Date   
Re: Bitx (40) agc and muting

Elmar Völler <dl2qa@...>
 

from junction r111/r113 solder a 1n4148 diode direct to the 12volt rail
(LM368 is now alltime connected with 12volt)
73 elmar-dl2qa
 
Gesendet: Sonntag, 01. Juli 2018 um 14:15 Uhr
Von: 4Z1NT <menashedovid@...>
An: BITX20@groups.io
Betreff: Re: [BITX20] Bitx (40) agc and muting
When you say solder 1n4148 t0 +12v not RX, which one are we talking about?

Re: Anyone seen an SSB xmit causing the menu to pop up?

MVS Sarma
 

learnt a point Farhan jee.


Regards
MVS Sarma
 

On Sun, Jul 1, 2018 at 12:06 PM, Ashhar Farhan <farhanbox@...> wrote:
check if your supply voltage is dropping on 'hellow'.

- f

On Sun, Jul 1, 2018 at 11:43 AM, Mvs Sarma <mvssarma@...> wrote:
Perhaps local radtion due to left over mismatch.
 It might be wiser to shield loose wires to/from audio amp /agc  by shielded wires and shield grounded on one side.
Also the power reaching to raduino could be passed thro a diode say 1N5401 and filtered by 100uF parallel 100nF.

All the best

Regards
MVS Sarma
 vu3zmv

On Sun, Jul 1, 2018 at 10:05 AM, brad martin <emclinux@...> wrote:
I too have seen this. I have yet to sort mine out and usually for me happens on an antenna and not the dummy load.

Brad
On Sun, Jul 1, 2018 at 12:34 AM Gwen Patton <ardrhi@...> wrote:
I was testing into a dummy load and noticed that when I whistled into the mike, or even spoke into it on higher frequencies, would cause the rig to react as if I had pressed the button on the encoder. It showed "Band Select >", and receive stopped. Pressing the encoder twice exited the menu normally. Is this RF getting into the switching transistor the encoder switch trips? How can I prevent this?

Gwen NG3P




Re: TX frequency? of uBitx at CWL and CWU mode #ubitxcw

 

Akira-san : 

The uBITX display frequency in CWU/CWL is the RX frequency not the TX frequency. The norm in CW on most commercial rigs is to always display the TX frequency.
You can however set the RX offset. It seems that yours must be 1.5 Khz which is a lot. Typically it would be something in the range of 500 to 800 Hz. 

There is a related issue which I have reported and that is that changing CW modes is "broken". When switching back and 
forth between CWU/CWL modes the TX frequency changes and the RX frequency does not which is wrong. This means that 
if you properly tune in a CW station (RX tone matches your offset) on CWU and switch to CWL the other station is no longer audible and 
he can't hear you. It should be possible to switch back and forth between CWU and CWL and still maintain contact.

See message #51983 for more details.

Cheers

Michael VE3WMB 

Re: Nextion Display programming, extension cable

Allen Merrell
 

That looks neat..
--
Allen  Merrell

Re: uBITX Version 4 first attempt #ubitx-help #ubitx

Andy V. Borisenko
 

Richard, good afternoon!
note, there are many people here who consider themselves radio engineers. but no one gives you advice on calibration.
I'll try with my bad English to tell you how to properly calibrate.
for this, it is tedious to measure and record the true value of the BFO frequency in the file.
for this you need: a commercial transceiver (I have FT-2000), an Android smartphone and an installed program Audio Frequency Counter ( or any similar), piece of wire.
the transceivers warm up for 30 minutes.
in the commercial transceiver we set 25.000.00 and usb.
Instead of the antenna, we connect a piece of wire and bring it close to the raduino. a commercial transceiver we find a raduino tone. for example: i have 25.003 50. next the smartphone will measure the frequency of AUDIO speaker. 
for example: freq in transceiver 25.003.500, audio freq 902 Hz. 25.003.500+902=25.004.402 this is the true frequency BFO you uBitx!!! 
this frequency must be written in the firmware file name ubitx_si5351.ino
for example: here are my changes      #define SI5351BX_XTAL 25004402          // Crystal freq in Hz 
this should be done with the help of the program arduino ide. 
how to do it (and it's very simple) let him tell someone from the engineers who speak English better than me.
After that, the tuning and calibration of the transceiver will take several minutes.
good luck!
 

Re: uBITX Version 4 first attempt #ubitx-help #ubitx

Andy V. Borisenko
 

let someone from the competent radio engineers check my method and tell here for everyone if it works.

Ubitx and QRP Guys Multi Z Tuner #ubitx-help

davedt1e@...
 

Hope this is an appropriate topic for the board.

Just built he QRP Guys Multi Z tuner and hooked it up to the Ubitx.  The Ubitx goes straight into TX on power up.  I was very careful in building the tuner and don't think I made any errors.

