Date   
Re: ND6T AGC implementation for uBIT-X

Ken
 

Heck I'll pay the extra postage ($10,000,000.00 CAD) to get it here.

73 

Ken VA3ABN

On Thu, Apr 26, 2018 at 3:57 PM, Kees T <windy10605@...> wrote:
Ken,

Canada eh  ....sure, as long as postage is covered. Will require a customs short form. Since starting this low buck kit activity, after retirement in 1998, I've shipped 3987 kits as of today, all over the world. 

Waiting to see what Ion, VA3NOI is wanting to do and what Don, ND6T says since it's his design and all questions, accolades, gripes, blame, etc.  go back to him (and it's his call that would be silkscreened on the board). 

I like Jerry's comment;     "That sounds great! I for one would be happy enough at $10 if it saves me a day of messing around 
with Mouser orders and Xacto knife emergency room visits."

73 Kees K5BCQ


Re: ND6T AGC implementation for uBIT-X

Kees T
 

Ken,

Canada eh  ....sure, as long as postage is covered. Will require a customs short form. Since starting this low buck kit activity, after retirement in 1998, I've shipped 3987 kits as of today, all over the world. 

Waiting to see what Ion, VA3NOI is wanting to do and what Don, ND6T says since it's his design and all questions, accolades, gripes, blame, etc.  go back to him (and it's his call that would be silkscreened on the board). 

I like Jerry's comment;     "That sounds great! I for one would be happy enough at $10 if it saves me a day of messing around 
with Mouser orders and Xacto knife emergency room visits."

73 Kees K5BCQ

Re: ND6T AGC implementation for uBIT-X

walt hodges
 

I will order 2 boards when available.  Please sign me up.

On Thu, Apr 26, 2018 at 2:35 PM, Kees T <windy10605@...> wrote:
OK, I was wondering when Don, ND6T, would "check in". I don't want to step on anyone's toes, so I'm also awaiting response from Ion and Don.

I've been producing small kits since I retired in 1998.....and the object is to have fun and keep the costs as low as possible, after all this is a hobby. Don's AGC circuit seems like a good candidate.

Jerry, I believe I can get all those parts in a standard envelope and mail it for $0.50. I've done it before.

73 Kees K5BCQ

I would be focussed on using 0805 SMT parts,

1

 

 

PC board

 

1

Q1

MMBT2222

NPN

SOT-23

2

Q2,Q3

2N7002

FET

SOT-23

2

D1,D2

1N4148

Diode

805 size

4

R1,R3,R4,R5

 

100K resistor

805 size

1

R2

 

1K resistor

805 size

1

R6

 

1M resistor

805 size

2

C3,C5

Ceramic

10nF capacitor

805 size

2

C1,C2

Ceramic

100nF capacitor

805 size

1

C4

Tantalum

1uF capacitor

805 size


Re: ND6T AGC implementation for uBIT-X

Ken
 

Hi Kees

If you become the candidate for the kits, will you be shipping to Canada eh!

73
Ken VA3ABN

On Thu, Apr 26, 2018 at 3:35 PM, Kees T <windy10605@...> wrote:
OK, I was wondering when Don, ND6T, would "check in". I don't want to step on anyone's toes, so I'm also awaiting response from Ion and Don.

I've been producing small kits since I retired in 1998.....and the object is to have fun and keep the costs as low as possible, after all this is a hobby. Don's AGC circuit seems like a good candidate.

Jerry, I believe I can get all those parts in a standard envelope and mail it for $0.50. I've done it before.

