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Once we know the L values, we can manage winding and check with digital LC meter. mini ring core calculator downloadable here can well be used for getting rough turns.we can wind a turn extra for

I had a similar problem and found an isolated earphone jack so the metal enclosure presents no problem. Sent from Mike's iPad WA1MAD

Does anyone have any winding details for the torroids for the UBITX .... Thanks . Regards Marc ?'Gw0wvl'.... Sent from Yahoo Mail on Android

The stable audio is best achieves where all grounding is brought to a single point. This star configuration of audio wiring is recommended as the gains can be pretty huge and even a small run of wire

I couldnt use the Elsie as Linux wine emulator crashes when i run it. I used the good ol LTSpice starting with a standard low pass filter and modifying it with the capacitor to create the notch. The

Jerry, I am pretty sure the component values used by Ashhar for the transmit filters agree with this article as I used to ELSIE program to display the frequency response using the values listed on

I will leave it up to you guys! I am happier with a soldering iron than a pen !! Cheers Raj

I wonder why the earphone jack must not be grounded? When i measure from speaker (minus) to ground there is connection. I plan to install in a metal case an mount the jack in the front.

Tilman you can ignore this warning. If you want to disable warnings with printLine function calls you could try to use statements like this: printLine2( *(char *)* " ? ? ? ? ? ? ? ? ?

Thanks, Rai! What is about adding this note to the wiki? There are some very helpfully posts on this list. It would be nice if we would find the tips and tricks on the wiki,

Ron Thank you so very much. I changed for version 1.1.2. After a "verify-run" I still get a number of varnings though. I have not changed the code, so all is the original-code to start with. The

Just to be obnoxious: ?Mostly right, though not absolutely right. ?Voltages at K1-14 are around 200mv rms max of 7mhz during transmit, 1n4148's there would not conduct more than a few microamps till

Al is absolutely right. You can't put a diode in the transmit circuit. It has to be on the antenna side so that it doesn't conduct during TX. As noted, this is to protect a rather sensitive Q13 from

Hi Sandeep jee, ?The capacitor under discussion is for carrier removal and Audio in/ out can happily work even with 0.1uF value, I suppose, sir. sarma ?vu3zmv

The diodes are to protect Q13's base from strong signals during receive only, the diodes shouldn't be connected to Q13 in transmit (Q13 is a transmitter pre-driver). Using the K1 pin numbers shown on

Farhan Sir, C107 gndref near BPO mizer xfrmr .1uf seems typo to me, will it be .001 ? > -- Please encourage recycling, reuse or repairing of E-waste. ?7?3? ?d?e?

Damb you Ashhar... now I have another project to add to the ever growing list.... uBitx looks like a very interesting rig, I am sure it will evolve a bit in the next few months so it is probably lucky

"So my question is should the diodes be from pin 12 or pin 14 of K1 (or does it matter as the two are connected in the unenergized condition)?" It doesn't matter. You are protecting the RX input from

OOPs meant to say? "The attached photo shows the diodes attached from Pin 12 to Pin 16 (K2-14 to Gnd) and two wires for TX LED (pin 1 to Gnd)." Pinout also got reformatted hope below version is

Hi all, I am still working on my BitX40 v3 and having a great time! Thanks to everyone for all there help in my debug so far. Quick question. ?I have the schematics but is there a complete