Date   
Re: Fldigi with UBITX

Gordon Gibby <ggibby@...>
 

Can’t remember, but when in doubt, use the mic ground I think. They ought to be pretty much the same.


On Mar 4, 2018, at 09:19, "dmason@..." <dmason@...> wrote:

Hey Gordon, did you use the mic, speaker, or PTT ground (or tie all three together)?

Re: temporary enclosure

Michael Hagen
 

Forget the new enclosure, that's the nicest installation in the shipping box I have see on the Group.

You will ruin it if you change.   Cut a hole for the poor final transistors! Thanks for the Picture!

Mike


On 3/4/2018 1:37 AM, chokelive E29AHU wrote:
My uBitx done to Installed to shipping plastic box. This for temporary until enclosure from amateurradiokits has arrive

was fun ..

73 de E29AHU
Choke
 

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

Re: Fldigi with UBITX

dmason@...
 

Hey Gordon, did you use the mic, speaker, or PTT ground (or tie all three together)?

Re: Fldigi with UBITX

dmason@...
 

Thank you Gordon.

Re: New "Better uBit Raduino"

César EA3IAV
 

Hi! I would like to have a raduino board. How donI order one? Thanks cesarleon att me.com 

Re: top band ubitx

Mikael <mikael.madsen@...>
 

Been looking for a suitable combined heatsink for the finals for while wanting to maximize heat dispersment

My case is metal (ventilated) but front and back are plastic so case as heatsink doesnt work.
Wanted to maximize the heatsink whithin albailable space in the case. (Why cant you find exactly the size you need...)
Finally decided on an aluminium F-type heatsink that is almost as high at inner height (80mm) of my case

https://www.aliexpress.com/item/Fast-Free-Ship-High-quality-aluminum-fin-F-type-radiator-dense-tooth-heat-sink-78-40/32780855970.html?

Intend to screw it to the case bottom, possibly with a couple of washers so top fins will touch case top
Width is as much as I easily can fit without blocking for other items needed to be fitted to back of case. 

Any pics out there of large fitted heatsinks?

Re: Autotuner for BitX40

Lawrence Galea
 

On Sun, Mar 4, 2018 at 6:20 AM, K5ESS <k5ess.nothdurft@...> wrote:

http://docplayer.pl/docs-images/25/5892215/images/48-0.png

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mvs Sarma
Sent: Saturday, March 3, 2018 10:43 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Autotuner for BitX40

 

Any link to ldz11 schematic please.

 

On 4 Mar 2018 10:10, "N8DAH" <Dherron@...> wrote:

The old LDG QRP tuner if you can find one works great upto 30W.

Elecraft T1 works good too

LDG Z11 (you will need to wire in 12V and use the tune button on the front of the tuner and tx either CW or a long HaLLOOO)

Any of the LDG tuners will work you will just have to make a cable to get 12v from somewhere and use the tune button.

I use a KT-100 with my icom by taking 12v from the ACC port, you could put a 12v out on the bitx to do this as well.

Using a pre-tuned Antenna is nice but limited, I use a tuner pretty much all the time the lower your SWR the better. With a good tuner the loss is very very small, unless you are using a massive tuner for say 1Kw at QRP levels and even then tuned right it will work.
--
David

 N8DAH
Kit-Projects.com


Re: Surplus Case from Skycraft Parts #ubitx #bitx40

w4rjp
 

Very nice case, Carl.   Would make anyone's uBitX proud.

73, Bob W4RJP

temporary enclosure

 

My uBitx done to Installed to shipping plastic box. This for temporary until enclosure from amateurradiokits has arrive

was fun ..

73 de E29AHU
Choke
 

Re: Fldigi with UBITX

Gordon Gibby <ggibby@...>
 

I’ve been running Bitx40 and uBitx on Signalinks for quite a while, all you need to do is wire the mic, speaker, push to talk.


