Date   
Re: V5 uBitx CW issues

Ashhar Farhan
 

The ringing could be due to a race around the bidirectional amplifiers when for a brief moment, both directions are powered during transition from rx to tx.
- f

On Fri 12 Jul, 2019, 9:18 AM Dennis Yancey, <Kd4epg@...> wrote:
Thanks for the help folks. As always, you come through with great ideas. I will try these tomorrow.

--
72 and God bless
KD4EPG

Re: 2m under threat for Thales

Michael Walker
 

The big comment here is ...

What is every active ham today doing to reinforce how import 2M (144-146) to us?   

I bet the percentage of active ham's today use 2M much less then in the 90's.

Are you mentoring new hams and bringing them in?  Or, are you sitting in the sidelines saying it isn't my problem.

Some of you may be, but I bet  most aren't doing a thing?

When was the last time you had a 2M qso on FM?

Based on current usage Metrics I bet we don't have a leg to stand on.  Rest assured they did their homework on activity.  All you have to do is capture the IQ stream from an SDR receiver and write some scripts to watch for activity.  They could do this with a $25 RTL dongle.


Mike va3mw


On Fri, Jul 12, 2019 at 1:16 PM Dennis Beverage <Sodypop@...> wrote:
So it would appear that ARRL and the IARU are both paying close attention to this band allocation issue and that both favor retention of the band use for amature operators.  Since these two organizations are the pipeline for band allocation here in the USA I feel we ought to follow their lead.  I’m not sure about support organization in the EU, but it would appear that those bases are covered also.   Leadership in both zones is asking that we as individual operators funnel our support for 2m band retention through them, rather than creating our own special interest petitions.  JMO

sodypop
kj6vgb

Re: 2m under threat for Thales

Dennis Beverage
 

So it would appear that ARRL and the IARU are both paying close attention to this band allocation issue and that both favor retention of the band use for amature operators.  Since these two organizations are the pipeline for band allocation here in the USA I feel we ought to follow their lead.  I’m not sure about support organization in the EU, but it would appear that those bases are covered also.   Leadership in both zones is asking that we as individual operators funnel our support for 2m band retention through them, rather than creating our own special interest petitions.  JMO

sodypop
kj6vgb

Re: ce v1.2 on a ubitx v5

Nick Tile
 

For the benefit of Bill Lamm, I did say that it was an idiot mistake, and it was. The Nano is inverted in the socket compared to the way that they're usually connected so if you solder up a fresh Nano to use, you need to get it the right way up in respect of the pins ... doh !! I had had a very long day and was half asleep ...

Re: V5 uBitx CW issues

Don, ND6T
 

Since the path from tuner to ground becomes more significant at higher frequencies I have found that tuning the ground with a variable series LC circuit helps incredibly. Otherwise it is frequent that the wire from your tuner to actual outside ground is a quarter wave length and thus high impedance.
Fashion a simple LED RF indicator and touch it to the case of your radio. You might be surprised.
73, Don

Re: V5 uBitx CW issues

Evan Hand
 

I strongly believe that your issue is RF in the shack.  The Ferrite clip on worked for me.  When I got the ferrites, I bought an assortment, as I did not know what size exactly.  It also gave me the option to add more than one on a line/coax.

Here is what worked for me:
https://smile.amazon.com/gp/product/B0757H1SBZ/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

I am sure you can find them for less.  I tend to be lazy.

73
Evan
AC9TU

Re: V5 uBitx CW issues

 

Dennis,

Initially I had instability on the test bench with Bitx boards from HFsignals. I solved it by using
a 50 ohm shielded cable similar to RG174 and all issues went away.

I suggest that you cut the original 2 wire for antenna as short as possible (1/2") and
solder a thin coax or even a shielded wire till the BNC so that this piece does not radiate
inside the box.

My setup is not unstable even at high SWR of 4. This happened when my 40M dipole
dropped on the concrete roof when the tree that it was tied to fell in the storm.

Raj

At 12/07/2019, you wrote:
I took the antenna off and tested the uBitx straight into a 50 ohm dummy load and it performed flawlessly on the upper bands as well. I don't have ferrite beads I can use at the moment but will get some soon. This also gives me a reason to rework my ground system, as i have felt it has needed reworking for a bit.. will keep you informed as to progress.
Thanks again, everyone for your gracious thought and suggestions.

--
72 and God bless
KD4EPG

Re: V5 uBitx CW issues

Dennis Yancey
 

I took the antenna off and tested the uBitx straight into a 50 ohm dummy load and it performed flawlessly on the upper bands as well. I don't have ferrite beads I can use at the moment but will get some soon. This also gives me a reason to rework my ground system, as i have felt it has needed reworking for a bit.. will  keep you informed as to progress. 
Thanks again, everyone for your gracious thought and suggestions. 

--
72 and God bless
KD4EPG

Re: V5 uBitx CW issues

Dennis Yancey
 

Evan, 
Thanks for the info and suggestions. The uBitx is in a metal case designed for it, one of Sunhil's cases. I also use shielded wire between the key and the radio. I will run some tests with the dummy load and see and report back. Here is a new symptom, I took the radio off the 13.8 v power supply and put it on my battery, 11.8v fully charged. The issue subsided a great deal but the sidetone sounded really bad on 20 meters and let me fine tune the adjustment of SWR which cleaned up the sidetone a great deal. On the other bands going up, it was still doing the same thing..  I will keep posting my findings. 
Thanks,
 
-- 
72 and God bless
KD4EPG

Re: question about current after building the DC connector

Evan Hand
 

It might help us better understand your situation if you describe how the rig is built, especially how the power is wired.  Are you building from scratch, or using additional purchased components like a case with supplied power wiring boards (there are a number of them available)?  A picture of the power section of the build would also help.

73
Evan
AC9TU

Re: V5 uBitx CW issues

Evan Hand
 

Dennis,

The SWR reading will not be a true indication of RF on the coax shield or in the shack.  The problem could also be just stray RF in the shack. First of all verify that it is RF getting into the rig by transmitting into a dummy load as Curt suggested.  If the problem goes away, then it most likely is an RF issue getting back into the Raduino (actually the Nano in the Raduino) that controls the uBitx.

Based on your setup, I would first make sure you have proper ground on the rig and the tuner.  If that  doesn't solve the problem, then I would place the ferrite between the uBitx and the tuner.  I would also place a small ferrite on the key line.  For my uBitx I used shielded wire for the CW key line.

Is the rig mounted in a metal enclosure?  If not shielded, then adding copper foil and grounding to a plastic case might solve the issue. 

Just suggestions.  My case of the RF in the shack is a known issue with OCFD antennas.  Not sure on your setup. 

Please use the above ideas at your own risk.  It is very difficult for me to diagnose through descriptions.
73
Evan
AC9TU

Re: question about current after building the DC connector

 

Firstly I assume it is a V5 board.

0.5 mA means the power is not going to the board. Check if you are getting 12V at least at the board ground and any RX power points.
Start at the 3 pin power connector top. Then check on the board contacts below. Sometimes the connector wires which are crimped
may give some issues.

Raj

At 12/07/2019, you wrote:
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: 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.