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While you do not have the dataset for them you do have the filters. The solution is the empirical method, measure them. Allison --------------

There is a lot of old design copied.? THe whole TX chain is the uBITX V3/4/5/6 repeated. I have a very long memory. The Rs and Cs are going to be there if opamps are used for filters. might make a

Hello, watching this video, I realized that in fact the quartz and 2-pole filter components don’t seem to exist in LTspice they have to be simulated? (Theoric shematic), which complicates things.

excellent jaytee, good luck Art ________________________________ Sent: 14 September 2022 14:02 To: [email protected] <[email protected]> Subject: Re: [BITX20] Nextion screen update error message Thanks

ok Howard , see how it goes.. could be good. am waiting on a new nano in the post.. ________________________________ Sent: 14 September 2022 15:06 To: [email protected] <[email protected]> Subject: Re:

Allison: This kind of back-of-the-napkin kind of stuff just amazes me. I wanted to be an EE before I got my ticket in 1954. However, my HS counselor told my parents I wasn't smart enough to be an EE

First all Bipolar transistor have a DC offset between base and emitter usually about .65-to.7Volts. What that means is if the input to Q8 is resting at 6V the emitter of Q10 is now down to 3.9V and a

Paul, From the output of the filter (LC) to the antenna about 60db. Its easy to figure 5W is 33dbm the output of the filter is about -30dbm so you need actually about 63db of power gain to get from

Art It's on the HFSignals.com site as I remember. I'm going to put in a brand new Nano today and try uploading Nitin's sketch to that. ?If it's a corruption issue, that should avoid it. 73 Howard

. Hint make Q9 a 2n3906 (PNP) and flip that stage over to reduce the DC offset by one BE. Allison, can you please explain what you mean by this statement. Sent from Mail for Windows Sent: Tuesday,

Hello, *This is the first time I use LTspice and as at the beginning with Kicad I struggle.*.. Maybe you have already done this test in LTSpice, that’s why I go through the Ubitx forum at first.

After disconnecting form antena noise persist , References below...how to fix the noise? What is the cause behind the noise? [email protected]> wrote:

Ok sir I will test that

Thanks all, I installed the correct TFT file and voila like magic the screen is working. :-) Now to figure out how to get the SR/PWR meter working. I figure that’ll be another thread i itself.

Dear Alan, The 5MHz trap was made from a T50-2 core with 33 turns of #26 wire in series with a 250pfd to ground.?? The coil input lead was put on the mixer end of the 7MHz band pass filter.??

Is there anything else I can try?

Your English is extremely good and easily understandable Paulo! God bless, Bill (G6ATO)

Excuse me, I speak terrible English! The Fahran's project has no flaws: it is simply perfect. But in Italy we say: many roads lead to Rome: that is, there are different ways of solving a problem,

Hello Dave, Thank you for developing the wwv trap ! I missed the part of the detail of where you added that to the circuit, and its construction. could you send more info on the trap please? thanks

Again on TX : what is the total gain of Q11, 12, 13, 14, 15 and 16? Yes, 6 transistor from SA602 to IRF510 !! Can? amateurs builders still having a working circuit measure it and tell us? Thank you!