Date   
Re: Variable power control

Roberto Vannucci
 


I want to suggest a circuit that I have tested to regulate the power in my previous self-built HF transmitter. It is based on an HSMP3816 QUAD PIN DIODE.
I enclose the circuit file 73 IK6BLO

2018-02-22 9:33 GMT+01:00 Walter <W9KJO@...>:

Thank you very much

That is a very nice schematic drawing and readable

Thank you,  I cant wait to get the parts and build it.

73, W9KJO, Walter


Re: Faulty K1 relay

Allard PE1NWL
 

I had exactly the same issue with my BitX40. Perhaps the supplied relays
are poor quality. I replaced the relay by:

brand: ZETTLER
type: AZ822-2C-12DE

http://www.conrad-electronic.co.uk/ce/en/product/507425/PCB-relays-12-Vdc-2-A-2-change-overs-Zettler-Electronics-AZ822-2C-12DE-1-pcs

When replacing the relays it's also a good idea to install standard 16 pin
DIL IC sockets. The relays fit in, so you can easily swap them should
they fail again.

73 Allard PE1NWL

On Thu, February 22, 2018 11:21, Glenn wrote:
For anybody trying to get their uBITX to work in Tx mode. Something to
check perhaps.

Mine was working then started to become intermittent. Key the Mic PTT
switch and the display shows it's in Tx mode, but no power out.

Tracing signals etc, I found that the K1 changeover relay was not
switching 12V to the Tx section. I could hear the relay 'operate' but it
didn't actually switch.

Replaced the relay and all is fine.

glenn
vk3pe

Re: Using external amp with µBitx

David S
 

Raj / Richie

That's odd, the orange wire on my Ubitx is the input to the audio amp, the wire colours and positions on the socket is the same as in the wire-up but the orange wire definitely goes to the TDA2822 pin 7, there's also a C78 connected to pin 7 that's not on the schematic.  The (full) audio feed is on the yellow wire, an oscilloscope confirms this. The orange wire need a DC path to ground for the TDA2822 to function correctly.  It seems there's an error on the wire-up drawing.

Regards

Davis S  G8DJM

Faulty K1 relay

Glenn
 

For anybody trying to get their uBITX to work in Tx mode. Something to check perhaps.

Mine was working then started to become intermittent. Key the Mic PTT switch and the display shows it's in Tx mode, but no power out.

Tracing signals etc, I found that the K1 changeover relay was not switching 12V to the Tx section. I could hear the relay 'operate' but it didn't actually switch.

Replaced the relay and all is fine.

glenn
vk3pe

Re: Erratic Tuning bitx40!

Jodannastreet1985@...
 

Ok I measured voltage and getting 0.9v from fully anti clockwise to fully clockwise. There is continuity from the center pin to ground... 

Raduino V1.01 is what flashes up momentarily when turning on. 

Re: Variable power control

Walter
 

Thank you very much

That is a very nice schematic drawing and readable

Thank you,  I cant wait to get the parts and build it.

73, W9KJO, Walter

Re: rv2- messed up setting and txing like mad!!!

Alan -MMØWXT
 

On Wed, Feb 21, 2018 at 07:43 pm, Raj vu2zap wrote:
Alan,

You had zero'd the RV1. Please bring it back to center and leave it there and forget it exists.
Check on a loud hallow with RV1 centered. If RV1 is fully clockwise then your output will be zero
due to no drive from RV1.

Raj

At 22/02/2018, you wrote:
Hi Jerry.
No effect on amps moving RV1.
100ma each on adjustment of RV1&2 whilst pressing PTT on mic
PA,Brown, supply 200 ma on PTT
12v,red, rail 250 in receive 550ma tx

A loud hallllow produces no change in current. Dont have swr so no idea of output to load.

But receive working and things are a beginning to click.

Thanks

Alan

 Gentlemen. You are wonderful!
Ubitx is alive. Low amps on PTT was mis wired Baofeng Mic.

Followed another thread and croc clipped the cw connector and grounded it for dit. Got 1.53A!!!

Still to try on Phone.

I have had a very good lesson. But more importantly I have learned a lot about the ubitx.

I cannot thank you ALL enough.

Thank you and 73's

Alan

Re: Using external amp with µBitx

 

Richie,

The only thing I can think of is that after disconnecting the ORANGE wire, you are taking output from the top of the volume control.
The audio signal is coming from the ORANGE wire. So from the volume control you will not hear anything!

You could leave the ORANGE wire alone and disconnect the YELLOW wire from the pot and take output from the center of the
volume control and that volume control will work for your external amp.

