Date   
Re: Menu Sequence for CEC Firmware v1.200 #ubitx #firmware

John (vk2eta)
 

Glad you got it to work Dan.

That's the beauty of the rig, being able to customize it to your application.

Just a question, why not load the latest software on your V3 rig (maybe you made some modifications of the firmware)?

73, John

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-he llp #ubitx-he #ubitx

Jerry Gaffke
 

K3 could be just fine.

With power off, the relays are in their receive position as shown the the schematic.
The antenna is grounded for your DC ohmmeter by way of T2, via L4,3,2,1, K1 and K2

As per my previous post, my guess is that when you power up it immediately goes into transmit mode.
Now the antenna is grounded by way of T11, via KA1,2,3, L11,12,13 and K3.
In either case, all of TP1, TP2, TP8 and the antenna are DC grounded.
That would be true of a perfectly functioning rig, except it should not power up in transmit mode.

I'm guessing a miswire or two in following the hfsignals ubitx wireup instructions.
Perhaps in that 4.7k resistor that should be on the morse key line.
And perhaps also somehow in how the mike got wired up, such that plugging in the mike
somehow brings it back to receive.
 


On Sun, Apr 21, 2019 at 11:15 AM, Jens Kaemmerer wrote:
Also:

with the uBitx turned on *or* off:
continuity exists between TP8 (TX path) and ANT (antenna center conductor)
and TP1/TP2 and ANT

This is strange - based on the schematic it should be:

Either there is continuity between TP1/TP2 and ANT *or* TP8 and ANT - not
simultaneously.

My conclusion:
Maybe the relay K3 is damaged (or somehow 'stuck').

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-he llp #ubitx-he #ubitx

Adrian Chadd
 

Hi,

If you disconnect the raduino and power up, does it still go into TX mode? (Just to rule out something on the raduino side holding the TX line high.)



-adrian

Re: 18000km

knightsbdh@...
 

Hi Ron

Fascinating and well done. I am still in the process of setting up my uBitx (got to tick off some other projects first), so it's always interesting to read about what this little thing can do.

Cheers
Ben
ZS6BDK

Re: Raduino reinforcement, 3d printed

Tom Clifton
 

3D printing has become a home closet industry.  Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.  All you need to do is provide the .stl file.  Prices may be all over the ballpark so don't be surprised at the answers.  Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)  3D printing is not fast...

Another thing to consider is going down the 3D rabbit hole.  An Ender3 is under $200, and filament is $20 per Kg roll of PLA+

I finally took the leap a month ago and wonder why I waited so long.  I found a local (to me) Facebook Group for support.  Yes there is a bit of a learning curve, but once you get familiar with operation and the tons of .stl models available (free!) on thingiverse you will probably want to start creating your own models.  There are a number of free modeling packages with different capabilities (learning curve) but youtube is loaded with excellent tutorials.

Re: 18000km

_Dave_ K0MBT
 

10000 miles Excellent. I got a ssb contact with a Australian ham on phone a couple of weeks ago.

I wonder if the yahoos with amps are still going to be going strong when the bands come back.

Re: 18000km

Laurence Oberman
 

Yep, with CW or JT65 (with error correction) you can do a lot with a
very little.
Great job
Congrats

On Mon, Apr 22, 2019 at 8:22 AM d balfour <davesters@...> wrote:

10000 miles Excellent. I got a ssb contact with a Australian ham on phone a couple of weeks ago.

I wonder if the yahoos with amps are still going to be going strong when the bands come back.


Re: Raduino reinforcement, 3d printed

Ted
 

A couple of the public libraries around me have 3D printing ability listed as services available at nominal cost. 

I have yet to try them though I have 2 TFT bezels to obtain sooner or later.  You might see if your local public library system hosts this capability as well 


Ted
K3RTA



Re: Raduino reinforcement, 3d printed

Terry Morris
 

Thanks for this information Tom.

Terry - KB8AMZ
Brimfield Twp, OH USA EN91hd
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Mon, Apr 22, 2019 at 7:58 AM Tom Clifton via Groups.Io <kc0vsj=yahoo.com@groups.io> wrote:
3D printing has become a home closet industry.  Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.  All you need to do is provide the .stl file.  Prices may be all over the ballpark so don't be surprised at the answers.  Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)  3D printing is not fast...

