Re: Bitx40: A couple of questions on CW using Allard's code
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:
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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?
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Jack, What's the title?? My wife would love to read that.
Marco - KG5PRT?
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
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?
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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
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?
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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@...>
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?
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Re: Bitx40: A couple of questions on CW using Allard's code
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?
|
Jack,
You're taking me way too seriously!
Jerry
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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?
|
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
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)
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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?
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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
?
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On Thu, Jun 15, 2017 at 10:07 am, Jack Purdum wrote:
Perhaps it's because the British gov't doesn't like Trump?
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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)
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
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
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Perhaps it's because the British gov't doesn't like Trump?
Jack, W8TEE
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
|
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
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Re: Bitx40: A couple of questions on CW using Allard's code
Really really small ones. ?
Don't take me too seriously.
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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.
?
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Re: Bitx40: A couple of questions on CW using Allard's code
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
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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.
?
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Re: Bitx40: A couple of questions on CW using Allard's code
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.
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Re: Drilling template for 2 to 3 inch speaker
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. 
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Re: Drilling template for 2 to 3 inch speaker
I painted mine with layout dye (Dykem) and scratched a grid into it. At the intersections I hit it with a punch then used a hand hole punch to poke the holes. Alcohol removes the layout dye. That's just a temporary front panel as I decide what it's going to have and look like as a final product. The end result panel will be too thick to hand punch (0.100") so I'll have to drill it. I had to mill the slot for the display, even in the thin 0.035" aluminum I'm using as a temp panel.
Vince.
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On 06/15/2017 08:37 AM, Michael Babineau wrote: Not wanting to re-invent the wheel ... has anyone come up with a
template for drilling holes in an enclosure for a 2 to 3 inch speaker ?
I was hoping to find something that I could print out and tape to the
outside of the enclosure to use as a guide for drilling sound
holes in a regular pattern for a 3 inch speaker.
If not, I will see what I can come up with and I will post to the group.
Cheers
Michael VE3WMB
--
Michigan VHF Corp.
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Bitx40: A couple of questions on CW using Allard's code
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.?
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.?
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).?
Cheers
Michael VE3WMB?
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Re: BITX operator map is now locked down
On Thu, Jun 15, 2017 at 03:55 am, Ashhar Farhan wrote:
is there an api that we can use setup a separate add-only page?
It doesn't look like it or if there is it is beyond my knowledge.? I would be very happy to see someone else come up with a better way to do this.? The map and sign up system on WSPRnet.org is great if anyone has those kind of abilities I would gladly hand over the keys.? I am still surprised how quickly this took off.? I don't mind doing the manual work of adding operators for now.? It is a very small effort to help pay back all the knowledge I have gained from this community.
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hi
my problem is that i am not competent to solder the connection to a smd capacitor.
terry
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Allard PE1NWL