Date   

Re: Baofeng microphone mod for BITX

Craig Wadsworth
 

Andrew,
Thanks for sharing the nice graphic.
I have several Baofeng speaker / mics and headsets. This will help.
Regards,
Craig




Craig Wadsworth, ATP, RET, PE
Illinois Assistive Technology Program


Today is World Amateur Radio Day!

 

Congratulations!!!

Today is World Amateur Radio Day!

04/18/2017

Today is World Amateur Radio Day (WARD), marking the 92nd anniversary of the International Amateur Radio Union (IARU). Radio amateurs around the world are getting on the air, “Celebrating Amateur Radio’s Contribution to Society” — the WARD theme. WARD commemorates the day in 1925 when Amateur Radio pioneers, including ARRL co-founder Hiram Percy Maxim, 1AW, met in Paris and created the IARU to support Amateur Radio worldwide.

“On this, International Amateur Radio Day maybe we should pause to reflect on how Amateur Radio friendships around the globe enrich our lives,” ARRL President Rick Roderick, K5UR, and ARRL CEO Tom Gallagher, NY2RF, said in a joint statement. “Not the least of Amateur Radio's purpose is fostering international understanding and goodwill. So thanks to all of you who make it possible. We are grateful to have you as valued colleagues.” 

From the 25 countries that formed the IARU in 1925, the IARU has grown to include 160 member-societies in three regions. IARU Region 1 includes Europe, Africa, the Middle East, and Northern Asia. Region 2 covers the Americas, and Region 3 is comprised of Australia, New Zealand, the Pacific island nations, and most of Asia. The International Telecommunication Union (ITU) has recognized the IARU as representing the interests of Amateur Radio.

Groups promoting WARD activity on social media are using #WorldAmateurRadioDay on Twitter and Facebook. IARU lists all WARD activities on its World Amateur Radio Day page.

73's Jc


Re: Unable to tune

Fred
 

My buddy’s VFO died and stopped tuning after he soldered the capacitor onto the tuning pot, he left the pot connected to the VFO while doing the soldering.

The fix was to swap A7 and A6 in the sketch, then recompile and reload the Arduino and move the tuning pots wiper wire to A6. (one pin down).

Might try that…73.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of KW4YH
Sent: Tuesday, April 18, 2017 8:41 AM
To: BITX20@groups.io
Subject: [BITX20] Unable to tune

 

Just got my bitx40 together and when I turn it on it'll tune down in frequency a little bit and stay there. See this video: https://youtu.be/2N5pLJ1sjzs  Adjusting the tuning pot does nothing. I've verified that voltage on the tuning knob is going from ~0-5v and the voltage is getting to the analog pin of the Arduino. 

 

Any thoughts? Thanks!


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Re: tuning clicks (continued)

Fred
 

Here is the fix that I used and it worked for me.

Reduced the power dissipated in the LM7805 on the Arduino VFO and eliminated the tuning clicks. I mounted the LM7809 to the side of my enclosure (metal).

Bitx VFO Regulator.jpg

R1 must not drop more than 2 volts to ensure that the Arduino VFO’s LM7805 has head room to regulate to 5 volts. Mine drops about 1 volt but still decouples the Main supply from the VFO and thus eliminates the clicks.  Might not work for everyone but it’s a simple circuit to try. C3 of 270 mfd worked fine but I had some junk box 470 mfds so I used that value. All caps should be at least 16volts.

Good Luck…

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Andrew Mason
Sent: Tuesday, April 18, 2017 7:18 AM
To: BITX20@groups.io
Subject: Re: [BITX20] tuning clicks (continued)

 

The issue is not the software - the simple fix is to decouple the power supply for the Arduino based VFO from the BITX40 radio board.

I can not claim to have developed the solution, but have found it posted by Glenn VK3YY on his Wordpress Blog.

Glenn notes that the tuning clicks "can be removed with a series 10 Ohm resistor to the Raduino supply and a 470uF capacitor to ground on the Raduino side".

I did not have these component in my junk box, and have used 2 x 220uF capacitors and an 8.2 Ohm resistor. The result was the same.  

I have gone from loud and annoying clicks while tuning to no clicks at all.

