Date   
Re: JackAl board pricing

Art Olson
 

Jack

Been holding off on building the board I bought until you have reached a final one. Assume the board I have isn’t compatible with your modified changes

Art - N2AJO


On Jul 18, 2018, at 7:51 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

We changed the board again (now on V4) because we were not happy with the noise level. Al has that figured out and we hope to order new Beta boards in the next couple of days. 

Jack, W8TEE

On Wednesday, July 18, 2018, 5:38:59 PM EDT, Tim - M0THM <tim@...> wrote:


Hi Jack,
Just wondering how things are coming along.

Cheers

Tim

Virus-free. www.avast.com

Re: RF power chain mods and improvements..

ajparent1/KB1GMX <kb1gmx@...>
 

There is worked and "worked".  I keep getting this.  If they solve your problem wonderful.
Others tried them and they didn't really help much compared to other devices.

In context they worked in that they were marginally better than the 2n3904s, but compared
to the 2n2222A or 2n2219 they were not very good.   Compared to 2n3866 they were poor.

I went and bought some to test and they came from a reliable source (I don't use Ebay or aibaba)
and they were genuine Fairchild branded parts.  All showed good beta/HFE but they didn't achieve
generally better power over bandwidth.  They looked good on the curve tracer too.   I used a few
for another project at lower power and they performed well there at 29mhz but I was only asking
them to deliver 50mW.   The uBitx driver has to supply much more.

If you put them in, the radio will still work, but you will not get much improvement. 

Allison

Re: RF power chain mods and improvements..

ajparent1/KB1GMX <kb1gmx@...>
 

On Wed, Jul 18, 2018 at 02:42 PM, Nick VK4PLN wrote:
Would you say the 2n2222A were better candidates than 2n5109? that is in regards to flatness of output across the bands?
Where in the world did you get that idea?
Price and availability and poor reading. 
The list was from common and easy that solves many  users needs (good at 80-17M) to exotic
and better (for 20mhz and up) but maybe trickier due to higher FT.

A technical Question/ Learning session if you wouldnt mind Allison/ Others:

So to set the bias of these BJT we are changing a resistor to get a certain amperage.
Lets take the pre-driver #1, Q90, for instance: is the bias set by R81 and R82(voltage divider)? and if so, according to your earlier post we measure the voltage drop across the emitter resistor, and then calculate the mA. Now you state 20-30ma? where does that figure come from? is it different for each BJT we try?
Run Q90 at 30ma and watch it heat up.  Its a ridiculous current to run for a stage that may produce 10mW
and a device that is not designed to run at that current level. (BFR106 datasheet).  I've suggested numbers
for this as UNDER 20ma even with the 3904 (mine with the factory 3904 was running at 33ma!).
To correct the bias, change the base to collector resistor R81. 

The predrivers have to produce a bit more but they are in parallel so 20ma each is fine
Also running more than that is just wasting current to produce heat, not RF.   

The driver in mine (3904s) were idling at 39ma each and the IR temp meter was show them at 145F.
Again its a impractically high current for most devices used in that spot.   Many of the devices have
a sweet spot and its a balance of wasted power as heat and circuit requirements for impedance and 
power out.   So it is both different for each device and also a consideration to keep from cooking it.

However if you think you have a better number...  I'm waiting. 
FYI if you read the whole chain I've repeated myself so many times, I give up.


Allison

Re: RF power chain mods and improvements..

MVS Sarma
 

Glen,
I understand that while mpsh10 might possibly be faked, the smd version mmbth10 is still genuine even with Chinese sellers.like ebay etc
sarma
vu3zmv


On Thu, Jul 19, 2018 at 5:32 AM, Glenn <glennp@...> wrote:
That's interesting on the MPSH10's.   They seemed to work well for me in my testing but I might add my MPSH10's were bought some 10 years ago.   I wonder if they too, have succumbed to the Chinese(?) re-branding of some other inferior part?

glenn vk3pe


Re: RD16HHF1 power curve flattening...some

MVS Sarma
 

of course "snail mail shipping-- about 30 0r 40 days ti India but you might get faster  if in US.

Regards
MVS Sarma
 

On Thu, Jul 19, 2018 at 12:32 AM, Kevin Rea <reakevinscott@...> wrote:

How long does it take you to receive things from polida2008 ?

 

Kevin

 

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Ashhar Farhan
Sent: Tuesday, July 17, 2018 10:44 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 power curve flattening...some

 

Are you sure that the pins are not shorting? 

 

On Wed, 18 Jul 2018, 10:23 Mvs Sarma, <mvssarma@...> wrote:

I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.

 

 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.

 This seller is now operating with another seller name " 5hk1584 "

 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.

 


Regards
MVS Sarma

 vu3zmv

 

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:

On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:

Hi John,

did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea

 


Buying just the stock standard vanilla #Radiuno (no uBitx) #radiuno

VK3HN
 

I previously purchased a Radiuno by itself for use in homebrew projects and would like another.  I don't want to take the time to source parts or build any of the expanded/extended/redesigned Radiunos at this time, exciting and good as they may be.

I cannot find the "Buy a Radiuno" button on hfsignals.  Have they been withdrawn from sale?

regards Paul VK3HN

Re: Screen showing only blocks ?

chuckr@hostu.org
 

Well, So I caught the culprit !!!  Red Handed or should i say RED FACED ...A classic nube move, yep the nincompoop plugged the screen on upside down, If i catch up with him you bet he will get a good tongue lashing.

oh i forgot my name.......

QST review of the Bitx40

Jerry Gaffke
 

Just now got my August 2018 copy of QST, a ham publication by the ARRL here in the states.
Has a very positive review of the Bitx40 starting on page 44, built with Sunil's enclosure.

