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Hello everyone.. I have some problem with my mic pre-amp.. The voltage from 4.7KOhm resistor suddenly drop to 0.130-0.132Volt after I connect it to the mic electret..? Is this normal? I've put my

ps I didn't fit the MPSH10's in this test. vk3pe

Hi Nick, yes close to AUD$11 here plus postage. I did a few tests on my uBITX today. *It started off totally stock.* I measured the power out (CW mode) and then added the 220pF caps and some other

If you build per the plans and don't happen to have a fuse on the power supply, there is no reverse polarity protection. Search for "reverse polarity" in this forum to see the various threads. Here's

Thanks! I send you replies :-)

Only problem is the 002 is 10x the price of the 202....

If you built it per the plans with the diode across the power jack, you may be lucky and just shorted the diode.? I've replaced hundreds of protect diodes in various mobile equipment with no further

Bill do you mean you fitted it for the power feed to the finals instead of the Chokes? glenn

Hi! I feel we should give BFG591 a try, they are modern devices , easily available with online suppliers and more compatible with the SMD construction of uBitx. There is plenty of headroom where Ft is

To be honest, the ubitx represents approx. $80-100 in parts, with labor and shipping determining the final cost. A profit-motivated manufacturer couldn't sell $80-100 worth of parts for $200 - it

Actually I just tried/ wound a BN61-002 and it seems to be the winner so far.? Doesn’t heat up at full power and is extremely wide banded… ? *?* *Dr. William J. Schmidt - K9HZ* ? ? *From:*

Hi Nick I have provision to try the feed balun on my PCB. Will do at some point. glenn

You will have re calculate and rewind the output transformer because all the calculations of this transformer depends on the operating voltage. As you are going to increase the voltage on the IRF

I totally agree with the ideal antenna installation. But at this time where I live, 19 foot apex of an Inverted vee with the ends suspended at 8 feet is the best I can do. And with the BITX 40, I have

We are all glad you like it! Do write in about the mods!

Rogerio I just sent you a private email discussing possible wiring errors regarding the Raduino wiring diagram. I am going to redraw the image to make some of the connections more obvious. Arv _._

THanks GLen. I was about to suggest using dual bn43-202 for the output and power feeding... should be easy enough to fit in the existing board... Wonder if it will be better to do this or a bifilar

I'm taking the approach of a mod to the board to limit voltage to the audio amp to 8V. (3 terminal regulator lm7808). One cut in the right place and mount it to the back of the board.? Then the amp

Rogier, Don't know what of the flavors of software you are using.? That pin is used as a digital port and the internal pull-up enabled in the 'factory' software posted on github. One of the ways to

That is consistent with my testing. The 2n3904s are marginal for power and FT. So it shows a higher FT device that can run at more power helps, 2N3553 will do both.? Other choices would be 2n3866 and