Re: WANTED VK3YE LED LDR AGC diagram

#28333

oops. sorry Phill i wanted to show you it working tonight unfortunately it doesn't want to seem to play. i will have another go over the weekend.in your picture the audio in goes from the other side to the resistor than in the wiring diagram. the problem I'm having is if i leave the meter in the led is alight all the time so i took that out. if i just connect the audio wires i have audio. i can see why that is as it just goes straight back to it with out passing through anything other than the trim pot. at this point if i connect the power leads it cuts out any audio regardless of the volume control. might going about it the wrong way so ill leave it till the weekend?
huw

Re: New version of Si5351mcu and pull request to Allard's bitx40 on the oven.

Vince Vielhaber

#28332

2 of 3 may be a problem for the uBitX.  It uses all three clocks.

Vince.

Show quoted text

On 06/15/2017 04:46 PM, Pavel Milanes Costa wrote:
Hi group, I'm back.

Do you rememeber the pull request to switch from the etherkit Si5351 lib
(from NT7S) to my new Si5351mcu?

After a tough revision of the code I found that the error that make the
code a no-go was related two main factors:

  * I2C initialization.
  * Human error.

I develop mainly on the house desktop PC but use the laptop to connect
and upload the code to the internet; this resulted in wrong (incomplete)
code uploaded to the github repository. (shame on me.)

A bug on the correction procedure was found & fixed, the init procedures
are now mandatory and a general update to the documentation on the code
coments and Readme.md was made.

A new version (0.3) of the Si5351mcu library for arduino and flavours
was pushed to the github repository a minute ago
() you can just click the green
download button or go to the releases tab and grab it from there.

I have the bitx40 code now working back in home with a real Raduino +
Bitx40v3 SMD, but it's working against Allards code version 1.13, I will
update it tonight against lastest 1.14.1 and fill a push request tomorrow.

Firmware & sram reduction waranted.

73 de Pavel CO7WT.

-- 
  Michigan VHF Corp.      
                          

Re: Bitx40: A couple of questions on CW using Allard's code

#28331

As per the second paragraph of post 28316?

There are diode arraays designed specifically for ESD protection.
???

If we have few problems now with no protection, adding a 1k series resistor is likely sufficient.
Though if you draw sparks after walking across the rug, the voltages and currents can be disturbingly large.
Some of the ESD models assume kilovolts and amps are involved, but only for a few billionths of seconds:

Jerry

Show quoted text

On Thu, Jun 15, 2017 at 01:34 pm, Michael Hagen wrote:

To protect an input you can put a series resistor to limit current, then a diode on the input to +V and another to ground.

New version of Si5351mcu and pull request to Allard's bitx40 on the oven.

Pavel Milanes Costa

#28330

开云体育

Hi group, I'm back.

Do you rememeber the pull request to switch from the etherkit Si5351 lib (from NT7S) to my new Si5351mcu?

After a tough revision of the code I found that the error that make the code a no-go was related two main factors:

I2C initialization.
Human error.

I develop mainly on the house desktop PC but use the laptop to connect and upload the code to the internet; this resulted in wrong (incomplete) code uploaded to the github repository. (shame on me.)

A bug on the correction procedure was found & fixed, the init procedures are now mandatory and a general update to the documentation on the code coments and Readme.md was made.

A new version (0.3) of the Si5351mcu library for arduino and flavours was pushed to the github repository a minute ago () you can just click the green download button or go to the releases tab and grab it from there.

I have the bitx40 code now working back in home with a real Raduino + Bitx40v3 SMD, but it's working against Allards code version 1.13, I will update it tonight against lastest 1.14.1 and fill a push request tomorrow.

Firmware & sram reduction waranted.

73 de Pavel CO7WT.

Re: Bitx40: A couple of questions on CW using Allard's code

#28329

开云体育

To protect an input you can put a series resistor to limit current, then a diode on the input to +V and another to ground.

Over positive voltages get clamped to +V and negatives shunted to ground.

I have done this a lot for wires that go out to a user.

Mike,WA6ISP

On 6/15/2017 11:37 AM, Michael Babineau wrote:

Show quoted text

Allard ... this is excellent ... exactly what I was hoping for. ?Thanks for the quick response !?

My thoughts on ?ESD protection for the key line were that it would be easier to do something
like to add ?Zener diode than to have to replace the soldered-in Arduino Nano on the Raduino board?
(i.e. a situation where an ounce of prevention is worth a pound of cure).

Cheers

Michael VE3WMB?

Re: uk customs

M Garza

#28328

Jack,

What's the title?? My wife would love to read that.

Marco - KG5PRT?

Show quoted text

On Jun 15, 2017 2:11 PM, "Jack Purdum via Groups.Io" <econjack=[email protected]> wrote:

Probably, but most don't know that my Ph.D. is in economics, not CS, so I always have an interest in such stuff. BTW, if anyone wants to read about the internal rate of return on 18th century Parliamentary land enclosures for five Nottinghamshire manors, just let me know.