The antenna is a horizontal loop cut a bit over 40 meters and fed with ladder line.

The Ubitx behaves normally when using a dummy load or with loop hooked up for receive.

No balun is currently attached.

Any ideas as to what's happening?

Re: RFI from uBitx TX after AGC and other mods installed

John KC9OJV
 

Rick, If it's the PCB what about putting it below the ground plane in the same relative position as the suggested spot next to the RF relays?

John
KC9OJV

Re: Bitx40 75KHz Spurious, How to solve it. #bitx40

 

Akira,

I just put my uBitxr4 on the spectrum analyzer and found nothing +-250 Khz. That is 500 Khz BW.

I think your measurements are being affected by switch mode power supply in one of the items.

Raj

At 25-06-18, you wrote:
Hi!

I built Bitx40 about 2 weeks ago.

I measured the spurious of Bitx40 by using the spectrum analyzer.
The level of spurious of harmonics were under 50db. So this is fine.
But the spurious at 75KHz was observed.
The spurious might be the multiple of 25KHz.
It would be much appreciated if you could advise me the cause and solution of this spurious of Bitx40.

In Japan, we must prove to the authority that the spurious of the transceiver meets the criteria to obtain the certification of the transceiver from the authority.
So if i could not resolve this spurious, I will not be able to use Bitx40 in Japan.

Thanks in advance,
Akira
JJ1EPE

Re: Anyone seen an SSB xmit causing the menu to pop up?

M Garza <mgarza896@...>
 

Hi Gwen,
I had something similar on both SSB & CW.  Part of my problem was my 3amp laptop power supply was shutting down.  It reset the radio.  I got a 5 amp power supply to fix that issue.  After that, I had display issues, like you are describing.  I seemed to lock up the nano.  The screen would be on and the radio would transmit but the screen was blank and it would not go back to receive.  I fixed this by putting a clip on ferrite over all the wires coming from the Raduino.  
Interestingly, it only happened on 20M.  That is where my radio seems to have the best power efficiency.  I was using a 50 ohm dummy load when I was having these issues.  

Hope this helps.

Marco - KG5PRT 


On Sun, Jul 1, 2018, 7:43 AM Mvs Sarma <mvssarma@...> wrote:
learnt a point Farhan jee.


Regards
MVS Sarma
 

On Sun, Jul 1, 2018 at 12:06 PM, Ashhar Farhan <farhanbox@...> wrote:
check if your supply voltage is dropping on 'hellow'.

- f

On Sun, Jul 1, 2018 at 11:43 AM, Mvs Sarma <mvssarma@...> wrote:
Perhaps local radtion due to left over mismatch.
 It might be wiser to shield loose wires to/from audio amp /agc  by shielded wires and shield grounded on one side.
Also the power reaching to raduino could be passed thro a diode say 1N5401 and filtered by 100uF parallel 100nF.

All the best

Regards
MVS Sarma
 vu3zmv

On Sun, Jul 1, 2018 at 10:05 AM, brad martin <emclinux@...> wrote:
I too have seen this. I have yet to sort mine out and usually for me happens on an antenna and not the dummy load.

Brad
On Sun, Jul 1, 2018 at 12:34 AM Gwen Patton <ardrhi@...> wrote:
I was testing into a dummy load and noticed that when I whistled into the mike, or even spoke into it on higher frequencies, would cause the rig to react as if I had pressed the button on the encoder. It showed "Band Select >", and receive stopped. Pressing the encoder twice exited the menu normally. Is this RF getting into the switching transistor the encoder switch trips? How can I prevent this?

Gwen NG3P




Re: Bitx40 75KHz Spurious, How to solve it. #bitx40

 

Correction 500KHz span!

At 01-07-18, you wrote:
Akira,

I just put my uBitxr4 on the spectrum analyzer and found nothing +-250 Khz. That is 500 Khz BW.

I think your measurements are being affected by switch mode power supply in one of the items.

Raj

At 25-06-18, you wrote:
Hi!

I built Bitx40 about 2 weeks ago.

I measured the spurious of Bitx40 by using the spectrum analyzer.
The level of spurious of harmonics were under 50db. So this is fine.
But the spurious at 75KHz was observed.
The spurious might be the multiple of 25KHz.
It would be much appreciated if you could advise me the cause and solution of this spurious of Bitx40.

In Japan, we must prove to the authority that the spurious of the transceiver meets the criteria to obtain the certification of the transceiver from the authority.
So if i could not resolve this spurious, I will not be able to use Bitx40 in Japan.

Thanks in advance,
Akira
JJ1EPE

Re: Ubitx and QRP Guys Multi Z Tuner #ubitx-help

Howard Fidel
 

Yes, I have seen similar phenomena. In my case my CW wires to my key were too close to my 50 watt linear. Your tuner is probably radiating a lot of RF.

