开云体育

Allison Sounds good. Then for the power challenged one could put the LCD backlight on a push-button so it would only be on when needed. Arv _._

Tim What in the world are you talking about?? Sounds like your reply may be to an old post from 3 or 4 years ago.? Maybe you responded to some other discussion group but did in on the BITX20 group

Try this for the existing 20/17/15 LPF? ....make the three coils all 350nH with a 47pF in parallel (easy to tack on), the capacitors at the ends are both 220pF, the other two are both 360pF. Like

Thanks Nikos.? I ordered some new SD cards to try.

a series LC trap on the filter output might work but only if the trap has very low? resistance and if it is exactly on the spur frequency.? Even then LTSpice simulations? indicate that a couple of

Try with another SD card I changed 4 cards .

Thanks Joe.? I tried 2 SD cards I had but I have used them many times in RPI projects so I have ordered a couple new ones.? For power I tried USB port on PC and 5V 3A supply I use with QRP-LABS U3S

Thanks a lot Pat.? I found the cable on Amazon and it is on it's way.? I very much appreciate your input. 73 Vince N1VIN

I am not home and it has been a bit since I did it. You will need an ftdi usb to serial cable ($15 or so) Connect it to the computer USB port and the other end (4 pins) to the 5v, grd, rx, and tx pins

Arv, If using an external filter box and the uBITX internal filters remain in place,? it seems that the external filters would only need to be activated in transmit? mode.? That could save some

Timothy, What is a bitx20A??? Also I made no assumption any Bitx has a Class A amp most builds I've seen would either oscillate or melt at 1-2 A no signal drain current.? ? Most people run them

david.g3ryp <david.g3ryp@...> 06/20/04???#30??( /g/BITX20/message/30 ) A recurring question.? So basics... The IRF510 is a power MOSFET with max ratings of 5.6A, 100V, and 43W

Thanks Pat.? Sounds like a great idea but not sure I know how to do that.? Would I cobble together a USB to connect to the 5V, RX, TX, GND?? At this point the display is not connected to the

Hi Allison, Yes, with LEDs the LCD would not be needed. The code should handle latching relays. In my case, that may depend on what I find available with prebuilt filter switch boards. Unless I do go

Never out of the box it came in. There are a couple of knobs and a 4 prong mic plug and socket. I have $69.00 in it and want that back plus shipping conus.

If using an external filter box and the uBITX internal filters remain in place, it seems that the external filters would only need to be activated in transmit mode. That could save some power when in

You could try downloading directly to the display. It’s slow but it would tell you if the display or card is bad. 73 Pat aa4pg

Gordon I have been playing with simulation of the 15 meter spur problem. It seems that a series LC trap on the filter output might work but only if the trap has very low resistance and if it is

Good points.? Bill, Yes, it will switch when it sees a new frequency outside the band it is on. --- Gordon, Hope the code is able to help you get a start on your project. --- Howard, I have a

Hi, I have seen this issues several times 1. Make sure your power source is good. 2. Try another microsd card. Usually one of the above clears the problem Joe VE1BWV