Date   
Re: TDA2228M

ae1ct1998 <AE1CT1998@...>
 

THANKS FOR THE INFO MIKE. NOW CAN YOU TELL ME WHAT RV1 DOES? I KNOW RV2 AND RV3 ADJUST THE PA CURENT.

On Tue, Mar 13, 2018 at 2:42 PM, Mike Woods <mhwoods@...> wrote:
Did you adjust the BFO?  They come way off frequency with audio as you describe.  Press the rotary encoder button and select Settings.  Press again when display reverts l and select BFO calibrate in the menu.

Mike

On Wed, 14 Mar 2018 at 6:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT


Re: RD16HHF1 power curve flattening...some

K9HZ <bill@...>
 

Nick... no need to upgrade those T30s.  Remember they only have to dissipate the harmonic power not the primary. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Mar 13, 2018, at 7:39 PM, Nik VK4PLN <nickpullen@...> wrote:

Nice work Glen.

I am still to solve my oscillation issue on 20m+, but I have also decided to upgrade the LPF toroids to T50-6, I am concerned that the T30 will be overwhelmed at 20W output... Maybe need to do all the emitter 220 caps... and play with the feedback loop on the RD16.

I did order a bunch of the MPSH10 too. They have a different pinout to the 3904s? so have to go in the place twisted, like the RD16.... ?

73 Nick,

Re: TDA2228M

Mike Woods
 

RV1 is used to set the drive level.

M


On Wed, 14 Mar 2018 at 2:35 PM, ae1ct1998 <AE1CT1998@...> wrote:
THANKS FOR THE INFO MIKE. NOW CAN YOU TELL ME WHAT RV1 DOES? I KNOW RV2 AND RV3 ADJUST THE PA CURENT.

On Tue, Mar 13, 2018 at 2:42 PM, Mike Woods <mhwoods@...> wrote:
Did you adjust the BFO?  They come way off frequency with audio as you describe.  Press the rotary encoder button and select Settings.  Press again when display reverts l and select BFO calibrate in the menu.

Mike

On Wed, 14 Mar 2018 at 6:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT


Re: TDA2228M

Gordon Gibby
 

Here is RV1 in the circuit:

image1.png

It’s between two stages in the transmitter amplification series of 4 stages.



On Mar 13, 2018, at 21:35, ae1ct1998 <AE1CT1998@...> wrote:

THANKS FOR THE INFO MIKE. NOW CAN YOU TELL ME WHAT RV1 DOES? I KNOW RV2 AND RV3 ADJUST THE PA CURENT.

On Tue, Mar 13, 2018 at 2:42 PM, Mike Woods <mhwoods@...> wrote:
Did you adjust the BFO?  They come way off frequency with audio as you describe.  Press the rotary encoder button and select Settings.  Press again when display reverts l and select BFO calibrate in the menu.

Mike

On Wed, 14 Mar 2018 at 6:57 AM, ae1ct1998 <AE1CT1998@...> wrote:
I WAS GIVEN A MICROBITX 40 RADIO WITH A BLOWN TDA2228M CHIP. I REPLACED THE CHIP AND NOW I HAVE AUDIO BUT ITS VERY LOW AND THERES A HIS ON THE HEADPHONES, MY QUESTION IS DOES ANYONE KNOW WHERE I SHOULD LOOK TO TRY AND FIX THIS ISSUE. I CAN HEAR STATIONS BUT THERE IS NO MID OR LOW RANGE JUST HI'S. IVE TRIED TO FIND A SCHEMATIC FOR THIS RADIO ON LINE BUT THE ONLY ONE I CAN FIND IS PRINTED WITH VERY LITE INK, NOTHING READABLE. ANY HELP WOULD APRECIATED.

GARY
AE1CT


Re: #uBITX Firmware KD8CEC - IF-Shift etc. #ubitx

Guy N7BIR <sgbridge@...>
 

Thanks for the tips Jerry. Will recheck Q90 again and also R81. 

73,
Guy

Re: Complaint Department

Michael Hagen
 

Your site is the Best, Thanks.

It takes a lot of work to keep a website up to date.

Keep Going!

Mike, WA6ISP


On 3/13/2018 4:05 PM, Mike Woods wrote:
Obviously I would be happy to curate an Errata page.  However, it may be better to have this on the HF Signals website in terms of giving confidence to new constructors.

I would be happy to curate such a page and Ashhar Farhan could always amend if he didn't agree with me!

Mike ZL1AXG ubitx.net


On 14/03/18 7:13 AM, Jerry Gaffke via Groups.Io wrote:
Could be to the wiki.
But if so, then all 10000 members of this forum could be editing it.