Jack, W8TEE

From: Jerry Gaffke via Groups.Io <jgaffke=[email protected]>
To: [email protected]
Sent: Thursday, June 15, 2017 2:28 PM
Subject: Re: [BITX20] uk customs

Jack,
You're taking me way too seriously!
Jerry

On Thu, Jun 15, 2017 at 11:22 am, Jack Purdum wrote:

I didn't follow this:

?

? ???but then wouldn't the US would have high customs charges for stuff originating here too?

Re: New Order

#28327

Very nice looking rig. What are its dimensions? ?Does the tilting bar allow swinging back underneath to back over the top for use as a carrying handle too? ?Thx for your prompt reply.?

KJ4FFG

Ron

Show quoted text

On Thursday, June 15, 2017, 02:44, EA3IAV <Cesarleon@...> wrote:

I have this one. Enough room and the nice tilting bar feature. You will have to drill holes for the speaker. You may use different panels as the fron and rear are detachable. They are only with a sliding panel.
I suggest you shield it with this tape or something like that?

Re: uk customs

Jack Purdum

#28326

Probably, but most don't know that my Ph.D. is in economics, not CS, so I always have an interest in such stuff. BTW, if anyone wants to read about the internal rate of return on 18th century Parliamentary land enclosures for five Nottinghamshire manors, just let me know.

Jack, W8TEE

Show quoted text

From: Jerry Gaffke via Groups.Io <jgaffke@...>
To: [email protected]
Sent: Thursday, June 15, 2017 2:28 PM
Subject: Re: [BITX20] uk customs

Jack,
You're taking me way too seriously!
Jerry

On Thu, Jun 15, 2017 at 11:22 am, Jack Purdum wrote:

I didn't follow this:

?

? ???but then wouldn't the US would have high customs charges for stuff originating here too?

Re: Bitx40: A couple of questions on CW using Allard's code

#28325

Allard ... this is excellent ... exactly what I was hoping for. ?Thanks for the quick response !?

My thoughts on ?ESD protection for the key line were that it would be easier to do something
like to add ?Zener diode than to have to replace the soldered-in Arduino Nano on the Raduino board?
(i.e. a situation where an ounce of prevention is worth a pound of cure).

Cheers

Michael VE3WMB?

Re: uk customs

#28324

Jack,
You're taking me way too seriously!
Jerry

Show quoted text

On Thu, Jun 15, 2017 at 11:22 am, Jack Purdum wrote:

I didn't follow this:

?

? ???but then wouldn't the US would have high customs charges for stuff originating here too?

Re: uk customs

Jack Purdum

#28323

Jerry:

I didn't follow this:

? ???but then wouldn't the US would have high customs charges for stuff originating here too?

The last thing the US wants to do is make our goods higher in price. I understand the "admin fee" mentality. We had an agency in the US gov't that subsidized tung nut oil production, paying out about $37,000/year in subsidies. It cost $1.5m to run the agency. " 'Splain that to me, Lucy. "

Jack, W8TEE

Show quoted text

From: Phil Edwards <phil.g8yqk@...>
To: [email protected]
Sent: Thursday, June 15, 2017 1:47 PM
Subject: Re: [BITX20] uk customs

The bulk of the charge will be RM's "admin fee" for collection and processing the duty.

73

Phil ?(G8YQK)

On 15 Jun 2017 18:37, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

At the risk of stepping deeply into it: ?
? Maybe, but then wouldn't the US would have high customs charges for stuff originating here too?

Jerry
?

On Thu, Jun 15, 2017 at 10:07 am, Jack Purdum wrote:

Perhaps it's because the British gov't doesn't like Trump?

Virus-free.

Re: uk customs

#28322

The bulk of the charge will be RM's "admin fee" for collection and processing the duty.

73

Phil ?(G8YQK)

Show quoted text

On 15 Jun 2017 18:37, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

At the risk of stepping deeply into it: ?
? Maybe, but then wouldn't the US would have high customs charges for stuff originating here too?

Jerry
?

On Thu, Jun 15, 2017 at 10:07 am, Jack Purdum wrote:

Perhaps it's because the British gov't doesn't like Trump?

Re: uk customs

#28321

At the risk of stepping deeply into it: ?
? Maybe, but then wouldn't the US would have high customs charges for stuff originating here too?

Jerry
?

Show quoted text

On Thu, Jun 15, 2017 at 10:07 am, Jack Purdum wrote:

Perhaps it's because the British gov't doesn't like Trump?

Re: uk customs

#28320

Terry

Below a certain value, there is no duty to pay. You should be able to get the figure from the Inland Revenue or Customs & Excise website.?

I believe the Royal Mail can be a little lax in their collection of taxes & duties but would have thought that $20?would be below the threshold. May be worth checking it out and seeking a refund if you still have the paperwork.

