Re: uBITX Version 4 first attempt #ubitx-help #ubitx

#52621

The ubitx meets the FCC specs, so does bitx40.?

- f

Show quoted text

On Thu, Jun 21, 2018 at 8:59 AM, Kunjani Ol <loot@...> wrote:

And what are OFCOMS specs? Link please.

Re: TDA 28222

#52620

The new boards have a discrete amp. No TDA2822, no smoke.

- f

Show quoted text

On Thu, Jun 21, 2018 at 7:42 AM, JOHN CRONHELM <johncronhelm@...> wrote:

I have a new tested uBitX transceiver of the pre built type. Will it have a voltage protection for this IC included or do I have to add one?
Many thanks,
John vo1jcc.

Re: Thoughts on a Ham Bus

w7hd.rh

#52619

开云体育

I like the Atlas bus because it is intended for RF connections.? It has terminations, it has adequate pins for most potential applications, AND is off-the-shelf technology.? The test sweeps reveal a well thought out design.? Kudos to them! Ron W7HD

On 06/20/2018 07:50 PM, Jack Purdum via Groups.Io wrote:

Arv:

All tough questions, but worth answering. Think of the possibilities. Personally, I think this should be of the free-to-use license, mainly because I don't want to see extensions to the bus that aren't under someone's control. Otherwise, the standard slowly dissolves into chaos.

Every time an organization question comes up, I think of a sign I had on my desk when I was the department chairman:

??? For God so loved the world, he didn't send a committee.

Still, there has to be a small knot of knowledgeable people who know the EE and software side of this. It needs to be small because it needs to be nimble, yet with enough technical depth to make things work. I've seen the agony of trying to define a standard (i.e., the X3J11 committee to write the first standard for the C language)...it is a formidable task, and the difficult increases with the size of the committee. There are all kinds of technical details to think about and the Atlas bus would at least be a thoughtful starting point.

I think this could be a rewarding endeavor.

Jack, W8TEE

On Wednesday, June 20, 2018, 8:36:53 PM EDT, Arv Evans <arvid.evans@...> wrote:

If hams were to design and standardize a ham-bus-system approach to modular equipment,

should the design be placed in public domain, or under one of the free-to-use licenses???

Should a group be formed specifically for the purpose of bus design, documentation, and
publication?

How would upgrades, modifications, and alternative bus designs be handled?

Seems there are lots of questions, lots of possible opinions, and lots of work to do.

Arv

-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter

Re: uBITX Version 4 first attempt #ubitx-help #ubitx

#52618

And what are OFCOMS specs? Link please.

Re: Thoughts on a Ham Bus

#52617

I took part in the IETF committee on voice over IP (now RFC3261) and the Unicode standardization, it was getting teeth pulled out. That said, we have a few standards that already know of in the analog world. We have the BNC and the SMA connectors with 50 ohms interconnections. We have the 12, 5 and 3.3v supply. We don't have a control bus, but there is always the I2C. We don't have a standard software API but we do have hamlib, two or three SDR standards for sample formats.?

The good thing about standards, said Rciahrd Stevens, is that there are so many to choose from. That's the trouble!! Any attempt at protocol for radios will emerge as either cripplingly illogical like the CAT protocol or extensively overdone like the SIP protocol. What to include and what to leave out often results in such massively systems that implementing that in itself becomes a very challenging process, leave along hacking it.

The cubesat world has a physical standard, the PC104E boards. Each board is 90 mm by 95 mm with four mounting holes that are not symmetric at all (so smart, einstien!). The pinout is not defined either.?

In my lab, everything is BNC, everything is 50 ohms, everything has on-board regulators to bring things down from 12v to the required voltages. I have 10-12 of BNC pigtails, each about 6 inches. That, a pair of RF attenuators, two VOMs, a specan and the occasional Rigol DS1052E is my 'bus'. The trouble with physically standardization, it might not suit the RF layouts. For instance, an race ring mixer needs the LO, RF, IF at specific locations. They can't be moved. Instead, I have standardized on tack soldering BNC connectors exactly where I need them on the ground plane.?

- f?

Show quoted text

On Thu, Jun 21, 2018 at 8:20 AM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:

Arv:

All tough questions, but worth answering. Think of the possibilities. Personally, I think this should be of the free-to-use license, mainly because I don't want to see extensions to the bus that aren't under someone's control. Otherwise, the standard slowly dissolves into chaos.