73 Kees K5BCQ

I would be focussed on using 0805 SMT parts,

1

 

 

PC board

 

1

Q1

MMBT2222

NPN

SOT-23

2

Q2,Q3

2N7002

FET

SOT-23

2

D1,D2

1N4148

Diode

805 size

4

R1,R3,R4,R5

 

100K resistor

805 size

1

R2

 

1K resistor

805 size

1

R6

 

1M resistor

805 size

2

C3,C5

Ceramic

10nF capacitor

805 size

2

C1,C2

Ceramic

100nF capacitor

805 size

1

C4

Tantalum

1uF capacitor

805 size


Re: ND6T AGC implementation for uBIT-X

Kees T
 

OK, I was wondering when Don, ND6T, would "check in". I don't want to step on anyone's toes, so I'm also awaiting response from Ion and Don.

I've been producing small kits since I retired in 1998.....and the object is to have fun and keep the costs as low as possible, after all this is a hobby. Don's AGC circuit seems like a good candidate.

Jerry, I believe I can get all those parts in a standard envelope and mail it for $0.50. I've done it before.

73 Kees K5BCQ

I would be focussed on using 0805 SMT parts,

1

 

 

PC board

 

1

Q1

MMBT2222

NPN

SOT-23

2

Q2,Q3

2N7002

FET

SOT-23

2

D1,D2

1N4148

Diode

805 size

4

R1,R3,R4,R5

 

100K resistor

805 size

1

R2

 

1K resistor

805 size

1

R6

 

1M resistor

805 size

2

C3,C5

Ceramic

10nF capacitor

805 size

2

C1,C2

Ceramic

100nF capacitor

805 size

1

C4

Tantalum

1uF capacitor

805 size

BITX QSO Afternoon/Evening, Sunday, April 29, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

BITX QSO Afternoon/Evening, Sunday, April 29, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Join us as we make contacts from BITX40 to BITX40 on 7.277 MHz in 40 meters!

This is a worldwide event for BITX40 stations starting at 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: ND6T AGC implementation for uBIT-X

Don, ND6T
 

Ion, VA3NOI, did a very nice layout and I believe that he is awaiting his first boards. He mentioned that he might also be doing some SMD boards, too. I'm sure that I will be hearing from him soon.
73, Don

Re: ND6T AGC implementation for uBIT-X

Jerry Gaffke
 

That sounds great!
I for one would be happy enough at $10 if it saves me a day of messing around
with Mouser orders and Xacto knife emergency room visits.

Maybe send it out in an envelope with all parts mounted to a piece of card stock,
holes punched in the card to accommodate any thicker parts.

Machine jams are likely their primary concern when determining what's a letter.
Well, that and the obvious height, width, depth and weight measurements.
A 31 mil thick board might be less likely to jam their letter sorting (and shredding) machines
than a standard 62 mil board.  With that and 0201 surface mount parts, we should be just fine.   ;-)

Here's a FAQ from the USPS, note the 12 hits when searching for the word "machinable".
   https://about.usps.com/postal-bulletin/2007/html/pb22218/kit1_021.html

Jerry, KE7ER



On Thu, Apr 26, 2018 at 10:30 am, Kees T wrote:
I figure a bare PC board could be sent in the USA for $1. postpaid....... and a complete kit of parts for $3. postpaid as long as it can be mailed in a letter envelope and we avoid PayPal fees.  

Re: Electrical scheme last version #bitx40help

Jack, W8TEE
 

See attached.

Jack, W8TEE


On Thursday, April 26, 2018, 2:22:16 PM EDT, SaMa photo SaMa photo <infosamaphoto@...> wrote:


Good morning
where can I download the wiring diagram of the latest version of the BITX40?
The link on the site does not work:
http://www.hfsigs.com/bitx_with_raduino.zip
and the one exposed here:
http://www.hfsignals.com/index.php/2017/11/23/bitx40-circuit-description/
it is not correct and does not correspond to my motherboard.
Thank you
Sergio

Re: Billing on BITX40

William Cullison
 

Ordered


On Thu, Apr 26, 2018, 14:09 <n2tmc@...> wrote:
When does PayPal get billed? When the order is received or when it shipped. 

