Date   
Re: Inexpensive eBay Amplifier Kits

iz oos
 

Right Joe, if you need many of them you end up paying more. And the ones I mentioned, rated at 300w, might not even needed for that amp. However if some have some ferrous toroids (say red, yellow or white) in the drawer buying just the mica caps may make nice filters based on a good and simple design.


Il 16/mag/2019 15:51, "Joe Puma" <kd2nfc@...> ha scritto:
Iz, is it because the LPF is multiband while these filters you posted are mono band. If you add up all that mono band filters you will spend more on those then the eBay multiband band one. :)

Joe 
KD2NFC 



On May 16, 2019, at 3:09 AM, iz oos <and2oosiz2@...> wrote:

http://www.communication-concepts.com/fl1-15/

Re: Inexpensive eBay Amplifier Kits

Joe Puma
 

Iz, is it because the LPF is multiband while these filters you posted are mono band. If you add up all that mono band filters you will spend more on those then the eBay multiband band one. :)

Joe 
KD2NFC 



On May 16, 2019, at 3:09 AM, iz oos <and2oosiz2@...> wrote:

http://www.communication-concepts.com/fl1-15/

Re: Inexpensive eBay Amplifier Kits

iz oos
 

I am in the opinion that a LPF like that at 50usd is overpriced. Toroids seem small, what about the capacitors? Are these ceramic or silver-mica, rated at what voltages? You may have a look to http://www.communication-concepts.com/fl1-15/,  the manuals are instructive.


Il 16/mag/2019 04:09, "Joe Puma" <kd2nfc@...> ha scritto:
Hey Curt,

So I got the amp assembled but without a filter. Tests look good into a dummy load. On a antenna for just a brief keyup my turner couldn’t keep the swr low at all. It kept tuning. Any thoughts? I read that blog where he mentioned a resistor change to get better swr and make the amp more stable. I’m sure not having a filter is playing a role here too. 

Joe
Kd2nfc 



On May 14, 2019, at 7:36 PM, Joe Puma via Groups.Io <kd2nfc@...> wrote:

Thanks Curt. Okay that’s the filter I was going to get as well. I also saw the blog where the blog suggested to increase bias voltage. I am also waiting for a similar sized heatsink too, next will be a case for the filter and amp. 


Joe




On May 14, 2019, at 4:08 PM, Curt M. <Kc3hjp@...> wrote:

Hi Joe, 

The filter set that Oliver has listed above is the one that I am using.  They used to be $50 or so which in my opinion was overpriced especially compared to what they are now.  I mounted mine filters in an aluminum enclosure with a switch on the front to select the individual bands.  Be sure to get yourself a fan to mount on the side of the heatsink.  Tehy ahve convienently pit a connector on the board to power the fan.

Here is an old picture of mine while I was still in the testing stages and before I mounted the fan on the side.  There is a heatsink and fan available on ebay that fits the board perfectly.  I also made a PTT cable up for when I use it with the FT-817ND.

Curt M.

<FullSizeRender.jpg>

Original Bitx20 design

N7QL
 

I was going to build the Bitx20 3b but I have been mulling over the original design. Would it produce bad results to build the original design? I ask because I have most of what I'd need for that design. My intention is to build it in modules so I can experiment. That said I don't want to run afoul of best amateur practice or anything. Please let me know if it's a stupid idea. Thanks.

Re: treble only SSB modulation

iz oos
 

Do not use receivers that have an antenna connected. Remove the whip of the degen if possible. Transmit into a 50ohm dummy load and not to the antenna for these tests.


Il 15/mag/2019 21:48, <laurent.bury@...> ha scritto:

Hello,

thank you all for your excellent replies: I'm going to make the BFO calibration procedure, and listening by myself on my good old DEGEN 1103 chines receiver.

And yes, I was surprised at first by the too higly pitched received modulation: it is a good second facts that leads to a BFO calibration problem.

I will let you know!

All in all this uBitx is a great transceiver for the price, and for many like me a chance to transmit with something else but commercial hardware.

And many thanks again for great support.

Best 73's.
--
Laurent F5FIE.


Re: Inexpensive eBay Amplifier Kits

Joe Puma
 

Hey Curt,

So I got the amp assembled but without a filter. Tests look good into a dummy load. On a antenna for just a brief keyup my turner couldn’t keep the swr low at all. It kept tuning. Any thoughts? I read that blog where he mentioned a resistor change to get better swr and make the amp more stable. I’m sure not having a filter is playing a role here too. 

