A little dusty, but 10 ohms on my V3

I've been working on getting a 100ppr encoder working with my software and it is a pain to get working properly.

You have 3.6 degrees between each step in a 100ppr encoder so unless you use a large knob, it can be difficult to set frequencies easily plus as mentioned, detentless encoders can sit on the transition state causing frequency jitter.

PS the cheap mechanical encoders (as well as the detented 100ppr encoder) has 4 states between detents.

not letting me send a pic

R48 looks toasted. Schematic for v3 says 10 ohm. Pic looks like it's marked as a jumper 000. Can someone please confirm value of r48?
Thanks!?

Some have reported trouble with the BNC connector provided with the kit,
the receptacle is machined a bit too big for the pin.
And no, this is not a 75 vs 50 ohm thing, a 75 ohm BNC would work fine here.

IRF510's can get hot without any RF at the gates if the gate bias is set to high.
Quiescent current should be around 100ma for each IRF510 as described in the hfsignals instructions.

Jerry

Finals are hot implies getting bias current and RF, and that they likely are working. Check continuity from the so239 pin back to the output side of any blocking cap. I think something is no longer connected, and your dvm should find it. Maybe a faulty solder connection,? been there myself.

Curt

Would like to know if there is a GUI for V5?NX4024T32_011?
I uploaded UBITXV5_CIC_V1.122_NE.hex and then loaded UBITX_NEXTION_GUI_V3 UBTIX_32.tft?
into the SD , then put it in the display - it downloaded fine. BUT the display is not fully functional.
Some of the touch screen functions work but not all. Is there a V5 GUI in the works??
Thanks Bill K9JUI

One issue I had was that I installed the v4 version of the CEC firmware on the v5 board. That led to my low-pass switching sequencing getting all fouled up and me not hearing anything; it also messed with my BFO frequency, though it sounds like your BFO is calibrated in the right range for the v5 board. I'd also had some issues with squealing; a new nano helped, but fixing the firmware completely fixed it.

This is the version that fixed my issues:?http://www.hamskey.com/2019/02/release-cec-firmware-v1121-for-ubitx-v5.html

开云体育

What is the best mod for the click/pop. I would prefer a 1 transistor mod but looking for the best recommendation.
Mark
N7HWR

5v at reg out. Changed finals. No go.

Hi everyone...

My dev rig has zero output.

Receive is fine. No tx. Finals are hot without xmitting. Fielding ideas while I troubleshoot. I did have it hooked to a linear. It was acting weird and then went. Ideas??

Thanks,

My case came with several pages of 'instruction.'? one of these conveys the 3 places the LED solders to for the PTT illumination.? I am remembering this thing to be way too bright, so I used larger value resistors (maybe 3 or 4X) to feed the LED.?

I do remember a video that was or is posted to ubitx.com - I found it after I am had assembled but it was very useful as I remember.? Then it was on the front page.?

A key assembly hint -- remove the front panel to allow easy mounting of the raduino and other things into the main board.?

Use your ohm-meter so that you properly connect to the SO239 connector.? Yes find which side is ground and of course this goes to outside of the coax (hint the 4 mounting holes are ground).?

When you get assembled and power up, note as many discovered you won't like the display.? There is a trimmer pot on the backside of raduino, slowly adjust it until you see the nice display.? then note you push the main tuning knob to go thru the various menus (this may not be explained anywhere?)

That 4.7k resistor you install allows straight key CW.? It takes a moment to engage into transmit - so at first it will be strange - but once you adapt to its timing it does CW quite well.?

I will stop answering questions you have not asked yet -- hang in there and enjoy the build, pretend its a puzzle!?

Curt

In my experience, "learning" code while trying to accomplish something with it is about as much fun as trying to balance a tennis ball on the end of a piece of strong.? Please feel free to share any lines as you like, and maybe I'll pick up something from working with it.


Tnx,

Ted

Tom,

I find EER interesting mostly because it helps me think about
what SSB is in the time domain.? We normally think of SSB as a band
of simultaneous frequencies roughly 2500 hz wide, but somehow?
that can be represented as the voltage in a single node that varies with time.

This business of the DSBSC modulator flipping carrier phase is interesting
for the same reason.? Curious that the phase change is instantaneous,
though happens only at times when the signal is fully suppressed.
After going through the 12mhz crystal filter to strip off one of the sidebands,
a 1khz audio transmission is now just one sideband that is 1khz away
from the 12mhz bfo, no phase changes, at no time is the signal suppressed,
a pure CW carrier.? Very curious!?

Having spent a career in digital design, I find PWM generation of RF compelling.
Should be possible without much drive to the gates.? Here's a 1000W 440mhz
single stage linear amp, the LDMOS FET's need 10W of drive:
? ??
So seems reasonable that we could do fairly clean PWM for anything up to 30mhz or so.
Unfortunately, that's several hundred dollars worth of LDMOS FET's,
though I certainly don't need 1000W.

Hmm, maybe play with IRF510's generating RF for the 472khz band?

Jerry, KE7ER

All,

?Choosing? to "Enable Adjust CW Frequency" got me closer (200 Hz) away now. Is that close enough or do I need to adjust the "CW Freq Adjust value" ? I tried adjusting the BFO and that didn't see to do much.

Thanks
73's

Mike WA3O

Where does the led connect to? In photos it seems to connect to the underside of the main board.

My compressor/limiter?is a dual opamp circuit with the second unit as a unity gain current buffer. There is an output control before that stage. So, it from the above discussion I take it that I will need some series resistance after that stage in addition to the level control I already have before it. I'll try a 50K linear pot.

Thanks for the replies.

Fred

The manual for the module says it has been adapted to the ubitx, and it looks to me like it would work readily enough since it is audio only.??