Raj

At 22/02/2018, you wrote:
I have run into an issue with taking the pre-amp audio signal from Q70 and using it with an external amplifier. When I remove VOL-H (Orange wire) from the top of the volume pot and run to another amplifier, I get nothing. I have a scratch-built Bitx v3 that I have used the low-level output to run an LM-380 with no issues, so I know it's not a level mis-match. I don't understand why the TDA2822 can "hear" the audio but nothing else I have can. Has anyone else modded their audio section?

Re: RD16HHF1 in the uBITX #ubitx

MVS Sarma
 

Allison,
Thanks for the very useful and detailed information on your implementation of IRF devices.

regards
 sarma
 vu3zmv

Regards
MVS Sarma
 

On Thu, Feb 22, 2018 at 9:43 AM, K9HZ <bill@...> wrote:
I would not argue with you on using IRF510s...  i simply choose to use real RF transistors because they typically have better characteristics for RF design work eg flatter capacitance curve vs frequency so no need for compensation tricks. I do question the 2N3904 claim though as they are easily good (flat gain) to 200+ MHz in a properly designed circuit.  Could it be that the rest of the circuit is actually the problematic part... like the stage coupling capacitors?


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 Feb 21, 2018, at 5:19 PM, ajparent1 <kb1gmx@...> wrote:

There seems to be a belief that the IRF5xx parts have no capability at VHF...

I have an amp using 8 of them at 32V that puts out a mere 210W at 50mhz.  All of the parts are
IRF510s in a 4x4 push pull arrangement!  The amps gain over all is about 13db. 

I have also built the WA2eby push-pull HF amp and that design with 2w in gives me 55W at 40M
and 37W at 29mhz, that with a 28V supply.   Also IRF510s so the part has capability though
generally if performs better at 24V.

THe bias on the IRF510 is often lower than optimum, Both amps (and other HF/6M projects)
run far more bias current that specified as it produced more power.

The problem is the amplifier has matching issues from simplified transformers.  Additionally 
at 30mhz the AC  gain of the driver and predriver transistors (2n3904) is about 10 as compared
to an AC gain of 20 at 14mhz. So you seeing two problem one of driver that diminishes with
frequency and matching that is less than optimum with increasing frequency. 

I've also built amps around the RD16HHF part and at 13V its good but it requires different
components around it to get the power out they can deliver.  For a push pull pair with adequate
drive 20W is about it.

Before I'd go for changing parts I'd insure the driver and predriver are producing enough power.
It is also possible that the particular parts are on the low sid eof spec but the design is robust enough
to absorb that.

Another thing to insure is that your DC [pwer getting to the final is really 12-14V and not suffering
excessive voltage drop due to wiring  or worse the power source fading at higher currents.

So dropping in RD16HHF1 in without changes will likely not improve matters much and it may
lead to instability.   But if you have a pair you can try. 

I'd expect more like 4W or more so something is not right.


Allison/kb1gmx


Re: RD16HHF1 in the uBITX #ubitx

K9HZ <bill@...>
 

I would not argue with you on using IRF510s...  i simply choose to use real RF transistors because they typically have better characteristics for RF design work eg flatter capacitance curve vs frequency so no need for compensation tricks. I do question the 2N3904 claim though as they are easily good (flat gain) to 200+ MHz in a properly designed circuit.  Could it be that the rest of the circuit is actually the problematic part... like the stage coupling capacitors?


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 Feb 21, 2018, at 5:19 PM, ajparent1 <kb1gmx@...> wrote:

There seems to be a belief that the IRF5xx parts have no capability at VHF...

I have an amp using 8 of them at 32V that puts out a mere 210W at 50mhz.  All of the parts are
IRF510s in a 4x4 push pull arrangement!  The amps gain over all is about 13db. 

I have also built the WA2eby push-pull HF amp and that design with 2w in gives me 55W at 40M
and 37W at 29mhz, that with a 28V supply.   Also IRF510s so the part has capability though
generally if performs better at 24V.

THe bias on the IRF510 is often lower than optimum, Both amps (and other HF/6M projects)
run far more bias current that specified as it produced more power.

The problem is the amplifier has matching issues from simplified transformers.  Additionally 
at 30mhz the AC  gain of the driver and predriver transistors (2n3904) is about 10 as compared
to an AC gain of 20 at 14mhz. So you seeing two problem one of driver that diminishes with
frequency and matching that is less than optimum with increasing frequency. 

