Thanks Arvo,

I have the older version 2 unit.? I wonder about isolation from TX RF bleed though or bleed over?? I just want to do my best to protect the uBitx.

I know tube are much more forgiving, in my personal limited experience.

I will have my uBitx in a metal case,so maybe just making an adapter with a dead short at the antenna connection during transmit will be a good solution.

Thank you, Jeff K9JP

On Fri, Feb 16, 2018 at 3:19 PM, Arvo KD9HLC via Groups.Io <arvopl@...> wrote:

I'm planning something similar, using the ?B for TX and SDR for RX.? I'm going to try one of these in the box.

--

Not all of me will die - - - The good I do will live forever.? <><

Also, what kind of wire is recommended on the new transformer?

Thanks,

Carl, K0MWC

Some more info and pictures for anyone wanting to use the uBitx on 160m.?

I’m having a blast on 160m I did add larger heat sinks and a pair of small fans that I can turn on and off as needed to keep the finals cool if I’m long winded or using digital modes.

Qrp labs makes a great low pass filter kit:

I added a BNC adapter to connect to the LPF to keep it simple.?

On Feb 7, 2018, at 7:22 AM, bill richardson <ng1p.bill@...> wrote:

160m doublet feed with 450 ohm line.

On Feb 6, 2018, at 9:23 PM, Vince Vielhaber <vev@...> wrote:

What are you using for an antenna?

Vince.

On 02/06/2018 08:06 PM, bill richardson wrote:

Turned the output down to about 8 Watts and have made 4 contacts on 160 with great reports. Will add a larger heat sink to be safe.

On Feb 6, 2018, at 7:26 PM, bill richardson <ng1p.bill@...> wrote:

I don’t have a spectrum analyzer but I think your right. Without the LPF installed I’m seeing over 20 Watts out on 160m and with it I see 12watts out so a lot of signal outside of the 160m band is happening...

On Feb 6, 2018, at 7:12 PM, John Backo <jabac@...> wrote:

Bill:

I think what you are seeing is the "normal" variation in the

output of the MOSFETS. Some are better than others at RF.

Gordon's suggestion to turn back the drive is probably the right answer.

Alternatively, you could turn down the gate voltage a bit, but that

would probably introduce compression distortion. Or you could increase

the size of the heat-sink and see how it goes. Probably the wisest thing

to do is both turn back the drive a bit and increase the heat-sink.

Some, but not all, IRF510's are capable of 20W or more on 80m.

you might happen to have some good ones. The key lies in the

harmonic generation and the heat-sinking.

Note that what you are seeing MAY be from UHF oscillation included in

the signal. Be very aware of that. Check your output very carefully.

john

AD5YE

--

Michigan VHF Corp. ?? ??

????????????????????????

I have 4 line I2C running on uBit.

I have the RaduinoX "Better Raduino", it has a dedicated I2C connector and a dedicated Encoder connector.

I have sold over 50 PCBs and assemblies to guys on the list here.

It has lots of features, regulator fix, heat sink, ect.? Real Level Shifting on SI5351 too.

Nano plugs in and faces the other direction.

I am on my second order of 50 PCBs, so I have lots!

Contact me for more info...MotDog at Verizon dot net.

73's,

Mike, WA6ISP

On 2/16/2018 9:43 AM, Jim Sheldon wrote:

Incremental upgrade to our software for I2C display equipped Raduino cards and also our newly announced "RadI2Cino" card which is an (almost) drop-in replacement for the Raduino.? This release covers all the enhancements for the NON I2C Raduino released earlier in our non-I2C version 2.00R.? All the enhancements and new stuff is covered in the instruction PDF file --

(this version has also been uploaded to the "Files" section)

Jim - W0EB and Ron - W2CTX

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

I'm planning something similar, using the ?B for TX and SDR for RX.? I'm going to try one of these in the box.