On Mar 3, 2018, at 21:55, "dmason@..." <dmason@...> wrote:

Walter, I am going to interface my ubitx to my existing Signalink (bought a 5 pin DIN chassis connected so I can use the same cable that I use with my Ten-Tec Jupiter).  Did you have to do anything special other than running the mic, speaker, and PTT wires to the Signalink?  Thanks.

Dale, W9ESE

Re: rv2- messed up setting and txing like mad!!!

Alan -MMØWXT
 

Hi John thank you for your reply and indeed Kudos to the Gurus. From holding Ammeters the wrong way round to now discussing Gate voltages and Drain currents.... :-)

OK now I get it. Use current as the measure and not just voltage.I was reading about break down voltages at 3-4 volts for IRF510's but glad to know it is ok to adjust to 200ma aka 3.60&3.99V and just leave it be!

I managed to solder in a couple of resistors at R60&63(?) to stop me having to bellow to get a response from the audio.

All in all a great education, thank you.

Alan

Re: Help Needed downloading new uBitx software on Mac

Mike Lichtman
 

Mike Woods,
    Thank you for the answer. It was the USB A to mini B cable. It must have been like the one you described as for power only. 
I tried a thicker cable and the serial port appeared and the new firmware loaded successfully. i also downloaded the ch340 driver.
My first contact was from So. Cal to Hawaii on 40m SSB so all is good. I learned something about cables tonight. 73 Mike KF6KXG

Re: Autotuner for BitX40

K5ESS
 

http://docplayer.pl/docs-images/25/5892215/images/48-0.png

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mvs Sarma
Sent: Saturday, March 3, 2018 10:43 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Autotuner for BitX40

 

Any link to ldz11 schematic please.

 

On 4 Mar 2018 10:10, "N8DAH" <Dherron@...> wrote:

The old LDG QRP tuner if you can find one works great upto 30W.

Elecraft T1 works good too

LDG Z11 (you will need to wire in 12V and use the tune button on the front of the tuner and tx either CW or a long HaLLOOO)

Any of the LDG tuners will work you will just have to make a cable to get 12v from somewhere and use the tune button.

I use a KT-100 with my icom by taking 12v from the ACC port, you could put a 12v out on the bitx to do this as well.

Using a pre-tuned Antenna is nice but limited, I use a tuner pretty much all the time the lower your SWR the better. With a good tuner the loss is very very small, unless you are using a massive tuner for say 1Kw at QRP levels and even then tuned right it will work.
--
David

 N8DAH
Kit-Projects.com

Re: Add 16 I/O Lines to uBit or BitX

Dan Reynolds
 

Not sure how to email you. My email used to be at qrz.com

I can't find a reply to sender...

--
Dan Reynolds -- KB9JLO
<><

Re: New "Better uBit Raduino"

Fred Buecker
 

Any thoughts on something based on the STM32 to replace the Arduino?


On Mar 3, 2018 4:10 PM, "Michael Hagen" <motdog@...> wrote:

I have been asked if I had a uBit Raduino by many who bought RaduinoX PCBs.

I have sold over 50 X PCBs and tested units.

Well I finally got a few built and tested today.

The Big Extra is I added an I2C Bit Expander.   This add 16 MORE I/O ports to fiddle with.

2 - 12 Pin Molex Connectors add 16 I/O and some +5V and Ground pins, as well as some control pins

for the Microchip Expander IC.   You can use Adafruits Library MCP23017 to create 16 more Digital Pins.

You can see from the pictures it squeezes in just like the original.

I tested it in uBit today with a signal generator.  The only antenna I have is a 40M copper pipe loop.

There were NO signals anywhere!  Not even my BitX buddy at 7.200 MHz!

The Signal Generator was heard way down to about 0.4uV at 3 and 10 Mhz.  

So, the receiver seem to work fine.

Rainy weather and an RF dead day!


email me for any more info...

motdog@...

73's

Mike, WA6ISP


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

Re: rv2- messed up setting and txing like mad!!!

John Backo
 

Alan:

TNX for kudos to the Three Gurus.
Glad you learned so much.

