开云体育

FYI, I posted the LTSpice schematic, so you can analyze if you wish.If there's interest, I can post the whole LTSpice package if anyone requests it. Joe

That’s probably radio frequency interference. With a slightly Squirrley antenna, you may have RF pick up in microphone cables etc., leading to all kinds of weird behavior. it will look like the

Hello! Finally I made a few first contacts with my uBitx. Mostly I used the antennas at my local ham radio club, which has dipoles for 80m and 40m and a beam antenna for all the upper bands. At these

If your rig still has the M1 and M2 audio cutoff connections to relay K3, then what you are hearing in your audio is not a transmitter issue, but an RF overload condition from the TX output back into

You folks are all saying "carrier leakage". I thought that as well when playing with my rig. It turned out, in my case but I expect yours as well, it is not the carrier but the unwanted sideband. This

Hey, very cool Glenn!!! Also, now I understand what you mean about mounting the relays on the backside. Great work!

the kdcec manual says that it can be set to any ham band does that include the 60 mtr (5 Mc/s) band terry gm4dso

Here's another take on the PCB for the extra LPF switching relays. As per my previous suggestion, fitting the PCB to the edge of the uBITX main board by seam soldering them together. This preserves a

Hi Allison, Thanks for the compliment on the picture. It's a pretty straight-forward Breune bridge, but I'll put up the schematic when I get a chance to edit it with actual values...maybe today. The

Jerry, Thanks again for ur reply. OK, 3 Nanos are on the way now and I will order another 3 Nanos so I can try 6 of them this time. Yes, I know that I need Nanos without pins soldered. Maybe

Ok.???? Guess I am a bit long in the too but i grew up with 4 band coding......the last being tolerance.? These resistors are five bands hence the error on my part.? Also the first two bands

You means spectral purity around the fundamental or the harmonics? Listening to a few hams on VHF, having an SDR receiver, my impression is that around the fundamental they were not very clean. I have

Hiro, I would think with 3 or 4 Nano's you would have one without the objectionable tone. The processor clock frequency is determined by a 16mhz ceramic resonator which can be off by perhaps plus or

Many thanks, Jerry. It seems that my issues is the same one discussed at the thread you pointed out. I happeningly ordered some extra Arduino Nano for my another projects, so let me try to switch

Hi, I wan't to build a filter I can use with the uBITX. However, I don't want to build a filter that is strictly tied to the uBITX.? So I'm building a standalone Low Pass Filter box that will work

I barely know how to do this, but I uploaded the design document, and the zipped gerber files (which pcbway.com was happy with) to this github

Here's an old thread about audio tones in the receiver, possibly due to beat notes between harmonics of the 12mhz bfo and the 16mhz Nano processor clock. ?

?Hi Jim, Allison already did that for a motley crew of raidos, including a Heathkit HW-100 and they all were good to go except I think one reallly clunky design. The general thing was that most

Put decent RF devices in uBitx and then we compare for sure... Rahul VU3WJM

Hey, I'm just curious how all the other portable radio compare.... Are they :"clean"? Specs can be that "special" radio, just for testing. Your mileage may vary, Jim W0CHL