Howard


On 7/1/2018 9:24 AM, davedt1e@... wrote:
Hope this is an appropriate topic for the board.

Just built he QRP Guys Multi Z tuner and hooked it up to the Ubitx.  The Ubitx goes straight into TX on power up.  I was very careful in building the tuner and don't think I made any errors.

The antenna is a horizontal loop cut a bit over 40 meters and fed with ladder line.

The Ubitx behaves normally when using a dummy load or with loop hooked up for receive.

No balun is currently attached.

Any ideas as to what's happening?


Re: Ubitx and QRP Guys Multi Z Tuner #ubitx-help

davedt1e@...
 

Never mind for now.

It would appear that the problem now occurs without the tuner hooked up.  I've got some kind of mic or mic jack problem.  I guess it's just coincidence that it started when I hooked up the tuner.  Seems a little odd though.

Re: RFI from uBitx TX after AGC and other mods installed

Rick Price
 

I think it would be eaiser to shield the little pcb with foil before moving it due to the interconnect wires.  May try that first as the pcb is very small and mounted to the back of the RF Gain pot. The PCB is fabircated like Don explained in his first description of the board. My PCB is not the Kee's kit. I'll let you know how the shielding works out.
Rick
KN4AIE



From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of John KC9OJV
Sent: Sunday, July 01, 2018 9:49 AM
To: BITX20@groups.io
Subject: Re: [BITX20] RFI from uBitx TX after AGC and other mods installed

Rick, If it's the PCB what about putting it below the ground plane in the same relative position as the suggested spot next to the RF relays?

John
KC9OJV

Re: Anyone seen an SSB xmit causing the menu to pop up?

Gwen Patton
 

I'm running on a different battery than the jump box I was using before. It should have sufficient amperage. I'll test it with my bench supply and see if it does it under those conditions. It's odd, though, I was running my bench supply in current limit mode at 1.5 and 2 amps, and it didn't exhibit this behavior. It almost seemed like the RF was getting into the Nano and triggering the menu event for some reason. Very peculiar.

It behaves precisely as if I pushed the encoder knob in to operate the menu switch. I key the mike, speak loudly into it or whistle into it, and BAM, the radio goes into menu mode and receive stops. I can get out of it by pushing the knob twice to cycle band select mode, but it's annoying. I was just wondering if someone else spotted this behavior and added ferrites or some other solution. I'll keep fiddling with it.

Re: Anyone seen an SSB xmit causing the menu to pop up?

Jack, W8TEE
 

Quite a while ago I was messing with some Nano code, but had my FT-1200 on, too. I grabbed the mike and answered a CQ and I remember the Nano display changing when I activated the mic. It turns out that the coax to the antenna switch passed within inches of the Nano. I put two ferrite beads on the coax and it didn't happen again. FWIW.

Jack, W8TEE

On Sunday, July 1, 2018, 11:15:07 AM EDT, Gwen Patton <ardrhi@...> wrote:


I'm running on a different battery than the jump box I was using before. It should have sufficient amperage. I'll test it with my bench supply and see if it does it under those conditions. It's odd, though, I was running my bench supply in current limit mode at 1.5 and 2 amps, and it didn't exhibit this behavior. It almost seemed like the RF was getting into the Nano and triggering the menu event for some reason. Very peculiar.

It behaves precisely as if I pushed the encoder knob in to operate the menu switch. I key the mike, speak loudly into it or whistle into it, and BAM, the radio goes into menu mode and receive stops. I can get out of it by pushing the knob twice to cycle band select mode, but it's annoying. I was just wondering if someone else spotted this behavior and added ferrites or some other solution. I'll keep fiddling with it.

Re: RFI from uBitx TX after AGC and other mods installed

Lawrence Galea
 

Did you put 100n, 10n, 1n filter capacitors  all in parallel on both input and output directly across the 78L05 leads?
.


On Sun, Jul 1, 2018 at 2:31 PM, Rick Price <rickprice48@...> wrote:
John, Don, others,
Yesterday I attached a 78L05 (TO220) directly to the back of the AGC board that is mounted to the RF gain control on the front panel. Bypassed all power leads and ran a separate power lead to the 12V regulator that powers my uBitx. In other words the AGC board had its own isolated(?) power source. Stll heard the audio when transmitting.  Beginning to think that radiated power is being absorbed by the AGC board and then recitifed and then coupled into the audio system. I also have the pop click board installed and not sure if this was a problem before it was installed. My AGC board is one I fabricated using Don's technique of cutting pcb with an x-acto knife.  I also have a AGC board made on perf board using through hole parts.  May sub that in and see if there are any changes. I eventually plan on installing the JackAl mod when it becomes available so this problem should go away for me but its beginning to become a challenge to fix.
 
