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

Hi, I just did a quick comparison test between my ubitx and Yaesu ft-840 radio. I used a SDR on a laptop with a up converter, the SV1AFN with a 200mhz LO. I had a multiband antenna on it from a

Exact!

Hi Mike, a lot of ideas abound; some are repurposed cb microphones, some are home brewed with what's in the kit, I ordered a Uniden BC645 4-Pin Microphone for CB Radios, electret mic, going to wire

Looking to use my BITX on SSB and cw and trying to figure out a good mike for it, either hand or desk. Will likely take to Costa Rica later in the year and possibly leave there. Suggestions or where

Which bitx are you using. I have uBitx and R52 is near audio predriver and its a 2n3904. How do I do this on a uBitx v3. I guess this is what we call a carrier burst? Joe KD2NFC

Ron thanks I found them. see if your instrument under units can be changed from dB v to dB m. I think that may change the result. Curt

Thank you all for your replies. Much appreciated. I will do more work based on your input and report back on the results. 73, John (VK2ETA)

Maybe. Except it is working just fine at the first mixer on thousands of uBitx's.

It seems the slightest leakage from "open" unbalances the mixer -and an Arduino output doesn't deliver that cleanly. Physically switching the key, direct from the panel socket or by relay, may be the

Ok, zipped in files section, deleted from photos section

Gah! I guess the website shrinks the file resolution, they are not readable. Hm. Maybe there is a way to upload the full resolution pics

Hi everyone. Someone, I think Curt, asked about spectrum results on 12m/10m which I had not looked at previously. The screen caps are in Photos (not files) under my call, K0EIA. If I am reading

Hi Joe, There was a blocking diode fix on r52 that fixed all of my cw issues. I'm going off of memory...but, I lifted r52, on side towards 2822 chip, add diode in series...cathode down to board. I run

John, Topology is different between first and second mixers on the uBitx. I'd do your mod as proposed, but cut traces to T4 pins 3,5 and 6. Swap them so T4 pins 3,5 are in from R47, pin 6 is out to

There are hams who might be priced out of the market by that... hams who are technically competent but who are on very limited means. That's the beauty of the Bitx radios... they're made to

Iz If I were Farhan - I would move on to other things! Let's see what's in the future - Given that we have thousands of v3, v4 and v5 around the globe -- I suggest that some merchant(s) kit 'the

I recently installed the 5” Nextion on uBitx Rig. I noticed that on the 10 meter band the CW key sticks when pressed and there is a noisy tone that goes along worn it. I guess this is RF getting in