73

Andrew

VK4JAM

 

 


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Re: Bitx-40 Receives - Not transmitting

Michael Davis <maddmd818@...>
 

There are some additional Bitx videos on you tube. One in particular is Randy K7AGE on building a QRP dummy load for those of us that don't have an accurate power measurement device. It is modeled after the Elecraft QRP kit. See https://youtu.be/O9FLgWoyfsY. Also on you tube, Dave Casler has a very recent, live audio comparison between his base Yaesu and the Bitx, very different sounding. I too get muffled audio reports and his test equipment shows why. I, as some of you have done, have downloaded the free tone generator app on my phone, so I don't need to do the huuummmmm thing to read the PA power draw, and to read rf power output. This project sure has brought many tricks out of the bag, huh?

Sent from Mike's iPad WA1MAD


Unable to tune

KW4YH
 

Just got my bitx40 together and when I turn it on it'll tune down in frequency a little bit and stay there. See this video: https://youtu.be/2N5pLJ1sjzs  Adjusting the tuning pot does nothing. I've verified that voltage on the tuning knob is going from ~0-5v and the voltage is getting to the analog pin of the Arduino. 


Any thoughts? Thanks!


Re: Bitx-40 Receives - Not transmitting

MVS Sarma
 

In fact, I remove the back lit supply from regulated to shifting to unregulated with slightly higher resistor for current limiting. Thus  the load on 7805 reduces.

On Tue, Apr 18, 2017 at 5:22 PM, Raj vu2zap <rajendrakumargg@...> wrote:
Everyone complains on the display regulator. Heat sink, a preregulator or a small high wattage wire wound resistor to drop some of the voltage
will spread out the heat. Best remove the regulator and mount on metal chassis and wire it to the board.

My analog VFO version draws more than an 1A and since I use a preamplified motorola GM300 mic, the output shows more than 10W with 12V
but must be distorting. I speak a little away but I will add a gain for the mic stage.

At 18/04/2017, you wrote:
>Ok I will reset it to 100mA PA current. One think I don't like is the regulator on the display. That's getting to hot for my liking so I'm going to put a small heat sink on it.
>
>Sent from my iPhone
>
>> On 18 Apr 2017, at 17:46, "Raj vu2zap" <rajendrakumargg@...> wrote:
>>
>> Paul,
>>
>> Set the idling current AT the final power plug to 100mA. If you set more it runs hot.
>>
>> I suspect you mean 300mA for the whole board.
>>
>> Cheers
>> Raj
>>
>> At 18/04/2017, you wrote:
>>
>>> Set the bias current to around 300mA and now I get 1.5 watts of RF with a continues 1.5khz tone at the mic input.







--
Regards
Sarma
 


Re: Bitx-40 Receives - Not transmitting

 

Everyone complains on the display regulator. Heat sink, a preregulator or a small high wattage wire wound resistor to drop some of the voltage
will spread out the heat. Best remove the regulator and mount on metal chassis and wire it to the board.

My analog VFO version draws more than an 1A and since I use a preamplified motorola GM300 mic, the output shows more than 10W with 12V
but must be distorting. I speak a little away but I will add a gain for the mic stage.

At 18/04/2017, you wrote:
Ok I will reset it to 100mA PA current. One think I don't like is the regulator on the display. That's getting to hot for my liking so I'm going to put a small heat sink on it.

Sent from my iPhone

On 18 Apr 2017, at 17:46, "Raj vu2zap" <rajendrakumargg@...> wrote:

Paul,

Set the idling current AT the final power plug to 100mA. If you set more it runs hot.

I suspect you mean 300mA for the whole board.

Cheers
Raj

At 18/04/2017, you wrote:

Set the bias current to around 300mA and now I get 1.5 watts of RF with a continues 1.5khz tone at the mic input.


Re: tuning clicks (continued)

Andrew Mason - VK4LK
 

The issue is not the software - the simple fix is to decouple the power supply for the Arduino based VFO from the BITX40 radio board.

I can not claim to have developed the solution, but have found it posted by Glenn VK3YY on his Wordpress Blog.

Glenn notes that the tuning clicks "can be removed with a series 10 Ohm resistor to the Raduino supply and a 470uF capacitor to ground on the Raduino side".

I did not have these component in my junk box, and have used 2 x 220uF capacitors and an 8.2 Ohm resistor. The result was the same.  

I have gone from loud and annoying clicks while tuning to no clicks at all.

