Date   

Re: Transmit a continuous tone for PA adjustment

Gordon Gibby
 

If you set up high speed electronic keying of “dots”, you can obtain stable readings on analog scales, while reducing the dissipation of the final amplifier by 50%

People sometimes use this to protect expensive devices while tuning.


Gordon

On Jan 8, 2021, at 07:24, Rafael Diniz <rafael@rhizomatica.org> wrote:

Perfect, I just realized that, thanks!!

Rafael

On 1/8/21 12:15 AM, Ashhar Farhan wrote:
If you put the latest firmware into the ubitx, you can key cw by
holding down the mic ptt

On Fri 8 Jan, 2021, 8:25 AM Curt via groups.io <http://groups.io>,
<wb8yyy=yahoo.com@groups.io <mailto:yahoo.com@groups.io>> wrote:

Yes. With older vacuum tube transmitters we used a key to tune the
final amplifier. As Mark suggests, need to set menu for hand key,
as the paddle or keyer mode produces continuous dits or dahs instead.

I am remembering wsjtx software for ft8 has a tune function,
which gives a steady audio tone as Rubens suggested. Try all of these.

Curt






Re: Transmit a continuous tone for PA adjustment

Rafael Diniz
 

Perfect, I just realized that, thanks!!

Rafael

On 1/8/21 12:15 AM, Ashhar Farhan wrote:
If you put the latest firmware into the ubitx, you can key cw by
holding down the mic ptt

On Fri 8 Jan, 2021, 8:25 AM Curt via groups.io <http://groups.io>,
<wb8yyy=yahoo.com@groups.io <mailto:yahoo.com@groups.io>> wrote:

Yes. With older vacuum tube transmitters we used a key to tune the
final amplifier. As Mark suggests, need to set menu for hand key,
as the paddle or keyer mode produces continuous dits or dahs instead.

I am remembering wsjtx software for ft8 has a tune function, 
which gives a steady audio tone as Rubens suggested. Try all of these.

Curt


Re: Transmit a continuous tone for PA adjustment

Rubens Kamimura
 

Rafael, good morning.

You can select telegraph mode and select CW and close a wire (short circuit), for example.
Set the tone to 1kHz, or another value.
There is another way via the "PTT" button (normal open contact), I installed a micro switch on the uBITX v4 panel, for adjustments in TX mode.
As the JTDX (FT8) has a stable tone setting, I do this via CAT, that is, connecting a notebook and pressing the "TUNE" icon.
Any questions, I will be QAP / QRV.

73's de Rubens py2pvb
(GG49in07)
--

Rubens Kamimura
Técnico em Eletrônica e Eletrotécnica - Aposentado
CFT/CRT-SP: 80254934820
Cel. +55 (18) 9-9819-2225 WhatsApp


Em qui., 7 de jan. de 2021 às 17:44, Rafael Diniz <rafael@...> escreveu:

Hi all,

Is there any simple way (can be changing the firmware) to transmit a
continuous tone, in order I can use it to adjust a power amplifier (I
got a kit from aliexpress)?

Btw, any guide on how to use he CW over serial on the ubitx? I should
just put the radio in CW mode over CAT and then send key down and key up
for having CW on and off in the selected frequency?

Rafael PU2UIT










New ubitx v6 - No sound

Diego
 

Hello to the group:
I ordered and assembled my new v6 kit, but I can't hear some noise from the bands, no sound. 
I try with various headphones and nothing.
When I turn the volume pot sometimes I can hear a low digital sound like a helicopter propeller.
Any suggestions? I'm very new on radio electronics.

Thanks, 73's
Diego.


Re: Transmit a continuous tone for PA adjustment

Ashhar Farhan
 

If you put the latest firmware into the ubitx, you can key cw by holding down the mic ptt


On Fri 8 Jan, 2021, 8:25 AM Curt via groups.io, <wb8yyy=yahoo.com@groups.io> wrote:
Yes. With older vacuum tube transmitters we used a key to tune the final amplifier. As Mark suggests, need to set menu for hand key, as the paddle or keyer mode produces continuous dits or dahs instead.

I am remembering wsjtx software for ft8 has a tune function,  which gives a steady audio tone as Rubens suggested. Try all of these.

Curt


Re: Transmit a continuous tone for PA adjustment

Curt
 

Yes. With older vacuum tube transmitters we used a key to tune the final amplifier. As Mark suggests, need to set menu for hand key, as the paddle or keyer mode produces continuous dits or dahs instead.

I am remembering wsjtx software for ft8 has a tune function,  which gives a steady audio tone as Rubens suggested. Try all of these.

Curt


Re: Transmit a continuous tone for PA adjustment

Mark Erbaugh
 

Make sure to set the keyer type to Hand Key

73,
Mark, N8ME


Re: Transmit a continuous tone for PA adjustment

Rafael Diniz
 

If I just short-circuit the keyer input it will create a continuous
carrier output?