Expect a wave of new forum members.

Jerry, KE7ER

Re: Buying just the stock standard vanilla #Radiuno (no uBitx) #radiuno

Nick VK4PP
 

Hi Paul.

I have one, email me with an offer. with or without LCD...

73 Nick VK4PLN

RFI Problem related by routing audio through K3 (uBitx)?

Björn Pasteuning
 

Hi all,

I have just received my uBitx,

From start I have noticed RFI problems while TX'ing and coming audio from the speakers.

I have shorted all wireing to a minimum.

I looked at the schematic, and see audio is routed through relais K3.
Although audio is switched "loose" while in TX, could this be a culprit?

Anyone else experienced this problem?

73
Bjorn de PD5DJ

--
73' Björn de PD5DJ
www.pd5dj.nl

Re: Getting ready to build my first Ubitx ver 4

Sherman Banks
 

That’s what I’m doing. Getting the stock radio working and then moving on….

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Kevin Rea
Sent: Wednesday, July 18, 2018 4:36 PM
To: BITX20@groups.io
Subject: [BITX20] Getting ready to build my first Ubitx ver 4

 

I just received my kit in the mail.
I also have a Nextion 3.2e...
do you think I just build it all stock first and then do the mods such as the screen ?

Kevin

BITX QSO Afternoon/Evening, Sunday, July 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

BITX QSO Afternoon/Evening, Sunday, July 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Join us as we make contacts with our BitX-40s or uBitXs or anything else on 7.277 MHz in 40 meters!

This is a worldwide event for BitX40 (and other QRP) stations starting at 3PM and 7pm in each time zone. To participate, call CQ BitX on Sunday, starting at 3PM and/or 7PM your local time. The BitX QSO Night continues through the evening and conditions usually improve after sunset, so it is worthwhile to participate later in the evening.

Suggested Best Operating Practices:

Work at QRP power levels unless conditions require more power.
Call and listen for CQ BITX on the hour and every quarter hour.
It is helpful if you call CQ BITX with your callsign, name and location. 
Repeat your callsign a number of times during your CQ BITX and during QSO's.
Start a QSO by confirming the callsign, location, name and signal report of the other operator.
Say the callsign, name and location of the other operator so others can hear.
If the frequency is busy, avoid long conversations.
After your initial QSO is complete, ask if there are any other stations who would like to contact.

Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.

This is an undirected, scheduled event.  The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls on Sunday evening.  Talk to you then!
--
John - WA2FZW

Re: BITX QSO Afternoon/Evening, Sunday, July 22, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

I won't be around this weekend; Doing the CQ WW VHF contest at our remote location. That probably means conditions on 40 meters will be fantastic! Have fun!
--
John - WA2FZW

S meter wiring

Bill Carpenter <nz0tham@...>
 

OK, I got the ND6T AGC board built, installed and working.  Now I want to implement the S-meter in the KD8CEC software.  Not sure how the wiring works.  I have spent some time searching this forum and it appears the unattached purple wire goes to the AGC board but where?  Once that's done I go to uBITX manager and check the S-meter box and also need to set parameters for the S-meter?

Help!

Re: S meter wiring

pat griffin
 

Bill pick up agc voltage from the positive end of the agc output capacitor. I think it is c4 but I am not looking at the schematic. It is the cap tied to the jumper for setting hold time. Connect this to the purple lead and adjust in the manager
73
Pat aa4pg


On Jul 19, 2018, at 7:43 AM, Bill Carpenter <nz0tham@...> wrote:

OK, I got the ND6T AGC board built, installed and working.  Now I want to implement the S-meter in the KD8CEC software.  Not sure how the wiring works.  I have spent some time searching this forum and it appears the unattached purple wire goes to the AGC board but where?  Once that's done I go to uBITX manager and check the S-meter box and also need to set parameters for the S-meter?

Help!

Re: S meter wiring

Bill Carpenter <nz0tham@...>
 

Is it J1?

Re: S meter wiring

pat griffin
 

Yes.  I was able to get a dab of solder and a wire on the positive end of C4.

73,

Pat AA4PG


Pat Griffin
http://www.cahabatechnology.com


From: BITX20@groups.io <BITX20@groups.io> on behalf of Bill Carpenter <nz0tham@...>
Sent: Thursday, July 19, 2018 7:36:03 AM
To: BITX20@groups.io
Subject: Re: [BITX20] S meter wiring
 
Is it J1?

Re: S meter wiring

Ralph Mowery
 

Yes, J1.

Then go to the manager and check off the s-meter block.  Enter some numbers in the manager for each step of the smeter you want to use to get it to act the way you want it to.

On Thu, Jul 19, 2018 at 9:36 AM, Bill Carpenter <nz0tham@...> wrote:
Is it J1?


New file uploaded to BITX20@groups.io

BITX20@groups.io Notification <BITX20+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20@groups.io group.

File: AGC PD5DJ v3.brd

Uploaded By: Björn Pasteuning

Description:

You can access this file at the URL:
https://groups.io/g/BITX20/files/PD5DJ/ND6T%20AGC%20Mod%20on%20Experiment%20board/AGC%20PD5DJ%20v3.brd

Cheers,
The Groups.io Team

New file uploaded to BITX20@groups.io

BITX20@groups.io Notification <BITX20+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20@groups.io group.

File: AGC PD5DJ v3.sch

Uploaded By: Björn Pasteuning

Description:

You can access this file at the URL:
https://groups.io/g/BITX20/files/PD5DJ/ND6T%20AGC%20Mod%20on%20Experiment%20board/AGC%20PD5DJ%20v3.sch

Cheers,
The Groups.io Team