Every time an organization question comes up, I think of a sign I had on my desk when I was the department chairman:

??? For God so loved the world, he didn't send a committee.

Still, there has to be a small knot of knowledgeable people who know the EE and software side of this. It needs to be small because it needs to be nimble, yet with enough technical depth to make things work. I've seen the agony of trying to define a standard (i.e., the X3J11 committee to write the first standard for the C language)...it is a formidable task, and the difficult increases with the size of the committee. There are all kinds of technical details to think about and the Atlas bus would at least be a thoughtful starting point.

I think this could be a rewarding endeavor.

Jack, W8TEE

On Wednesday, June 20, 2018, 8:36:53 PM EDT, Arv Evans <arvid.evans@...> wrote:

If hams were to design and standardize a ham-bus-system approach to modular equipment,
should the design be placed in public domain, or under one of the free-to-use licenses???
Should a group be formed specifically for the purpose of bus design, documentation, and
publication?
How would upgrades, modifications, and alternative bus designs be handled?

Seems there are lots of questions, lots of possible opinions, and lots of work to do.

Arv

Re: Thoughts on a Ham Bus

Steve Black

#52616

开云体育

A camel is a horse designed by committee. Steve kb1chu

On 06/20/2018 10:50 PM, Jack Purdum via Groups.Io wrote:

Show quoted text

Arv:

All tough questions, but worth answering. Think of the possibilities. Personally, I think this should be of the free-to-use license, mainly because I don't want to see extensions to the bus that aren't under someone's control. Otherwise, the standard slowly dissolves into chaos.

Every time an organization question comes up, I think of a sign I had on my desk when I was the department chairman:

??? For God so loved the world, he didn't send a committee.

Still, there has to be a small knot of knowledgeable people who know the EE and software side of this. It needs to be small because it needs to be nimble, yet with enough technical depth to make things work. I've seen the agony of trying to define a standard (i.e., the X3J11 committee to write the first standard for the C language)...it is a formidable task, and the difficult increases with the size of the committee. There are all kinds of technical details to think about and the Atlas bus would at least be a thoughtful starting point.

I think this could be a rewarding endeavor.

Jack, W8TEE

On Wednesday, June 20, 2018, 8:36:53 PM EDT, Arv Evans <arvid.evans@...> wrote:

If hams were to design and standardize a ham-bus-system approach to modular equipment,

should the design be placed in public domain, or under one of the free-to-use licenses???

Should a group be formed specifically for the purpose of bus design, documentation, and
publication?

How would upgrades, modifications, and alternative bus designs be handled?

Seems there are lots of questions, lots of possible opinions, and lots of work to do.

Arv

Re: Enclosure #parts

#52615

Hi Bob,

The box I put mine in is 6.5 X 7 X 2.75. If I put my heart into it I might make it slightly smaller. Is 8X8X3 a standard, off-the-shelf size?

73,

Bill  KU8H

Show quoted text

On 06/20/2018 08:42 PM, bdevries52@... wrote:
Bill;
The Ubtix takes a 8x8x3 box the fold down DRO is very interesting I have
a Engineer/designer son in law I will fwd this to him and see what he
comes up with, I want to take mine camping and this would work great.
Bob KA9CMH

-- 
bark less - wag more

Thoughts on a Ham Bus

Jack Purdum

#52614

Arv:

All tough questions, but worth answering. Think of the possibilities. Personally, I think this should be of the free-to-use license, mainly because I don't want to see extensions to the bus that aren't under someone's control. Otherwise, the standard slowly dissolves into chaos.

Every time an organization question comes up, I think of a sign I had on my desk when I was the department chairman:

??? For God so loved the world, he didn't send a committee.

Still, there has to be a small knot of knowledgeable people who know the EE and software side of this. It needs to be small because it needs to be nimble, yet with enough technical depth to make things work. I've seen the agony of trying to define a standard (i.e., the X3J11 committee to write the first standard for the C language)...it is a formidable task, and the difficult increases with the size of the committee. There are all kinds of technical details to think about and the Atlas bus would at least be a thoughtful starting point.

I think this could be a rewarding endeavor.

Jack, W8TEE

On Wednesday, June 20, 2018, 8:36:53 PM EDT, Arv Evans <arvid.evans@...> wrote:

If hams were to design and standardize a ham-bus-system approach to modular equipment,

should the design be placed in public domain, or under one of the free-to-use licenses???

Should a group be formed specifically for the purpose of bus design, documentation, and
publication?

