Date   
Re: V5 uBitx CW issues

Dennis Yancey
 

Thanks for the help folks. As always, you come through with great ideas. I will try these tomorrow.

--
72 and God bless
KD4EPG

Re: V5 uBitx CW issues

Dennis Yancey
 

Using ladder line from random wire antenna to the tuner. Tunes perfect 1.1 to 1 SWR, where would I put the ferrite? in the coac between the tuner and the radio? Or between the tuner and the meter? This antenna setup works fin with other radios up to 125 watts.. that is the biggest I have.. 

--
72 and God bless
KD4EPG

Re: V5 uBitx CW issues

Evan Hand
 

I would agree with Curt.  I have run into this issue when I had RF on the shield from an OCFD (off center feed dipole).  Solved it with snap on ferrite on the coax both at the entrance to the shack and at the output of the SWR/PWR meter that I keep in line.   Solved it for me.

73
Evan
AC9TU

Re: ce v1.2 on a ubitx v5

Evan Hand
 

The other option is to install a voltage dropping resistor in series with the input to the 5 vdc 7805 regulator as well as adding the heat sink (with thermal compound).  I added 2 - 2 ohm 2 watt resistors in series (4 ohms 4 watts total).  That dropped the heat of the regulator significantly.  I then tested a 5 ohm 10 watt resistor on the 5vdc output side while running the rig.  There was a slight drop in voltage, less than .2 volts, and no impact to the the rig performance.  The regulator will get very hot with 1+ amp, though not into thermal overload. My estimated total current draw was 1.15 amps for this test.

Still, the best solution is to run separate regulators, as that way you have less dependency on input voltage.  With the voltage dropping resistor, under heavy load, the input voltage needs to be above 11 volts into the rig.  This drops as the 5 volt current drops.  The regulator needs at least 7 volts in to perform correctly,  All this is in the 7805 data sheet.

Above is my experience.  YMMV
Evan
AC9TU

Re: V5 uBitx CW issues

Curt
 

Dennis

Sounds maybe like RF feedback. If you have or can make a dummy load that would confirm it. Or dial back transmit power to see if that cures it. If you have only one antenna I am suspicious.

God bless you and yours.

Curt

Re: question about current after building the DC connector

Gary Anderson
 

On Thu, Jul 11, 2019 at 11:31 AM, KD2QMZ wrote:
On your statement number 2, it will not show the total current coming to the board, but the current the board is drawing
Same difference: "current being drawn" or "going to."  Kirchoff's 1st law.

V5 uBitx CW issues

Dennis Yancey
 

I have a V5 uBitx with CEC v 1.22 firmware and using a straight key. It works great on everything from 40 meters and below, however on all bands from 20 meters to 10 meters, when I press the key,  it locks in transmit and you have to push the TX stop button or power off to reset the radio. Any ideas?
--
72 and God bless
KD4EPG

Re: question about current after building the DC connector

nomadg360@...
 

Thanks for the reply.  Yes, little sloppy with my language there -- I should have said, "current being drawn", not "going to."   It is still the case, that the reading I got there was about .5 ma, actually more like .47ma.

I suspect that I am missing something assumed in the instructions.  I have connected power to the board before I have done any of the other build steps.  That seem to be what the "Wire-up" doc says.  But likely it assumes that I have done something more than just soldered the DC connector.  Anyway onward and see what happens when I do some of the other steps.

Re: question about current after building the DC connector

KD2QMZ
 

On your statement number 2, it will not show the total current coming to the board, but the current the board is drawing. For example, I got a 30 amps power supply, but the radio when not transmitting and on, it will measure at input the total voltage, but only the current is drawing.

On transmitting, then it will put few more amps, until mike is release or stop transmitting.



On Thu, Jul 11, 2019 at 1:44 PM <nomadg360@...> wrote:
Not sure my earlier reply got logged.

1. Not sure what you mean by switched on.  I had my power supply hooked up to the board, 13.5 volts, and could see that voltage at the DC connector pins.

2. I tried to measure the current by putting the meter on the incoming positive lead, i.e., connected in series on the positive lead from the power supply.  Seems that should have given me total current going to the board.

3. When you say "Are you measuring on center pin . . .," not sure what you mean.  Since both the brown and red are soldered to the center pin how would I connect the meter to read just what goes to the brown wire and where would I be connecting the other lead to get a current read?

4.  I am doing just the initial "out-of-the-box," install, so just the first step, soldering up the DC connector and connecting to power supply.

Re: question about current after building the DC connector

nomadg360@...
 

Not sure my earlier reply got logged.

