I purchased this one. My radio tech manual shows test points up to 8v so I think this probe should cover it. The other one said 3v input max. 

 

https://m.ebay.com/itm/RF-Active-Probe-0-1-1500-MHz-1-5-GHz-HF-VHF-UHF-SHF-analyzer-oscilloscope/291998278881?hash=item43fc7424e1:g:G6oAAOSwX61ZIDPm

The more I read about these FETs the more they seem to behave like valves/'toobs'. A symmetrical output stage driven anti-phase each side is a form of Class B. If there's a non-linear section at turn-off/on then bias above that towards the linear Class-A. That means a small(ish) 'resting' current at Class AB. I'd go for the 10mA/side 'static' bias. 100mA is operating each side in Class A - very linear but very inefficient (more heat!), fine for the Bitx40 but not the uBitx. Has anyone investigated the 'valve-type' transfer curve(s)? How much bias to get beyond the non-linearity into linear (distortion-free) operation for spectral purity?

I would like to get on of these and a real one not a knockoff but I’m trying to find one build already. I’m not afraid to build the kit but I’d rather get it built at the moment. 

I’m also looking for a RF millivolt reader. I want to check some RF voltage points on my Yaesu for starters. It’s a good introduction for me to get started with using test equipment. 

Joe

KD2NFC 

On Feb 1, 2018, at 4:54 PM, Doug W <dougwilner@...> wrote:

On Thu, Feb 1, 2018 at 01:40 pm, Jerry Gaffke wrote:

Very nice of JYE-Tech to release all that, would be good karma to support them by avoiding clones.
It's more likely to work, and you are more likely to get support if it doesn't.
They specifically mention the SainSmart clone up on their website.

To build on Jerry's point, https://www.jyetech.com/Products/LcdScope/e138.php is worth a read.  I've been looking at these kits off and on and had no idea. 
I've purchased SainSmart filament in the past, never again.

Dear All,

Inviting you all to have a look on uBitx Case Home brewed.

http://vu3psz.blogspot.in/2018/02/ubitx-home-brewed-enclosure.html

<uBitx_2.jpg>

Hi Ian:

I think you should consider it, as you have lost all type checking across files by making them all *.ino files. Obviously, this has not been a problem, but might be in the future. Just a suggestion to restore type checking.

Jack, W8TEE

---

From: Ian Lee <kd8cec@...>
To: BITX20@groups.io
Sent: Monday, February 5, 2018 6:04 PM
Subject: Re: [BITX20] uBITX Firmware (CEC) 0.30 released (Test version). #ubitx

Jack.

Thank you for your attention and advice.

I first used Arduino. So I thought that Arduino was this style.(I did not know.)

I also decided that it would be nice to keep the original name in order to share code in github. In fact, some or all of my code has been merged into someone else's project.

On the other hand, I received a pullrequest request from someone else and my code was modified.

But now I was wondering if I should keep this style with little or no original source left.

I released it to version 0.35 a few hours ago.It's got more features than I thought with the help of many great people. they has good idea and good suggestion.

I have put all the functions I wanted to put in, except to build in wspr. So going to release Major in 1.0 soon.

I think this issue should be reconsidered at that point.

Thank you again for your interest.

Ian KD8CEC

2018-02-06 6:54 GMT+09:00 Jack Purdum via Groups.Io <jjpurdum@...>:

Hi Ian:

I was wondering if you had plans to convert the support files for your software to *.cpp files from their current *.ino secondary file names (except for ubitx_30.ino)?

Jack, W8TEE

--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Hi,

I know there have been some threads on these topics before, however I'm kinda interested what the current 'state of the art' is, so to speak.

Is there anyone using CAT control on their bitx 40, and how are you doing it? If you are doing digital modes are you using VOX circuit for the PTT, or via another method. Thanks!

Ralph
N9WTX