Date   
surprising CW sidetone value in uBITX Manager 0.11 #ubitx

Mike KK7ER
 

I upgraded to CEC 1.08 firmware and ran the uBITX Manager Ver 0.11 software.
It shows reasonable values for most fields.
However, it shows CW Side tone as 4294967295 Hz ( which interestingly is 0xFFFFFFFF).
This is obviously incorrect since it is far beyond human hearing.
In fact I'm surprised that side tone frequency in Hz is encoded with 32 bits.  Seems like overkill.
When I look for CW side tone from the LCD panel menu it is nowhere to be found.  Hmm...
CW speed in uBITX Manager is also shown as 4294967295.
When I view CW speed from the LCD panel it is shown as 12 WPM.  This implies that the register value should be 100.
This leads me not to trust uBITX Manager.  Should I?
Either uBITX Manager is wrong or the LCD panel is wrong or... ?

73 Mike KK7ER

Re: surprising CW sidetone value in uBITX Manager 0.11 #ubitx

Mike KK7ER
 

BTW, I should mention that the version 1.08 that I installed was compiled from the tip of the master branch of the Git repository as of Sunday.  I also tried the precompiled "HEX" file and it behaves the same way.

73 Mike KK7ER

Re: receive works great, but no trans power, #ubitx-help

Jerry Gaffke
 

We have had a couple reports of Q90 frying, but not the mixer.
Perhaps as Gordon notes, these were due to a strong VHF signal.

I believe Gordon has suggested in the past the the failure mode might be 
due to reverse voltage at the BE junction, not forward current.

I have no idea if the back-to-back diodes would significantly contribute to the spurs.
Doubt it would cause trouble where I'm at, as there are no strong local broadcasters.
I should try it, include a strap to remove the diodes if curious about some new spur.
We've got plenty of electrical storms.

Jerry

 

On Tue, Jul 17, 2018 at 01:28 PM, ajparent1/KB1GMX wrote:
It the signals are strong enough to fry Q90 the mixer will soon be gone too.
The BE junction is as robust as the mixer diodes.  so whatever you are seeing
is quite strong and could even be ESD.

For ubitx (V3 or 4) a pair of back to back 1n194/4148 diodes from K3 Pin14 to ground
is the best bet as then its only there for RX and has no impact on TX.

Bitx 20 and 40 the solution is different.

Its easily done on the back of the board.

Allison

Re: RD16HHF1 power curve flattening...some

Kevin Rea
 

On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea

Re: RD16HHF1 power curve flattening...some

MVS Sarma
 

I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
 
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea


Re: RD16HHF1 power curve flattening...some

Ashhar Farhan
 

Are you sure that the pins are not shorting? 


On Wed, 18 Jul 2018, 10:23 Mvs Sarma, <mvssarma@...> wrote:
I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
 
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea


Re: RD16HHF1 power curve flattening...some

MVS Sarma
 

Farhan jee
 the "c" mark on the right of Logo indicates that devices are fake.If  IRF530  re labelled as indicated that they are fake. I had a bunch of therm. If some one doen't check under item details for a comment   "Make: generic / unbranded" They do get fake ones.

 if we get IRF530 or so re labelled as RD16, Obviously there would be a short , of course through the internal protection diode.

Regards
MVS Sarma
 

On Wed, Jul 18, 2018 at 11:13 AM, Ashhar Farhan <farhanbox@...> wrote:
Are you sure that the pins are not shorting? 

On Wed, 18 Jul 2018, 10:23 Mvs Sarma, <mvssarma@...> wrote:
I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
 
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea



Re: RF power chain mods and improvements..

Nick VK4PP
 

On Mon, Jun 11, 2018 at 03:54 AM, ajparent1/KB1GMX wrote:
MPSH10 was disappointing.
I just tried these in mine too for pre-driver and drivers. <5w output....

I had some 2n5109 turn up today so will put them in tonight. One under the board one on top. as flat as I can get them...

The BFR106 made a big difference in the SMT pre-pre-driver Q90
Will also try them in the 45mhz mixers...

73 Nick VK4PLN

Re: RD16HHF1 power curve flattening...some

 

Some fake RD16HHF turned out to be IRF510 on my tester. The pin orientation was IRF and so was capacitance.
They worked fine in my B40 boards.

Raj


At 18-07-18, you wrote:
Farhan jee
 the "c" mark on the right of Logo indicates that devices are fake.If  IRF530  re labelled as indicated that they are fake. I had a bunch of therm. If some one doen't check under item details for a comment   "Make: generic / unbranded" They do get fake ones.

 if we get IRF530 or so re labelled as RD16, Obviously there would be a short , of course through the internal protection diode.

Regards
MVS Sarma
Â

On Wed, Jul 18, 2018 at 11:13 AM, Ashhar Farhan <farhanbox@...> wrote:
Are you sure that the pins are not shorting?Â

On Wed, 18 Jul 2018, 10:23 Mvs Sarma, <mvssarma@...> wrote:
I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
Â
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@... > wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" < passionfruit88@...> wrote:
Hi John,

did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea


Re: I think this will work for the Ubitx...microphone

Mike Woods
 

Kevin

If you search on miklor.com you will find the wiring diagram for the Baofeng speaker/mic.

You will need to modify the mic to work with the uBITx (but not the BITX40 or BITX20) because the T/R switch is on high with 5v on it.

Separate out the switch from the mic internally.

M

On 18/07/18 9:53 AM, Kevin Rea wrote:

Hi guys,
I am just getting ready to build my first Ubitx.
I am going to use a Baofeng Microphone to do it.. so I bought one and took it apart..
and this is what I came up with after tracing the wires..
I am just using the microhone part of the mike, not the speaker.

