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I am pacing the house waiting for my Bitx40 to arrive (we. Should be mere days away now) and looking over the build plans. I am looking for some clarification on the 12v power. From the power jack do

Hi Peter, Thanks for this forwarded message! So I noticed my first mistake: crystal filter has ~200 ohms Zin/Zout - not 50, as I thought before. Ok, so that means, attenuator has right Zin/Zout,

Rafal, John posted this in Feb. If you have not seen it it may be of interest to you. Yes, it is good to try to make improvements to a design. Best regards, Peter VK1XP

Sorry, calculation error: For a range of 400kHz we would need 3 extra bits, so we would need to take 4^3= *64* samples and average the *64* measurements. The expense of this approach however is that

Another idea to increase the frequency step resolution would be to use "oversampling". The nano's ADC has a 10-bit precision, this gives a range of 0-1023 steps for 50kHz. If we want to cover 200 kHz

Hi Peter, Thanks for reply! Sure. That's clear and even more - that's the whole beauty in this compromise design that it is so simple and it works! :-) But... even in such simple design, if there is

People had used smps for HAM psu. here is a possible link. http://www.electronics-diy.com/electronic_schematic.php?id=900 by xq2fod the Chinese make MW and others can be tried but with a toroid

The windings of T7 would have got damaged with high current, the trifilar would have shorted. Try a rewind!

Diz gets them directly from micrometals. - f

Jack Is there a group for discussing the analyzer? Wondering if any other component adjustments were required for the MAR-3SM+. Regards? Simon VK3ELH

I wish to use switching power supply. because I don't have power supply yet. but I can find to buy cheap switching power supply. I had know that the switching power supply make a lot of noise. So I

I am not sure that would be possible, as the ultimate frequency step resolution is determined by the A/D input - 1024 steps maximum. The only way to cover a wider range would be to change the step

Your code seems to work beautifully. ?Thank you. ?And for some reason I didn't even realize the double slashes there when I read through it. ?Possibly because I was reading it on my phone at the

kits and parts indicates AL for FT27-43 at350 +/-5%. possible that that they indicate AL at 2MHz ? we need to check with factory information. Link below shows more varieties of cores from other

go to sketch, then include library, then manage libraries. ?Search for si5351. ?choose Etherkit si5351. ?Make sure you choose version 1.0.0 ?That is how I got it to work.

I guess the 7805 regulator that provides the bias for the transmitter is blown. are you getting bias on the gate of the IRF510 when you press the PTT? - f

Trace the track from IRF drain through L8 I am willing to bet L8 is fried or track burnt. If your 10A fuse blew then the PCB tracks didn't have a chance! From the drain to the power pin at PA power

That is one slick rig!

there's a 5 v regulator-U3 next to Rv1. Carefully check for output on U3. Also maybe the Rv1 got fried. If you replace Rv1 put a tick mark where the old one is set or measure for ohms. You need a

Hi In this directory </g/BITX20/files/K7AGE>, you will find my table of transistor voltages and schematics highlighted for receive and transmit signal paths. Hope these