Date   
Re: IRF510 amplifier failures

n5ib_2
 

One other possibility to consider to protect against overcurrent situations is to use a current limiting power supply, or add a current limiter to an existing power supply or battery.

The current limiter circuit whose link is at this site:
<http://n5ib.net/Index.xht>
will go up to 2.2 amps, and includes a low-dropout voltage regulator that also provides reverse polarity protection.

There is a version, in a different package, of that same regulator chip that has an added "tracking" feature - being able to parallel multiple chips to increase the available current. Details are on the datasheet in the document.

Jim, N5IB

Re: Lost in Customs?

DJ4MU
 

On Fri, Jan 26, 2018 at 04:57 am, Gernot W. Volkland wrote:

Did you try 2 contact DHL via 0228 4333118 also ?

Yes, that's where i got the information about arrival in Germany and when it went into customs (01/02/18) from.
Sadly they deny any responsibility and ability to help after that.

batch shipping

crofter
 

have hfsignals a shipping date on orders placed late january

thanks
crofter

Apache Case on Sale

Jack, W8TEE
 

All:

Harbor Freight has their small Apache chase on sale for the month of February. Inside dimensions are:

   Length: 8-3/8"
    Height: 3-3/4"
     Width: 5-11/16"

The case is similar to a small Pelican case, water resistant, and very rugged. If you get their flyer, the coupon is on p. 16. The price is reduced from $15 to $10.

Jack, W8TEE

Re: Apache Case on Sale

KE0GYC
 

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?

Re: Solder Paste Extruder

Ken KM4NFQ <km4nfq@...>
 


On Thu, Jan 25, 2018 at 10:39 PM, Arv Evans <arvid.evans@...> wrote:
Ken, KM4NFQ

That solder paste extruder is a great idea.  I have used these tubes of solder paste for
several years but always fought with expressing enough, but not too much, of the paste.

Tomorrow I will be in my workshop building one of your devices.  I really like the concept.

It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB. 

Arv  K7HKL
_._


Hello Arv, K7HKL,

If you build your own Solder Paste Extruder, please send a snapshot of it to me.
I'm sure yours will look orders of magnitude better than mine.

Here are the approximate dimensions of the prototype that I made (not to scale):


​I used a piece of scrap 1x pine, 0.75" thick.
The screw is 1/4-20 about 3.75" long, from the scrap box.
The hole for the nut was drilled, then filed out.
The slots that hole the finger tabs on the syringe are the width of the jig saw blade.
I put masking tape around that part to keep the syringe from twisting / falling out.



My dental hygienist saves broken dental tools for me. They come in handy.

Regards,
Ken, KM4NFQ "Not Fully Qualified"



Re: Apache Case on Sale

daniel.fay@...
 

I'm planning to use the "big" version of the case (the 3800) to also hold things like accessories, battery pack, etc. for my uBitX.

I'm considering putting the LCD on a ribbon cable as well. From my personal experience with other low-speed, single-ended signals, you're probably fine for at least 15cm/6".

-Dan Fay

Re: Apache Case on Sale

Jack, W8TEE
 

I think there are a number of people who have moved the display away from the main board to give them some flexibility in terms of display placement. Evidently, some shielding is needed, but I think I recall someone simply wrapping the cable in foil mitigated the problem. I'd like to hear from anyone who has moved the display and what their experience is.

Jack, W8TEE



From: KE0GYC <dragonfanatic90@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 AM
Subject: Re: [BITX20] Apache Case on Sale

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?



Virus-free. www.avast.com

Re: Solder Paste Extruder

Doug W
 

On Thu, Jan 25, 2018 at 07:40 pm, Arv Evans wrote:
It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB

Here is one guy's attempt at exactly that  https://www.youtube.com/watch?v=tgXtRDVvhdU  seems the next evolution would be to fit a vacuum pump and home brew a pick and place rig.

Re: SMD Group Build

Michael Monteith
 

For myself I was thinking about getting one of these.   If nothing else great for close inspection of solder joints etc.

New Mega Pixels 1000X 8 LED USB Digital Microscope

73, Michael
KM4OLT

Re: Solder Paste Extruder

Jim Sheldon
 

Gm Jack,
You are not using BCC, your are using just CC and I'm still getting everything on the list including everyone's email addresses.  I'm still getting all the replies from the other people too.

Please, Please just remove me completely from this.  I'm getting too many emails to have to keep deleting them.  Sometimes I spend more time having to delete this stuff that I get done working on what I need to.

Sorry, but this has GOT to stop!

Jim - W0EB

------ Original Message ------
From: "Doug W" <dougwilner@...>
Sent: 1/26/2018 9:04:04 AM
Subject: Re: [BITX20] Solder Paste Extruder

On Thu, Jan 25, 2018 at 07:40 pm, Arv Evans wrote:
It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB

Here is one guy's attempt at exactly that  https://www.youtube.com/watch?v=tgXtRDVvhdU  seems the next evolution would be to fit a vacuum pump and home brew a pick and place rig.

Re: Solder Paste Extruder

Jim Sheldon
 

 OOPS mail client picked the wrong reply addressee - sorry!