How would upgrades, modifications, and alternative bus designs be handled?

Seems there are lots of questions, lots of possible opinions, and lots of work to do.

Arv

Re: Homebrew from scratch #ubitx

#52613

My dad is an EE and worked for fm and am broadcast stations around Tampa Florida.?

I recall him working on a fm exciter one of the djs were using as a pirate transmitter. The boards all plugged in as described here and had rails built in to the side of the chase. From what I have read that seems to be what you guys are talking about.

kf4ftr

Re: Homebrew from scratch #ubitx

James Lynes

#52612

Form an IEEE committee!

Control bus signal conflicts would be a challenge as they are when you try to stack the third Arduino shield designed by different groups.

Also add a clock bus. At least 3 clocks for the uBitx. And the pin count grows...

James

Re: ND6T AGC and Click kit wiring notes

#52611

Please see the "Files" section listed in the next note, below. All info is there.

73 Kees K5BCQ

Re: Homebrew from scratch #ubitx

Jack Purdum

#52610

This is a good point of discussion.

Jack, W8TEE

On Wednesday, June 20, 2018, 8:38:24 PM EDT, tdelozie via Groups.Io <tdelozie@...> wrote:

TAPR has a kits for the HDSDR project which has a bus board called Atlas. Perhaps it could further inspire a hambus. The documentation at the bottom of the kit page describes it in detail.?

Re: uBitx Easy Digi hookup advice? #ubitx

#52609

Hi Doug,

I used your method with great success. I did however, substitute R3 with a 1k pot connecting the wiper to C1. I wanted to be able to use an amplifier on digital but not at full uBitx power. This works to allow me to go from 0 to max out on the amp.

73, Dennis
W7DRW

TDA 28222

JOHN CRONHELM

#52608

I have a new tested uBitX transceiver of the pre built type. Will it have a voltage protection for this IC included or do I have to add one?
Many thanks,
John vo1jcc.

Re: uBitX CW Sidetone Volume

#52607

开云体育

Mark I replaced R250 with a 10k trimpot to set the level. R250 is located at the front of the main board at the right edge of the Raduino board.

Skip Davis, NC9O?

Show quoted text

On Jun 20, 2018, at 20:16, Mark M <junquemaile@...> wrote:

I find the CW sidetone on my uBitX V3 to be annoyingly loud. Any suggestions on how to quiet it down? I'm running Ian's 1.08 firmware.

Thanks...? ? ? Mark? ? AA7TA

Re: Homebrew from scratch #ubitx

James Lynes

#52606

I suspect that some of our 3D printer gurus could come up with a card cage to mount the motherboard to.

I used a lot of Prolog STD-BUS products a long time ago and they had very nice plastic card cages in 2, 4, 8, 12, and 16 slots. Slot spacing needs a good think to allow spacing for anticipated component heights. I'm thinking 3/4 to 1 inch. Probably 4 or 8 slots to begin with.

I do not pretend to know the best arrangement of signals(software guy), but I'm sure it will require a mingling of ground traces to minimize cross-talk and doubled traces on power buses.

I was thinking of using the small sized stripboards as the card form factor.

Lots of possibilities. Standards are so great since there are so many of them.

James

Re: ND6T AGC and Click kit wiring notes

chris gress

#52605

How do you order these boards is there a web page chris in the uk

Show quoted text

On Wed, 20 Jun 2018, 21:06 Kees T, <windy10605@...> wrote:

Link to the Photos??/g/BITX20/album?id=42154
Link to the Files? ?/g/BITX20/files/K5BCQ

73 Kees K5BCQ

Re: uBitX CW Sidetone Volume

#52604

The sidetone level is dependant on the level of the volume control, so as a temporary fix you could turn your volume down slightly when you start sending and then readjust it on RX.?

A permanent solution might be to try increasing the value of R253 (currently 1K). It is near Crystal X1 and the Audio connector. ?

Michael VE3WMB?

Re: Enclosure #parts

#52603

Bill;
The Ubtix takes a 8x8x3 box the fold down DRO is very interesting I have a Engineer/designer son in law I will fwd this to him and see what he comes up with, I want to take mine camping and this would work great.
Bob KA9CMH

Re: Homebrew from scratch #ubitx

#52602

TAPR has a kits for the HDSDR project which has a bus board called Atlas. Perhaps it could further inspire a hambus. The documentation at the bottom of the kit page describes it in detail.?