Date   
Re: Keyer for ubitx #ubitxcw

Sam Tedesco
 

Ouch...sorry about your toe.  I have two pics. The resistors for the paddles on the rear board. They come together to the yellow wire and it is soldered to the left side of the pull up resistor (screwdriver pointing to it) on the bottom of the board. On the rear board, you can see the thin white wire (pointing to it)that thato ground to complete the paddle circuit.

Re: W8TEE Mag Loop Testing

Jack Purdum
 

I think I'm going to use a 6" piece of PVC pipe for mine. I have several air caps that would work and one VVC. I'll make the cap decision after we get some more testing done.

Jack, W8TEE

On Thursday, May 30, 2019, 7:17:17 PM EDT, Terry Morris <terry.kb8amz@...> wrote:


I think Peter uses either Rubbermaid or Tupperware for water resistant his variable capacitor. Or, you might try an inverted Glad sandwich bag draped over the wood block and Vari/cap to protect from water.   LOL :)


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


On Thu, May 30, 2019 at 5:06 PM Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
Yep, we know about the HV issues. The cap is run by a NEMA 17 stepper which Al has geared down. The stepper controller goes to 1/32. We're still experimenting with timer interrupts to slow it even more, and then speed it up. More work.

Jack, W8TEE

On Thursday, May 30, 2019, 2:56:00 PM EDT, Jim <Jscook@...> wrote:


That’s a nice looking loop. What are you driving the cap with? I found a nice Comet vacuum variable capacitor and also a drive set up for it. Haven’t gone any further. Keep the group updated. Watch the HV around the cap as it can get high..safety.
Jim
WA3APC


Re: uBITX will not turn on

giant
 

I rewired the power and it's still the same.

Re: uBITX will not turn on

giant
 

After watching the video several times, it looks like he just missed the ground on the antenna, nothing else. I do have the ground on the antenna, so that isn't it.

Re: Keyer for ubitx #ubitxcw

Kelly Mabry
 

Curt you are always a good source of inspiration for me; I thank you buddy, for your encouraging words. I love my little ubitx. The toe is getting better, i am walking better.

Thanks & 73,
Kelly KD5AJ 

Re: Kit-Projects ND6T Ubitx AGC

digger AB3XU
 

Ooops, accidentally deleted my last post. Will repost tomorrow.

Re: Keyer for ubitx #ubitxcw

Kelly Mabry
 

Sam, I see how you did it. I feel confident I can do the same thing. I will try this fix during the weekend. I have a sermon to finish tonight and tomorrow. Thanks to you also
for coming to my rescue. I see now that i had tried to solder to the wrong side of that resistor up front. 

73 & Thanks again!

Kelly KD5AJ 

Re: Keyer for ubitx #ubitxcw

Sam Tedesco
 

Hope it works out for you. FYI, my rear ports are a bit deep for the 3.5mm plugs to push in all the way. I had to shave a bit of plastic from my plugs to push them past the metal case.

Once we get paddles working, we'll run an ADC test to confirm proper converted voltages. Then, we can run the blocking diode on r52.

    

Re: Keyer for ubitx #ubitxcw

Kelly Mabry
 

Sounds great  Sam!

73,
Kelly KD5AJ 

Re: uBITX will not turn on

 

When turned on with power connected, do you get 12V on the board.
Start from the 3 pin power connector.

Raj

At 31-05-19, you wrote:
I rewired the power and it's still the same.

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Jack (of JackAl fame), suggested that I might look at replacing that standalone signal analyzer Nano with a ESP32. At $10 for amazon prime for 250mhz + 1.3mb flash and Arduino IDE compatible.... Well, being delivered tomorrow. :-) Yet another project to learn from. :-)

73
Mark
AJ6CU

BTW: Now got horizontal and vertical scaling of spectrum analyzer working on 5". Lots of cosmetics yet....

Re: Power supply for Biix40?

Olivier Grand
 


Garanti sans virus. www.avast.com


Le jeu. 30 mai 2019 à 23:25, John Cardoso <ve9pct@...> a écrit :
Thank you folks for your replies, Sam, Bob, Ian, fejohnso, etc... :)  much appreciated.
I was/am mostly concerned about possible noise interference (due to their high switching frequencies) with the Bitx40.  I think I would have some trouble :(
Thank you all again.

Re: uBITX will not turn on

iz oos
 

I have a 2 amp that goes in protection when turning on. Just trying to turn it on without transmitting. But when I use a greater amp I have no problem.


Il 31/mag/2019 06:27, "Raj vu2zap" <rajendrakumargg@...> ha scritto:
When turned on with power connected, do you get 12V on the board.
Start from the 3 pin power connector.

Raj

At 31-05-19, you wrote:
>I rewired the power and it's still the same.




Re: Antuino

David Wilcox
 

Tried mine last night after fixing the power jack connection.   It shows 1:1 on any and every band no matter what antenna is connected to it or if a tuner is used no matter where the tuner is set. Also when set for 14 MHz it scans at 10 MHz and then jumps to 14 MHz when the scan is done.... still shows 1:1 SWR.

Any ideas?

