Date   
Re: question about current after building the DC connector

Edward Reynolds
 

👍


On Jul 14, 2019, at 12:03 PM, nomadg360@... wrote:

Thanks Ed, I assume that is the small pot (blue in my case) on the back of the board.

Re: question about current after building the DC connector

nomadg360@...
 

Thanks Ed, I assume that is the small pot (blue in my case) on the back of the board.

Re: Antuino 2.0

Bruce Hall
 

This is great news.  Thank you!

Bruce.

On Sun, Jul 14, 2019 at 2:08 AM Ashhar Farhan <farhanbox@...> wrote:
Josh,
the non-linearity, is primarily due to the first IF amp (between the diode mixer and the crystal filter) running out of steam. Change the R18 to 51 ohms (or just solder a 100 ohms across the existing 100 ohms resistor). That should bring up the linearity quite a bit. I notice a 10 db increase. I am collating a few tweaks of changing resistor values to get better linearity. I will post them in a day when I confirm that it works with a few more boards.

- f 

On Sun, Jul 14, 2019 at 1:23 AM <WoodJRx@...> wrote:
Still working on the code, but I was able to borrow a 72db step attenuator from a fellow ham.  With Bruce Hall's (bhall66)'s improved code, my Antuino is showing pretty good linearity (in my opinion).  I'm pretty sure I'm having more issues with the attenuator (as it is a slide switch design) providing consistent attenuation than issues with the Antuino.

Linearity.png

Still tinkering...

~Josh
W0ODJ

Re: question about current after building the DC connector

Edward Reynolds
 

On the back of display there is a contrast adjustment it might need a tweak.
Ed


On Jul 13, 2019, at 5:28 PM, nomadg360@... wrote:

Thanks everyone for your responses. I went ahead and put together the various parts and connected them up. When I did that and turned on the power, it looked like everything was working. That is, the display lights up and there are values in the display fields. I played with the turner and the frequency displayed changed.

 

I am not sure what I did wrong, but in the process of doing the other steps, I "fixed" something :) I suspect I had a wire wrong I had to make a couple of changes when I went back and reviewed each. step and did continuity checks on the wiring that I did.

Thanks again. Now I need to figure out how to do the initial testing and how to change the color on the display so I can see the writing, that yellow is hard on the eyes .....

Re: Antuino 2.0

Ashhar Farhan
 

Josh,
the non-linearity, is primarily due to the first IF amp (between the diode mixer and the crystal filter) running out of steam. Change the R18 to 51 ohms (or just solder a 100 ohms across the existing 100 ohms resistor). That should bring up the linearity quite a bit. I notice a 10 db increase. I am collating a few tweaks of changing resistor values to get better linearity. I will post them in a day when I confirm that it works with a few more boards.

- f 

On Sun, Jul 14, 2019 at 1:23 AM <WoodJRx@...> wrote:
Still working on the code, but I was able to borrow a 72db step attenuator from a fellow ham.  With Bruce Hall's (bhall66)'s improved code, my Antuino is showing pretty good linearity (in my opinion).  I'm pretty sure I'm having more issues with the attenuator (as it is a slide switch design) providing consistent attenuation than issues with the Antuino.

Linearity.png

Still tinkering...

~Josh
W0ODJ

Re: RX BCI filters

RICHARD
 

Yeah!! More power who cares about the rest of the spectrum

K6KWQ

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Curt via Groups.Io <wb8yyy@...>
Sent: Saturday, July 13, 2019 7:08:44 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RX BCI filters
 
Interesting for those close to big medium wave transmitters. But it seems to me there is a larger market to kit something to remedy v3 and v4 ubitx transmit spurious. What am I missing in our greater interest in only improving what we hear?

Curt

Re: RX BCI filters

 

Check this kit out...it’s what I am currently building for my version 4...go to https://www.ebay.com/itm/KIT-Universal-Bandpass-Filters-for-HF-Transceivers-BPF-6-6-bands-12V/172672735615?hash=item283418d97f:g:VtYAAOSwXj5aon5k

David Posthuma, WD8PUO

 


From: bitx20@groups.io on behalf of N8DAH <dherron@...>
Sent: Saturday, July 13, 2019 10:19 PM
To: bitx20@groups.io
Subject: Re: [BITX20] RX BCI filters
 

Curt,

 As much I would like to make a spurs/harmonics kit I can only make products for which I have equipment to test. If I was to make a kit for the spurs and harmonics I would be doing so on blind faith of others work. Maybe once I can afford the equipment I can make a kit for it but until then I do what I can.

Re: RX BCI filters

 

Curt,

 As much I would like to make a spurs/harmonics kit I can only make products for which I have equipment to test. If I was to make a kit for the spurs and harmonics I would be doing so on blind faith of others work. Maybe once I can afford the equipment I can make a kit for it but until then I do what I can.
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: RX BCI filters

Curt
 

Interesting for those close to big medium wave transmitters. But it seems to me there is a larger market to kit something to remedy v3 and v4 ubitx transmit spurious. What am I missing in our greater interest in only improving what we hear?

Curt

Re: question about current after building the DC connector

nomadg360@...
 

Thanks everyone for your responses. I went ahead and put together the various parts and connected them up. When I did that and turned on the power, it looked like everything was working. That is, the display lights up and there are values in the display fields. I played with the turner and the frequency displayed changed.

