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https://hamgear.wordpress.com/2015/02/03/make-your-own-transceiver-with-a-dorji-dra818u-or-dra818v/ But, this is not much of a homebrew. The challenge would be to build something from scratch. -

Hi Fred. This is also on my project list. I have both the V and U version of the DRA818. I am planning on a simply desktop unit powered by arduino and a nokia 5110 lcd. a cheap baofen mic/speaker.

I ordered mine on Dec 14 and received it this morning... Brian K9WIS ---- James Tate <kw4sz@...> wrote:

Hi Ian. This work you are doing on the FW is incredible. Many thanks for your efforts, and to every one else for their contibutions. I plan on doing the following to your version once you are "done"

I've been working on a plastic one that fits both the Pelican 1150 and the Apache 1800. I actually bought the Pelican without the pick-n-pluck. I still need to thin it some since I found it can

Haven't heard back on this one. Were you able to get a good compile? Jim

Hi Ian, Great, thanks for the extra explanation. I have been using the v.31 a bit this evening and I like the changes. Band Change I found one anomaly that when I set a frequency on any given band

Very interesting, and quite promising. Like I say, I hope it works. I'm not keen to have all those relays in there. uBitx schematic is

Seems like it shouldn't take too much effort to be posting where they're at on the batches correlating to order dates.

Using two LM78L05's in a push-pull amp is very cool, he seems to think it works to 30mhz. That regulator has been around for about 40 years, there are better now. The faster a regulator responds, the

Hi Jerry; My Laptop is back in service, and I've taken a look at your concerns in simulation to the extent that I can assess what I observed while evaluating my feasibility prototype of the RF

Dave Of course. When the firmware is complete, I will upload manual. I will briefly describe the ADC measurements. ADC measurements can be used in many ways. You can reduce the error of CW Key in

The RDA818/DRA818 is a VHF/UHF transceiver IC used by baofengs and the like. There are a number of projects (including hamshield I think) which use it.

John I occasionally visit Harry's web pages. We were both working in Saudi Arabia at the same time but I did not meet him. I did not find the 10 watt amplifier but did find a few newer entries

If a fuse is too slow and a simple current limit makes the amp non-linear, perhaps use foldback current limiting. If the current ever exceeds perhaps 3 Amps, then shut down the power to the

You are absolutely right, Jerry. It was not my intent to diss the IRF MOSFETS. What I am saying is that they are different beasts and one has to understand that to make them work well. And it can be

Philip Thanks for this firmware. I am borrowing a little memory space left for the next concept and adding fun features. Ian KD8CEC 2018-01-30 7:36 GMT+09:00 Philip <philip.g7jur@...>:

Joel You've looked at uBITX Manager. yes i added it at 0.31. for next concepts (with h/w modification) but, You will soon be able to try out the other of the fun. alwayis info. scroll info. Now I

For lots of ideas and circuits (including a 7805 push-pull amplifier!) check out Harry's Homebrew Pages: http://sm0vpo.altervista.org/index-1.htm He includes a lot about RF amplifier design and

Thanks for information. So far, what I wanted was a minimal real transceiver function. Now, before I finish this concept (without h/w modification), I am going to put in one or two fun features (very