Dave K8WPE

David J. Wilcox K8WPE’s iPad

On May 30, 2019, at 3:07 PM, Bruce Hall <bhall66@...> wrote:

Linearity issues aside, the Antuino is very handy for evaluating and aligning RF filters.  Attached photo is a 30M bandpass filter under test.  Measuring insertion loss, center frequency and bandwidth are all straightforward.  (Note: the 1X oscilloscope probes aren't the best choice but were on the bench.  They add attenuation without significantly changing the filter shape.)

Bruce


On Wed, May 29, 2019 at 3:31 AM Ashhar Farhan <farhanbox@...> wrote:
I guess, we need a better post mix amplifier? probably increasing the current there will help? I am not sure where this non-linearity is coming from. I suppose at least 70 db of linear range will be good. this is about 50 db.

- f

<bandpass.jpg>

Re: Power supply for Biix40?

John Cardoso
 

Hi Olivier,
Thanks for taking time to reply to my post.
I was/am thinking in something that I could place inside my case (which has lots of room left.)
I might end up to build one.
Thanks again
-John-

On 5/31/2019 2:25 AM, Olivier Grand wrote:

Garanti sans virus. www.avast.com

Le jeu. 30 mai 2019 à 23:25, John Cardoso <ve9pct@...> a écrit :
Thank you folks for your replies, Sam, Bob, Ian, fejohnso, etc... :)  much appreciated.
I was/am mostly concerned about possible noise interference (due to their high switching frequencies) with the Bitx40.  I think I would have some trouble :(
Thank you all again.

RX of uBITx V3 fried - which components to change? #ubitx

Sascha Bohnet | DL5SMB
 

Sometimes I think I am the dumbest ham ever.

Last night I accidently confused coax cables and connected my antenna analyzer to the uBITX instead of the antenna.

The result was that I successfully killed the rig. The analyser is sending out a signal of 13dbm/0.02W (according to the manual of the Rigexpert AA35 Zoom) which seemed to have fried the RX input.

I do no receive signals any more (not even strong broadcast stations), the only thing I can still hear are the mixing products of the nanos oscillator.

Still 10 days on vacation - and that happens within the third night. So stupid.

Any tips where I should look when I get back home?

My first guess would be the AGC by N6DT which I had installed .

This should be easy to check by just shorting the Input and Output of it again. If there is a signal again  it's most probably one of the mosfets there.

If this is not the cause I think I should check the transistors Q10-Q12, maybe Q30-Q32 (if the TX is also dead, did not check this yet as I do not have another receiver here) and maybe Q70 (but unlikely).

Is this correct? Any suggestions? Or am I wrong and it is most likely something else?

This is so annoying. First time I was really making QSOs with this rig and also the first time I used the 20m band. Man, this was so much fun :-/

Re: RX of uBITx V3 fried - which components to change? #ubitx

iz oos
 

This shows that a couple of back to back diodes somewhere in the RX chain (albeit they might worsen imd figures) might be useful to prevent or mitigate this sort of damage. If you have a signal injector- tracer like Hendricks kit you might find the corrupted transistor. Otherwise just replace all of them. They cost pinnuts.
.


Il 31/mag/2019 13:23, "Sascha Bohnet | DL5SMB via Groups.Io" <saschabohnet=googlemail.com@groups.io> ha scritto:
Sometimes I think I am the dumbest ham ever.

Last night I accidently confused coax cables and connected my antenna analyzer to the uBITX instead of the antenna.

The result was that I successfully killed the rig. The analyser is sending out a signal of 13dbm/0.02W (according to the manual of the Rigexpert AA35 Zoom) which seemed to have fried the RX input.

I do no receive signals any more (not even strong broadcast stations), the only thing I can still hear are the mixing products of the nanos oscillator.

Still 10 days on vacation - and that happens within the third night. So stupid.

Any tips where I should look when I get back home?

My first guess would be the AGC by N6DT which I had installed .

This should be easy to check by just shorting the Input and Output of it again. If there is a signal again  it's most probably one of the mosfets there.

If this is not the cause I think I should check the transistors Q10-Q12, maybe Q30-Q32 (if the TX is also dead, did not check this yet as I do not have another receiver here) and maybe Q70 (but unlikely).

Is this correct? Any suggestions? Or am I wrong and it is most likely something else?

This is so annoying. First time I was really making QSOs with this rig and also the first time I used the 20m band. Man, this was so much fun :-/

Ubitx (2.0) - Screen too bright - cannot see when seeing straight

Sajid Rahum
 

Gurus.

Finally after time permitting; i was able to get the ubix 2.0 running after 1 year of it being in the box; i had done the audio amp fix and that is now very very loud. no complaint.

one thing odd i saw.  When i am looking at the screen straight on - either it is the brightness - no characters can be seen.  But if i am looking from the side or at 20 deg downwards or more; it is completely visible. 

Do I need get the brightness down or is there an setting somewhere i need to make?

Today will plug in the baofeng mic - just the mic only - speaker is mounted on the top board of the box.

will appreciate any help; i will post photos of the display when i get home as well.

Re: First time fired up #ubitx-help

Sajid Rahum
 

Hi Peter

I have exactly the same issue on the display.  Have posted it as well.

Re: Ubitx (2.0) - Screen too bright - cannot see when seeing straight

Sam Tedesco
 

There is an adjustment pot on the back of the raduino