Joe
Kd2nfc 



On May 14, 2019, at 7:36 PM, Joe Puma via Groups.Io <kd2nfc@...> wrote:

Thanks Curt. Okay that’s the filter I was going to get as well. I also saw the blog where the blog suggested to increase bias voltage. I am also waiting for a similar sized heatsink too, next will be a case for the filter and amp. 


Joe




On May 14, 2019, at 4:08 PM, Curt M. <Kc3hjp@...> wrote:

Hi Joe, 

The filter set that Oliver has listed above is the one that I am using.  They used to be $50 or so which in my opinion was overpriced especially compared to what they are now.  I mounted mine filters in an aluminum enclosure with a switch on the front to select the individual bands.  Be sure to get yourself a fan to mount on the side of the heatsink.  Tehy ahve convienently pit a connector on the board to power the fan.

Here is an old picture of mine while I was still in the testing stages and before I mounted the fan on the side.  There is a heatsink and fan available on ebay that fits the board perfectly.  I also made a PTT cable up for when I use it with the FT-817ND.

Curt M.

<FullSizeRender.jpg>

Re: #ubitx #ubitx-help #ubitx #ubitx-help

Jonathan Fritz <va3jfz@...>
 

Hey Curt,

I’m feeding the ubitx with a cheap lab bench power supply. It’s intended more for electronics hobbyists than for ham radio, so it’s entirely possible that it is not a clean power source. 

Unfortunately, I don’t have a scope with which to confirm this theory. I’ll ask around my local club and see if I can either borrow a scope or another low wattage HF unit with which to try the PS. 

In the mean time, I’ve managed to upgrade the firmware on the ubitx and will go through the calibration routine that you recommended, and then report back. 

Jonathan Fritz
VA3 JFZ 

On May 15, 2019, at 2:32 PM, Curt via Groups.Io <wb8yyy@...> wrote:

Jon

maybe I should have asked what kind of power supply you are using -- a battery or something 'intended' for ham radio use?  a PC type power supply might garble things pretty well (it depends). 

the ubitx gets its local oscillator from a crystal source, being a very nice (but inexpensive) PLL.  about the only way to easily mess it up is to feed it cruddy power. 

while its possible it is less likely that something on the board has gone bad.  if one or more capacitors were damaged enough to completely break them) - something could be distorted.  but I would expect obvious physical damage. 

CW is harder to distort with a bad BFO setting - if you can hear it there should be a place to tune it in - unless BFO is so far off that it is coming in way down the skirt of the crystal filter. 

okay if you power supply is clean (such as other rigs are happy with it) - then I would investigate your BFO setting. 

Curt

Re: separate CAT jack, without using the USB cable #ubitx #cat #raduino #arduino

Sascha Bohnet | DL5SMB
 

So once again I made some progress. I have not located the exact cause of the end of the transmission yet, but I am sure the problem lies within the fake AM mode of the uBITX:

So, i used my USB to TTL-Adapter to spy on the communication between the Loop Controller and the uBITX on both lines, RX and TX,
and could not find anything unusual in the commands.

No that's actually not correct:

In fact I noticed that the uBITX switched back to RX even before the loop controller had sent the command to do so.
You could see these also by watching the commands on the computer monitor and the power output of the swr-meter.
The timing just did not fit as it should have.

Otherwise the commands were actually okay - as well as the loop controllers answers:

I did some serial.printing here and made it give out  the measured forward and reflected  power, the calculated power and the VSWR.
Until here everything was okay.

Then I made it print the value of the Progess variable - before and after a new value should have been assigned:

      trx_set_am_mode();              // AM mode
      delayloop(50);
      if (radio.pwr_available) trx_set_min_pwr();  // Set Minimal power
      delayloop(50);
      trx_set_tx();                   // TX mode
      delayloop(250);                 // Give time for Power to come up
      measure_power_and_swr();        // Ensure we have one measurement available
       Serial.print("FWD:");
       Serial.println(fwd_power_mw/1000);
       Serial.print("REF:");
       Serial.println(ref_power_mw/1000);
       Serial.print(" PWR ");
       Serial.print(power_mw/1000);
       Serial.print(" SWR ");
       Serial.println(measured_swr);
       myState = tune.Progress;    // myState ends up with the value 0 or 1
       Serial.println("alter Fortschritt");  //old progress
       Serial.println(myState); 
      progress = SUCCESS;       // Setup for Autotune is initiated
      myState = tune.Progress;    // myState ends up with the value 0 or 1
      Serial.println("neuer Fortschritt");  //new progress
       Serial.println(myState); 

It turned out the variable  does not get updated. I did then another round of serial printting withing the SWR-HUNT function,
in the section where the output power was checked again - and voilà, not power anymore.

