BITX20@groups.io | Messages

Re: ND6T AGC implementation for uBIT-X

Ronald Payne

I would be interested in either a board for either Size components , or a "kit" .?

Ron P

mono band 2 meters rig based on the micro BITx circuit #ubitx #2meters

my attention has turned to building a single band rig for 2 meters and I am curious who might also be interested in such a device.? my initial plan is to build the main circuit board the identical size of the uBITX and later reduce it to?within the confines of the common 20 by 4 line LCD character display.? in an attempt to build this as a Handi Talkie rig.?

-Justin N2TOH?

Re: minimum supply voltage

#47370

Good to know.

The discussion thus far is mostly about the LM7805 linear regulator on the Raduino.
The TDA2822 and LM7805 set definite max and min voltages, but nobody
really knows over what range of supply voltages the remainder of the
analog circuits in the rig will operate properly.

Show quoted text

On Thu, Apr 26, 2018 at 01:18 pm, Tim Gorman wrote:

My ubitx main board pulls about .6amp in transmit when the PA is fed
from a separate power supply.

tim ab0wr

Re: ubitx-VE1BWV/VU2SPF TIPS

Bo Barry

#47369

View on line not via the emails. Bottom right click on More. ?Lots of stuff there.

Re: minimum supply voltage

#47368

My ubitx main board pulls about .6amp in transmit when the PA is fed
from a separate power supply.

tim ab0wr

On Thu, 26 Apr 2018 11:00:23 -0700
"Jerry Gaffke via Groups.Io" <jgaffke@...> wrote:

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:



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: ND6T AGC implementation for uBIT-X

#47367

I made a board using a hobby knive. It is far larger than it needs to
be. But it works *well*!.

So put me down for 2 boards. Either 0805 or 1206 will work for me.

tim ab0wr

On Thu, 26 Apr 2018 08:44:39 -0700
"Kees T" <windy10605@...> wrote:

It appears that the ND6T implementation of an AGC fix for the uBIT-X
is a winner.?

He describes a simple X-Acto knife cut PC board for layout. Is anyone
thinking of providing a small 2 sided PC board w/wo all the parts ?

73 Kees K5BCQ

Re: ND6T AGC implementation for uBIT-X

#47366

Yes, you have plenty of experience with this.
There've been discussions in this forum before about what can and can't get posted in a letter,
so figured I'd say what little I knew for the benefit of the other kit creators.

Lots of very nice kits up at
including linear amps, bandpass filters, and of course the Vector Impedance Analyzer.
I need to place an order for a couple of your step attenuators, since I'm slowly getting serious
about figuring out EMRFD.

Jerry, KE7ER

Show quoted text

On Thu, Apr 26, 2018 at 12:35 pm, Kees T wrote:

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

Re: ND6T AGC implementation for uBIT-X

#47365

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

73?

Ken VA3ABN

Show quoted text

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

#47364

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

#47363

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

Show quoted text

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

#47362

Hi Kees

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

73

Ken VA3ABN

Show quoted text

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

#47361

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

#47360

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

#47359

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

#47358

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".
? ?

Jerry, KE7ER

Show quoted text

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 Purdum

#47357

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

uBITX_wireup V1.8.pdf

Re: Billing on BITX40

William Cullison

#47356

Ordered

Show quoted text

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

#47355

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

[email protected]

#47354

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

Re: ubitx-VE1BWV/VU2SPF TIPS

#47353

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

Show quoted text

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

开云体育