Electrical scheme last version #bitx40help

SaMa photo SaMa photo
 

Good morning
where can I download the wiring diagram of the latest version of the BITX40?
The link on the site does not work:
http://www.hfsigs.com/bitx_with_raduino.zip
and the one exposed here:
http://www.hfsignals.com/index.php/2017/11/23/bitx40-circuit-description/
it is not correct and does not correspond to my motherboard.
Thank you
Sergio

Billing on BITX40

n2tmc@...
 

When does PayPal get billed? When the order is received or when it shipped. 

Re: ubitx-VE1BWV/VU2SPF TIPS

Joe
 

I have many types etc, but the 2.8 Elegoo for arduino has been consistently the best. 
 Very clear crisp display, and sensitive touch control.
I purchased   4 or 5 OF them from Amazon.com or ca and they have performed perfectly each time.

The  youtube link to my latest video which shows my ubitx rig and all about the tft touch display and source etc



Also other sources for info


Joe
VE1BWV

On Thu, Apr 26, 2018 at 11:07 AM, Rob Bleumer <Bleumer@...> wrote:
Could you tel me where you got the TFT display  or the spec's.
Thanks!
Rob PA0RBL


Re: minimum supply voltage

Jerry Gaffke
 

The board is designed to operate at 12v.
I doubt it will work very well at 6v.

That said, in answer to your question, an LM2940-5 has a lower dropout voltage than the LM7805:
  http://www.ti.com/lit/ds/symlink/lm2940c.pdf
  http://www.ti.com/lit/ds/symlink/lm340.pdf

The "Dropout Voltage" at the bottom of page 5 of the LM2940c datasheet says worst case at 1 Amp is 1 Volt.
But the Raduino pulls far less than 1 Amp, likely well under a half volt.  So would work with 5.5v going in.

Near the bottom of page 6 of the second datasheet above (covers both LM340 and LM7805)
it says the "Dropout Voltage" is "typically" 2 volts at 1 Amp, they don't give a worst case.
Will probably be less than 2v since the Raduino is not pulling much current, but you'd be on very
shaky ground if trying to feed it only 6v.

Jerry, KE7ER


On Thu, Apr 26, 2018 at 09:35 am, vajra guru wrote:
Have received my uBITx but haven't started assembling yet... I was thinking along similar lines, using 6V to power the board, and using 24V for the PA... Does it make sense to change out the 7805 voltage regulator for something different to make this work? Thx, Calvin VE3EIT

Re: No PTT

Jerry Gaffke
 

That's how we all learn!

Might be time to place an order for a new Nano such as one of these, the first one comes with the Mini-B USB cable:
    https://www.banggood.com/ATmega328P-Arduino-Compatible-Nano-V3-Improved-Version-With-USB-Cable-p-933647.html?rmmds=buy&cur_warehouse=CN
    https://www.banggood.com/ATmega328P-Nano-V3-Controller-Board-Compatible-Arduino-p-940937.html?rmmds=buy&cur_warehouse=CN
    http://www.oddwires.com/nano-3-low-cost-arduino-compatible-assembled-and-with-cable/
With Banggood, selecting the "CN" warehouse means it is shipped from China, they also have US and UK warehouses for some items.
There are cheaper sources, though I don't mind giving an established vendor an extra dollar
on the assumption that they do a better job of quality control, might save me a day of hair pulling.
I suggest you get two or three Nano's, they are very fun to play with.

Once you can download firmware to the Nano using the step by step instructions provided in this forum,
it is very easy to make minor adjustments to example programs and have the Nano do new tricks.
It may take some time to get a host computer set up with the Arduino IDE, and configured to
talk to the Nano over a USB cable.  But it is a very valuable and useful learning experience.
Even if your Nano did not blow, you would want to do this so you can upgrade the firmware
to some of the newer and better uBitx firmware described in this forum.

Make sure you get a good Mini-B USB cable for your Nano.
Many such cables only have power and ground wires for charging a cell phone perhaps, no data lines.

