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Hi John, ? ?I appreciate your comments.? I agree that the first option isn't going to fly.? I saw the changes in the noise floor but at this point in my 'crystal kindergarten' I don't grok the

Hi Cor, I can confirm. Just use the building blocks needed to receive. I'am building the uBitx from scratch and have been playing around with the receiver quite some time before starting to build the

The Si5351A is on the Raduino board itself. Under the LCD.? It's fairly tiny. The LM386 is in fact the audio amplifier. No harm to be done by carefully resoldering those couple of pins, although this

Looking at the schematics, that appears to be LM386 - low voltage power amplifier. It also appears that the SIS chip is on the raduino itself. So, I'll look there for it. Could this power amplifier be

Got a tracking number Dec 12, package picked up at 17:17 in Hyderabad, went to Bangalore, Leipzig, Cincinnati and Los Angeles by 06:37, 15 Dec. Must have gone on vacation as it arrived in Honolulu at

Ok...I checked again. This time searching 4.925 as well as above and below it. I didn't find the signal in LSB mode. I looked for a 10 legged chip and didn't find one. I did, however, find an 8 legged

Here is the relevant subroutine in the 7025 KHz sketch: void setFrequency(unsigned long f) { // Want to tune to 7075 kHz // Intermediate frequency is 12 000 000 // Needed VFO freq is 12 000 000 -

?The reason 12.000 MHz is important is that this is the crystal filter frequency (roughly) --- so the purpose of the VFO is to create a frequency that when added (or, subtracted one way or the other)

Here's the datasheet for the Si5351: https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf? Looks like indeed it comes in a 10-lead surface mount version. ________________________________

"It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked for it about 200 below and 500 above 7.025 mhz Isn't the Si5351 just a chip? Can't I just replace

Here's the sketch again--- it should generate a signal on the Raduino at 4.925 MHz ________________________________ Sent: Monday, December 18, 2017 8:34 AM To: [email protected] Subject: Re: [BITX20]

That's nice, Andy. But look at what happens to your noise floor in the third instance. The first instance shows a peaks and lows over a 5+ dB range, perhaps a bit too much for a good filter. The

It's a Yaesu FT-891. With the regular sketch, I looked for it from 4.8-5.5 mhz. With yours, I looked for it about 200 below and 500 above 7.025 mhz Isn't the Si5351 just a chip? Can't I just replace

" Make sure you understand how RV1 works. You wrote:It's true that I did move RV1 and RV136 before. I just checked to see what they were on when I obtained these readings and, as I had thought, they

I've already adjusted it to .10 amps Yes.....I turned them fully clockwise to turn them all the way down. I've since turned them counterclockwise to increase them and am now at .10 amps

?When you get the chance, can you give us more specifics on how you connected your communications receiver, how you hunted for the signal? On what frequencies? If it truly isn't there --- andyou CAN

KD8CGH These might be interesting. https://www.smashingrobotics.com/arduino-simulators-lineup-start-developing-without-real-board/ https://sourceforge.net/projects/simulide/?source=directory Arv K7HKL

Make sure you understand how RV1 works. You wrote:It's true that I did move RV1 and RV136 before. I just checked to see what they were on when I obtained these readings and, as I had thought, they are

Ok, I tried both farhan's sketch and Gordon's. Neither produced a signal.

I still have my K&R "borrowed" from my company's tech library decades ago. Return was made moot by the library closing. However, I did return the Knuth.? I also have several of Jack's books I bought.