Topics

V5 not receiving local am stations

Maurice Bersan
 

Mine isn't that fancy Wayne, I just did a cable swap

Wayne Leake
 

 A number of antenna tuners have the option of bypassing so the antenna is basically bypassed.
 My autotuner, as well as an older manual tuner have the option.
  
 And I am going to have to replace coax due to a fire in the shed where they pass through.

 Wayne WA2YNE



On Tue, Feb 25, 2020, 8:57 PM Maurice Bersan via Groups.Io <Vk6hly=yahoo.com@groups.io> wrote:
Solved!
Thanks to all who helped.
It turned out to be my manual antenna tuner not being able to tune in MW. I connected my antenna straight in to my ubitx and all those MW broadcast stations came to life.
Someone on this forum did mention my antenna, I should of listened earlier. 
Cheers
Maurice
Vk6hly

Maurice Bersan
 

Solved!
Thanks to all who helped.
It turned out to be my manual antenna tuner not being able to tune in MW. I connected my antenna straight in to my ubitx and all those MW broadcast stations came to life.
Someone on this forum did mention my antenna, I should of listened earlier. 
Cheers
Maurice
Vk6hly

Maurice Bersan
 


Dean, I tried your demo but no luck. Still won't tune down that far.
I will have a look around memory manager next chance I get.
Thanks
Maurice

Evan Hand
 

Dean,

Forgot about the direct frequency input on the CEC/Nextion.  Much easier than all that dial turning.  Only issue is it is not available for the stock 2 line display version of the software.

Thank-you for pointing the shortcut out!

73
Evan
AC9TU

Dean Souleles
 

Hi Maurice,

I can't help you without more information.  What specifically is not working?

The video shows that it can work and does for me, V5, CEC 1.2 firmware and Nextion display.  I believe there may be a setting in uBitx memory manager to allow tuning outside the ham bands, but I don't have time to research it this morning.

73,
Dean
KK4DAS

Maurice Bersan
 

Sorry Dean that method does not work for mine.

Dean Souleles
 

Hi gents,

V5 with CEC firmware and Nextion and you can direct tune to any frequency in the AM broadcast band. Thus:

https://photos.app.goo.gl/icraDtzkxDhQidML7

Cheers and 73,
Dean
KK4DAS

Maurice Bersan
 

Yup found that one out the hard way Evan

Maurice Bersan
 

You may have given me a clue Evan. I have tried a couple of earlier versions of the firmware. I think i may have been using the version which included an audio tone for calibration at the time. So I'm relieved to know the problem is more than likely due to firmware.
Cheers mate.

73

MVS Sarma
 

Vagter your medsage i checked again my local am station on 738khz. It is clean reception.. 
Ascalready suggested with kd8cec firmware, selectv160m and  with 1khz step tune down to wanted frequency. . I receive long distance stations too. 
Perhaps if your antenna nulls to the station, signal might be weak.

On Mon, 24 Feb 2020, 7:24 pm Daniel Flanagan, <danflan49@...> wrote:
I just put CEC V1.2 on my V5 and it tunes only to just below 3.0 MHz.



On 2/24/20, Evan Hand <elhandjr@...> wrote:
> What software are you using on the uBitx?  Stock or another version like
> KD8CEC's?
>
> The original software was for 3 to 30 MHz.  CEC expanded to include down to
> 1 MHz.  Not sure if any versions go below 1 MHz.
>
> Are you trying to tune in a 720 KHz signal?
>
> 73
> Evan
> AC9TU
>
>
>
>



Evan Hand
 

I went back and verified that if you tune down from above 3 MHz it does go below 1 MHz.  If you accept the 100 Hz tuning step, that is a LOT of turns of the dial.  I have the Nextion display on my v5 and set the tuning step to 1 KHz.  Still a lot of dial turning.

I was able to tune in to the AM stations here in the US.

One caution: the most accurate adjustment of the master crystal is at the highest reference that you can receive.  There is a multiplication effect the lower the frequency that you use to calibrate.  I would look up a SW am station frequency in your area of the world, and use that.  The alternative is a known good frequency source (signal generator) and use that.

73
Evan
AC9TU

Daniel Flanagan
 

I just put CEC V1.2 on my V5 and it tunes only to just below 3.0 MHz.

On 2/24/20, Evan Hand <elhandjr@...> wrote:
What software are you using on the uBitx?  Stock or another version like
KD8CEC's?

The original software was for 3 to 30 MHz.  CEC expanded to include down to
1 MHz.  Not sure if any versions go below 1 MHz.

Are you trying to tune in a 720 KHz signal?

73
Evan
AC9TU



Evan Hand
 

I checked the source code on Ian's, KD8CEC, github account and found that there are two different limits for frequency limits:
Lines 112-118

// limits the tuning and working range of the ubitx between 3 MHz and 30 MHz
#define LOWEST_FREQ  (3000000l)
#define HIGHEST_FREQ (30000000l)
 
//When the frequency is moved by the dial, the maximum value by KD8CEC
#define LOWEST_FREQ_DIAL  (3000l)
#define HIGHEST_FREQ_DIAL (60000000l)

Based on the descriptions only (I will need to dig in deeper to see if this is true), I would suggest you go to the 80 meter band and tune down manually from there.

The alternative is to change the #define LOWEST_FREQ  (3000000l) to a value lower than the station you want to receive.  Then recompile and download.

73
Evan
AC9TU

Maurice Bersan
 

Evan
I am using CEC v1.2. yes I am trying to tune into 720khz. It's our local ABC. 
Maurice

Evan Hand
 

What software are you using on the uBitx?  Stock or another version like KD8CEC's?

The original software was for 3 to 30 MHz.  CEC expanded to include down to 1 MHz.  Not sure if any versions go below 1 MHz.

Are you trying to tune in a 720 KHz signal?

73
Evan
AC9TU

Maurice Bersan
 

Hi Evan, I forgot to mention in my post but all other bands rx and tx work  just fine. I'm sure I tried to zero beat 720 back when I was calibrating my V5. Just not receiving MW any longer.
Maurice.

Evan Hand
 

Sorry that it has stopped working.  You have not given us enough information to point you in the correct direction to fix it.

Let's start simple:
do you hear static from the uBitx with the antenna connected, and nothing when the antenna is disconnected?

If so, then the audio sections are OK and we will need to go on to the RF and IF sections.

It would also help to know what type of test equipment that you have and what may have happened between the time it was working and now.

Let us know.

73
Evan
AC9TU

Maurice Bersan
 

Hi again, I have suddenly discovered my V5 is not receiving our local am broadcast stations eg 720 882 etc. I am fairly positive it was before. I checked with my other Kenwood hf rig and the stations are transmitting.
What could be the problem?

Cheers

Maurice
Vk6hly