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P.S. T3 is the reference designator for the BFO transformer in the original BITX schematic. john ---In BITX20@..., <iam74@...> wrote : There is no T3, either in the schematic nor

There is no T3, either in the schematic nor in the outline diagram. It is an error in reference designators. If I were to guess, in the original on-a-napkin diagram, A.F. included two full mixers

can someone show me on a board overlay where t3 is on the bitx40v3 smd board

I adjusted the connections so that when I rotate the pot clockwise, the frequency goes up. Both pots. I connected a 500 ohm pot in series with the 10K pot. the 500 is "bandspread". [BITX20]

Maybe I should call this post "read the directions"! After hooking up my BITX40 and turning it on, I noticed a couple of "problems". The volume control didn't do a very good job of adjusting the

Hi Todd, I am building the Arduino part as a separate PCB, the ATmega328P plus associated components are going on one PCB with an Si5351 Adafruit board, OLED screen, rotary encoder, buttons, EEProm

the initial stage of re-working my original through hole design in to a surface mount one and so am removing the VFO and BFO circuitry.<< Presuming you're using Farhan's schematic, he has the DDS

well i got it back but now i have very low audio output :) any suggestions i can receive signals just the audio output to my headphones is very low

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /Bitx-40p2 ver. KMK/Montaje.jpg Uploaded by :

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /Bitx-40p2 ver. KMK/Montaje Bitx40p2 112x83mm.pdf

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /Bitx-40p2 ver. KMK/Impreso 112x83mm

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20 group. File : /Bitx-40p2 ver. KMK/ImpresoBitx40p2 112x83mm.pdf

Ah, yes. That is a slightly different problem... The IF is determined by the VFO frequency +/- the BFO, not the nominal filter frequency. Note that you can get either out of the mixer and the

Thanks John I already have the 5351 running as a VFO and I may in the future also have the 5351 run the BFO. In my sketch I assumed that the "BFO" value meant 12 MHZ, the IF. It should be the actual

Thanks , Sarma VU3ZMV, I asked the group why it did not have a return from HfSignals Today I received the tracking number. Let's wait. 73, PY2ADX - Antonio

I am creating the PCB myself, it it not a pre-designed one, I am just at the initial stage of re-working my original through hole design in to a surface mount one and so am removing the VFO and BFO

It might take litte longer , but it would surely arrive. All the best sarma vu3zmv

Ken -- You don't really need to set up a DDS BFO. The on-board BFO oscillator is strong and stable. What you probably should do is adjust the BFO frequency directly to suit your ears. (See message

Three stations on the BITX 40 NET tonight N2CQR KB9MAC W3TTT I opened with my Icom at 100 watts, then switched to the BITX at 7 watts. I then worked W4QNW in South Carolina 550 miles / 875 km (with

I got it. I kept thinking the IF(12 MHZ) was the BFO. So it turns out my BFO is also 11.9986 MHZ. So if I have mine start at say 7.164 MHZ, it's o/p is 11.9986 - 7.164 = 4.8346 MHZ OK back to the