Date   
Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

_Dave_ K0MBT
 

You have some common mode RF floating around. Start by choking the coax. Google w1his, He has some complete thoughts about common mode issues and shack noise.

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

Sam Tedesco
 

Sticky relay. Lightly smack the relay (off by itself) with the handle of a screwdriver. 

Mag Loop for HOA's??

Jack, W8TEE
 

All:

We took Al's Double-Double mag loop:
Inline image
for a spin at FD. We ran 100W on 20M and 40M. First, we were surprised how well it performed for a "compromise" antenna. We worked 40M on Saturday and worked KS to ME, WI to FL. We even managed to work pileups, often towards the front of the pile. The stepper controller looks similar to this:

Inline image
although this photo was taken before the software was finished. Two encoders control the "target" frequency (e.g., 7199995) and the stepper motor, with the SWR calculated using an AD9850 as a signal source. The final version shows a 100-point plot of the SWR as you tune the cap to resonance on the target frequency. The cap position and frequency are very close to linear, so the final version will "fast step" to the target frequency and the encoder can then fine tune from there. We can tune to 1.1:1.0 on 40-30-20M. The display is a small 2.2" TFT display, but any SPI TFT using the ILI9341 driver could be used.

Quite honestly, Sunday wasn't as good. We concentrated on 20M and we were expecting better performance. (The models say it should perform better on 20M.) We didn't hear as many stations as on 40M on Saturday, but we're not sure if it was all antenna, band conditions, or a mixture of both. Al and I will be writing an article on its construction in a little bit after some testing that will give us some concrete numbers. We are devoting one chapter in the new Projects book to its construction and a second chapter to the stepper controller.

I will be trimming off the "spike" at the top for mine, which will allow it to fit in my car trunk. (I want to call it the "Luggable Double-Double", but Al doesn't like it.) Anyway, it will all be put into Open Source and we hope that some HOA-bound hams might find it useful since its 3' diameter might fit in an attic or somewhere else that the HOA considers acceptable.

BTW, I hope your club had as much fun at FD as we did...despite some rain.


Jack, W8TEE
Al, AC8GY

Re: Antuino

WoodJRx@...
 

I just thought i'd add that I just swapped my Antuino over to openGLCD, from the deprecated original GLCD.  I'm no programmer, just trying to be a tinkerer and teach myself.  I've figured out how to make a testing branch on github.  If anyone else would be willing to make sure my changes work (they do here, at least), I would greatly appreciate it!  As Bruce says - Use at your own risk!

My testing branch is https://github.com/woodjrx/antuino/tree/testing

I love the idea of the lookup table - but I need to get a step attenuator to test against, first!

~Josh
W0ODJ

Re: Britx 40 Raduino Help

 

His is a picture of my original without the display. Hope that gives you the idea where to connect the 5pin.

Raj

Emacs!


At 24-06-19, you wrote:
i am attempting to assemble a Britx 40.

Instructions call for "connect a 5 pin connector to the bottom side of the Raduino"

There is none on the board.

Do I have the wrong board or is there a work around? (picture)

Any help appreciated

AA7MH

Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

Mark Hatch
 

I am all set. All bands legal (USA) for CW except for 10m where the secondary harmonic is only -30 down. 

73
Mark
AJ6CU

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

MVS Sarma
 

Did you wire up the 4k7 resistor from Vcc ro cw wire?


On Tue, 25 Jun 2019, 8:54 am Sam Tedesco, <stedesco619@...> wrote:
Sticky relay. Lightly smack the relay (off by itself) with the handle of a screwdriver. 

Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

 

Mark I have both S+M and A T, both are working fine on my many test boards.
Every board is very individual in behaviour. I have some which put out lots of power
and some low power out. I have not figured out why as yet.

Some boards I changed only L5 and that was enough. Any RF pickup by L7 is removed by
the filter Y1 during TX.

Raj


At 24-06-19, you wrote:
Raj,

Thank you very much!

However, I am worried that the inductors I have are not the exact same ones you used. I got them from another HAM that ordered them thru the same supplier that you used, but EBAY suppliers have been know to substitute.

Mine are orange/yellow and are marked "A" and "T" and R68K 1145. However, in your post#60946 you said that they were Marked "S+M". I assume the 68k means 680nh? Perhaps the A+T vs S+M is a country/manufacturing plant?

Thoughts?



