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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

Did my best to ohm out the traces and checked web based data. Pinout of K1 is the same as a 16 pin dip with the same spacing so some pin counts must be skipped. Pinout for bottom view of K1 (Easy to

Just out of curiosity, Ash, why are L8 and L9 separate? Is it topography or is there a reason not to use an UNUN here? john AD5YE

That QST article suggests the return loss might not be acceptable across more than one band. ?The topology agrees but Ashhar's values differ significantly from those recommended, might be something

Paul, Ashhar, please correct any errors in my message. I believe the two lowpass/notch filters used by Ashhar in the transmitter output are based on the the W3NQN filter design described in the

Mr Ashhar, Would you consider providing a list of the ?winding details ?and cores used for the ? Ubitx ... Regards Marc 'Gw0wvl'.. Sent from Yahoo Mail on Android On Fri, 3 Mar 2017 at 5:58,