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Re: Si5351 voltage output #arduino

 

Thanks Mr Even Hand !!
Re: Si5351 voltage output #arduino

 

Hi,

I wonder what you are using to measure the output.

73,

Bill KU8H

On 4/6/20 12:07 PM, elkhemysy2014@... wrote:
Hello,
This is my first time that i'm asking for a help,
When i generate a sweep signal (40MHz-70MHz) with si5351A, the voltage output decrease from 3v ppk to 0v5 ppk.
please? how can i resolve this problem ??
--
bark less - wag more
Re: Si5351 voltage output #arduino

 

You might want to try this group, as it is more into sweeping frequencies with the Si5351.??
/g/Antuino/messages

The equipment there is the HFSignals Antuino designed by Ashhar Fahran ( a really cool device that I do recommend).??HFSignals Web Page:


73
Evan
AC9TU
Si5351 voltage output #arduino

 

Hello,
This is my first time that i'm asking for a help,
When i generate a sweep signal (40MHz-70MHz) with si5351A, the voltage output decrease from 3v ppk to 0v5 ppk.
please? how can i resolve this problem ????
Re: Ubitx V5 Very low audio noted #ubitx-help

 

First off I would suggest updating to the KD8CEC version 1.2.? That is the current release for the v5 uBiTx.? Be sure to get the v5 software, as the v3 or v4 have incorrect IF (clock#1) frequencies and would not put the signal in the center of the 11.059 MHz SSB filter.? This could be your problem now, as there are different version 1.122 for the v4 and v5 boards.

The process of the v5 calibration is similar to version 4 with the KD8CEC firmware (you do not need to worry about transmitting for the frequency calibration as in the stock v5 firmware).? Here is a link to a message that describes the version 4 process.? The main difference is the BFO frequency should be around 11.055600 MHz.

/g/BITX20/message/77542

Hope this helps
73
Evan
AC9TU
Ubitx V5 Very low audio noted #ubitx-help

 

Yesterday I assembled ubitx version 5 kit in a cabinet (purchased during LARC19 ) after a longer wait in my shelf.... everything is ok...But the issue is very low audio... The firmware is V1.122 for nextion display. Help me to resolve the issue.
uBitx v5 no reception

[email protected]
 

No reception of uBITX v5. The frequency is tuned, the volume changes when the control is rotated, when the antenna is connected, the noise does not change, reception - no! Tell me where to look for the problem?
Re: #firmware #i2c #smeter #ubitx #calibration #calibration #firmware #i2c #smeter #ubitx

 

Is there a way to calibrate it without test equipment, other then a dvom. Like tuning to a stron station while hooked up on the bitx manager and setting the max, and then tuning to a blank station and setting the min??

My s meter is doing s meter things, but i’m not sure if its accurate. It doesn’t go lower then s3 unless i’m changing frq’s.?
Re: uBITX v6 is now DEAD !!!!! #v6

 

I remember seen a video on yt that showed a problem with the screen going to full brightness or full dim, idk. It showed how to fix that. Of course i can’t find it now. I’ll post if i find it.?
Re: Having trouble locating files for Ver128.1 #bitx40help

 

Thank you!
Re: Small amp

 

Lol

On Mon, Apr 6, 2020 at 4:09 AM Bill Cromwell <wrcromwell@...> wrote:
Hi Chris,

After the first few replies I figured out that it was mis-stated in your
original post. When I looked outside I noticed that the sky had not
fallen and piece of it did not hit me on the head :)

73,

Bill? KU8H

On 4/6/20 12:56 AM, Christopher Miller wrote:
> I have a ubitx v3 sorry for the confusion. I’ll probably use it on one
> or two bands any way.
>
> On Sun, Apr 5, 2020 at 10:03 AM Bill Cromwell <wrcromwell@...
> <mailto:wrcromwell@...>> wrote:
>
>? ? ?Hi,
>
>? ? ?The original post says bitx and not ubitx.
>
>? ? ?73,
>
>? ? ?Bill? KU8H
>
>? ? ?On 4/5/20 11:02 AM, Mark - N7EKU wrote:
>? ? ? > Hi,
>? ? ? >
>? ? ? > The 25W amp Ashar suggested requires a 24V power supply.? Just
>? ? ?using a
>? ? ? > 24V power supply on the ubitx finals should give you at least 25W
>? ? ?out no?
>? ? ? >
>? ? ? > 73,
>? ? ? >
>? ? ? >
>? ? ? > Mark
>? ? ? >
>
>? ? ?--
>? ? ?bark less - wag more
>
>
>
>

--
bark less - wag more
Re: Small amp

 

Hi Chris,

After the first few replies I figured out that it was mis-stated in your original post. When I looked outside I noticed that the sky had not fallen and piece of it did not hit me on the head :)