    // FAIL - Not enough Transmit Power to determine SWR
    else
    {
      tune.Prepare = false;                     // Clean up for next time
      tune.Progress = NOPWR;
      Serial.println(ref_power_mw); // tested forwared AND reflected power here
      Serial.println(MIN_PWR_FOR_SWR_CALC); // minimum output power to do the calculation
      Serial.println("shit"); // abort due to no power

https://ibb.co/ZGJBbPF

https://ibb.co/cDGMNb6

Sorry for the german language within the screen shots.

So the loop controller just sends the commands:

0000000003 (report frequency and mode)

0400000007 (change mode to AM)
0000000008 (start TX)
0000000088 (end TX)
0000000007 (change mode to LSB)

The uBITX answers with 8 zeros

00000000

I did again some reverse engineering within the uBitx code (changed out "0"  to "1" in the Serial.prints) and found out that the change mode command as well as ther start
and stop tx commands are always answered with "00" by the uBITX So four times "00" makes 8 zeros. Nothing unusual here.

Then I came to coclusion that the next reasonable thing was to turn off the loop controller and just use the uBITX cat control with the PC,
triggering AM mode and TX via PTT.

I did this then with Ham Radio Deluxe and noticed that HRD always switched back to CW after switching to AM.
Of course, the uBITX did react to the "get into AM" command, but if asked what mode it was in, it still answered with CW.

So i modeified the uBITX code a bit to make it also send back the AM identifier within the cat_libs.

void CatGetFreqMode(unsigned long freq) //for remove warning messages
{
  int i;
  byte tmpValue;
  unsigned BCD_LEN = 9;

  if (BCD_LEN & 1) {
    CAT_BUFF[BCD_LEN / 2] &= 0x0f;
    CAT_BUFF[BCD_LEN / 2] |= (freq % 10) << 4;
    freq /= 10;
  }
  for (i = (BCD_LEN / 2) - 1; i >= 0; i--) {
    tmpValue = freq % 10;
    freq /= 10;
    tmpValue |= (freq % 10) << 4;
    freq /= 10;
    CAT_BUFF[i] = tmpValue;
  }

  //Mode Check
  if (cwMode == 0)
  {
    if (isUSB)
      CAT_BUFF[4] = CAT_MODE_USB;
    else
      CAT_BUFF[4] = CAT_MODE_LSB;
  }
  else if ((cwMode == 1)&&(isAM == 0))
  {
      CAT_BUFF[4] = CAT_MODE_CW;
  }
  else
  {
      CAT_BUFF[4] = CAT_MODE_CW;
  }
  if ((cwMode == 1)&&(isAM == 1)) // else davor?
  {
      CAT_BUFF[4] = CAT_MODE_AM;
  }
  SendCatData(5);
}

This did the trick and HRD stayed on AM after having it set to AM.

So I finally was able to try to make it switch to TX on AM:

The result was the same as with controlling the uBITX with the loop controller.

TX starts and when it is about half a second in transmitting, it switches back to RX. Also the sidetone is still in function
and does not get turned off, though I have the "keyup()" command on two locations.

Once in the CatSetPTT()  (which did never work at all)

void CatSetPTT(boolean isPTTOn, byte fromType) //inTx==1 bei Sendebetrieb, egal ob cw, ptt oder cat
{
  //
  if ((!inTx) && (fromType == 2 || fromType == 3)) { //fromType normal : 0, TX : 1, CW_STRAIGHT : 2, CW_PADDLE : 3, CW_AUTOMODE : 4
    Serial.write(ACK);  //already checked
    return; 
  }
 
  // Set PTT Mode
  if (isPTTOn) // isPttOn = indirect logic: Ptt=1 means RX
  {
    if (!inTx)
    {
      txCAT = true; // if TX due to CAT
              if (isAM == 0)
              {
                    startTx(TX_SSB, 1);
              }
              else  {startTx(TX_CW, 1);
                    cwKeydown();
                    }
      //Exit menu, Memory Keyer... ETC
      if (isCWAutoMode > 0) {
                              isCWAutoMode = 0;
                              printLineF2(F("AutoKey Exit/CAT"));
                             //delay_background(1000, 0);
                             }
    }
  }
 
  else // if already in TX miode
  {
    if (inTx)
    {
      cwKeyUp();// is not working
      stopTx();
      txCAT = false;
    }
  }


and once in the CATSetMode() (which worked with the loop controller)

As the CatSetMode is not triggered with HRD ( where just  the TX-Mode gets stopped) I strongly suspect that the problem
is caused by a function / condition within the ubitx firmware, which collides with the fake AM mode.