Some folks have been socketing the Nano when they add it to the Raduino
so it's easier to swap the next time it blows.

The Nano is easier to program than a ZX81, I had one of those back in the early 80's.
Best of all, with the Nano you won't need to find a cassette tape deck that still works.

Jerry, KE7ER


On Thu, Apr 26, 2018 at 09:26 am, Geoff Theasby wrote:
It is entirely possible that 12 volts has been inappropriately applied. I did find the odd wiring error.
It was working, briefly, immediately after 'tune up'. So I have no doubt it was shipped in working order.  
I shall apply your idea for pull-up resistors (Tomorrow - I am rather tired now)

Re: ND6T AGC implementation for uBIT-X

 

Ditto, size 1206 SMD would be nice.

Joel
N6ALT

Re: ND6T AGC implementation for uBIT-X

Kees T
 

I figure a bare PC board could be sent in the USA for $1. postpaid....... and a complete kit of parts for $3. postpaid as long as it can be mailed in a letter envelope and we avoid PayPal fees.  

73 Kees K5BCQ

Re: Let the magic smoke out of my bitx40

Allard PE1NWL
 

On Thu, Apr 26, 2018 at 10:13 am, <davesters@...> wrote:
I think I am going to increase the delay in the stepping. So I can keep up with it better.
You can easily increase the delay at line 70:

49// Function Button
#define CLICK_DELAY 1500          // max time (in ms) between function button clicks

Re: minimum supply voltage

Jack, W8TEE
 

I thought the input voltage (e.g., 7V) had to be at least 2V greater than the output voltage (5V), or is that only for buck converters. (Software guy here...not hardware.)

Jack, W8TEE


On Thursday, April 26, 2018, 12:35:48 PM EDT, vajra guru <vajraguru99@...> wrote:


Have received my uBITx but haven't started assembling yet... I was thinking along similar lines, using 6V to power the board, and using 24V for the PA... Does it make sense to change out the 7805 voltage regulator for something different to make this work? Thx, Calvin VE3EIT

On Thursday, April 26, 2018, Skip Davis via Groups.Io <skipnc9o=yahoo.com@groups.io> wrote:
Sarma, if we look at setting up the uBITX for a minimal supply voltage operation we will need to also include minimal dropout regulators to the RF amplifier stages too. Then the resistors values will need to be recalculate for all stages to maintain the gain throughout the bidirectional RF amplifiers. This sounds like an interesting idea try.

Skip Davis, NC9O 

On Apr 26, 2018, at 01:20, Mvs Sarma <mvssarma@...> wrote:

We need to study the minimum voltage needed for relay operation. If we can change the relays to5V type, and use a LDO regulator on raduino, we can work at 6V battery for the rig except that we may have to provide higher voltage for the HF linear  final section. May be, the bias arrangements of the pre-amp, driver and power amp need to be tweaked.

regards
 sarma
 vu3zmv

Regards
MVS Sarma
 

On Thu, Apr 26, 2018 at 12:24 AM, Matthew Stevens <matthew@...> wrote:
Apologies if this has been answered before, but I can't find it anywhere. I know the max recommended supply voltage is 15v. But, what is the minimum recommended? I have a 9.9v lithium pack I was thinking about re-purposing for a /p power supply.

73

--
- Matthew nj4y





Re: Let the magic smoke out of my bitx40

_Dave_ AD0B
 

Thank you so much for the concise list of instructions. I had most of it figured out but obviously had not figured out that I didn't need need the red wire.

I actually blew out a second arduino when I touched the function button with the unit turned off. Must have had a cap discharge, the display went on for a second and the second nano quit. 

As a precaution I put a 1k resistor between the ground and the function switch. 

I think I am going to increase the delay in the stepping. So I can keep up with it better. Would like to try a ten turn pot. 

Am learning ditties so that will be implemented later on. 
Regards 
Dave
K0MBT