73

Andrew

VK4JAM


 


Re: Bitx-40 Receives - Not transmitting

Nemo
 

Ok I will reset it to 100mA PA current. One think I don't like is the regulator on the display. That's getting to hot for my liking so I'm going to put a small heat sink on it.

Sent from my iPhone

On 18 Apr 2017, at 17:46, "Raj vu2zap" <rajendrakumargg@...> wrote:

Paul,

Set the idling current AT the final power plug to 100mA. If you set more it runs hot.

I suspect you mean 300mA for the whole board.

Cheers
Raj

At 18/04/2017, you wrote:

Set the bias current to around 300mA and now I get 1.5 watts of RF with a continues 1.5khz tone at the mic input.



Re: Bitx-40 Receives - Not transmitting

 

Paul,

Set the idling current AT the final power plug to 100mA. If you set more it runs hot.

I suspect you mean 300mA for the whole board.

Cheers
Raj

At 18/04/2017, you wrote:

Set the bias current to around 300mA and now I get 1.5 watts of RF with a continues 1.5khz tone at the mic input.


Microphone options

Simon Rumble <simon@...>
 

Hi folks.

I made my first QSO on the BitX40 over the long weekend, operating portable out in the bush from a battery. The received quality was very poor on both QSOs I managed to get, 5/1 and 4/1. I suspect my poor soldering technique on the microphone hasn't helped. The very low dipole wouldn't have improved things either. I only seem to be pushing out about 3 watts on my meter when I shout into the mike.

So I'd like to buy a commercial radio mike with integrated PTT and wire it up. Is there anything special about the microphone or can I just buy any old one I see?

And here's a picture of my setup. Now that I've used it for reals, I have plans to make it more suitable for portable use. Screen on top, recessed controls for easy carriage, integrated coupler for an end fed wire, smaller, maybe even get a LiPo battery built in.



Re: Bitx-40 Receives - Not transmitting

Nemo
 

I just sorted my Bitx 40 put with no TX. One problem was me as I just forgot to connector the 12 volts to the PA but that was not the end of it. Still no TX. I tracked it back to the bias pot. 5 volts at the input but no volts at the wiper. But after moving it from one end to the other several times it started to work correctly. I then
Set the bias current to around 300mA and now I get 1.5 watts of RF with a continues 1.5khz tone at the mic input.
Others have reported 3 watts but it will do for now until I get the tuning clicks sorted.
Paul  

Sent from my iPhone

On 18 Apr 2017, at 10:51, "Tim Dezellem" <tdezellem@...> wrote:

My radio has the same problem. I have spend a lot of time but haven't nailed the source of the problem.

My only suggestion is find a friend with same board and test your board in their enclosure and see if your board works. 

This will test your connections. I am disappointed in the board i received. 

Best of luck,

Tim


Re: Baofeng microphone mod for BITX

College Professor Simon Thompson <nwccenglishprofessor@...>
 

I literally wrote the connections down on the back of an envelope. I will open up my radio and figure out what I did.

On Apr 17, 2017, at 9:33 PM, College Professor Simon Thompson <nwccenglishprofessor@...> wrote:

I made the connections from the BitxX40 to the Baofeng microphone without any modifications. It works perfectly, and I don’t know why anyone would go to the trouble of rewiring the mic if it weren’t a sheerly technical exercise.

I can provide a sense of the connections, but I suspect the wire colours are different for each batch of Baofeng pics.
On Apr 17, 2017, at 6:59 AM, kd2iog@... wrote:

Just assembled my kit and am having trouble with my Baofeng mic, this is perfect. Thanks for posting!


Just have to fix a minor wiring slip up for the raduino and put the antenna up and I should be okay.


Brian

K2BRZ




Re: Baofeng microphone mod for BITX

College Professor Simon Thompson <nwccenglishprofessor@...>
 

I made the connections from the BitxX40 to the Baofeng microphone without any modifications. It works perfectly, and I don’t know why anyone would go to the trouble of rewiring the mic if it weren’t a sheerly technical exercise.

I can provide a sense of the connections, but I suspect the wire colours are different for each batch of Baofeng pics.

On Apr 17, 2017, at 6:59 AM, kd2iog@... wrote:

Just assembled my kit and am having trouble with my Baofeng mic, this is perfect. Thanks for posting!