 

I am not sure what I did wrong, but in the process of doing the other steps, I "fixed" something :) I suspect I had a wire wrong I had to make a couple of changes when I went back and reviewed each. step and did continuity checks on the wiring that I did.

Thanks again. Now I need to figure out how to do the initial testing and how to change the color on the display so I can see the writing, that yellow is hard on the eyes .....

Re: uBitX reduced power option

Jack Brabham - KZ5A
 

RV1 is useful to reduce power which is already low above 40M.   Good feature if you would prefer a 1 watt rig.  Increasing power boils down to running higher Vcc on the PA and upgrading the PA cooling. 

I am building a V5 with front panel variable PA voltage, I expect to have to interconnect the variable Vcc with the PA bias circuit so that it tracks as required.

Getting rid of the power fall off above 40 involves replacing most of the transistors in the TX chain, all of which have reduced gain at higher frequencies (20M and above).   I really wish Farhan would raise the price a few bucks and put decent transistors in it in the first place.

73 Jack KZ5A



On 7/13/2019 3:59 PM, N8DAH wrote:

Mark RV1 will adjust the drive power this can be remote mounted with use of a good shielded cable. RV2 and RV3 are bias control of the two IRF510's.

When I had a V4 I had adjusted it to 5w on the lowest bad (80m) so I could drive an amp as well as save the finals while doing full duty cycle modes.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!


RX BCI filters

 

We will have BCI kits out in the next week or so for the bitx radios as well as other direct conversion receivers that suffer from close AM stations.

The drop off is right at about 3Mhz and will cost 5$+ shipping. 3x toroids and 4x caps will be used, this would be a good kit to learn about wrapping toroids for those that have not had a chance to try.

They are RX ONLY! and should not be placed in the TX path, we will have detailed specs and instructions for both the Bitx40 and uBitx radios.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: uBitX reduced power option

 

Mark RV1 will adjust the drive power this can be remote mounted with use of a good shielded cable. RV2 and RV3 are bias control of the two IRF510's.

When I had a V4 I had adjusted it to 5w on the lowest bad (80m) so I could drive an amp as well as save the finals while doing full duty cycle modes.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: uBitX reduced power option

MadRadioModder
 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of marks@...
Sent: Saturday, July 13, 2019 4:08 PM
To: BITX20@groups.io
Subject: [BITX20] uBitX reduced power option

 

Considering a uBitx purchase.  Wondering if the RF output is user adjustable and, if yes, how accomplished.

thx
mark in MN


Virus-free. www.avg.com

--

…_. _._

uBitX reduced power option

marks@...
 

Considering a uBitx purchase.  Wondering if the RF output is user adjustable and, if yes, how accomplished.

thx
mark in MN

Re: Antuino 2.0

WoodJRx@...
 

Still working on the code, but I was able to borrow a 72db step attenuator from a fellow ham.  With Bruce Hall's (bhall66)'s improved code, my Antuino is showing pretty good linearity (in my opinion).  I'm pretty sure I'm having more issues with the attenuator (as it is a slide switch design) providing consistent attenuation than issues with the Antuino.

Linearity.png

Still tinkering...

~Josh
W0ODJ

Re: On the air with the "Fish Soup 7" QRP Rig

KD2QMZ
 

A competitor is building and testing a similar product based in modules. What input we got on this and as far as any improvements on the foot print of the UBITX?

I do have a case. So, would like to re-use in a newer version, as my V4 doesn't seems to react to VFO adjustments in a way that improves that much.

The kit isn't that expensive, so I can buy a new more up to date UBITX.

Great kit and same for the case.

Thanks for any input.



On Sat, Jul 13, 2019 at 8:20 AM ronmhauser via Groups.Io <ronmhauser=yahoo.com@groups.io> wrote:
Farhan, do you know the idiom in English "The cobbler's children have no shoes."  : )

Very much enjoying my v5 uBitx.

73
--Ron
K0EIA

Re: On the air with the "Fish Soup 7" QRP Rig

ronmhauser@...
 

Farhan, do you know the idiom in English "The cobbler's children have no shoes."  : )

Very much enjoying my v5 uBitx.

73
--Ron
K0EIA

Re: question about current after building the DC connector

Evan Hand
 

sorry, did not read your reply before answering with the prior response.  The schematic provided as a pdf on the HFSignals web site is the best tool to figure out where to test.

After I checked the schematic, I noted I was one pin off on the 12v supply to the Raduino.  mIt is actually pin 2 of that connector.

Here is a link to the pdf schematic:
http://www.hfsignals.com/wp-content/uploads/2019/02/ubitx_v5.png


There have been threads on Group.io that have documented the values that can be found on the test points. though some are for RF testing with either a scope, frequency counter,  or spectrum analyzer.

So do you have all of the wiring complete including the Raduino installed?

73
Evan
AC9TU

Re: question about current after building the DC connector

Evan Hand
 

Is the Raduino installed, and does it power up? By that I mean does the display light up?  If you are testing prior to installing the Raduino (I believe that the current test is suggested prior to inserting the Raduino) then do not install it down.  Instead test on pin one of the connector (the end closest to the power connector) for 12 volts there (should be the same as the supply voltage to the rig).

I really believe that there is a wiring error, or a bad trace/solder joint on the board.  This would be possible, however all boards are tested an "calibrated" prior to shipping, so not likely.

I will try to make time to run some measurements on my v5 board.  Please verify that it is a v5.  I also have a v4 board, so can test it as well.

73
Evan
AC9TU