I think a curated errata page on ubitx.net would be preferable for new builders.
But by all means, we can have a wiki errata page, where we all pile in with our own perhaps conflicting suggestions.

Jerry


On Tue, Mar 13, 2018 at 10:42 am, Vince Vielhaber wrote:
If there's going to be a link to errata, it could be a link to the wiki page on errata. Doesn't have to be one pointing to the first page of it making anyone dig around for anything. For all that matter, a link on the first page of the wiki to errata would help as well for someone who just went straight there.


--
Mike Woods
mhwoods@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: RD16HHF1 power curve flattening...some

Glenn
 

Nick, yes the pin-out is different so you need to twist it around a bit. Easy done.

Re: Complaint Department

John Backo
 

What is being proposed here is a bit like
a proposal to herd cats. I suppose it could
be done, but is probably more work than it is worth.
It is common to just about all human endeavors that
are worth anything...

Refer all to the ubitx.net site for fixes and the BITX Hacks
site for mods. It is a whole lot simpler. Hi.

Of course, every real ham worth anything will elmer any
question that comes up. That's tradition if nothing else.
Yeah, sometimes it is a nuisance but...considering the
alternative...maybe not so much.

The point has been made several times that we are
supposed to be adults and act as such. 'Nuff said.

An amaxzing amount of learning can take place merely
by reading everything in the files section. And going
through messages will reveal to most something they
didn't know before. That's good.

john
AD5YE

Re: Complaint Department

John Backo
 

Incidentally, I did edit "amaxzing" properly.
Hmmm...maybe there is a bug somewhere.
At least it isn't all my old brain. Hi.

john
AD5YE

Re: Complaint Department

Ashhar Farhan
 

On thr hfsigs site, or anything else that I endorse or recommend, I never do that without having tried it myself. That is the unfortunate part of pursuing experimental methods. It is also good in that whatever mods are on hf, if any, they are robust.
There is the bitxhacks blog, the ubitx.net for the rest. 
I am going to put those links with the caveats on the ubitx page. Is that a good option?
This reminds me of a software piece that knith once wrote about : be careful with the abive code, i have only proved it to be correct, i havent tried it.
- f

On 14 Mar 2018 9:03 am, "Michael Hagen" <motdog@...> wrote:

Your site is the Best, Thanks.

It takes a lot of work to keep a website up to date.

Keep Going!

Mike, WA6ISP


On 3/13/2018 4:05 PM, Mike Woods wrote:
Obviously I would be happy to curate an Errata page.  However, it may be better to have this on the HF Signals website in terms of giving confidence to new constructors.

I would be happy to curate such a page and Ashhar Farhan could always amend if he didn't agree with me!

Mike ZL1AXG ubitx.net


On 14/03/18 7:13 AM, Jerry Gaffke via Groups.Io wrote:
Could be to the wiki.
But if so, then all 10000 members of this forum could be editing it.

I think a curated errata page on ubitx.net would be preferable for new builders.
But by all means, we can have a wiki errata page, where we all pile in with our own perhaps conflicting suggestions.

Jerry


On Tue, Mar 13, 2018 at 10:42 am, Vince Vielhaber wrote:
If there's going to be a link to errata, it could be a link to the wiki page on errata. Doesn't have to be one pointing to the first page of it making anyone dig around for anything. For all that matter, a link on the first page of the wiki to errata would help as well for someone who just went straight there.


--
Mike Woods
mhwoods@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

#uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

ge_clipboard
 

Hello Ian

Made some test transmissions with the new version and, as you can see on wsprnet.org, the signals are heard all around from the uBitx on a 42m vertical delta loop. All settings left as per factory, no corrections anywhere.

Is it not possible to adjust the soundlevel by the software to control the output?

Many thanks and 73, Gerald - HB9CEY

#ubitx Firmware KD8CEC - IF-Shift etc. #ubitx

ge_clipboard
 

Hello All

Many thanks for all the interesting answers to my questions at the beginning of this topic! Having thought of starting such a lengthy conversation. One can learn a lot, but I must admit, some are also irritating to me what I should/can do, to set the settings correct ;-). So for today, I‘m leaving the settings as per factory and take my time to sort all the answers.

73, Gerald - HB9CEY

Digital BFO Mod: Terrible Audio! #bitx40help

Ryan Flowers
 

Hello Everyone,

I've been working on my own digital VFO/BFO for my BITX40. The goal: Switch sidebands without inverting the VFO to 19mhz for 40M and 26mhz for 20M. I've got it working, mostly, but I'm having one heck of a time with audio quality. The 12mhz crystals not 12mhz but rather 11,984,800 and currently I have my sidebands at 11994420 for USB and 11996450 for LSB. These are 2030 and 4060hz away from the crystal frequency, and I am having a hard time visualizing how that works. But at any rate, these are the what I came up with mostly through trial and error. 

