Hello, My shipment of replacement RF Mosfets have arrived and I want to replace the on board PASection with one based on the RD16HHF1. It will be a separate small PCB based on the reference design

I might be willing to swap your Ubitx for mine. I haven't touched it yet still new in box. I'm working on modding my bitx 40s for now. If interested let me know we can work out the details. James

Why replace everything? You can probably put it in place of the 510 (making sure it is pinned correctly, of course). I am waiting on a pair, myself, that I will be stuffing into the ubitx. I want

Getting closer ordered mine the 18th

Hello Nick, I am very interested in knowing what results you get. My main objectives in not placing it in the Tx path are to reduce the toroid size and to avoid introducing extra mis-match as I have

That’s what I did, I put an 0805 SMD resistor in between the pins of the digital connector. It fits quite nicely. And it works fine Clark Martin KK6ISP

I've uploaded an LTSpice simulation of the uBitx Power Amplifier from Q90 on out through the IRF510's but not including any of the transmit low pass filters, can be found here:

Thanks for nice info. I had replaced 10k to 4.7k before this question. I tried to replace 4.7k to 2.4k or 1.5k. finally 1.5k but output power doesn't go up, still 3w. This resister is available for

Hi Hiro san, Each time after you replaced the resistor to a lower value, did you also perform recalibration? Changing the resistor value may have some effect on the optimum calibration point for

Ian's firmwares working great! I have been using then since version 0.25 Now running 0.33 and working 7MHz FT8-mode. Over 350 QSO.s in my logbook TNX! Kari OH5YW

Here is how I made the socket and mounted the RDD16 Note the RDD is reversed and then the gate is actually soldered tothe IRF gate line which goes behind the FET. Now I can use either of them.. You

Dennis, Modifications to use a Dynamic Mic. Referring to the uBITX Schematic. The Gain of the Mic PreAmp is controlled by R63 in the Emitter of Q6 to C62/R64. It basically decouples the audio bypass

Just put a DC Blocking cap in series , I use a old CB hand mic, Works fine . Gw0wvl Sent from Yahoo Mail on Android

Hello group, After looking at the very nice schema of the uBITX (http://www.hfsignals.com/wp-content/uploads/2017/12/ubitxv3.pdf) i have a question about the K1 relay. The K1 relay is used for the

Very nice. I wish I could figure out FT-8. I can't get anyone to comeback on my regular rig. These apps are very intricicate. Too bad there isnt some kind of standard for making radio software

I really like that! If you fold the RD16 over you could use a heat sink out the back… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big

Also… have you had it on the air like that yet? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton,

for those wishing to join us on slack and talk real time

My thought process is a separate board would allow more mounting options for a heat sink, and cleaner layout after on the Bitx 40. I hate to admit it but I’m not an engineer and even my basic math

Jerry… thanks for doing this. I had intended to do this same thing but so many things kept getting in the way. Since you uploaded the .asc I’ll try some of my favorite PA transistors in place of