Just have to fix a minor wiring slip up for the raduino and put the antenna up and I should be okay.


Brian

K2BRZ



Re: Baofeng microphone mod for BITX

Andrew Mason - VK4LK
 

Hi,

I am also using a Baofeng microphone on my BITX40, it is the microphone designed for the UV5R that I also have.  

I use the microphone "as is" - not modified. This way I can use the microphone on both radios :-)

I am a little confused as to why there is a need to re-wire the Baofeng microphone ???  

It is just a matter of making the right connections back to the BITX40 cables that are supplied with the BITX40 kit.

The standard insert with the Baofeng microphone is fine, and sounds great.  The wiring diagram showing how the cables need to be connected is attached below.


Image result for baofeng microphone pinout


73

Andrew

VK4JAM


Re: Bitx-40 Receives - Not transmitting

Tim Dezellem
 

My radio has the same problem. I have spend a lot of time but haven't nailed the source of the problem.

My only suggestion is find a friend with same board and test your board in their enclosure and see if your board works. 

This will test your connections. I am disappointed in the board i received. 

Best of luck,

Tim


Re: Out of the box.

Nemo
 

Hi Steve. I know what you mean. I did do some simple programming but it just didn't rock my boat like RF does but I agree with I will have a go with this one as I can see there are some many things I can do with this radio. I'm old and do old school stuff but I can still lean new things with this.
Paul 

Sent from my iPhone

On 18 Apr 2017, at 08:54, "Steve Wright" <SteveWrightNZ@...> wrote:

On 18/04/17 13:43, Jack Purdum via Groups.Io wrote:
He's absolutely right. Anyone who has the brains to get a license is smart enough to program. I honestly believe anyone who wants to program, can.

Coding, or writing something detailed and complex from scratch is a fairly daunting task, but altering a few frequencies in a table or changing the band edges is perfectly trivial.

If people don't think they can "code", then I do encourage them to set up the software suite, firstly write the latest version of the firmware, and then have a wee browse of the code and make a few "adjustments" and write your new custom firmware to the radio!  An excellent opportunity to dabble in radio firmware that you just not get elsewhere, so get in there and fiddle!

As others have said - there is nothing to break, and if you do bork it, simply upload a known-good version and you're all fixed!  It's much easier and safer than hardware mods, and far more difficult to break anything - if not impossible..


Steve ZL1BHD


Re: Out of the box.

Steve Wright
 

On 18/04/17 13:43, Jack Purdum via Groups.Io wrote:
He's absolutely right. Anyone who has the brains to get a license is smart enough to program. I honestly believe anyone who wants to program, can.

Coding, or writing something detailed and complex from scratch is a fairly daunting task, but altering a few frequencies in a table or changing the band edges is perfectly trivial.

If people don't think they can "code", then I do encourage them to set up the software suite, firstly write the latest version of the firmware, and then have a wee browse of the code and make a few "adjustments" and write your new custom firmware to the radio!  An excellent opportunity to dabble in radio firmware that you just not get elsewhere, so get in there and fiddle!

As others have said - there is nothing to break, and if you do bork it, simply upload a known-good version and you're all fixed!  It's much easier and safer than hardware mods, and far more difficult to break anything - if not impossible..


Steve ZL1BHD


Re: Out of the box.

Jack Purdum <econjack@...>
 

He's absolutely right. Anyone who has the brains to get a license is smart enough to program. I honestly believe anyone who wants to program, can.

Jack, W8TEE



From: College Professor Simon Thompson <nwccenglishprofessor@...>
To: BITX20@groups.io
Sent: Monday, April 17, 2017 8:06 PM
Subject: Re: [BITX20] Out of the box.

As a marine engineer, you probably have a good head for math and calculation. I wish I did!

Sent from my iPad

On Apr 17, 2017, at 5:00 PM, N7PXY <hickspj467@...> wrote:

Paul,
Neither am I. I was a marine engineer on the big ships. I know my wrenches and steam plant stuff but programming was fairly new. Like 35 years ago.
Jump in. Read some sketches and you'll soon get a feel for the structure and syntax of the language. It's very 'intuitive' although the math structure of the pro programmers is sometimes esoteric at best. The math is simple but the tricks used by the experienced programmers is often not. Try plugging in stuff into sketches and see what happens. Worse case, you have to reload the original sketch.

PJH