Should be 11.055,5 It's close enough.

Doug,

Are you sure it is a v5? ?That would be closer to a v4. There are two ways to tell:
1 - There is a version # printed on the board
2 - Check the crystal filter crystal frequency stamped on the top of one of the 12 crystals that are all in a line. A v5 is 11.059, a v4 is 12.000?

Another way is to check the audio circuit. The v4 uses discrete transistors, the v5 has an lm386 ic for audio output.?

If a v5 OR v6 bfo were set to that frequency, it would be deaf.?

The BFO needs to be set approximately 3.5 KHz below the crystal frequency, with final adjustments for each board.?

Check the version number and then go to the BFO calibration page?

Hope this helps,
73
Evan
AC9TU

I also have a D-104 without an element.? How about a bit of a tutorial on how to install this element?? Thanks & 73?

Hi Raj
Thanks for that info. Saved me a lot of turning...
Do you know what the approximate frequency of V.5 should be?
Doug

Hi Ed
I checked with an ohm meter from the center connector of the coax to TP1 on the printed board. That is thru the low pass filter. I have continuity.
I could possibly have a cold soldier joint on the pcb. If nothing else seems to works, I will pull the PCB out of the case
and start reheating connections on that path. Thanks for the suggestion.
Doug

Wrong firmware Dough! that BFO frequency is for V3 if I remember right.

Raj

28/03/2020, you wrote:

Hi Dave
Thanks for the PDF. Very helpful.
Doug

Hi Evan
I have a question. You said that the BFO frequency for V.5 is around 11.0555 mhz. Mine is at 11.995 mhz. That is a long way off. A lot of turning.
Doug

This is exactly what I needed. Thank you!
--
Mark, kb9woo
Milwaukee, WI uBITX v6

开云体育

Doug

What was the 10cent element?

Definitely check the alignment. I have seen very deaf receivers caused by miss alignment.? If that doesn't do it, it should be very straight forward to trace the signal. You don't really need much in the way of test equipment. You might start with a probe on the input of the audio amp.

Ashhar has kindly put in many test points that you can test from.? More or less follow the yellow brick road back to the antenna.

This drawing outlines both the transmit and receive signal paths
73
Dave

Hi Evan
Thanks for your response.
No, I did not use the method you suggested but will try it soon. That may be the answer.
I do not notice any difference in the rf level in the receiver with the antenna connected or disconnected.
The rf level is very low. I can transmit with the Ubitx just fine.
I hear a few birdies across the spectrum and they can be quite loud with the volume turned up.
I have continuity from the coax center connector to TP1 which passes thru the low-pass filter.
If I transmit with another transmitter with one or 2 watts I can hear it loudly on the Ubitx receiver.
It makes no sense to me, but I will do the BFO calibration as you suggested. I will let you know the
outcome when I'm done.
Thanks Evan
Doug

where can i download the original software that was installed on my v6 when produced in india

Hi Curt
Thanks for your response. I do have a cw sidetone and it is loud with the volume turned up.
I hear the relay click when I transmit. I measured continuity from the coax center connector to TP1 which passes thru the low-pass
filter. I also can tune a couple birdies across the spectrum that are quite loud. So I think the audio circuit is fine.
I have a low level rf noise on receive, but it makes no difference in the level with the antenna connected or not. The rf noise sounds
like a receiver with the antenna disconnected. If I transmit with another transmitter, I can hear the cw tone loud with one or two watts .
It makes no sense to me.
Well Curt, thanks again and if you think of anything else I would appreciate the info.
Doug
?

And the story??, okay thx for fast reply, the receiver i used, the yupiteru, is on ssb, i tryed both, usb and lsb.
The peeeep is also when i just put on a stereoplug in the mike hole and connect (shortcut) the ptt. I shall try what the readings are on cw. I have a few times recaibrated the radio, yesterday on china radio 15.350khz.
Then bfo, then freq again and then again bfo. The receiver of the radio is good, i isten often to FT8 and phone. The wire antenna, 10 meter with a coil, gives me a lot of amateurs all over the world, even Korea, New Sealand , Us etcetc.?
I know a guy on my job, he got also his licence and i am gonna ask him for help. Problem is corona,no contact with other people but your family in your house...
So after work today, i gonna try to make time free again to play with the radio.. Thanks for answering you all.
Regards, Rene
Netherlands

Okay have fun but no corona there, every evenement is canceled overhere??

How did you calibrate the BFO?? Did you use this page?


It will work with just about any uBiTx, as all are set up for approximately a 2.7 KHz audio bandwidth between 300 Hz and 3 KHz.? The difference is the BFO frequency.? For the v5 it is around 11.0555 MHz.??You set it up by tuning to a "clear" frequency and adjust the plateau peaks to be between the red lines.??

A simple test to see if the receiver is working, in general, is to verify the change in signal level (static) between an antenna connected and one not connected.? Without an antenna connected it should be very quiet, and get significantly louder when connected.

Most of the receiver signal issues listed on this board are ultimately solved with the BFO and then the frequency calibration process and then back to the BFO, in that order?

NOTE: for the stock v5 uBiTx, the frequency calibration process (non-BFO) will put the rig into transmit mode at 10 MHz.? You need either a frequency counter or another receiver and a dummy load.? You need the dummy load as 10 MHz is not in a legal ham band.? You do not want to send the signal out over the air.

My first dummy load was 4, 2 watt 47 ohm, resistors with 2 sets of 2 parallel resistors connected in series.? Gives you a 47 ohm,? 8 watt capable, load.? Good for short transactions with the uBiTx.? You can mix and match whatever you have in your junk box.

My experience with both the v4 and v5 uBiTx is that when calibrated (and an audio amp for the v4) they are very close to my Icom 7300 in receive sensitivity and selectivity for SSB.? Just does not have all of the filter and other features of the "big" rig.

Good luck, learn,? and have fun!?
73
Evan
AC9TU

The com port changing is pretty normal. Windows will re-number the same device depending on what specific USB port you plug it into, which is a bit silly, but that's how it works.

A few follow up questions:
1) Can you please copy the text or screenshot the errors you're getting?
2) You get a white screen, but can you tune around and/or hear anything using the tuner knob? I know I saw white screens using some of the stock software, but could also be that it got corrupted while trying to program.
3) When you're trying to program the radio, do you have the radio turned on? If not, your computer will try and back-power stuff, which, depending on your computer's USB port, may cause stuff to brown out.


Reed