Another thing to consider is going down the 3D rabbit hole.  An Ender3 is under $200, and filament is $20 per Kg roll of PLA+

I finally took the leap a month ago and wonder why I waited so long.  I found a local (to me) Facebook Group for support.  Yes there is a bit of a learning curve, but once you get familiar with operation and the tons of .stl models available (free!) on thingiverse you will probably want to start creating your own models.  There are a number of free modeling packages with different capabilities (learning curve) but youtube is loaded with excellent tutorials.

Re: Raduino reinforcement, 3d printed

Jim Sheldon
 

Tom's absolutely right about the 3D rabbit hole.  Be careful if you do though, These buggers can be extremely addictive!  Fortunately I have family support (my wife likes the Rose & Stem (stole it from Thingiverse) I printed for her shortly after she bought me one for my recent birthday.  It had a rather small print volume though (4.9" cube) so I spent another $217 on an Ender 3 with the glass (non-warping) bed as a second printer for the bigger stuff.

I don't have any black filament right now or I would have volunteered to print that for you.  Also they same guy that sells the little AGC board does them too and since he's doing them commercially and graciously sent me the .stl file I didn't want to encroach on his business.

Jim - W0EB

------ Original Message ------
From: "Terry Morris" <terry.kb8amz@...>
Sent: 4/22/2019 8:48:07 AM
Subject: Re: [BITX20] Raduino reinforcement, 3d printed

Thanks for this information Tom.

Terry - KB8AMZ
Brimfield Twp, OH USA EN91hd
Linux User# 412308, Ubuntu User# 34905, PCARS#78, NAQCC#6668, QRP-ARCI#8855, SKCC#14195


On Mon, Apr 22, 2019 at 7:58 AM Tom Clifton via Groups.Io <kc0vsj=yahoo.com@groups.io> wrote:
3D printing has become a home closet industry.  Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.  All you need to do is provide the .stl file.  Prices may be all over the ballpark so don't be surprised at the answers.  Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)  3D printing is not fast...

Another thing to consider is going down the 3D rabbit hole.  An Ender3 is under $200, and filament is $20 per Kg roll of PLA+

I finally took the leap a month ago and wonder why I waited so long.  I found a local (to me) Facebook Group for support.  Yes there is a bit of a learning curve, but once you get familiar with operation and the tons of .stl models available (free!) on thingiverse you will probably want to start creating your own models.  There are a number of free modeling packages with different capabilities (learning curve) but youtube is loaded with excellent tutorials.

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

 

The electrical path both will show 0 to ground  as they are connected to it through
inductors or toroids to ground.

TP1 is ground connected through a toroid.


At 21-04-19, you wrote:
Hi Jerry,

I have now been able to start with the 'noise injection' test:

I first connected the wire to TP21 and could hear noise increase
(VOL set to high). This was not much of a surprise because I
had already established that the LM386 is working.

Then I connected the wire to TP20 (output of the de-modulator?)
and found that I could not hear any difference in noise level.

If I read the uBitx v5 schematic correctly, this could mean that
the Q70 transistor (type 2N3904) or the relay K3 might be damaged.
I assume Q70 acts as an audio pre-amplifier(?).

I continued by measuring continuity between C51 (M1) and TP21 (M2)

with the uBitx turned off: continuity exists (expected)
with the uBitx turned on: continuity does not exist (?) (not expected)

I expected that continuity continues to exist when the uBitx is
turned on.

Also:

with the uBitx turned on *or* off:
continuity exists between TP8 (TX path) and ANT (antenna center conductor)
and TP1/TP2 and ANT

This is strange - based on the schematic it should be:

Either there is continuity between TP1/TP2 and ANT *or* TP8 and ANT - not
simultaneously.

My conclusion:
Maybe the relay K3 is damaged (or somehow 'stuck').

I was almost ready to send this email when I tried one more thing ...

I noticed in the past that a relay in the uBitx rapidly switches back and forth
when I startup the radio *and* have the  MIC cable (coming from the
soundcard) already plugged in.

So I figured, if the relay is 'stuck' - maybe I can 'free' it by plugging
the MIC cable in again and force the rapid back and forth switching.

Bingo - it worked, RX is working again.

Next up: fixing TX ... (don't have time for this today as this will require some surgery ...)

I am very thankful for everybodies help in this endeavor,

-jens (KM6ZJV)

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Philip
 

Is the cat alright.
Philip.

lsb/usb

Raymond House
 

Hi all, my V5 ubitx wont switch side bands on RX, the display says it does but in fact it makes no difference on a RX signal. It does switch side bands on TX. any ideas? Thanks.

Re: lsb/usb

Adrian Chadd
 

yes, it's a bug in the firmware. It doesn't reprogram the VFO until you change the frequency or transmit.