I also assume it is related to the CAT-Code as the TX-mode is not aborted if I use my external CW-KEY (aka skrewdriver)
to make the rig send.

I did try to find this condition, but was unsuccesful. I also could imagine, that this is a programming gap as normally the cw key
is not controlled via cat. Could this be possible?

I first thought that it must work as you John are using it with your antenna tuner - but then i remembered having read somewhere,
your CW-Signal is generated not with the CW but the SSB clock?

I would be glad if anyone had an idea what to do.

This was a long post now (which surely could have been a lot shorter if focused on the results of the experiments),
but I wanted to write down how i came to these results / conclusions. Maybe I did not interpret everything correctly.

Sascha

Re: treble only SSB modulation

Adrian Chadd
 

Hi!

I highly recommend doing it using a sound card microphone input. That
way you can adjust the passband using something like fldigi to monitor
the noise floor in the passband.


-adrian

On Wed, 15 May 2019 at 12:48, <laurent.bury@...> wrote:

Hello,

thank you all for your excellent replies: I'm going to make the BFO calibration procedure, and listening by myself on my good old DEGEN 1103 chines receiver.

And yes, I was surprised at first by the too higly pitched received modulation: it is a good second facts that leads to a BFO calibration problem.

I will let you know!

All in all this uBitx is a great transceiver for the price, and for many like me a chance to transmit with something else but commercial hardware.

And many thanks again for great support.

Best 73's.
--
Laurent F5FIE.

Re: treble only SSB modulation

laurent.bury@...
 

Hello,

thank you all for your excellent replies: I'm going to make the BFO calibration procedure, and listening by myself on my good old DEGEN 1103 chines receiver.

And yes, I was surprised at first by the too higly pitched received modulation: it is a good second facts that leads to a BFO calibration problem.

I will let you know!

All in all this uBitx is a great transceiver for the price, and for many like me a chance to transmit with something else but commercial hardware.

And many thanks again for great support.

Best 73's.
--
Laurent F5FIE.

Re: #ubitx #ubitx-help #ubitx #ubitx-help

Curt
 

Jon

maybe I should have asked what kind of power supply you are using -- a battery or something 'intended' for ham radio use?  a PC type power supply might garble things pretty well (it depends). 

the ubitx gets its local oscillator from a crystal source, being a very nice (but inexpensive) PLL.  about the only way to easily mess it up is to feed it cruddy power. 

while its possible it is less likely that something on the board has gone bad.  if one or more capacitors were damaged enough to completely break them) - something could be distorted.  but I would expect obvious physical damage. 

CW is harder to distort with a bad BFO setting - if you can hear it there should be a place to tune it in - unless BFO is so far off that it is coming in way down the skirt of the crystal filter. 

okay if you power supply is clean (such as other rigs are happy with it) - then I would investigate your BFO setting. 

Curt

Re: Inexpensive eBay Amplifier Kits

EI4GNB
 

I got the single chip 80w/100w (depending on voltage) version on Aliexpress. https://www.aliexpress.com/item/new-MINIPA-DIY-KITS-100W-SSB-linear-HF-Power-Amplifier-For-YAESU-FT-817-KX3-heastink/32845684822.html NO instructions whatsoever, it differed slightly from the pics in the listing, the chip was not new.. Aside from that, it works fine. Plenty of stuff on the web detailing builds of these style boards, so You can average them all out and get the build done without making a splatterbox if You use Your head. Mine had much of the construction already done - i think they build the boards up to a stage where they can have components added to the bag depending on what version has been ordered. You can see how it will support a pair of transistors in PP, or the single ceramic i got etc.

Works well enough with ft817 and uBitx, when driven gently for digital modes using the on-board loop for a LPF. It's response to drive is not in any way linear, it appears to be not working, then takes off when You pass a threshold, so if You are testing one, jack up the drive very slowly.

Mine was advertised at the time as working on 6m, i found this was not the case.

Keeping things in the spirit of the uBitx, this is a good addition IMHO, just be prepared to suck up any lack of support or gaps in reality, and have a plan about a filter for this version, as this is clearly going to make You very unpopular without one.

Re: treble only SSB modulation

bill wright
 

it is your BFO calibration.  There is a you tube to watch
73 kd5yyk

On Tuesday, May 14, 2019, 3:41:10 PM CDT, <laurent.bury@...> wrote:


Hi there uBitx owners,

today a ham confirmed me that my modulation was only in the treble part of the audio spectrum: no bass and (that the most annoying) no medium frequencies to hear...