Rafael

On 1/7/21 6:50 PM, Curt via groups.io wrote:
Or connect a push button or switch to the cw input, either internal or
external. I can do it with a piece of wire.

Curt


Re: Transmit a continuous tone for PA adjustment

Curt
 

Or connect a push button or switch to the cw input, either internal or external. I can do it with a piece of wire.

Curt


Re: Transmit a continuous tone for PA adjustment

Rubens Kamimura
 

Hello everyone

I have been using FT8, with 1kHz tone in "TUNE" with uBITX v4, via CAT, for alignment.
--
73's PY2PVB



Em qui., 7 de jan. de 2021 às 17:44, Rafael Diniz <rafael@...> escreveu:

Hi all,

Is there any simple way (can be changing the firmware) to transmit a
continuous tone, in order I can use it to adjust a power amplifier (I
got a kit from aliexpress)?

Btw, any guide on how to use he CW over serial on the ubitx? I should
just put the radio in CW mode over CAT and then send key down and key up
for having CW on and off in the selected frequency?

Rafael PU2UIT










Transmit a continuous tone for PA adjustment

Rafael Diniz
 

Hi all,

Is there any simple way (can be changing the firmware) to transmit a
continuous tone, in order I can use it to adjust a power amplifier (I
got a kit from aliexpress)?

Btw, any guide on how to use he CW over serial on the ubitx? I should
just put the radio in CW mode over CAT and then send key down and key up
for having CW on and off in the selected frequency?

Rafael PU2UIT


Re: GPSDO ubitx ?

Rafael Diniz
 

Thanks Farhan, I'll buy the parts and give a try. As a computer
scientist, my soldering and electronic skills are a bit limited.

Rafael

On 1/7/21 5:37 PM, Ashhar Farhan wrote:
You will have to brew it. Program the gps module to output 10 mhz,
feed it through a 10 mhz filter and divide it by two using a flip
flop, now you get a stable 5 mhz signak, square wave.
Filter out the fifth harmonic and use that as the input to the si5351. 
It sounds complicated but it can be a single evening project

On Thu 7 Jan, 2021, 7:38 PM Rafael Diniz, <rafael@rhizomatica.org
<mailto:rafael@rhizomatica.org>> wrote:

Hi Ashhar,

Is there a way to know if the Si5351 correct got the 25 Mhz input?

I still did not do the 10 MHz to 25 MHz circuit (I bought a GPSDO with
10Mhz output from ebay). Any way I can buy a 10 MHz to 25 MHz
transverter already assembled?

Regards,
Rafael

On 11/19/20 12:48 AM, Ashhar Farhan wrote:
> I tried something a year ago or so. I was attempting to reduce the
> phase noise on Si5351 using an external oscillator instead of the
> internal oscillator.
> So, this is how it worked. 
> 1. You take a 10 MHz TCXO, (subsitute this with a GPS source for a
> GPSDO) and divide it by 2 in a 74HC74. The output is rich in
harmonics
> at 5 MHz.
> 2. You feed the 5 MHz square wave into a triple tuned bandpass
filter
> at 25 mhz to isolate the 5th harmonic. This will be weak, add an
> amplifier of 16 db to bring it up.
> 3. Feed this to the xin input of the Si5351.
> Now, your Si5351 is GPS disciplined.
>
> On Thu 19 Nov, 2020, 7:35 AM Rafael Diniz,
<rafael@rhizomatica.org <mailto:rafael@rhizomatica.org>
> <mailto:rafael@rhizomatica.org <mailto:rafael@rhizomatica.org>>>
wrote:
>
>     Very interesting Jason! Tks!
>
>     Rafael
>
>     On 11/17/20 10:47 AM, Jason Pirok wrote:
>     > I just bought one of the VFO/SigGen kits from QRP-Labs and
they
>     > already have a GPS disciplined option for it if you want
to try it
>     > out. It is only 1PPS but apparently does the job. I
haven't built my
>     > GPS kit yet so I can't give any personal details atm. You
have to
>     > provide the 5v supply on your own so that is some extra work.
>     >
>     > Just a thought in case you hadn't seen that project yet.
>     >
>
>
>
>
>
>







Re: GPSDO ubitx ?

Ashhar Farhan
 

You will have to brew it. Program the gps module to output 10 mhz, feed it through a 10 mhz filter and divide it by two using a flip flop, now you get a stable 5 mhz signak, square wave.
Filter out the fifth harmonic and use that as the input to the si5351. 
It sounds complicated but it can be a single evening project

On Thu 7 Jan, 2021, 7:38 PM Rafael Diniz, <rafael@...> wrote:
Hi Ashhar,

Is there a way to know if the Si5351 correct got the 25 Mhz input?

I still did not do the 10 MHz to 25 MHz circuit (I bought a GPSDO with
10Mhz output from ebay). Any way I can buy a 10 MHz to 25 MHz
transverter already assembled?

