(tr)uSDX Forum

Hi Mike, Yes, in 2.00u when transmitting in SSB you can see the power in Watt and a number that represents the current PA bias level. If you set PA bias Max to 160 then you will often see 160 when you modulate. When you see 999, the input signal is overloaded and you should reduce the voice level to...

Hi Herb, Going above the 13.8V voltage put more stress on the PA class-E MOSFET and the voltage regulator. The LT6231 opamp is generally not directly connected to the input voltage and do not suffer from this stress. Even with 30V on the input the power dissipation in the 78L05 regulator is about 1....

Yes normal, you can hear the flash burn to save the frequency in memory.

Hi Cal, I am not aware that there are cat issues with js8call on Linux, and i have it running here. Can you share what firmware version you are using? You can use VOX and set the threshold with noise gate (lower value is more sensitive), but the recommended method is cat control. Did you try the lat...

hi martin,
just overwrite the text with new characters and fill it up with spaces on the end.

@oh2awx Hi Matti, Thanks for your contribution on github [1] to make COM ports configurable. Will integrate it in the driver, and it will definitely help people when COM8/9 is already in use. Question remains how to reconfigure the virtual COM port. @Magnus, virus scanners respond on the presence of...

Is RTS pin of CH340 still used for CW keying in 2.00u firmware?

Yes, RTS is still used for keying the rig, only in CW mode.

Thanks for this contribution. Will give it a try tonight and possibly we can extend this a bit with com0com support and audio in tx direction. In this document https://pypi.org/project/SoundCard/ there are some hints given to reduce latency and smaller buffer sizes. Another trick could be to increas...

All, CAT streaming allows the (tr)uSDX to send audio over the CAT serial interface to/from the host, removing the need of audio cables while operating digital-modes from the PC, while still being able to operate CAT. On the host, an application is used to connect (tr)uSDX CAT streaming to digital mo...

A speaker howling effect may appear when using the internal speaker and volume levels above 12. It is caused by electrical and mechanical feedback from the speaker to the very sensitive receiver circuitry. The recommended solution is to use an external active speaker as proposed in this video https:...

Yes, at a drive setting 8, the (tr)usdx is generating a ssb signal with constant amplitude. When there is no modulation, the carrier is switched off. This is controlled by the noise gate threshold setting. Changing three noise gate setting from 4 to 0 will disable this behavior and never switch off ...

Ok tnx Bill I have no idea but will dive into this to see what can cause this.

Could it be that the Windows audio mixer settings are such that it passes the receiver audio to the sound card speaker output?

and then activating the VOX with this receiver noise?

Note that in VOX TX mode buttons presses are not effective.

Hi Bill, I am unable to reproduce this on the latest beta version, but we had such an effect in an older version. Could you please confirm you are using a version older than R2.00c? You can find the version number in the menu or is visible on startup. In addition. can you confirm that ATT is set to ...

Bob, Janko, Thanks for your feedback on this topic. Please try the changes in beta version 2.00m (see bottom download page). Here, the CW message is always sent, even when it does not start with CQ. The beacon interval is now increased to about 4.5 minutes (255 seconds). Let me know if this suits yo...

Many thanks!
I have added a link on the Operational Manuel page to your gist.

Thanks for reporting.

You are correct that iambic a did not came back properly after a power cycle.
In the latest beta (2.00L), as can be found on the download page, you can find a fix for this issue.

Can you please confirm it is working now as expected?
Thanks.

Hi Derek, Thanks for reporting this. Yes, I can confirm the two birds around 14.287 and 3.670 MHz, and this indeed can be disturbing when tuning over the band and yes it affects the AGC around these frequencies. We will need to analyse this to find the source of this spur generation. It could be the...

Hi, It looks like you are using WSJT-X under Linux. Please be aware that the RTS/DTR settings are not effective under Linux, and keeps resetting the rig. Please try the following to resolve that issue. - before starting WSJT-X please execute the following command in a terminal: stty -F /dev/ttyUSB0 ...

Hi Dale, Great to hear you enjoying the rig and thank you for looking with more detail into the receiver behavior. This feedback is much appreciated, and I am happy to work with you to see if we can improve here. Yes, I think the AGC can be made even faster to prevent overshoot. However, making it f...

Hi Dan, Thanks for congrats and reaching out to us. It would indeed be great to have Pocket RxTx support for the (tr)uSDX. The (tr)uSDX is loosly implementing the TS480 CAT protocol [1]; make sure to keep DTR stable (as it is used for resetting the rig during programming). RTS is used for keying the...

Hi John, No opposite sideband rejection and image rejection is generally be about 50dB, so it's not expected what you are seeing. You can test opposite side band rejection by listening to a strong USB signal and then switching to LSB, the signal level should degrade about 50dB. The same for tuning o...

OK. Does it help, if you try to do a factory reset of the settings? (hold encoder button while rig is powered on). It s very strange that the relays are not working. You should check if the VCO is oscillating on the advertised frequency. If not, then some device on the I2C bus might be defect, and i...

Ok.

Did you do bootloader and fuse settings over ISP. Can you confirm that the fuse settings are as described in DL2MAN web site?

Thanks

Hi af7ux, Sorry to hear what happend. In this case it is absolutely important to make sure that the microprocessor is replaced with a genuine atmega328p or atmega328pb chip, and not one of the clones circulating. Some Arduino Nano boards carry a fake/clone 328 installed that are missing some essenti...