It is ok for the IRF510 to have different gate voltages on different units.
They are actually extremely variable and easily can run a gamut of gate voltages
from ~2v to ~5v, and still be in the "linear rf" region. If those are the voltages measured
with a proper increase to 200 ma. quiescent transmit current, then that is correct.
That being said, it is best to use MOSFETS from at least the same manufacturing
batch as they are easiest to adjust together. You have already noticed that by replacing
one IRF510 and noting different gate voltages on two devices with proper adjustment.

That is a proper quiescent TX draw. Now, if you can cause the IRF510 drain to increase
the current draw to 1.0 - 1.3 Amperes with a mic signal, that is the correct level of output.
Note that this is NOT accomplished by changing the gate voltage -- leave that alone when
it is properly adjusted to about 200 ma total draw. Change the drive from the audio/rf
chain into the PA via RV1. That should be increased until just below the level of distortion.
Don't worry if you overdrive it a little; you can always back it off a bit with no harm done.
However, note that the impedance the drain sees is very important. It MUST be close to
50 ohms, If it is low, it will probably lead to spurious oscillation. If it is high, it will probably
lead to overheating the devices...and, of course, little real RF output.

In answer to your question about "ignoring" gate voltage...the answer is no. Never ignore
the gate voltage of the MOSFETS. Because there is a narrow range of voltage on the gate
which allows them to operate as RF devices. Rarely does it exceed 5v and rarely is it less
than 3v or so. But it can be almost anywhere within the 2-7v range. The only thing you know
for sure is that there is a virtually instantaneous rise in current when the "linear" region has
been exceeded, which promptly destroys the MOSFET with too much heat generation.
So using the current draw method is really a good one as it shows when "enough" adjustment
has been made, even though this is really a voltage sensitive and functional device.

If you really want to increase the power out, increase the drain voltage (to 24+v) and increase
the heat-sink size to handle a larger heat dissipation. Leave the RV adjustments pretty much alone
once they are made the first time.

Hope this helps.

john
AD5YE

Re: BITX Adj power output

_Dave_ K0MBT
 

The final drive has a separate voltage source.
Can you adjust the voltage on this stage affecting power output?

Re: Autotuner for BitX40

 

LDG does not release Schems best you will find is a pin out of the connections. If you do find a schem for LDG's let me know I am looking for IT-100 and the KT-100
--
David

 N8DAH
Kit-Projects.com

Re: Autotuner for BitX40

MVS Sarma
 

Any link to ldz11 schematic please.

On 4 Mar 2018 10:10, "N8DAH" <Dherron@...> wrote:

The old LDG QRP tuner if you can find one works great upto 30W.

Elecraft T1 works good too

LDG Z11 (you will need to wire in 12V and use the tune button on the front of the tuner and tx either CW or a long HaLLOOO)

Any of the LDG tuners will work you will just have to make a cable to get 12v from somewhere and use the tune button.

I use a KT-100 with my icom by taking 12v from the ACC port, you could put a 12v out on the bitx to do this as well.

Using a pre-tuned Antenna is nice but limited, I use a tuner pretty much all the time the lower your SWR the better. With a good tuner the loss is very very small, unless you are using a massive tuner for say 1Kw at QRP levels and even then tuned right it will work.
--
David

 N8DAH
Kit-Projects.com

Re: Autotuner for BitX40

 

The old LDG QRP tuner if you can find one works great upto 30W.

Elecraft T1 works good too

LDG Z11 (you will need to wire in 12V and use the tune button on the front of the tuner and tx either CW or a long HaLLOOO)

Any of the LDG tuners will work you will just have to make a cable to get 12v from somewhere and use the tune button.

I use a KT-100 with my icom by taking 12v from the ACC port, you could put a 12v out on the bitx to do this as well.

Using a pre-tuned Antenna is nice but limited, I use a tuner pretty much all the time the lower your SWR the better. With a good tuner the loss is very very small, unless you are using a massive tuner for say 1Kw at QRP levels and even then tuned right it will work.
--
David

 N8DAH
Kit-Projects.com