73,

Bill KU8H

On 4/6/20 12:56 AM, Christopher Miller wrote:
I have a ubitx v3 sorry for the confusion. I’ll probably use it on one or two bands any way.
On Sun, Apr 5, 2020 at 10:03 AM Bill Cromwell <wrcromwell@... <mailto:wrcromwell@...>> wrote:
Hi,
The original post says bitx and not ubitx.
73,
Bill? KU8H
On 4/5/20 11:02 AM, Mark - N7EKU wrote:
> Hi,
>
> The 25W amp Ashar suggested requires a 24V power supply.? Just
using a
> 24V power supply on the ubitx finals should give you at least 25W
out no?
>
> 73,
>
>
> Mark
>
--
bark less - wag more
--
bark less - wag more
Small amp

 

I have to agree with ken, I probably will increase the voltage to the finals. I really don’t want to open the case, but he makes a good point.?

Chris?
Re: Small amp

 

Yeah, fortunately my wife understands that she probably doesn’t want to grab the dipole when Im transmitting. I’m guessing my cats won’t be able to hang on long enough to hurt them.

Lol
Re: Small amp

 

10 watts is about 60 v peak to peak 25w is about 100ppv. You won't want to hang on long.
73
Dave
Re: Small amp

 

Isn't it an option to increase (double) the voltage to the PA finals in the uBitx to increase the output power of the radio? Wouldn't that be an easier way to increase the output of the radio without building a small outboard linear?

Ken, N2VIP

On Apr 5, 2020, at 14:52, Ashhar Farhan <farhanbox@...> wrote:

allison, while the 6 db takes it only a single s unit, it does make a significant difference if you are hovering at the noise level. most of us QRPers are there. for casual operator on the other end, it means a whole difference between contact and no contact.

- f
Re: How to design crystal filter using NANOVNA #filters #nano

 

Referer:??

Ashhar Farhan <farhanbox@...> 于2020年4月6日周一 上午10:16写道：

You cannot design a crystal filter with the VNA, you can only test it to your design. To design a filter, measure the motional parameters of your crystals, probably the vna can help. Then, plug those values into one of the crystal filter design software and build it.?
Now use the vna to test it with its S21 mode

On Mon 6 Apr, 2020, 5:57 AM Curt via , <wb8yyy=[email protected]> wrote:
Ashok

first of all, you did not specify SSB bandwidth or CW bandwidth.? Asshar describes design of SSB filter at 12 MHz on his BITX and uBITX circuit descriptions.?

narrow CW filters are described on the web - they typically use 3 or 4 crystals each shunted to ground with a capacitor.? the capacitor value influences the exact bandwidth.? often one uses a frequency counter to match these crystals to 10 of 20 Hz - not as important for a SSB filter.? usually the principle is to employ crystals from the same manufacturing lot so they are similar.?

the nice VNA is much more useful to measure the resulting filter.?

there is a nice QEX article on crystal filter design available on the web.? let me know if you cannot find it.?

Curt wb8yyy
Re: Small amp

 

I have a ubitx v3 sorry for the confusion. I’ll probably use it on one or two bands any way.?

On Sun, Apr 5, 2020 at 10:03 AM Bill Cromwell <wrcromwell@...> wrote:
Hi,

The original post says bitx and not ubitx.

73,

Bill? KU8H

On 4/5/20 11:02 AM, Mark - N7EKU wrote:
> Hi,
>
> The 25W amp Ashar suggested requires a 24V power supply.? Just using a
> 24V power supply on the ubitx finals should give you at least 25W out no?
>
> 73,
>
>
> Mark
>

--
bark less - wag more
Re: Small amp

 

That reminds me of an ex gf. Her mother lived near a ham and I could copy cw from her tv. I don’t plan on causing that kind of interference. Hopefully I can get a filter and amp for 20 and be done.?

On Sun, Apr 5, 2020 at 9:36 PM STEVE via <behlmer=[email protected]> wrote:
When I first fired up my ubitx 5w 40 m, my wife came down the stairs. She correctly accused me of wiping out her internet. It was the GFI. I installed a new one- no problem. Apparently newer ones are more resistant to RF. I bought a dozen. Some for me some for the neighbors. I’ve still got nine of them.? !!

Steve Behlmer

> On Apr 5, 2020, at 10:05 PM, Christopher Miller <djmalak2k6@...> wrote:
>
> work.
Re: Small amp

 

When I first fired up my ubitx 5w 40 m, my wife came down the stairs. She correctly accused me of wiping out her internet. It was the GFI. I installed a new one- no problem. Apparently newer ones are more resistant to RF. I bought a dozen. Some for me some for the neighbors. I’ve still got nine of them. !!

Steve Behlmer

On Apr 5, 2020, at 10:05 PM, Christopher Miller <djmalak2k6@...> wrote:

work.
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