I'm currently using a modified version of the uBITX sketch. I've added the offset frequency (11984800, named vfoOffset) and lsbCarrier and am using the following to do my tuning:

  if (isUSB){
    si5351bx_setfreq(0, vfoOffset + frequency);
    si5351bx_setfreq(1, usbCarrier);
  }
  else{
    si5351bx_setfreq(0, vfoOffset + frequency);
    si5351bx_setfreq(1, lsbCarrier);

  }
I've also added menu items for adjusting the USB/LSB and Offset easily, and using these I adjusted for best inbound audio and ended up with the aforementioned values. When I tune the radio to 7074mhz and select USB, I'm not getting *any* decodes on FT8- but it works on LSB... What on earth? The other thing is that audio output (as tested by transmitting into a dummy load and listening on my Kenwood) is just terribly choppy and unintelligible. I've tried varying the signal output strength of the si5351 clocks from 2ma to 8ma, no difference. It sounds terribly over-modulated.

I have gotten in over my head, but I'm determined. Can somebody help me understand this so I can not just complete this project but get a better understanding? Thanks so much.

-- 
Ryan Flowers - W7RLF
MiscDotGeek.com
Multi Band BITX40
The BITX40 FAQ

Re: Digital BFO Mod: Terrible Audio! #bitx40help

Allard PE1NWL
 

Hi Ryan,

"Switch sidebands without inverting the VFO to 19mhz"
Raduino v2 for BitX40 already has exactly this functionality, perhaps you
could use this:

https://github.com/amunters/bitx40-raduino-v2

73 Allard PE1NWL

On Wed, March 14, 2018 09:54, Ryan Flowers wrote:
Hello Everyone,

I've been working on my own digital VFO/BFO for my BITX40. The goal:
Switch sidebands without inverting the VFO to 19mhz for 40M and 26mhz for
20M. I've got it working, mostly, but I'm having one heck of a time with
audio quality. The 12mhz crystals not 12mhz but rather 11,984,800 and
currently I have my sidebands at 11994420 for USB and 11996450 for LSB.
These are 2030 and 4060hz away from the crystal frequency, and I am having
a hard time visualizing how that works. But at any rate, these are the
what I came up with mostly through trial and error. 

I'm currently using a modified version of the uBITX sketch. I've added the
offset frequency (11984800, named vfoOffset) and lsbCarrier and am using
the following to do my tuning:

if (isUSB){ si5351bx_setfreq(0, vfoOffset + frequency);
si5351bx_setfreq(1, usbCarrier); } else{ si5351bx_setfreq(0, vfoOffset +
frequency); si5351bx_setfreq(1, lsbCarrier); } I've also added menu items
for adjusting the USB/LSB and Offset easily, and using these I adjusted
for best inbound audio and ended up with the aforementioned values. When I
tune the radio to 7074mhz and select USB, I'm not getting *any* decodes on
FT8- but it works on LSB... What on earth? The other thing is that audio
output (as tested by transmitting into a dummy load and listening on my
Kenwood) is just terribly choppy and unintelligible. I've tried varying
the signal output strength of the si5351 clocks from 2ma to 8ma, no
difference. It sounds terribly over-modulated.

I have gotten in over my head, but I'm determined. Can somebody help me
understand this so I can not just complete this project but get a better
understanding? Thanks so much.

-- 
Ryan Flowers - W7RLF
MiscDotGeek.com ( http://miscdotgeek.com )
Multi Band BITX40 ( http://miscdotgeek.com/bitx40-digital-jt65/ )
The BITX40 FAQ ( http://miscdotgeek.com/unofficial-bitx40-faq )

Re: uBITX Software error messages #ubitx-help

bengt-ingvar.andersson@...
 

Now it works !

Thanks for all help.

SM6ERS/Ingvar

Re: #uBITX Firmware CEC Version Added WSPR function, I am looking for a beta tester. #ubitx

Ian Lee
 

Gerald

Thank you for testing wspr.
I checked your WSPR signal and checked that the frequency was relatively stable.

I will do a little more verification and release version 1.06 with WSPR functionality.
You do not have to update to version 1.06 if you do not have a lot of trouble using the firmware.

Thanks again for testing WSPR.
It was a great help to me.

Ian KD8CEC

2018-03-14 17:33 GMT+09:00 ge_clipboard <clipboard@...>:


Hello Ian

Made some test transmissions with the new version and, as you can see on wsprnet.org, the signals are heard all around from the uBitx on a 42m vertical delta loop. All settings left as per factory, no corrections anywhere.