I suspect that the apparent power loss on 80/40 is not true. I measured harmonics/spurs 4x. For the Primary:

Band                    1st                     2nd                      3rd                         4th (after l5/l7 replaced)
80                       -65                       -64                      -57                        -65
40                       -67                       -67                      -65                        -70

80M looks like man outlier. And i really don't knew what i am doing with the SDRPLAY spectrum scope software, so mistakes could creep in.


40M does look lower after inductors. I am going to re-measure later today.

73
Mark
AJ6CU

Re: trick to soldering in L5 and L7 or why did spurs on 80/40 get worse and 20/10 get better...

Mark Hatch
 

Raj,

I am sure you hear this a lot, but a big thanks for working on the purity issues with the uBitx. Myself, and many others would have been lost without your (and of course others) hard work here. Thank you!

73
Mark
Aj6Cu

Re: Mag Loop for HOA's??

Mark Hatch
 

I think i know what my next project is after finishing my JackAl radio. :-)

I think this would make my 3rd project based on your work. So much fun!
:-)

73
Mark
AJ6Cu

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

MVS Sarma
 

Better replace k1 relay


On Tue, 25 Jun 2019, 8:54 am Sam Tedesco, <stedesco619@...> wrote:
Sticky relay. Lightly smack the relay (off by itself) with the handle of a screwdriver. 

Re: Mag Loop for HOA's??

Floyd Hollister
 

Jack and Al,  This is a neat project and I look forward to youir article. 73, Floyd K2DUV

uBitx not receiving well on CWU or CWL

Mike Kilpatrick
 

my uBitx is receiving and transmitting very well on SSB. 

I can receive CW signals very well in USB or LSB mode.  But when I select CWU or CWL mode signals drop right off and are barely audible. 

I have V5 board and CEC firmware. 

Any my suggestions would be really appreciated please. 

Re: VK4PP Ultimate uBitx Daughter Board. #ubitx #filters #parts

Dennis Beverage
 

Me too! and much thanks for efforts to really help all of us.  I’ll want one board for my my V4.

sodypop
KJ6VGB

Re: Mag Loop for HOA's??

ke6bgn@...
 

Jack,
Do you think this controller would be able to be used with the MFJ loops fairly easily? If so, this could be an excellent alternative to the manually driven setup that the factory setup provides.
--
73 de RC.....KE6BGN

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

John Faivre
 

Yes. I have been using it for 4 months. WAS in 3 months FT8. This is a new problem.
--
John Faivre WA9SGD

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

John Faivre
 

I suspected a sticky relay. I’ll try replacing it. 
--
John Faivre WA9SGD

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

Jens Kaemmerer
 

I had the same problem and narrowed this problem down the K1 relay by measuring
the relay outputs for K1 and K3.

I decided to replace the K1 relay and have had no issues ever since.

Replacing a relay was quite an undertaking because I had to somehow
desolder 8 pins simultaneously. After trying out various methods without
success (removing solder with desolder braid, etc.) I created a U shaped
'heat transfer' device out of 1 mm copper wire and re-added solder
to connect the 8 pins with the 'heat transfer' device. Holding the
soldering iron to the 'heat transfer' device then allowed me to slowly
remove the old relay. Then I cleaned up the through holes with desolder
braid and installed the new relay.

-jens (KM6ZJV)

Re: Ubitx occasionally hanging in transmit while receive led is on. Have to hit cw key a few times to get it unstuck. Ideas? #ubitx

David Nelson
 

I looked online and bought an iron with built in solder sucker. Used it to
replace all the relays on my board and it worked perfectly.. the relays popped
right out and the holes were left clean. New relays popped right in. no problems
at all.     Dave    kc2ipx

Re: Mag Loop for HOA's??

Jack, W8TEE
 

I don't know much about their loop, but as I recall, everything is sealed inside a plastic housing. That would suggest a "No". Given that their loop costs around $400, it would be significantly cheaper to build the Double-Double. The main expenses for the loop are the copper tubing (figure 4 10' sections plus some fittings) and the AD9850 module (DDS). The PCB will cost under $10 and most parts are inexpensive except for the DDS. It's something to think about.

Jack, W8TEE

On Tuesday, June 25, 2019, 11:01:12 AM EDT, ke6bgn@... <ke6bgn@...> wrote:


Jack,

Do you think this controller would be able to be used with the MFJ loops fairly easily? If so, this could be an excellent alternative to the manually driven setup that the factory setup provides.
--
73 de RC.....KE6BGN