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Ah, thanks for that info Evan. I'll upgrade the polyswitch. I have them from 50mA to 8Amps here in stock. Still, I've not got my board going correctly. It is distorted and deaf so I think a mixer is

Since it is 1 amp, I assume that it is only protecting the board, and not the PA.? When on 80 meters, my v4 and v5 boards will draw 2+ amps total.? That would be close to the trip point of the poly

That is why I used a polyswitch. It is a resettable fuse :) https://www.mouser.com/ProductDetail/Littelfuse/RXEF110?qs=hv6pn79dJPSCD61RjaQM8g%3D%3D

I don't remember, Farhan has ever released board layout or its photo Sarma vu3zmv [email protected] wrote:

I would agree, as I too had a reverse polarity issue.? For me it was a left over HP power brick; HP has for some reason reverse polarity on the barrel connectors.? I forgot this and plugged it in.?

Oh, Raj, you were right about the red wire..? Thanks! Kelly K5AID

Well after a few hours of teardown and reassembly, I salvaged the encoder and the board. It tunes flaky, tends to jump around, very sensitive tune rate....I also was able to hear wwv on 5 mhz. It does

Hi, Mike. Thanks for reaching out.? I'll check out that YouTube tutorial; it's possible that I've seen it though a silent demo doesn't always reach me. I want to know why we're doing one thing

It sounds like a good idea would be to buy a spare Arduino to play with. I have a couple so I have a going one, and one to fool with. That is, I could play around with it before I hooked my uBitx V5

Yes, already tried that. The Raduino unplugged powers up with the USB cord, no black squares, just a blank yellow display. I tried compiling and uploading the Blink example, and same result, the

It sounds like the Arduino is blank or dead. Can you unplug the Arduino from the Raduino board and just load "Blink" to it to check ti is ok?

I recommend you do install reverse polarity protection. My v5 board now has a 1.A polyswitch and a reverse diode. I wish it did earlier!! For some reason, I thought I'd put that mod on later, and of

Thanks everyone. Def going to try the easy stuff first. Have tried multiple linears, ?mics, ?preamps, etc.

The 0.001 mfd bypass at the microphone cartridge was sort of standard way back in the early days of BITX. It worked then, so should be something to try now. Arv _._

Another question, what mic are you using?? A dynamic mic would need to be connected through an preamp or compressor and isolated from the electret bias voltage. I found the stock mic to not have

Is the problem only with the amp connected?? How is the signal running "barefoot". Since you have another receiver, I would load the uBitx without the amp into a dummy load and verify the signal

Martin, thanks, but the current problem is not the black squares, it is trying to upload Allard's sketch to the Raduino. The current error message is "programmer did not respond." Not a contrast

Dynamic mic setup does the same. I haven't tried a bypass cap.

Sorry if I missed your answer some where, but did you try adjusting the little blue Contrast pot on the back of the Raduino board?? It isn't labelled but is the only one there. When I first powered

Running an end fed with an air wound coax choke about 15 feet out from shack. I don't have any rf on my kenwood at 100 watts. Put ubit on linear at 50w out and still muffled. All wires have snap on