I think this will work......????


Kevin Rea
K6REA


--
Mike Woods
mhwoods@...

K5BCQ click fix 2nd generation installed #ubitx

W7PEA
 

I didn't see pics of this in the site, so I thought I'd share mine. Continuity tests all look good. But, man tombstoning those surface mounts was hard! I Now understand why there was a REV 3. :-)

Re: The new uBITX boards are here

George
 

Dear Mr Farhan
As about me for several days I was asking for help as I've lost the original soft for scale and control of the Si5351. At last I've  find HEX file by KD8CEC and I am happy that it works!( Used XLoader).
But till this time did not find the original file and besides this I am not the Arduino specialist. A lot of words but no FILE and how to load it!
To my mind the R50 feed back of the Q70 should be raised to 820K to raise collector U from 1.8 to 6 V - not to over load it by strong signals. 
Problems: great carrier in SSB mode TX, more then modulation speech signal! What is it? to use only in reception mode?
The final 12 MHz filter is too wide and do not have 6/60 dB features, + some out of channel signals! But stii very simple and original transceiver not noisy with good sound! Some raising of the price of something 140-150 will not be too much for it. Best regards to you and your team 73! George UR4CRG/RX3ARG

Re: #ubitx #ubitx-help Not able to set up extension switches using CEC firmware #ubitx #ubitx-help

Daniel Conklin
 

Yes, I followed the instructions on the blog and the video. The values that should have been reported by the manager are not the expected results  

Re: receive works great, but no trans power, #ubitx-help

Gordon Gibby <ggibby@...>
 

That would make for a very useful experiment!   If you try it, let us know what you find out!

It’s possible that different transistors have different reverse (base-emitter) break down voltages, which would dramatically change the amount of energy deposited on the base-emitter junction by a strong signals.... I just don’t know enough about the devices to say for sure.


On Jul 17, 2018, at 23:30, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

We have had a couple reports of Q90 frying, but not the mixer.
Perhaps as Gordon notes, these were due to a strong VHF signal.

I believe Gordon has suggested in the past the the failure mode might be 
due to reverse voltage at the BE junction, not forward current.

I have no idea if the back-to-back diodes would significantly contribute to the spurs.
Doubt it would cause trouble where I'm at, as there are no strong local broadcasters.
I should try it, include a strap to remove the diodes if curious about some new spur.
We've got plenty of electrical storms.

Jerry

 
On Tue, Jul 17, 2018 at 01:28 PM, ajparent1/KB1GMX wrote:
It the signals are strong enough to fry Q90 the mixer will soon be gone too.
The BE junction is as robust as the mixer diodes.  so whatever you are seeing
is quite strong and could even be ESD.

For ubitx (V3 or 4) a pair of back to back 1n194/4148 diodes from K3 Pin14 to ground
is the best bet as then its only there for RX and has no impact on TX.

Bitx 20 and 40 the solution is different.

Its easily done on the back of the board.

Allison

Need a video on ubitx troubleshooting

Richard E Neese
 

I have a ubitx v4 it was workign fine on my 12v 3 amp power brick all fo a sudden whip transmitting the unit shut off and cam back on. Now the reciever is working fine but when I transmit I het a loud carrier with a hum to it and no audio output ... I figure something in the transmit section went bottoms up but looking at it with a usb based microscope I see nothign blown on the board no bubbles on chips and no broken or burnt wires.

any input would be helpfull

Re: Need a video on ubitx troubleshooting

 

Check voltage at R104, should be 0v. Sounds like CW is on!

At 18-07-18, you wrote:
I have a ubitx v4 it was workign fine on my 12v 3 amp power brick all fo a sudden whip transmitting the unit shut off and cam back on. Now the reciever is working fine but when I transmit I het a loud carrier with a hum to it and no audio output ... I figure something in the transmit section went bottoms up but looking at it with a usb based microscope I see nothign blown on the board no bubbles on chips and no broken or burnt wires.

any input would be helpfull

Re: receive works great, but no trans power, #ubitx-help

Jerry Gaffke
 

That strap could cut Q90-base out of the circuit too, in case that causes RX spurs.
Probably OK to leave the back-to-back diodes in there near Q90-base (to the left of C80)
during transmit, as I doubt we have much more than 0.1vrms there.

Unfortunately, I've got a very long list of stuff to do while the weather is good.
Fiddling with the uBitx isn't on it.

Jerry, KE7ER



On Wed, Jul 18, 2018 at 03:53 AM, Gordon Gibby wrote:
That would make for a very useful experiment!   If you try it, let us know what you find out!
 
It’s possible that different transistors have different reverse (base-emitter) break down voltages, which would dramatically change the amount of energy deposited on the base-emitter junction by a strong signals.... I just don’t know enough about the devices to say for sure.

 
 

Re: Low output Bitx40

Allen Woolfrey
 

Just finished wiring my bitx40. 

Draws ~350ma with PTT, but no change at all when yelling or whistling into mic.  (Dummy load present at all times, so don't suspect final blown.)

I see lots of discussion around this issue, but would appreciate advice on how to troubleshoot.

72/3, Al - va3iaw

Re: Low output Bitx40

 

Al, check the electret condenser mic element soldering. Polarity is important.

Raj

At 18-07-18, you wrote:
Just finished wiring my bitx40.

Draws ~350ma with PTT, but no change at all when yelling or whistling into mic. (Dummy load present at all times, so don't suspect final blown.)

I see lots of discussion around this issue, but would appreciate advice on how to troubleshoot.

72/3, Al - va3iaw

Re: Low output Bitx40

Allen Woolfrey
 

Thank you for quick reply.

Re-checked soldered correctly, and confirmed continuity to board connector.