when transmit on FT8

 

It is worth checking that it is grounded at one point, i.e. there is no ground loop. Lead the grounding of the devices separately to the grounding point. It is worth winding as much of the power cable (the positive and negative) as will fit on the ferrite ring in parallel. I have 6 turns of an FT140-43 ferrite from 2x 2.5mm2 wires, so that no RF signal goes out on the power supply wire.
--
Gyula HA3HZ
Re: WM8731 alternative?

 

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Wow! Absolutely amazing. I had no idea the stuff was going on. I need to get with the times.

Gordon kx4z



On Oct 27, 2024, at 00:11, WP3DN via groups.io <3voltios@...> wrote:

?
Gordon,?
?
That is the chip used in the adalm pluto.
?
If you want a nice project look for the langstone project.
?
Juan
Re: CAT control crashing when transmit on FT8

 

I suspect common mode RF from the antenna especially if you are using an end fed even with low SWR. Try adding a counterpoise of 10-12 ft of wire connected to the shield of the antenna connector or adding an RF choke by winding 6-8 turns of the coax in a coil.
?
=Vic=
CAT control crashing when transmit on FT8

 

Hi all,
?
My uBitx v6 cat control crash when transmit on FT8. Problem happens in 10m band, when the radio is transmitting, almost half way through 15 second tx interval, error msg pops up that "a usb device connected to computer has malfunctioned". I have wrapped the usb cable in a FT240-43 toroid, 8turns. But this also did not help. Kindly suggest an solution.
?
Regards
Ashok
Re: Sbitx bandpass filter

 

The processor has to generate the BCD depending on your dial frequency.

With 3 lines from processor you can get 7 bands or with this chip 4 lines and 9 bands.

In the older rigs of the 80s this was a standard approach. You run 3 lines all over the PCB

and decode 7 bands for input and final filters and any PLL or such.

On 27/10/2024 9:33 AM, WP3DN via groups.io wrote:
Raj,
How did you generate the bcd inputs?
Juan
Re: WM8731 alternative?

 

Gordon,?
?
That is the chip used in the adalm pluto.
?
If you want a nice project look for the langstone project.
?
Juan
Re: Sbitx bandpass filter

 

Raj,
?
How did you generate the bcd inputs?
?
Juan
Re: Sbitx bandpass filter

 

开云体育

I used a BCD to decimal chip. See attached datasheet.

Raj

On 26/10/2024 10:52 PM, WP3DN via groups.io wrote:

Hi guys!!!
?
Today Im testing a band pass filter with the ad831 if at 70mhz.
?
The band pass board that Im using covers the bands from 160m to 6m. It apparently works very well.
?
Now to figure out a way to control.?
?
Ideas are welcome!!!
?
Juan WP3DN
?

CD4028.pdf
CD4028.pdf

Re: WM8731 alternative?

 

?
So my usual reply to the concerns that this or that corporation is unfairly making a? profit from their expertise .....
?
(which reminds me of the joke about the mechanic who chastises the surgeon for his high prices, pointing out that he, too, works on complicated engines and diagnoses and fixes all kinds of problems like broken pushrods, valves that need grinding, etc -- to which the surgeon agrees with the skill of the mechanic but then simply asks,? "Can you fix the engine WHILE IT IS STILL RUNNING?" )
?
so my usual reply is just to encourage the person upset about the profit, is to say,? "Why don't you yourself go BUY [a portion of] the Company, so YOU would be receiving that profit and thus able to easily afford their product?
?
In this case, ADI was selling for only about $30 / share back in 2010.? ?If you have put $300 into buying a tiny portion of that company, right now you would be sitting on somewhere north of $2,300 -- and thus EASILY able to purchase one or more of their transceiver-on-a-chip, which on Mouser is going for $377 in quantities of single digits (due to a little inflation, likely due to a bit of money-printing (only a few Trillion) by the U.S. government) ?
?
So there are ways to deal with such corporations.? ?But just like THEY had to take a risk to produce that product, YOU have to take the risk of picking which corporation to purchase.? ?many go out of business every year.? ?There is no free lunch!? They worked hard to make that profit!
?
73,
Gordon kx4z
?
Re: WM8731 alternative?

 

开云体育

Amazing. That’s simply amazing. An entire radio on a chip with those capabilities.

Thanks for providing that!!
Gordonkx4z?



On Oct 26, 2024, at 21:14, Ashhar Farhan via groups.io <farhanbox@...> wrote:

?

Analog devices has become a bit of the dark lord of all things RF and analog. They have bought out everyone except the Si5351 and they sell them at exhorbitant prices.


On Sun, Oct 27, 2024, 6:36 AM MVS Sarma via <mvssarma=gmail.com@groups.io> wrote:
It is ok to buy wm8731seds either Ali... Or ebay. An year back I had them from mouser.?
You need not suspect every item of ali... .
?
Regards
Sarma vu3zmv
Re: WM8731 alternative?

 

Analog devices has become a bit of the dark lord of all things RF and analog. They have bought out everyone except the Si5351 and they sell them at exhorbitant prices.


On Sun, Oct 27, 2024, 6:36 AM MVS Sarma via <mvssarma=gmail.com@groups.io> wrote:
It is ok to buy wm8731seds either Ali... Or ebay. An year back I had them from mouser.?
You need not suspect every item of ali... .
?
Regards
Sarma vu3zmv
Re: WM8731 alternative?

 

It is ok to buy wm8731seds either Ali... Or ebay. An year back I had them from mouser.?
You need not suspect every item of ali... .
?
Regards
Sarma vu3zmv
Re: WM8731 alternative?

 

Juan -- GREAT FIND!!!? ?THANKS!!!
Gordon KX4Z


On Sat, Oct 26, 2024 at 7:26?PM WP3DN via <3voltios=gmail.com@groups.io> wrote:
Hi,?
?
I use this board from amazon.
?
Audio Injector Zero Sound Card for The Raspberry Pi
?
Juan WP3DN
?
Re: WM8731 alternative?

 

Hi,?
?
I use this board from amazon.
?
Audio Injector Zero Sound Card for The Raspberry Pi
?
Juan WP3DN
?
Re: Sbitx bandpass filter

 

Wired the 4 outputs and change the band limits and now have 30m to 6m bandpass working. That should be enough to finish wiring the tx and see how the output looks. Later will check the free gpio to complete the bands from 40m to 160m.
?
Juan WP3DN
?
Re: FT8 sBitx v3 v4.01 Power Output

 

Hi Kevin,
?
I noted that the frequency is 7.075 MHz. However, I believe that the correct frequency for FT8 is 7.074 MHz. Try that and see if the QSOs are answered.
?
?I do not know why the power is showing 0 Watts.? Is it the same for other bands put into a dummy load?
?
73
Evan
AC9TU
Sbitx bandpass filter

 

Hi guys!!!
?
Today Im testing a band pass filter with the ad831 if at 70mhz.
?
The band pass board that Im using covers the bands from 160m to 6m. It apparently works very well.
?
Now to figure out a way to control.?
?
Ideas are welcome!!!
?
Juan WP3DN
?
Re: WM8731 alternative?

 

I plan to use a Radxa Zero 3W which has a slighly different pin layout.
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