Is it not possible to adjust the soundlevel by the software to control the output?

Many thanks and 73, Gerald - HB9CEY





--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: Carl's case

Carl Beck
 

Thank you Tom

Re: Complaint Department

Jerry Gaffke
 

As you see fit.  
Your project.
However,

Would be nice to somehow address errors in the "official" instructions in a timely way.
Otherwise it's up to the forum here to sort that stuff out.
Again and again and again. 

For example, the wireup page still has this:
  The 1N4007 has to be installed with reverse polarity. Its purpose is to conduct
  if you have supplied reverse voltage to the radio and burn itself out instead of the radio.

As has been pointed out here several times, that section of the wireup is incorrect.
When the diode blows, the next thing to go is the radio.
It might work if you have a big schottky diode and a fuse at the supply so the fuse can blow first, but no mention is made of a fuse.
A faulty reverse protection scheme is worse than none at all, as some people will assume it works.

And where does something like the WX TDA2822 get sorted out?
That should probably be in the wireup page, new information being put up
as it becomes available.

I'd prefer to see a link to a specific curated webpage of errata at the top of the hfsignals wireup page,
not just a website homepage, with appropriate disclaimers. 
Either that, or somebody at hfsignals has to be monitoring the forum closely and editing the information
in a timely manner.

Jerry, KE7ER


On Tue, Mar 13, 2018 at 10:52 pm, Ashhar Farhan wrote:
On thr hfsigs site, or anything else that I endorse or recommend, I never do that without having tried it myself. That is the unfortunate part of pursuing experimental methods. It is also good in that whatever mods are on hf, if any, they are robust.
There is the bitxhacks blog, the ubitx.net for the rest. 
I am going to put those links with the caveats on the ubitx page. Is that a good option?
This reminds me of a software piece that knith once wrote about : be careful with the abive code, i have only proved it to be correct, i havent tried it.
- f

Re: Digital BFO Mod: Terrible Audio! #bitx40help

Jerry Gaffke
 

Allard's v2 firmware is a good choice, this has all been done.
Though the understanding you get from trying to do it yourself is worth the time. 

The series resonant frequency of the crystals is a few khz lower than parallel resonance:
    https://groups.io/g/BITX20/message/25360

You don't describe how the audio is terrible. 
If when tuned for natural sounding speech, you get audio that has lots of bass or lots of treble, 
then it's likely you don't have the BFO frequency set correctly.
It is the distance of the BFO from the crystal filter passband that determines what audio frequencies are present.


On Wed, Mar 14, 2018 at 01:54 am, Ryan Flowers wrote:
The 12mhz crystals not 12mhz but rather 11,984,800 and currently I have my sidebands at 11994420 for USB and 11996450 for LSB.

Re: Complaint Department

Vince Vielhaber
 

And the speaker jack is STILL wired up to both the tip and ring. As has been pointed out, a mono plug plugged into it shorts the audio to ground.

Vince.

On 03/14/2018 11:15 AM, Jerry Gaffke via Groups.Io wrote:
As you see fit.
Your project.
However,

Would be nice to somehow address errors in the "official" instructions
in a timely way.
Otherwise it's up to the forum here to sort that stuff out.
Again and again and again.

For example, the wireup page still has this:
The 1N4007 has to be installed with reverse polarity. Its purpose is
to conduct
if you have supplied reverse voltage to the radio and burn itself out
instead of the radio.

As has been pointed out here several times, that section of the wireup
is incorrect.
When the diode blows, the next thing to go is the radio.
It might work if you have a big schottky diode and a fuse at the supply
so the fuse can blow first, but no mention is made of a fuse.
A faulty reverse protection scheme is worse than none at all, as some
people will assume it works.

And where does something like the WX TDA2822 get sorted out?
That should probably be in the wireup page, new information being put up
as it becomes available.

I'd prefer to see a link to a specific curated webpage of errata at the
top of the hfsignals wireup page,
not just a website homepage, with appropriate disclaimers.
Either that, or somebody at hfsignals has to be monitoring the forum
closely and editing the information
in a timely manner.

Jerry, KE7ER


On Tue, Mar 13, 2018 at 10:52 pm, Ashhar Farhan wrote:

On thr hfsigs site, or anything else that I endorse or recommend, I
never do that without having tried it myself. That is the
unfortunate part of pursuing experimental methods. It is also good
in that whatever mods are on hf, if any, they are robust.
There is the bitxhacks blog, the ubitx.net <http://ubitx.net> for
the rest.
I am going to put those links with the caveats on the ubitx page. Is
that a good option?
This reminds me of a software piece that knith once wrote about : be
careful with the abive code, i have only proved it to be correct, i
havent tried it.
- f