1. Not sure what you mean by switched on.  I had my power supply hooked up to the board, 13.5 volts, and could see that voltage at the DC connector pins.

2. I tried to measure the current by putting the meter on the incoming positive lead, i.e., connected in series on the positive lead from the power supply.  Seems that should have given me total current going to the board.

3. When you say "Are you measuring on center pin . . .," not sure what you mean.  Since both the brown and red are soldered to the center pin how would I connect the meter to read just what goes to the brown wire and where would I be connecting the other lead to get a current read?

4.  I am doing just the initial "out-of-the-box," install, so just the first step, soldering up the DC connector and connecting to power supply.

Re: uBITX V3 for sale

Mike Wilson
 

Hi Balsun,

I will look into the shipping costs, and get back to you.

73s
VE3WMJ
Mike 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Balasubramanyan Cp <bsnvu2yc73s@...>
Sent: July 9, 2019 5:28 AM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITX V3 for sale
 
OM Mike,
Please let me know if I face shipping charges, you can send the shown items to me to Kerala, INDIA address?
If so in toto how much $ I have to send to you?
Please reply to my email address bsnvu2yc73s@...
73s VU2UYC Balsun

On Fri, Apr 12, 2019 at 3:31 AM <ve3wmj@...> wrote:
I have a uBITX version 3 board for sale. It is complete, and has not been modified. It includes a Nextion 3.2" display, a 12v 5a power supply, an additional 5v regulator board that can be used to power the 3.2 inch display, and an additional 10k pot with a knob.
Everthing you see in the picture below is included. I did not complete building the kit, but did do enough to power it up and test it on receive. You will need to swap the wires on the encoder as I have it wired backwards.
I am asking $120 US plus shipping. Will ship to Canada or USA.
Email me at my call sign at hotmail.com for more info.

Mike
VE3WMJ 

Re: ce v1.2 on a ubitx v5

Ian Reeve
 

In my ubitx I have a 3.5" Nextion display and find the onboard 5v regulator with a finned Heatsink manages OK.Gets warm but not too hot to touch,a external chassis mounted 5v regulator would be a better option,just remember to fit filter ceramic caps on input and output. 



From: BITX20@groups.io <BITX20@groups.io> on behalf of Bill Lamm <kd9mdl@...>
Sent: Thursday, July 11, 2019 3:15:08 PM
To: BITX20@groups.io
Subject: Re: [BITX20] ce v1.2 on a ubitx v5
 
Do share for the next guy with same problem :-)

Re: ce v1.2 on a ubitx v5

Bill Lamm
 

Do share for the next guy with same problem :-)

Re: question about current after building the DC connector

 

You need to be more specific.

Have you switched it ON ? Looks like it not!

Are you measuring on the center pin (Should be Brown) of power supply connector which goes to TX finals or the wire that goes to the
rest of the circuit (Should be Red) ?

The center pin on the board will show no current while in RX mode.

Raj

At 11/07/2019, you wrote:
All the documentation I have seen says you should bet around 100 MA of current when you first connect the power connector to the board. I am seeming about .50 MA Is this a problem?

Re: question about current after building the DC connector

d balfour
 

.5ma?

Re: Is there Nextion 5" firmware for Basic LCD NOT Enhanced?

John Ferguson (G8STW)
 

question about current after building the DC connector

nomadg360@...
 

All the documentation I have seen says you should bet around 100 MA of current when you first connect the power connector to the board.  I am seeming about .50 MA   Is this a problem?

Re: kit-projects.com AGC Question - Missing C3?

KE2GKB
 

As long as you have wired up the switch per our diagrams you are good! The switch in the off position has the pad grounded. And fast and slow have different resistances. So if your not using the S-Meter just leave it floating as its already handled via the switch :)

73

-- Tim Keller - KE2GKB https://shop.kit-projects.com

Re: kit-projects.com AGC Question - Missing C3?

Ted
 

"Looking at the picture it appears that you have not attached the switch. Without a discharge path from the common (S meter, AGC voltage) to ground then C6 will remain charged and the attenuating transistors will be actively reducing your signal. IMHO.
Sorry about not catching this thread earlier, Jerry. I was replying to the emails.
73,
Don"

So if I'm not using the s-meter output of this AGC board, should I ground that tab or use a specific level of resistance rather than leave it open?



73,
Ted

Re: WSTX/Cat control after multiple attempts frequency Red 0.000.000

Mark Hatch
 

Doug,

Good suggestion. Haven't seen the error in last 12 hours since I changed Split operation to None in WSJT. Although I am using Log40M and it likes to know that VFO, it really doesn't have too... (That is the reason for the use of Omnirig, but could also create a virtual port too.)

73
Mark