I wonder  if this a known and common problem, although I was not able to find something related while browsing the group's messages.

For information, I just use the electret mike as delivered with my V3 board.

Any comments ?

73s
--
Laurent F5FIE.

Re: Flrig and uBitX not connecting

Vic WA4THR
 

I had downloaded Flrig from the W1HKJ site, version 1.3.44, when I was trying to use it. I've deleted it from the computer now as it did not work.

Is anyone else using Flrig?

=Vic=

Re: How to stop worrying and love the uBitx #ft8 #cat #antennas #ubitx

Tom, wb6b
 

Hi,

Good things come to procrastinators... This KV4QB site has a lot of interesting Ham related microprocessor projects. Including adding a TFT display to a uBitx. And a cool simulated analog meter using a small OLED display. 

He has a project for a 63 db step attenuator using eBay attenuator modules. I recently bought two to do the same thing. And when that day comes I have some spare time I was going to hash together some kind of Arduino code to control them. Right there on his site is code to do just that. Maybe if I stay busy with client projects, my soldering iron will build the thing for me (Maybe like Disney's Fantasia. Although I seem to remember things went terribly wrong when inanimate objects were set off to do work). Well, maybe, procrastination won't be rewarded at that level.

http://kv4qb.blogspot.com/2019/04/63-db-step-attenuator.html

Tom, wb6b

Re: How to stop worrying and love the uBitx #ft8 #cat #antennas #ubitx

Gerry Kavanagh
 

Hi Vince, Wayne... It's based on work done by DuWayne KV4QB - http://kv4qb.blogspot.com/search?q=power+dummy
I have a few spare boards if you are interested...
/ Gerry

Re: Look at this on eBay, ubitx, budget test equipment.

Jim G4GNO
 

I bought one of these signal generators (FY6600) about a year ago. It can do everything I require for HF and is accurate enough for my needs. It has a lot more functions than I expect I will ever use seriously. it is quite entertaining playing around with it  though if you have a scope available.  I am a  bit on the careless side (see bin of dead Arduino nano's by my bench) and have not managed to damage it yet.  On the not so good side the screen is a bit small but the PC application that you can download for it solves that. A couple of locks ups requiring a re-start and thats about it. Cant go far wrong at the price I think. 
Jim

Re: treble only SSB modulation

iz oos
 

You may like to hear your modulation yourself with another receiver. You transmit into a dummy load and you receive without any antenna. I have ver. 3 and has no basses, say lower than 500hz. Listening to my SDR receiver I like my modulation a lot! Excellent for dx. I had generally excellent reports. However I trust more of what I hear myself than the reports by others. Not always their carrier is yours, they might have strange settings in filters, pbt etc


Il 14/mag/2019 22:41, <laurent.bury@...> ha scritto:

Hi there uBitx owners,

today a ham confirmed me that my modulation was only in the treble part of the audio spectrum: no bass and (that the most annoying) no medium frequencies to hear...

I wonder  if this a known and common problem, although I was not able to find something related while browsing the group's messages.

For information, I just use the electret mike as delivered with my V3 board.

Any comments ?

73s
--
Laurent F5FIE.

Re: #ubitx #ubitx-help #ubitx #ubitx-help

va3jfz@...
 

Hey Curt,

This past weekend, I was able to receive some distant phone and CW signals with none of the garbling that I heard this evening. Unfortunately, this evening, everything sounded garbled to me, even things that my friendly neighbourhood test subject was not transmitting. I'll try to work through your calibration guide.

Thanks,

Jon


On Tue, 14 May 2019 at 21:05, Curt via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Sounds quite cool to me!

3 blocks is dreadfully close. How do more distant signals sound? Receivers do overload when signals are huge.

Possibly also your ubitx may need the bfo adjusted. See my most recent message for a link to a calibration guide.

Take care and enjoy the radio building experience. Look around this site and see my stumbles if you wish. Meanwhile you have a cool rig to experience.

Curt

Re: #ubitx #ubitx-help #ubitx #ubitx-help

Curt
 

Sounds quite cool to me!

3 blocks is dreadfully close. How do more distant signals sound? Receivers do overload when signals are huge.

Possibly also your ubitx may need the bfo adjusted. See my most recent message for a link to a calibration guide.

Take care and enjoy the radio building experience. Look around this site and see my stumbles if you wish. Meanwhile you have a cool rig to experience.

Curt