Here's my pull request against the upstream v4 tree that fixes this and another bug. the diff should apply cleanly against the v5 tree too as they're so similar.



On Mon, 22 Apr 2019 at 09:49, Raymond House <raymondh40@...> wrote:
Hi all, my V5 ubitx wont switch side bands on RX, the display says it does but in fact it makes no difference on a RX signal. It does switch side bands on TX. any ideas? Thanks.

Re: lsb/usb

Raymond House
 

Thanks Adrian, but I have a big problem with that, I  know nothing about programming It seems simple in the git-hub link you supplied but it's way beyond my  capabilities. I don't know what to do with that and at my age I don't feel like getting bogged down in something that will no doubt require a lot of time. I can handle a download that would set everything right but that's about it.


On Mon, Apr 22, 2019 at 1:05 PM Adrian Chadd <adrian@...> wrote:
yes, it's a bug in the firmware. It doesn't reprogram the VFO until you change the frequency or transmit.

Here's my pull request against the upstream v4 tree that fixes this and another bug. the diff should apply cleanly against the v5 tree too as they're so similar.



On Mon, 22 Apr 2019 at 09:49, Raymond House <raymondh40@...> wrote:
Hi all, my V5 ubitx wont switch side bands on RX, the display says it does but in fact it makes no difference on a RX signal. It does switch side bands on TX. any ideas? Thanks.

Re: lsb/usb

Adrian Chadd
 

hi!

ok. lemme go see if I can publish an image and send ashar an update for the v5 board.

-a


On Mon, 22 Apr 2019 at 10:23, Raymond House <raymondh40@...> wrote:
Thanks Adrian, but I have a big problem with that, I  know nothing about programming It seems simple in the git-hub link you supplied but it's way beyond my  capabilities. I don't know what to do with that and at my age I don't feel like getting bogged down in something that will no doubt require a lot of time. I can handle a download that would set everything right but that's about it.

On Mon, Apr 22, 2019 at 1:05 PM Adrian Chadd <adrian@...> wrote:
yes, it's a bug in the firmware. It doesn't reprogram the VFO until you change the frequency or transmit.

Here's my pull request against the upstream v4 tree that fixes this and another bug. the diff should apply cleanly against the v5 tree too as they're so similar.



On Mon, 22 Apr 2019 at 09:49, Raymond House <raymondh40@...> wrote:
Hi all, my V5 ubitx wont switch side bands on RX, the display says it does but in fact it makes no difference on a RX signal. It does switch side bands on TX. any ideas? Thanks.

Re: Audio AVC

Ted
 

Jerry,

Yes, that's the RF preamp.  What really happened is that I just wanted a hot receiver, plain and simple. No excuse, no glory, just that I wanted to pick up almost anything on a string of wire for demo purposes or for field use.  Regardless of reason for it, the perception of attack and decay seem to be controlled by the traditional AGC board output (that is, the S-Meter output), as it would be after all since the traditional AGC is just before the radio's front end stuff. 

To simplify: If the latter's initial reaction to a heap of a signal were to show a high S-meter reading [had I been using the S-meter output to run an S-meter], then the former (the preamp) is going to be put on speed brake to lower what gets sent past it; I'd assume that the latter (the AGC) will immediately perceive less signal shoved into its face and will relax at whatever normal, preset recovery has been programmed.  I don't see the two fighting against each other, so, there is that bit of success.

As to which ND6T circuit i have, I've got a kit version sent to me by the same fellow who solld me a V3 board near the end of winter this year, and, I've got an SMD version right from the maker's.  Both of my uBitx radios are using this preamp/AGC combo, one with the home-wired AGC and t'other with the ready-made SMD board.  It just so happens that when a strong signal comes rolling in over a weak one, two devices are getting instruction to reduce flow. My addition partially shorts out the RX path, while the normal or ND6T type AGC "fails to pass" as much signal as it did a moment earlier. The result is the same either way, and, I'm doing both (once each in two radios) and it's fine.  Overkill, but doing fine....

Here's the hook-up, simple enough:


At first - when I had the preamp and no AGC controller at all, I did use a 386-based amp board from somewhere or another to provide the control signal.  This setup seems to only needs about 0.7v on the gate of the 2N7000 to make at least some difference; at about .8-.9v, incoming gain is subjectively reduced to just under unity/without preamp levels and at around 1.2v on the gate the radio is deaf as a post.  If operating with another AGC, it's fine that way; operating without one, I expect that I'd want the 386 back  so that the RF preamp would function better as a one-piece combination.

