开云体育

Hi Rod,? Did you ever get your low power issue resolved? I have finally gotten around to getting my UBITX V3 board done and on the air and I find the same issue as you have described here on this

Check (with an ohm-meter) for resistance to ground on generator ...Likely it has 50 ohm to ground ..If you hook that directly across the base of the transistor, you've just mucked up the bias on that

Yes, points connected to volume control are in parallel with existing wiring.? The relay and regulator are new, not the existing uBITX ones.?? Here is a photo of the mod that I made for mine.

Interesting thanks that is a good map to work through will try to trace. I noticed something interesting maybe it's expected trying to understand why though.? If I input a low signa from generatorl

There are pros and cons to each approach, which is why JackAl has both RF and audio AGC. Indeed, the AGC section takes up a good portion of the JackAl's nanoacres. BTW, we just received the assembled

There have been dozens of threads in this forum about adding AGC to the Bitx40 and uBitx. Most get hacked in (both detection and attenuation) after the rx audio preamp, to prevent ear damage on a

I had microphony that turned out to be coming from a poor fitting 8 pin audio cable.

I could only find link to complete kit, is their a link to just the parts ie: main board as it comes in a kit ? I did send an email a couple of weeks back to hfsignals but have heard nothing back...

Wow clever adjusting the bias on the pin diode. I assume that the points connected to the volume control are added in parallel to existing wiring? Where do a1 b1 a2 b2 c1 and c2 go? Is that the

Ok Bill, I think that solution may be temporary but it does not end with the problem. I have to continue investigating where the microfonics arises and how to solve it, because this effect is a

Possible, but unlikely ...As a first step tie the wire loop you wound thru the core to the input of your scope..measure the signal from tp2 to the scope across the bandwth you can sweep with your

Sorry. Did it again. Did not read the title.

I could only find link to complete kit, is their a link to just the parts ie: main board as it comes in a kir ? I did send an email a couple of weeks back to hfsignals but have heard nothing back...

This is a BITX40 board!

Make sure you adjust the pot that controls the backlight for the lcd. It goes from nothing to filling the screen. Careful adjustment is required to see anything. Also check that the raduino isnt

The 7805 regulator is not supplying power to the Raduino. When you plug in the USB connector, power is being supplied by the regulator on the nano board using power from the USB port.

I'm late to the disussion, but I'd load the Blink program to make sure the Nano is healthy, too. Jack, W8TEE

I would start with the simple and then go to more complex.? Verify that you have the Raduino board plugged in correctly. I noted on my board that the socket on the Mac n board looks like the last pin

The 47uF would be charging via the 10K resistor and that would take a second or two. Probably the cap was a little leaky. Just a guess!

Hi Alf, It is entirely possible for the vibration from the speaker to rattle the microphonic parts on the board. Remove the speaker from that equation by using an external speaker at some distance.