I've also built amps around the RD16HHF part and at 13V its good but it requires different
components around it to get the power out they can deliver.  For a push pull pair with adequate
drive 20W is about it.

Before I'd go for changing parts I'd insure the driver and predriver are producing enough power.
It is also possible that the particular parts are on the low sid eof spec but the design is robust enough
to absorb that.

Another thing to insure is that your DC [pwer getting to the final is really 12-14V and not suffering
excessive voltage drop due to wiring  or worse the power source fading at higher currents.

So dropping in RD16HHF1 in without changes will likely not improve matters much and it may
lead to instability.   But if you have a pair you can try. 

I'd expect more like 4W or more so something is not right.


Allison/kb1gmx

Using external amp with µBitx

Richie Chambless
 

I have run into an issue with taking the pre-amp audio signal from Q70 and using it with an external amplifier. When I remove VOL-H (Orange wire) from the top of the volume pot and run to another amplifier, I get nothing. I have a scratch-built Bitx v3 that I have used the low-level output to run an LM-380 with no issues, so I know it's not a level mis-match. I don't understand why the TDA2822 can "hear" the audio but nothing else I have can. Has anyone else modded their audio section?   

Re: rv2- messed up setting and txing like mad!!!

 

Alan,

You had zero'd the RV1. Please bring it back to center and leave it there and forget it exists.
Check on a loud hallow with RV1 centered. If RV1 is fully clockwise then your output will be zero
due to no drive from RV1.

Raj

At 22/02/2018, you wrote:
Hi Jerry.
No effect on amps moving RV1.
100ma each on adjustment of RV1&2 whilst pressing PTT on mic
PA,Brown, supply 200 ma on PTT
12v,red, rail 250 in receive 550ma tx

A loud hallllow produces no change in current. Dont have swr so no idea of output to load.

But receive working and things are a beginning to click.

Thanks

Alan

Re: Erratic Tuning bitx40!

 

I have noticed that this happens when the center pin is disconnected.

Raj


At 21/02/2018, you wrote:
The voltage from the wiper pin (middle) of the tuning pot is read by an analog pin on the Nano
to determine tuning.  Measure the voltage from that pin to ground using a DVM, it should vary
smoothly from 0 volts with the pot fully counterclockwise to 5 volts when fully clockwise.

There is no "reset" that might cause this. 
If it worked before, then perhaps the wires from the pot got shorted or something.
The "something" means I have absolutely no idea, perhaps elves updated the firmware while you were sleeping?

Jerry


On Wed, Feb 21, 2018 at 05:07 am, <M0clscarl@...> wrote:
Hi, my bitx40 has decided to start tuning erraticly! It will tune itself in 10khz steps to the very top of the band or the bottom. And if its not doing that then it is jumping and tuning all over the place! One thing I have also noticed is that when first turning the radio on, the Radino with version number displays, it never used to? So Im wondering if something has reset? Any ideas please?

Re: uBITx shipping and all

walt hodges
 

what is your paypal address?

On Wed, Feb 21, 2018 at 1:26 AM, Lawrence Galea <9h1avlaw@...> wrote:
Disgusting Scrooges and Grinches
Most authorities these days would make you pay to breathe.


On Wed, Feb 21, 2018 at 7:03 AM, K9HZ <bill@...> wrote:

 

So I’m a big proponent of getting younger people involved in ham radio and to that end, I support the YOTA (youth on the air) initiative.  To that end I like donating time and radios to that cause, and what better first radio for a young ham than a nice new uBITx.  So in December, I ordered five uBITx transceivers to give away to young people on the island of St. Lucia (J6) where I have a retirement villa and nice radio station.  I work with another Ham on the island to bring in equipment that is difficult for hams to get there.  Well this week those five uBITx radios arrived and were stuck in customs until my friend there retrieved them.  The issue was, though, even though these radios were gifts for kids for learning… the St. Lucian government charged my friend $551 US Dollars today as import tax on those “FREE” radios.  Incredible.  I’ll have to make this right with him, but it’s getting harder and harder in today’s world to help people that need it.

 

 

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

Like us on Facebook! facebook icon

 

Moderator – North American QRO Yahoo Group.

 

email:  bill@...

 

 


Virus-free. www.avg.com



Re: #ubitx Calibration resolution #ubitx

Ian Lee
 

Jack

I changed it to 1.03 and push it to github.

The modified parts are shown below.

