Thank you for your response. I do not have a second receiver?to check it with. The relays do click when the PTT is pushed.

-William

Thanks much Vic, That makes sense....I saw it went to 10mhz and that the receiver went dead, now I know why....Should be able to get it on the money now....Mike

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After serious deliberation, I have decided to sell my ubitx transceiver.
I have done Raj's mods - the 45 Mhz filter inductors replaced by smd's, the new filter in front of the second mixer and the 2 resistors have been changed to increase the gain.
I have also added the N6DT agc mod and a TDA2030 audio amp.
It was changing the smd's that did it!
I'm getting a bit too long in the tooth to be able to handle these little beggars, Apart from that, since I retired I don't have access to a spectrum analyser or any other form of sophisticated equipment.
I have enjoyed putting this together - it's rekindled my interest in ham radio, but I do know my limitations.
It comes in a pretty blue (Chinese) box complete with a Nextion 2.8 display.
The receiver works very well and as far as I'm aware, the transmitter is ok, although I've never had the confidence to put it on the air.
I'm asking ?80 for it and that will include UK shipping.
Photos available on request.

Peter, G8FWY

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This email has been checked for viruses by AVG.

I am afraid it is correct, although bothering. On 'USB bands' is the other way around, it shows 700hz above. So be careful especially during contests not to transmit outside the ham bands otherwise you would incur in a red card !!!

Hi Sascha,

Sorry to hear about the dead Teensies...ouch.

Fascinating problem. After reading you email a few times and to make sure I didn't jump to conclusions:

1. your "spy" connection towards the usb/TTL converter should not have the TX connected at all, only RX and Ground.

2. Could there be a possible ground issue via the power supplies of the PC and the uBitx. Try with the laptop on batteries if that is what you use as a computer.

3. When you say that "And i also installed a new level converter - the level is higher now." can you check with an oscilloscope? That should show you what happens when the power is applied to the uBitx.

4. The schematic of the Arduino Nano shows a 1K resistor between the D0(RXD) and the USB converter chip and the same for the D1(TXD) one, so your TTL level converter should be connected directly to the D0 (and D1) pins on the Nano, not through a resistor.

5. Just re-checking the schematic of the Arduino nano the built-in usb-ttl converter is always powered up, even if the usb cable is disconnected. So that may interfere if you have a (high) resistance between your level converter output and the D0(RXD) pin of the AT-Mega.

6. The normal idle state of serial TTL is high (if I am not mistaken) and the USB chip will pull the RX (D0) high through the 1K resistor, but your level converter should be able to pull it down to low level anyway (or vice versa if it's the other way around).

7. The fact that when you use your external usb/ttl converter with a PC and term emulator you get comms shows that it can be done (if I read your email correctly). What do you use for your Teensy to Arduino level converter?

Scratching my head on this one really..hihi. Let us know what you find.

73, John

Mark,
The 0.1 uF capacitor goes on the tuning pot between wiper and GND.
you can add a 100 pF capacitor in parallel with L7 to reduce the second harmonic.
--
Ion

VA3NOI

You will have to remove R60 then you don't need another blocking cap. If you don't remove R60 then
you need another cap.

Raj

Jim and all,

I found this board as it came from hfsignals not passing my tests. Even at lowered power out.

Howerver when I reduced the drive by RV1 and increased the modulation level (mic) the
Po increased and the spurs did not. RV1 came fully turned anticlockwise. Needs to be midway.

Raj

I know the calibration method changed from what is posted on the HFSignals website for the v.4 boards, so perhaps the new method applies to the v.5 boards. In the version 4 when you select calibration the rig goes into transmit on 10mHz (be sure to have a dummy load attached), and using a second receiver you adjust the VFO until the output shows up on the second receiver where it is supposed to be. It in interesting that many report that the calibration is about 1kHz off, as it was with my v.4 board. I wonder if there is an issue at the factory.

Note, if you change to the CEC software the calibration he uses is the original method where you are adjusting while in receive.

=Vic=

I should have mentioned, do not put anything in the "CW Freq Adjust Value" box. That will add to the offset you have already selected when you set the CW Side Tone elsewhere.

=Vic=

This bothered me as well, as the TX is offset by the amount that you have set your CW tone for. I think it might have been better to offset the receive in CW mode, and Dr. Lee has provided that option through the Memory Manager. Just select "Enable Adjust CW Frequency" as below and now your receive will be offset by the amount of selected side tone and the transmit will be on the displayed frequency when in CW mode. Note that this does not affect SSB modes and the transmit will still be offset if you press the CW key while in USB or LSB.


=Vic=

There is a dc blocking cap in the ubitx circut, c60, you don't need another. I used a pair of audio transformers to isolate the radio signals, one on the mic side and one on the input side to the computer.

Adding in dongle sound card in the ubitx seems to simplify the computer set up.

In Linux, cwdaemon and XLOG.

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Thanks k5ess

FWIW here's my version of the Easy Digi.? I use it with a USB sound card dongle and a serial port for TX control.
Mike
K5ESS

So I swapped out my lm386 thinking that I might have blown it. Now I get ALL the am frequencies. Any ideas on what to fix next? ?Video included.?

I am still fighting to get this working.

While installing the first level converter I somehow managed to burn the Teensy controller- so I had to wait for the new one.
In fact this project uses the third Teeny controller by now and is slowly bankrupting me :-O Though i have to admit the first kill was really stupidity by me
(wrong polarisation - no diode can help you if you wire up the power connection the wrong way).

First of all, thank you John. The advice with the serial monitoring via Realterm might have been the push into the right direction.
I have built a spy cable where i can connect my USB-TTL-Adapter to with RX,TX and GND to try to monitor whats happening.
And i also installed a new level converter - the level is higher now.

I tried reducing the speed to 4800 by changing? the following in ubitx_20.h in KD8CECs firmware as Gary suggested.

? Init_Cat(4800, SERIAL_8N2);
? initSettings();
? initPorts();???

I can connect with the slower rate now, but all in all it did not help me with the problem. The loop controller and the uBitx are still not able to understand each other

Furthermore? I noticed that, I can read out the frequency manually using the Serial Port Monitor (send in "0000000003" and the uBitx answers the frequency).
So to find out what the loop Controller is sending, i? switched the RX-TX lines on the tapping, where i am taking of the signal with my adapter.

And now the strange thing? is: There is no readable signal, as long as the uBitx is powered on. If i turn off the uBitx , I can nearly see immediatelly the "0000000003" which the loop controller is sending on the serial monitoring software to poll the frequency. But as soon as the loop controller is switched on again the signal is lost. Does anyone have any idea, why this is the case? I have added some screen shots.

Is this a mistake in my built, is it a measuring error or do I just understand something wrong? It seems as if the uBitx is sucking in the signal or distorting it so much that it is not readable anymore.
I could imagine that the signal gets pulled in because there are no additional resistors in line to the serial pins of the raduino, but I am not sure. But if this should be the reason, the problem is most probably somewhere else, right? As mentioned earlier if use a serial adapter to connect the PC directly it works.

Sascha

Dr. Ian Lee,

Your firmware for the 7" Nextion displays is missing MANY of the configuration options available in the other display sizes. Please see photos for example. Forgive me if I am making a mistake.

The image on LEFT is the 7" firmware as supplied. The RIGHT is the firmware for a 4.3" display which does have all the options.

?