Regards,
Rafael

On 11/19/20 12:48 AM, Ashhar Farhan wrote:
> I tried something a year ago or so. I was attempting to reduce the
> phase noise on Si5351 using an external oscillator instead of the
> internal oscillator.
> So, this is how it worked. 
> 1. You take a 10 MHz TCXO, (subsitute this with a GPS source for a
> GPSDO) and divide it by 2 in a 74HC74. The output is rich in harmonics
> at 5 MHz.
> 2. You feed the 5 MHz square wave into a triple tuned bandpass filter
> at 25 mhz to isolate the 5th harmonic. This will be weak, add an
> amplifier of 16 db to bring it up.
> 3. Feed this to the xin input of the Si5351.
> Now, your Si5351 is GPS disciplined.
>
> On Thu 19 Nov, 2020, 7:35 AM Rafael Diniz, <rafael@...
> <mailto:rafael@...>> wrote:
>
>     Very interesting Jason! Tks!
>
>     Rafael
>
>     On 11/17/20 10:47 AM, Jason Pirok wrote:
>     > I just bought one of the VFO/SigGen kits from QRP-Labs and they
>     > already have a GPS disciplined option for it if you want to try it
>     > out. It is only 1PPS but apparently does the job. I haven't built my
>     > GPS kit yet so I can't give any personal details atm. You have to
>     > provide the 5v supply on your own so that is some extra work.
>     >
>     > Just a thought in case you hadn't seen that project yet.
>     >
>
>
>
>
>
>







Re: unboxing the ubitx v6

Rafael Diniz
 

Just a follow up, I committed to my ubitxv6 firmware fork to keep the
LPF_B enabled down to 4.5 MHz:
https://github.com/DigitalHERMES/ubitxv6

I added a Makefile also, for those who don't like the arduino IDE.

Rafael

On 1/6/21 8:35 AM, Evan Hand wrote:
On Tue, Jan 5, 2021 at 07:49 PM, Rafael Diniz wrote:

Btw, I noticed I get zero output on 6.9MHz, and full power on
7100. Why?

I believe it is due to this section of the v6.1 code where the low
pass filter is selected:

void setTXFilters_v5(unsigned long freq){
  
  if (freq > 21000000L){  // the default filter is with 35 MHz cut-off
    digitalWrite(TX_LPF_A, 0);
    digitalWrite(TX_LPF_B, 0);
    digitalWrite(TX_LPF_C, 0);
  }
  else if (freq >= 14000000L){ //thrown the KT1 relay on, the 30 MHz
LPF is bypassed and the 14-18 MHz LPF is allowd to go through
    digitalWrite(TX_LPF_A, 1);
    digitalWrite(TX_LPF_B, 0);
    digitalWrite(TX_LPF_C, 0);
  }
  else if (freq > 7000000L){
    digitalWrite(TX_LPF_A, 0);
    digitalWrite(TX_LPF_B, 1);
    digitalWrite(TX_LPF_C, 0);    
  }
  else {
    digitalWrite(TX_LPF_A, 0);
    digitalWrite(TX_LPF_B, 0);
    digitalWrite(TX_LPF_C, 1);    
  }
}

Note that there is a small bug in the above, as the 60/80 meter filter
will be selected if the frequency is set exactly at 7MHz.  Not sure
that anyone would run that close to the band edge, but it does mean
that taking any measurements you would want to be at least a few hertz
above 7MHz.  I would have made the compare >=.  The same is true for
15m (21MHz).

You need to also take into account the sidetone offset when testing
CW, as the actual carrier is shifted by the sidetone value.  Since I
do not have a v6 I am not sure how the CWL or CWU mode is handled. 
All of my uBITX have been converted to KD8CEC firmware.  To be safe,
the best bet is to set a test frequency of 1kHz or more above the
21MHz and 7MHz filter selection points.

73
Evan
AC9TU


Re: uBitx v6: Display flashing when switched on #v6 #ubitxv6

David VE2XPM
 

It is not a steady white , but regularly flashing.

I will add your suggestions to Mark's list!

73
David, VE2XPM


Re: uBitx v6: Display flashing when switched on #v6 #ubitxv6

David VE2XPM
 

Thanks for the suggestions ... Lots of possibilities there so I will give it a go this weekend!

73
David, VE2XPM


Ubitx and QO-100 sat

iz oos
 

Hello everybody and HNY,
Has anyone tried to operate QO-100 sat using a Ubitx? What a pity most operators in the US can't uplink that SAT!


Re: AGC KIT for Ubitx for sale

Johnny AC0BQ
 

Its sold to kg4rul 
Thanks Dennis. 
73 


Re: Xcvr's for sale

Bill Lamm
 

That saved me a fiddy 😉


Re: Xcvr's for sale

Jack, W8TEE
 

Sorry, Bill...everything's sold.

Jack, W8TEE

On Thursday, January 7, 2021, 11:32:28 AM EST, Bill Lamm <kd9mdl@...> wrote:


Did your BITX40 40M xcvr kit, Version 3, unassembled: $40.00 + $10.00 find a new home yet?!

73

--
Jack, W8TEE

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