73

Phil (G8YQK)

Show quoted text

On 15 Jun 2017 18:07, "Jack Purdum via Groups.Io" <econjack=[email protected]> wrote:

Perhaps it's because the British gov't doesn't like Trump?

Jack, W8TEE

From: terryhugheskirkcudbright via Groups.Io <terryhugheskirkcudbright=yaho[email protected]>
To: [email protected]
Sent: Thursday, June 15, 2017 12:04 PM
Subject: Re: [BITX20] uk customs

hi
can anybody explain the peculiarities of uk customs.

i ordered a dummy load from usa at a cost of about $20 and royal mail charged me ?14 for duty and admin but i ordered my bitx40? from india for $59 and no duty was charged.

does uk customs have an agreement with india

terry

Re: uk customs

Jack Purdum

#28319

Perhaps it's because the British gov't doesn't like Trump?

Jack, W8TEE

Show quoted text

From: terryhugheskirkcudbright via Groups.Io <terryhugheskirkcudbright@...>
To: [email protected]
Sent: Thursday, June 15, 2017 12:04 PM
Subject: Re: [BITX20] uk customs

hi
can anybody explain the peculiarities of uk customs.

i ordered a dummy load from usa at a cost of about $20 and royal mail charged me ?14 for duty and admin but i ordered my bitx40? from india for $59 and no duty was charged.

does uk customs have an agreement with india

terry

Re: uk customs

#28318

hi
can anybody explain the peculiarities of uk customs.

i ordered a dummy load from usa at a cost of about $20 and royal mail charged me ?14 for duty and admin but i ordered my bitx40? from india for $59 and no duty was charged.

does uk customs have an agreement with india

terry

Re: Bitx40: A couple of questions on CW using Allard's code

#28317

Really really small ones. ?
Don't take me too seriously.

Show quoted text

On Thu, Jun 15, 2017 at 08:46 am, Jerry Gaffke wrote:

That plus the series 10k and this thing should take direct hits from lightning bolts.

?

Re: Bitx40: A couple of questions on CW using Allard's code

#28316

A series resistor of 1k between your key jack and the Nano's A1 should offer plenty of ESD protection.
The Nano's internal pullup to 5v is a minimum of 30k, so when you ground it at the key jack the Nano will see a maximum of 5v * 1k/(1k+30k) = 0.16 volts.
If the series resistor were 10k, Nano sees a maximum of 1.25 volts. ?Should still work assuming I read the datasheet correctly but is getting kind of scary.

If you really want to use diodes, the Bat54s dual shottky's are ideal. ?Tie A1 to the middle node of the Bat54s, and GND and 5v to the outside ends such?
that the diodes are normally reverse biased. ?That plus the series 10k and this thing should take direct hits from lightning bolts.
For a high impedance node such as this where we can get by with a high value series resistor, I'd go with just the series resistor.

Jerry, KE7ER

Show quoted text

On Thu, Jun 15, 2017 at 08:23 am, Allard PE1NWL wrote:

Extra protection wouldn't do any harm. A zener diode might work, perhaps
there are better methods, haven't thought about this yet.

?

Re: Bitx40: A couple of questions on CW using Allard's code

#28315

Michael,

see answers below:

Does the Sidetone frequency setting for CW in Allard's code just adjust
the audible sidetone or does the TX Offset for CW actually
track this sidetone setting as well ? ??If not, ??this would be a really
nice enhancement.This is already implemented. Changing the sidetone frequency not only
affects the audible sidetone but the actual RX offset (not TX offset!) as
well.

I have an ??SotaBeams DSP filter module which has narrow SSB and CW
filtering but the CW filter passband is centered
on 600 Hz and the skirts are quite steep so ideally I want to be listening
to a 600 Hz signal (i.e. have a 600 Hz TX offset) and??
have a matching sidetone frequency so that neither is attenuated by the
filter. ??I guess if the current TX offset is fixed
to some other value I can??just change it to 600 hz and recompile the
sketch.??That wouldn't be neccessary. Just change the sidetone frequency to 600Hz
in the SETTINGS menu.

Extra note: I'm currently working on v1.15 featuring true RIT control that
allows you to do fine tuning during RX while keeping the TX frequency the
same. This may be useful especially for CW. To be released shortly.


A second question. From what I can see the A1 (key line) on Raduino
connector P1 is grounded to send CW. ??
I am wondering if??perhaps it might be a good idea to install a ??zener
diode to ground on the key line to help protect the Arduino from ESD ????
(I have seen this done in other kits).??
Extra protection wouldn't do any harm. A zener diode might work, perhaps
there are better methods, haven't thought about this yet.

Re: Drilling template for 2 to 3 inch speaker

#28314

A friend used a piece of steel mesh with round holes punched in it. He then clamped the mesh to his front panel and used a drill press to drill every hole he wanted (the drill bit passes through the holes easily and the mesh centers the drill bit). The result is very professional looking. The rim of the speaker is glued inside the case.