Nick, Put me down for 2 boards. thanks and 73 Evan AC9TU

#ubitx #filters #parts

Check on this thread, as the calibration procedure changed from the v4 to v5 software. https://groups.io/g/BITX20/topic/30236125 Note that the new process with HFSignals' firmware does go into transmi

#calibration #ubitx

You can also follow this thread, as he is having the same issue. https://groups.io/g/BITX20/topic/31971766#69562 Having been on this board for over 6 months reading every day, I can say that there is

As Ashhar stated, RV1 can be adjusted to lower the drive to the finals. Be careful on adjusting back up, as you can overdrive and have distortion in the signal. i would reccomend that you measure the

Without a way to measure RF it will be a challenge. I would look into an oscilloscope, one that goes up to 100MHz as your next investment. It can be used to measure the clock frequencies that seem to

Sam, can you fill us in on what test equipment you have? I would start by measuring voltages on the RX tags listed in th3 schematic. I would then try supplying a signal to the audio section (sometime

I would check C261. It may have shorted. That is the only way I can see to get 12v on pin 1 of Q94. note: you can replace the SMT with through hole devices if you bend the leads right, and are careful

I had a similar issue with 2 of my v4 ubitx. Traced the problem to RF on the coax shield that I resolved with snap on ferrite chokes on the coax to the antenna. The antenna is an off center fed dipole

Since it seems to be intermittent, I would first rule out RF getting back into the rig by transmitting into a dummy load rather than the antenna. The dummy load will not radiate as much RF to mic/ptt

I had registered, and forgot about it. Nice to have, however would not spend money on it.

#poll

I see that the schematic has been updated from the one that I had. The trick that is being used is that the positive is on the barrel, and the negative on the pin. Most (except for HP) barrel power su

First off, I do not have an Antuino (yet, waiting for availability after June 1), however have done some research into barrel connectors and I am pretty sure there is an error in the schematics provid

HFSignals web page: http://www.hfsignals.com/index.php/antuino/ has a brief description. Also, Ashhar posted a pdf of the basic schematic in message #63028 . https://groups.io/g/BITX20/topic/28870627#

This looks like a BFO adjustment issue to me. I believe that the carrier is in the waterfall as well. Another possibility is the balanced mixer with T7 and D5 may have issues. You could have a filter

I have used the SDRPlay as a SA, and had some challenges. 1 - First of all, the frequency span was not big enough to measure the harmonics on 40 meters in one test. You need to change the center frequ

That seems to be a common problem depending on antenna and antenna connections. I had similar issues with an off center fed dipole and RF on the coax braid. Fixed it with snap on ferrites on the coax,

When ever you plug in the USB port on the Raduino Nano it will power the rest of the Raduino including the display. The main board is not powered by that usb port, so no sound. You need to supply the

#ubitx #ubitx-help

If you want to build from scratch: https://www.maximintegrated.com/en/app-notes/index.mvp/id/621?gclid=CjwKCAjwndvlBRANEiwABrR32HIAgCd0XiHWPrfMf9p1y_aZAZpPVVTB46osHNQCah1GIGUB4PiRJBoCmnYQAvD_BwE Other

I really like the idea of taking the antenna connection and jumper to each of the inputs to the IFs, That is a low cost white noise signal generator. Let us know how that test goes. 73 Evan AC9TU

#ubitx-help #ubitx

There is another thread on Groups.io that follows a similar problem. The pictures of the clock signals as taken on TP12, 15 and 18 are on this post: https://groups.io/g/BITX20/message/63509 When you g

#ubitx-help #ubitx