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Harvey, Disconnect the power wire to the PA, i.e. center wire on power plug and then make measurements. I suspect that 400mV is the L5 picking up PA signal. The level at L1 which is input to PA I

Jon V3 has the TDA audio amp. V4 has a discrete transistor audio amp. New V5 has a LM386 audio amp, and some new refinements including a different 2nd IF. All factory versions are supplied with IRF510

Jon you don’t say when you received your uBITX. If our board has the discrete transistor audio amplifier then yours is a version 4 and the 2018 schematic is correct. There was a long thread about

I have 2 Raduino's that were removed from working bitx 40 radios for sale.? $60.00 shipped CONUSA only for the pair.? Both have original software.? one has original 90 degree pins the other has

I have a 2018 and a 2017 schematic and neither match my radio. 2017 layout has a TDA2822, my radio does not. 2018 layout has RD15HV1 after the IRF510, my radio does not. Is there anyone have an

Hello Sascha, It should work "in theory" without a level converter (but it does not hurt to verify). Reason being is that "A TTL input signal is defined as "low" when between 0 V and 0.8 V with

So, after googling a bit I think I have a suspicion. While the Nano in the Raduino is a 5V System, the Teensy 3.2 runs internally on 3.3 Volt. Then with the additional 1k resistors in the Teensy RX

Hi Will, The youtube video? https://youtu.be/fxquxqv7fAA Has a link just below in the message pull down area. http://www.hamskey.com/2018/05/ubitx-firmware-cec-version-108-release.html?m=1 Where

Hello Sascha, One good news is that you have a USB-TTL converter that works and that it talks to the Arduino. Based on the above my first thoughts about the issue are either the option selection in

They have the same dimensions and a V5 will physically fit in the same box as a V3 or V4. You cannot use the Raduino from a V3 or V4 in a V5 as is, but they will work if you load V5 software into the

Jim, thanks for running through these results and posting them in as unvarnished a way as possible. :) It certainly helps those of us who don't have access to such a nice SA to see how things are

On the bright side, the 45 MHz into the final mixer spurs seem to be cured on this one sample. Are the relays same make as v4? I understand they are arranged differently on the schematic.? Maybe like

Mike You will know best.? Certainly the objective was to keep dimensions the same. I trust this was achieved. Curt

Group, I just got a V5 in the mail today in hopes of just removing the V4 from its box and swapping the main board and the Arduino and display. Is that possible? Thanks Mike WA3O

Jim, Run the test for power out at 28.4mhz? but sweep from 12 to 30mhz.? Above 20mhz harmonics are less an issue than spurs below 30mhz.? One of the big issues was at 10M there would be a strong

So, to give some feedback. I do not have any positive results yet. The controller is built and finished, but I am not able to control neither my IC-725 nor the uBitx with it. Nevertheless I am not

Tim, Yes, I know they don't. I ran the tests for the second time to make sure I got the test settings as close to right as possible. I didn't expect any seriously different results. I also

Jim, These graphs don't show much more than the earlier ones. 2nd harmonic on 80m and 3rd harmonic on 40m/20m need to be investigated. A low pass filter for each band could fix these but it would be

Today i receive new Si5351 and output signal on CLK2 is 1Vpp. The old Si5351 is not working properly. Miroslav? OM6VM

Hi Jim Have you run these tests on any other radios yet. Say your k3? Something that is supposed to be top notch. Sounds like a neat tool. Dave