Date   

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


Fw: Xcvr's for sale

Jack, W8TEE
 

All:

All of the rigs/kits have been sold pending payment.

Jack, W8TEE



----- Forwarded Message -----

From: Jack Purdum <jjpurdum@...>
To: BITX20 <bitx20@groups.io>; QRPLabs <qrplabs@groups.io>; QRP ARCI Mailing List at groups.io <qrparci@groups.io>; Reply To Group <softwarecontrolledhamradio@groups.io>
Sent: Wednesday, January 6, 2021, 11:18:46 PM EST
Subject: Xcvr's for sale

All:

Time to thin the herd: For Sale (shipping is CONUS):

Kits And Parts Organic 40M 5 Watter in case, as shown in my Oct., 2019, CQ Magazine article. (Kit cost without case $50.) Assembled with Apache case: $55.00 + $13.00

CRKits HT-1 40M/20M 5W transceiver. Assembled in case. (Kit cost $150.) Assembled with case: $125.00 + $13.00

WA3RNC 5W, 40M, Quick kit with case (Cost: $150). Assembled with case: $100.00 + $10.00

Wilderness Radio Norcal 40A (Kit cost $129.00) Assembled with case: $100.00 + $13.00

Frog Sounds 3W, 40M xcvr (similar to Forty-9er), Kit unassembled $10.00 + $7.00

QCX CW 5W xcvr 40M kit, unassembled: $50.00 + $7.00

QCX CW 5W xcvr 20M kit, unassembled: $50.00 + $7.00

2NJ/2XX 40M 5W CW xcvr, unassembled with case (case still in wrapping paper): $90.00 + $13.00

BITX40 40M xcvr kit, Version 3, unassembled: $40.00 + $10.00

PayPal only; shipping is the second price for CONUS. If there is multiple interest in a radio, first Paypal payment paid to econjack AT yahoo.com gets it. Please be sure to send shipping address.

I'll let people know about the sale tomorrow, if there are any buyers.

Jack, W8TEE


--
Jack, W8TEE


Re: BITX20] FETs on sale

Bob Lunsford
 

Before reading your message, I kept looking at the spec sheet and could not see a Ft or something that gave an upper level frequency spec so began to wonder about it. However, some transistors were used for power supplies and for 40M QRP finals in the past so thought it might be usable. Oh, well...

Bob — KK5R

On Thursday, January 7, 2021, 11:00:55 AM EST, Jerry Gaffke via groups.io <jgaffke@...> wrote:


Great part, if you are building a power supply.
An RF amp, not so much.
IRF510  total gate charge:  8nC
IRF3205 total gate charge: 146nC

Those numbers were both taken at a Vgs of 10v, so should be a pretty fair comparison.

Jerry, KE7ER



On Thu, Jan 7, 2021 at 04:12 AM, Bob Lunsford wrote:

Saw these, may be of interest...
 

Pack of 10 - IRF3205 N Channel FET Transistor 55V
sale price $2.95

 
 


Re: Xcvr's for sale

Bill Lamm
 

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

73


Re: BITX20] FETs on sale

Jerry Gaffke
 

Great part, if you are building a power supply.
An RF amp, not so much.
IRF510  total gate charge:  8nC
IRF3205 total gate charge: 146nC

Those numbers were both taken at a Vgs of 10v, so should be a pretty fair comparison.

Jerry, KE7ER



On Thu, Jan 7, 2021 at 04:12 AM, Bob Lunsford wrote:

Saw these, may be of interest...
 

Pack of 10 - IRF3205 N Channel FET Transistor 55V
sale price $2.95

 
 


AGC KIT for Ubitx for sale

Johnny AC0BQ
 

Gm Group 
I bought this kit and never got around to installing it. 
Sold the radio first! 

It's the kit with the S meter from Ham Radio Hobby kits, 

Here is the link.


I will take $20.00 for it plus shipping of $5.00? 
I think it will ship in a padded envelope? 
US only unless you want to pay the additional shipping fee's??? 
Pay pal is ok 
72 
Johnny AC0BQ 


Re: Xcvr's for sale

Jack, W8TEE
 

You should have a refund in a few minutes.

Jack, W8TEE

On Thursday, January 7, 2021, 9:32:00 AM EST, Ted via groups.io <k3rta@...> wrote:


And I thought I got up early in the morning!   No worries.  Thanks. 

--
Jack, W8TEE


Re: Xcvr's for sale

Ted
 

And I thought I got up early in the morning!   No worries.  Thanks. 


Re: Xcvr's for sale

Jack, W8TEE
 

Mornin' Ted:

The Organic 5 Watter already sold. I'll refund your payment today.

Jack, W8TEE

On Thursday, January 7, 2021, 6:03:48 AM EST, Ted via groups.io <k3rta@...> wrote:


PayPal sent for Organic 5-watter.

--
Jack, W8TEE


Re: GPSDO ubitx ?

Rafael Diniz
 

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>> 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
 

Thanks Rubens. I just connected the 13.8V to the center, and the
negative to outer, and it is working fine!

Rafael

On 1/7/21 10:47 AM, Rubens Kamimura wrote:
Olá Rafael.

Melhor verificar antes de ligar. 
Verifique a continuidade para chassis (o negativo).
Uso uBITX v4, o meu tem três pinos, um dos lados é o negativo, o do
meio  +13,8Vcc ou Power TX, e o outro da extremidade é o +12Vcc.

--
73's PY2PVB

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


Em ter., 5 de jan. de 2021 às 20:28, Rafael Diniz
<rafael@rhizomatica.org <mailto:rafael@rhizomatica.org>> escreveu:

Hi there,

I bougth a ubitx v6 basic kit, and I'm wondering what to do with
the two
parts cut with the shape of the ubitx? It there a "case guide" on how
can I get my ubitx in a nice casing?

And btw, in the 12v jack, the positive is the center, and negative the
outer side of the jack, right?

Yay! I'll be on air soon.

Rafael PU2UIT








Re: unboxing the ubitx v6

Rubens Kamimura
 

Olá Rafael.

Melhor verificar antes de ligar. 
Verifique a continuidade para chassis (o negativo).
Uso uBITX v4, o meu tem três pinos, um dos lados é o negativo, o do meio  +13,8Vcc ou Power TX, e o outro da extremidade é o +12Vcc.

--
73's PY2PVB

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


Em ter., 5 de jan. de 2021 às 20:28, Rafael Diniz <rafael@...> escreveu:

Hi there,

I bougth a ubitx v6 basic kit, and I'm wondering what to do with the two
parts cut with the shape of the ubitx? It there a "case guide" on how
can I get my ubitx in a nice casing?

And btw, in the 12v jack, the positive is the center, and negative the
outer side of the jack, right?

Yay! I'll be on air soon.

Rafael PU2UIT








Re: unboxing the ubitx v6

Alessandrochiste@...
 

the rectangle shaped parts are 17.6 cm by 8.3cm (front and back panels),
and the distance between front and back is 17cm.
Thank you!

4341 - 4360 of 88595