Re: lsb/usb

Adrian Chadd
 

Hi,

ok. I've pushed in a pull request against the v5 firmware.


I'll see if I can build a separate image with this fix in it for you. I haven't actually published a binary image to flash before; I write software. :-)


-a


On Mon, 22 Apr 2019 at 10:26, Adrian Chadd <adrian@...> wrote:
hi!

ok. lemme go see if I can publish an image and send ashar an update for the v5 board.

-a


On Mon, 22 Apr 2019 at 10:23, Raymond House <raymondh40@...> wrote:
Thanks Adrian, but I have a big problem with that, I  know nothing about programming It seems simple in the git-hub link you supplied but it's way beyond my  capabilities. I don't know what to do with that and at my age I don't feel like getting bogged down in something that will no doubt require a lot of time. I can handle a download that would set everything right but that's about it.

On Mon, Apr 22, 2019 at 1:05 PM Adrian Chadd <adrian@...> wrote:
yes, it's a bug in the firmware. It doesn't reprogram the VFO until you change the frequency or transmit.

Here's my pull request against the upstream v4 tree that fixes this and another bug. the diff should apply cleanly against the v5 tree too as they're so similar.



On Mon, 22 Apr 2019 at 09:49, Raymond House <raymondh40@...> wrote:
Hi all, my V5 ubitx wont switch side bands on RX, the display says it does but in fact it makes no difference on a RX signal. It does switch side bands on TX. any ideas? Thanks.

Re: lsb/usb

Raymond House
 

Thank you,Adrian, appreciate your help.


On Mon, Apr 22, 2019 at 1:26 PM Adrian Chadd <adrian@...> wrote:
hi!

ok. lemme go see if I can publish an image and send ashar an update for the v5 board.

-a


On Mon, 22 Apr 2019 at 10:23, Raymond House <raymondh40@...> wrote:
Thanks Adrian, but I have a big problem with that, I  know nothing about programming It seems simple in the git-hub link you supplied but it's way beyond my  capabilities. I don't know what to do with that and at my age I don't feel like getting bogged down in something that will no doubt require a lot of time. I can handle a download that would set everything right but that's about it.

On Mon, Apr 22, 2019 at 1:05 PM Adrian Chadd <adrian@...> wrote:
yes, it's a bug in the firmware. It doesn't reprogram the VFO until you change the frequency or transmit.

Here's my pull request against the upstream v4 tree that fixes this and another bug. the diff should apply cleanly against the v5 tree too as they're so similar.



On Mon, 22 Apr 2019 at 09:49, Raymond House <raymondh40@...> wrote:
Hi all, my V5 ubitx wont switch side bands on RX, the display says it does but in fact it makes no difference on a RX signal. It does switch side bands on TX. any ideas? Thanks.

Re: ubitx v5 down: IRF510 heatsink very hot immediately after turning on the radio #ubitx-help #ubitx

Jens Kaemmerer
 


Update on 'fixing TX' after being able to revive RX yesterday:

I had already prepared to remove the existing IRL510 MOSFET's be
practicing 'de-soldering' on some broken electronics boards ...

However, before doing any surgery on the uBitx, I connected the multimeter to
test how much current the existing IRL510 MOSFET's draws.

There was still hope that the IRL510 MOSFET's are not really broken:

Maybe they develop a lot of heat instantly after turning on the radio because they
are actually transmitting because of the 'stuck' relay (K3?) discovered and 'fixed'
yesterday.

The radio had been in RX continuously since yesterday and I simply connected the
brown PA power wire through the multimeter to activate the TX PA circuit. Surprisingly
the 'idle' current draw was so small that I could not measure it with the 10A multimeter
setting, heatsinks stayed completely cool.

A good sign, but will the IRF510 MOSFET's still transmit?

Sending just 2 FT8 CQ's showed that they still transmit (see attached
'pskreporter' screenshot). Current draw while transmitting was 0.48 ADC
(this value seems low?).

Conclusion:

TX and RX are once again working - no surgery required!

Some of the things I plan to do in the future:

1) install MOSFET insulation kit and connect the IRF510 MOSFET's to the aluminum frame of the case for improved heat dissipation
2) go through the PA calibration procedure
3) build a 20W dummy load and to be able to measure power output of the uBitx (https://www.youtube.com/watch?v=O9FLgWoyfsY)
4) experiment with higher PA voltages (16VDC) to increase transmit power (currently using 12VDC)

73,

-jens (KM6ZJV)