//=================================================
Line Number : 1152, 1154 in ubitx_menu.ino

void menuSetupCarrier(int btn){

    if (knob > 0)
      usbCarrier -= 5;
    else if (knob < 0)
      usbCarrier += 5;
    else
      continue; //don't update the frequency or the display

//=================================================


Ian KD8CEC


2018-02-22 11:12 GMT+09:00 Jack Purdum via Groups.Io <jjpurdum@...>:

Was that section in the code what changed it?

Jack, W8TEE



From: Joel Caulkins <caulktel@...>
To: BITX20@groups.io
Sent: Wednesday, February 21, 2018 5:54 PM
Subject: Re: [BITX20] #ubitx Calibration resolution

I finally got my uBitx calibrated to my satisfaction but I still think there is room for some improvement there. Now waiting for my case to arrive and I can finish it up. So far very happy with it.

Joel
N6ALT




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

Re: More pins for the Raduino! An RF gain control for the uBITX!

VE7WQ <v@...>
 

Thank you Dexter,


it's getting better and better all the time. 

I'll delay my shopping for a while :)


73! George

VE7WQ


Wednesday, February 21, 2018, you wrote:

DNM> All above, plus ease of procurement: 20 x 1000 parallel = 50 ohms, 20 x

DNM> 1/2 = 10 Watts. Matrix 4x5 for least lead length.

Re: KD8CEC V1.02 CW Frequency TX Adjust on LCD #ubitx

Ian Lee
 

masa

Thanks for your suggestion.
Your code work perfectly.

I have been able to set the CW frequency more easily since applying your code.

I added your code to CEC Firmware.
In CW Mode, fixed code is applied by default.
uBITX Manager was used to enable the previous frequency display method.

The modified source can be found at https://github.com/phdlee/ubitx.

Ian KD8CEC

//Load Configuration =======================================

  //Adjust CW Mode Freq
  shiftDisplayAdjustVal = (isShiftDisplayCWFreq & 0x3F) * 10;

  //check Minus
  if ((isShiftDisplayCWFreq & 0x40) == 0x40)
    shiftDisplayAdjustVal = shiftDisplayAdjustVal * -1;

 //Shift Display Check (Default : 0)
  if ((isShiftDisplayCWFreq & 0x80) == 0)  //Enabled
    isShiftDisplayCWFreq = 1;
  else    //Disabled
    isShiftDisplayCWFreq = 0;


//Applied Your code
    if (vfoActive == VFO_A) // VFO A is active
      strcat(c, "A:");
    else
      strcat(c, "B:");
  }

  //Fixed by Mitani Massaru (JE4SMQ)
  if (isShiftDisplayCWFreq == 1)
  {
    if (cwMode == 1)        //CWL
        tmpFreq = tmpFreq - sideTone + shiftDisplayAdjustVal;
    else if (cwMode == 2)   //CWU
        tmpFreq = tmpFreq + sideTone + shiftDisplayAdjustVal;
  }
  






2018-02-21 0:59 GMT+09:00 Mitani Masaru <mitani.masaru@...>:

ubitx KD8CEC Firmware (and others) Transmits on CW, LCD Frequency shifts Sidetone Frequency.
It fix patch for V1.02.

On ubitx_ui
 Set mode name(CWL/CWU) after Frequency plus(USB) or minus(LSB) to sidetone frequency.
100Hz shift needs  critical tune for my ubitx.
This modify goes  just LCD  Frequency Transmits on CW Oparation.
SSB mode is no change Frequency shift.

JE4SMQ masa





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

Re: rv2- messed up setting and txing like mad!!!

Alan -MMØWXT
 

Hi Jerry.
No effect on amps moving RV1.
100ma each on adjustment of RV1&2 whilst pressing PTT on mic
PA,Brown, supply 200 ma on PTT
12v,red, rail 250 in receive 550ma tx

A loud hallllow produces no change in current. Dont have swr so no idea of output to load.

But receive working and things are a beginning to click.

Thanks

Alan



Should i be seeing circa 1.8 amps on voice modulation and PTT? 13.8v psu

Re: More pins for the Raduino! An RF gain control for the uBITX!

Dexter N Muir
 

All above, plus ease of procurement: 20 x 1000 parallel = 50 ohms, 20 x 1/2 = 10 Watts. Matrix 4x5 for least lead length.

Re: RD16HHF1 in the uBITX #ubitx

Gordon Gibby <ggibby@...>
 

I found them for about $200 at did you key. The 300 W version was only $72. Those are pretty competitive prices to vacuum tubes!

On Feb 21, 2018, at 19:31, Michael Shreeve <@N6GRG> wrote:

MRFE6VP61K25H/HS