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Tony Most important is to not mess up dc power connection.? do you have a dvm? You can and should verify each connection with the ohmmeter setting. Most important don't make a short circuit between

Hi In my NEW SITE: How to program the DSpic for digital audio phase shift 300Hz to 3kHz (in portuguese) https://www.qsl.net/py2ohh/ 73 de py2ohh miguel

OK thanks. I've wired my ubitx yesterday evening and I've connected the +12V through a diode after the fuse. The S1 switch (on the volume knob is cutting the +12V. For now the PA PWR is directly

The Motorola Helge Granberg designs are almost 30 years old now. Keep in mind they are only engineered to the level that demonstrates the functionality of a part and since then there have been

What I am saying here Hans is that 0dbm is no use to check an Antuino unless we have a 20db attenuator. Calibrator will be useful for the Antuino between -20 and -80 Just like you are using a clock

Hi Raj amps The Question is - if the Antuino (or any other piece of test equipment) says -34dBm (for example) on its screen... how do you know the accuracy of that? This calibration generator

The whole kit (with display and raduino) or just the mainboard? 73, Mark.

Hi Jeff, Well that one really is just a CB amp -- the biasing not linear and uses only a diode (a design for CW and FM use) and the output transformer design dated (leading to low efficiency).? The

Hans, AFAIK the Antuino reads from -20dbm to -100dbm at the input. The IF amp amps the signal by 30db making the -20dbm at input into +10dbm at the AD8307. The sketch takes care of the maths. Any

I looking for someone in the Cincinnati area that can take a look at my Ubitx v5. ?I have it together, it powers up, but has no audio. ?I’m a total noob at kit building & a relatively new to hf,

I see that there has been a little bit of talk about amplifiers for ubitx. ?Motorola published amplifier designs which used their transistors a few years ago and a company named Communications

Use an RF probe or oscilloscope to trace the signal through the relays / filters. Clark Martin KK6ISP

Excellent line of investigation to follow.? Having replaced the finals (from Mouser) with predictably no change, I swapped out the Nano. New, known supplier, etc. No change. The relay power at K1 -

Jerry, Thank you; I'll try those steps. 73, Mark/WU6R

Mark, So, you measure 12v across the power supply and at the same time you measure 0.49v across the Bitx40?? Then somewhere there is 11.51v drop across a bad connection, you should be able to find

ThanksI'm using the resistors that came with the kit. At 81 I think I'm Loosing It.73Jim

I have a never used - never powered uBitx version 3 board available for sale for $50 plus shipping - US only. If you ever wanted a spare, now is the time. First come, first serve. I accept payment by

Hi Allison, i did get the prebuilt band pass filter from ebay.? Wondering if you have any suggestions to mod the KL-203 as well as how to mod it to be more sensistive to lower power e.g. from

I did get the KL203; not bad of course low pass filtering is required.? It works with 20m up. power mod is required and will make it once i get the caps 1200pf/50v for C14. For softrock no lock; SSB

Yes agreed. I got it but no luck - the power from softrock is too low to trigger the amp to transmit. Not sure if anyone knows how to mod it.? If I use AM,? it does trigger the amp. Sajid