Date   

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" <@Raj> 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
 

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" <@Raj> 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
 

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



Re: Bitx-40 Receives - Not transmitting

Jerry Gaffke
 

Check out this post:   https://groups.io/g/BITX20/message/23640


On Mon, Apr 17, 2017 at 02:25 pm, Bob KD4JRT wrote:

Does anyone have Oscilloscope, and meter values to check to try and find why

I have no output?

 


Re: Out of the box.

Simon Thompson <simonthompson67@...>
 

I had a ZX81! Basic Rules!

On Apr 17, 2017, at 5:56 PM, Paul Swift <paulswift6@...> wrote:

I tried to lean programming years ago now and I did right one in basic or something on my first computer. ZX80. But I just don't understand it and decided it's not for me.  I have Doctors degree in thermionic devices but that's not any good these days. Ivan make RF dance of I won't to but ones and zeros nothing. Lol 

Sent from my iPhone

On 18 Apr 2017, at 07:00, "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



Re: Out of the box.

Nemo
 

I tried to lean programming years ago now and I did right one in basic or something on my first computer. ZX80. But I just don't understand it and decided it's not for me.  I have Doctors degree in thermionic devices but that's not any good these days. Ivan make RF dance of I won't to but ones and zeros nothing. Lol 

Sent from my iPhone

On 18 Apr 2017, at 07:00, "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


Re: Out of the box.

Nemo
 

Not a problem I have been working in RF for well over 50 years. I designed my first TX and RX when I was 16 and still in school. Been doing it ever since and designing antenna for about the same time from VLF to microwave. I just can't stop doing it. 
So yes I can help where I can.
Paul

Sent from my iPhone

On 18 Apr 2017, at 06:38, "College Professor Simon Thompson" <nwccenglishprofessor@...> wrote:

I don't know much about programming either, but this forum is a fantastic resource for people like us. There are people who do know about programming; I am certain your experience with RF design will be very much welcome here.  All sorts of questions about every aspect of the hobby.

Sent from my iPad

On Apr 17, 2017, at 4:32 PM, Paul Swift <paulswift6@...> wrote:

Hi PJH.
Yes I have been reading some of the others comments. I'm a RF design engineer do it should not take me long to find the problem. It's time I don't have.
I love QRP. And have many TRX here that I have built in the past.
I like this Bitx 40 and hope to have many hours using it.
The problem is I'm not a one and zero man so I have no idea how to program anything. 
Just RF radio stuff and antennas is my field of expertise are in not programming.
Paul 

Sent from my iPhone

On 17 Apr 2017, at 23:26, "N7PXY" <hickspj467@...> wrote:

Paul,

Welcome to the group.

You will find a great resource here to answer your questions.

The issues you mentioned have been addressed and there are several 'fixes' for them. Check out the files etc. for information and links to mods and tips sites.

PJH, N7PXY


Re: Where to connect frequency counter - HFSigs Bitx40

ohwenzelph
 

If you go to hfsigs.com and go to "wire up" Andy then down the page to "alignment.." and zoom in on the picture, it seems to indicate the collector of Q7. Would the base be a better spot?

thanks


Re: Weird magic smoke...

Daniel Kuecker
 

Well, apparently I do not know the difference between purple and green. I swapped those so the purple was in the center and now it works great! Sorry for the stupidity, guys/gals... Now i am getting bad reception, but that could be my antenna which I will be trouble-shooting shortly. Thanks for the help, you guys/gals are great!


Re: Badly distorted xmit audio, RV1 only adjusts to 60 mA

Steve Greer
 

you might have to adjust the base to get full output.  The other VR be carefull you can overdrive it fast.  i hooked my thermometer from my meter to the heatsink to monitor heat.Good luck hope that helps.  try for a net 7.185 has a couple nets in the evening. Nata net and Omiss open to all operators with proper lic for the band seqment.

On Mon, Apr 17, 2017 at 6:52 PM, Bob <nobody.really@...> wrote:

   Thanks Steve!  I think I had a flaky connection on microphone jack that was the source of the 60Hz hum / noise - now I'm down to just badly distorted audio, but at least that matches the "near receiver" symptoms.   If I get a path open to a webSDR site, I'll give that a try.   The K3FEF sitewas already a great help in calibrating my display on the RX side.

    The fact I can't get the RV1 adjustment correct has me concerned that there's something else amiss, though.

   I'm using the microphone element that came with the kit, but just for a test I tried another one (new) with the same results, but that's another thing crossed off the list.

73,

  Bob