Since the IRF510 heatsinks are getting very hot very quickly right after turning on the radio - I am afraid to keep the radio on and potentially cause more damage. I am currently thinking of

if the signals have fallen from the waterfall, that means you are unable to receive. IRF510s may not be involved. Are you able to receive SSB/CW signals? You should check your audio cable. - f

Check the supply current to the PA with a meter. If it’s significantly higher than the idle current, say 250-300 mA it’s probably damaged. To be sure, turn the bias pots to the full clockwise

I might have broken the IRF510 MOSFETs with FT8. This problem started during a longer sequence of FT8 transmissions - abruptly all signals disappeared from the waterfall. The heatsinks used to get

At first I wrapped a barrel chock on the wires of Nextion. It helped a little. The I put a .01uf on the blue wire of Nextion and ground and that stopped the key from sticking. Joe

Hi Curt. I had to prove it to myself using a spreadsheet when I started reading these, dBm or dBV doesn't matter when comparing peaks within one spectrogram. Here's my math proof using the peaks

I didn't follow the link but You might try a torrid on the orange line and/or between the raduino and nextion.

My concern is whether we are measuring a power ratio or a voltage ratio - I am suspicious we could be measuring the latter -- see https://en.wikipedia.org/wiki/Decibel#Voltage I am thinking that if

Well, the AD2 is really a (software defined digital) scope with FFT ... so the front end is a scope front end, the probes are high impedance voltage input. Therefore the display is relative to

Thanks Sam! Sent from Mail for Windows 10

I bought one for my bitx40 they work out very nice. I take the element out and put it in a mini mic. http://www.jlielectronics.com/microphones/com-mic-jli-52b/ -- David

https://ubitx.net/category/hardware/cw-keying-issue/

I'm on v3, also. I tried looking for the original post, but couldn't find it. Anyway, your descriptions sounds about right. I thought it was odd back when I tried it for the first time...I have a few

Even if one is rich, i suppose that there is no point in investing in mics that zerve high end systems for ham use. We dont really need more than 0.3 to 3Khz at the maximum Regards Sarma vu3zmv

If you can't afford a Behemoth microphone (hi hi) you may try high sensitivity (around - 24db) electrec elements you may find at large vendors (Mouser etc). I opted for dynamic elements (not for

My two cents... First I've tried with a karaoke mic and a audio console Good: I get 10W of power without effort, talking quietly Bad: The signal transmitted is extremely low pitch (very dificult to

Yes the uBitx might have some flaws but not hard to find issues with other radios or how a ham is using it, mods, running power, etc. There are a lot of aging radios out there, my 840 is of the latest

Attached couple of mods I've been using ...One variable audio filter and one mod Re 386 ... The 386 shows what I measured on the ic with a 10 uF cap pin 1-8 ...flat from near dc to daylight ..What I

:) I think the TX of the ubitx has been the most tested, loved and blamed by hams in history. Also because it should be assumed that commercial ones should have no basic issue in terms of harmonics

Looks like the ubitx screenshot didn’t get attached properly, here they both are again for comparison. Sent from Mail for Windows 10