Rick KN4AIE


From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of John KC9OJV
Sent: Sunday, July 01, 2018 8:05 AM
To: BITX20@groups.io
Subject: Re: [BITX20] RFI from uBitx TX after AGC and other mods installed

Don,
I spent part of yesterday applying ferrites to this and that to little success. I also tried wrapping the 5v line around the twisted pair coming from the volume pot and that did some good. This morning I was thinking about fixing a 7805 to the metal base of my case, drilling a hole in the ground plane and routing a wire through that hole to feed the AGC board. It could be driven off the 12v relay (K1?). Has anyone else had any ideas/success?

John
KC9OJV


Re: RFI from uBitx TX after AGC and other mods installed

Lawrence Galea
 

Also try putting a 100n directly across Q1 base-emitter on the AGC board.
It will cut off some of the higher AF as it would be in series with C1 to earth across the Af gain control.  
However, this would not be of any serious consequences.
If you don't want as much AF HF cut off you can try a smaller capacitor, say 10n.
I am thinking that Q1 base-emitter junction is acting as a detector and the AF is being coupled back to the AF gain control since the level is varying with the AF Gain control.
One could also add say a 10n capacitor directly on pin 7 of the TDA2822 or across the AF Gain control as an rf decoupling.
Can you try and report?


On Sun, Jul 1, 2018 at 5:33 PM, Lawrence Galea <9h1avlaw@...> wrote:
Did you put 100n, 10n, 1n filter capacitors  all in parallel on both input and output directly across the 78L05 leads?
.


On Sun, Jul 1, 2018 at 2:31 PM, Rick Price <rickprice48@...> wrote:
John, Don, others,
Yesterday I attached a 78L05 (TO220) directly to the back of the AGC board that is mounted to the RF gain control on the front panel. Bypassed all power leads and ran a separate power lead to the 12V regulator that powers my uBitx. In other words the AGC board had its own isolated(?) power source. Stll heard the audio when transmitting.  Beginning to think that radiated power is being absorbed by the AGC board and then recitifed and then coupled into the audio system. I also have the pop click board installed and not sure if this was a problem before it was installed. My AGC board is one I fabricated using Don's technique of cutting pcb with an x-acto knife.  I also have a AGC board made on perf board using through hole parts.  May sub that in and see if there are any changes. I eventually plan on installing the JackAl mod when it becomes available so this problem should go away for me but its beginning to become a challenge to fix.
 
Rick KN4AIE


From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of John KC9OJV
Sent: Sunday, July 01, 2018 8:05 AM
To: BITX20@groups.io
Subject: Re: [BITX20] RFI from uBitx TX after AGC and other mods installed

Don,
I spent part of yesterday applying ferrites to this and that to little success. I also tried wrapping the 5v line around the twisted pair coming from the volume pot and that did some good. This morning I was thinking about fixing a 7805 to the metal base of my case, drilling a hole in the ground plane and routing a wire through that hole to feed the AGC board. It could be driven off the 12v relay (K1?). Has anyone else had any ideas/success?

John
KC9OJV



Re: Ubitx and QRP Guys Multi Z Tuner #ubitx-help

Lawrence Galea
 

Are you using screened enclosures for the μbitx and tuner?


On Sun, Jul 1, 2018 at 4:14 PM, <davedt1e@...> wrote:
Never mind for now.

It would appear that the problem now occurs without the tuner hooked up.  I've got some kind of mic or mic jack problem.  I guess it's just coincidence that it started when I hooked up the tuner.  Seems a little odd though.


Re: Anyone seen an SSB xmit causing the menu to pop up?

M Garza <mgarza896@...>
 

Gwen,
I still suggest trying the ferrite on the Raduino wires.  Your issue will probably go away.

Does it happen on any frequency or just specific bands?

I doubt the power source will matter.  If you turn off the current limiting on your bench supply, it will probably do the same thing.  

Just things to try.

Good luck,

Marco - KG5PRT 

On Sun, Jul 1, 2018, 10:15 AM Gwen Patton <ardrhi@...> wrote:
I'm running on a different battery than the jump box I was using before. It should have sufficient amperage. I'll test it with my bench supply and see if it does it under those conditions. It's odd, though, I was running my bench supply in current limit mode at 1.5 and 2 amps, and it didn't exhibit this behavior. It almost seemed like the RF was getting into the Nano and triggering the menu event for some reason. Very peculiar.

It behaves precisely as if I pushed the encoder knob in to operate the menu switch. I key the mike, speak loudly into it or whistle into it, and BAM, the radio goes into menu mode and receive stops. I can get out of it by pushing the knob twice to cycle band select mode, but it's annoying. I was just wondering if someone else spotted this behavior and added ferrites or some other solution. I'll keep fiddling with it.