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I plan to use a variable bandwidth digital filter from SOTABEAMS ( details available here ( http://www.sotabeams.co.uk/variable-bandwidth-filter-modules-ssb-cw/ ) ) with my uBitX, which has an

Nice stuff, is it single layer? I am working on a double layer layout too. - f

The ubitx uses 8 crystals, not 5. they need to be within 200 Hz of each other. - f iam74@...> wrote:

One thing I forgot to mention...crystals age rather significantly in the first few minutes of oscillation. What I do is leave them in the oscillator for a about an hour (and measure the frequency).

Looks nice, Juan. I suggest that CM2KMK could manage two versions , second one being with smd diode packs as originally proposed by Farhan.. It would great if the pcb is single sided and facilitates

Thanks John - I think that gives me the info I need. ?Thanks also for the 'paradigm shift' that occurred when you reminded me that we can match the BFO to the filter. ?I've got 50 12 MHz crystals

"I wonder if the BITX 40 board could be used to build one?" [uBITX] No. Too many changes need to be made...primarily from the dual IF...though it would be an interesting project. I think you would

The #1 criteria is to sort the crystals by frequency. Use an oscillator and an accurate frequency counter. Be sure to measure them all exactly the same way. Choose the set of 5 which are closest in

Hello Jc,That is a beautiful pcb by Heriberto! 73, Larry K3PEG

I would remove the collector R and C and connect direct to bitx. Some value changes may be needed.

Stuff now just can't stray TH.? So you have to give! I do real well on 0603 now, and I am 71 years old. I do not do parts 402! Mike, WA6ISP

Good job! Just need to know how to purchase one..... Marco - KG5PRT

I hope it stays thru hole. I don't have much smd experience.... Marco - KG5PRT

I too am interested in the UBITX and would buy if it comes up as a kit. I wonder if the BITX 40 board could be used to build one? Bill W6SDI

Looking good! Roy WA0YMH wrote:

Hi Guys, here something my friend Heriberto-CM2KMK- is doing for the uBitx Have a good week end rv's 73's Jc

Theory question please? ? I'm preparing to sort crystals for the 12 MHz SSB filter. ?This will be my first crystal filter. ?I expect I may have to adjust things a bit as a result of the different

Nicely done.

Yeah; they'll work. And if you lay it out right and adjust some impedances, they are good to 6m or so. Assuming the transistors are genuine and not fakes. Watch out for spurious oscillations. Usually

pgooden2@... ( /g/BITX20/profile/288437 ) 5:11 pm?#23189??( /g/BITX20/message/23189?p=Created,,,20,1,0,0::recentpostdate%2Fsticky,,,20,2,0,4507240 ) Well, I