------ Original Message ------
From: "Jim Sheldon" <w0eb@...>
Sent: 1/26/2018 9:12:11 AM
Subject: Re[2]: [BITX20] Solder Paste Extruder

Gm Jack,
You are not using BCC, your are using just CC and I'm still getting everything on the list including everyone's email addresses.  I'm still getting all the replies from the other people too.

Please, Please just remove me completely from this.  I'm getting too many emails to have to keep deleting them.  Sometimes I spend more time having to delete this stuff that I get done working on what I need to.

Sorry, but this has GOT to stop!

Jim - W0EB

------ Original Message ------
From: "Doug W" <dougwilner@...>
Sent: 1/26/2018 9:04:04 AM
Subject: Re: [BITX20] Solder Paste Extruder

On Thu, Jan 25, 2018 at 07:40 pm, Arv Evans wrote:
It seems possible that the solder paste extruder could also be adapted to a CNC Mill
or a 3D printer and used with appropriate G-Code to place small solder paste dots
for oven-baking of components to the PCB

Here is one guy's attempt at exactly that  https://www.youtube.com/watch?v=tgXtRDVvhdU  seems the next evolution would be to fit a vacuum pump and home brew a pick and place rig.

Re: Second batch of uBITX shipping? #ubitx

Kevin Luxford
 

I have purchased a number of products from hfsignals and from Sunil (amateurradiokits.in), and apart from the BITX40 from hfsignals which was transported in quick time by DHL couriers, I have relied on India Post. My experience has been that I get an email telling me that the item has been dispatched and quoting a tracking number. Searches on the number yield at most three entries, the last indicating that the parcel is about to leave India. Then a complete lack of further tracking data until the postie knocks on my front door with my parcel in his hand. The tactic employed here is to have a number of projects in the pipeline, so that a longer than expected delivery time does not cause too much angst. And down here, delays can occur in our Customs service, especially at this time of year - let alone the possibility that the authorities are being extra careful given the recent huge amounts of illegal drugs that have been intercepted.
Vy 73
Kevin VK3DAP / ZL2DAP


--
Kevin B. G. Luxford
kbgluxford@...

Re: Apache Case on Sale

Michael Hagen
 

Just use an I2C adapter, then it is 4 wires.  I have a 4 line x 20 on uBit doing that.

I did not shield them, but they could be twisted and shielded and run them away from the Radio PCB?

You can buy the adapter for about $3.


73's Mike, WA6ISP


On 1/26/2018 6:43 AM, Jack Purdum via Groups.Io wrote:
I think there are a number of people who have moved the display away from the main board to give them some flexibility in terms of display placement. Evidently, some shielding is needed, but I think I recall someone simply wrapping the cable in foil mitigated the problem. I'd like to hear from anyone who has moved the display and what their experience is.

Jack, W8TEE



From: KE0GYC <dragonfanatic90@...>
To: BITX20@groups.io
Sent: Friday, January 26, 2018 9:24 AM
Subject: Re: [BITX20] Apache Case on Sale

I love the idea of a "portable field radio" with all the controls on the top in a watertight case like this.  I'm thinking of modeling it after a bitX40 build I saw here, and this case looks like the perfect size!

Is there any reason I couldn't do that with the uBitx?  It looks like the LCD plugs directly into the board, but would it give me noise issues if I used a short length of ribbon cable to move the LCD to face upwards?



Virus-free. www.avast.com

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Apache Case on Sale

Vince Vielhaber
 

Thanks! I missed that one. It's good till 3/31 with a limit of 3 too!

Vince.

On 01/26/2018 09:01 AM, Jack Purdum via Groups.Io wrote:
All:

Harbor Freight has their small Apache chase on sale for the month of
February. */Inside/ *dimensions are:

Length: 8-3/8"
Height: 3-3/4"
Width: 5-11/16"

The case is similar to a small Pelican case, water resistant, and very
rugged. If you get their flyer, the coupon is on p. 16. The price is
reduced from $15 to $10.

Jack, W8TEE

Re: SMD Group Build

Michael Hagen
 

I got a USB microscope a few years back, it looks a little different than that.  eBay about $25?

AND, yes, it works great for that.  And you can snap pictures.  I used it to investigate a failure on a product a friend manufactures.   The software seems to be universal.  I changed computers, did a search, and got it running again.

I noticed now they have them with built on displays too, for more bucks? 

Mine is all metal looking with a base plate like a drill press sort of?  You get rough focus with the distance, then there is a threaded adjuster for fine.

I am real happy with it.

73's

Mike, WA6ISP


On 1/26/2018 7:07 AM, Michael Monteith via Groups.Io wrote:
For myself I was thinking about getting one of these.   If nothing else great for close inspection of solder joints etc.

New Mega Pixels 1000X 8 LED USB Digital Microscope

73, Michael
KM4OLT

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Second batch of uBITX shipping? #ubitx

Joel Fournol
 

j'ai commandé le mien le 15 décembre et toujours rien reçu pas d"avis ni de numéro de suivi ,seulement un post de HF Signals de patientez??

Re: Something has been blown

Arv Evans
 

César EA3IAV

I would not worry too much about using Ebay sourced IRF510s.  Apparently
International Rectifier no longer makes the IRF5xx line of devices but has
licensed Samsung and others to manufacture them.  Many of these licensed
units then become available through Ebay vendors.  In modern solid state
manufacturing most all devices are tested with software controlled test
setups so possibility of a bad device reaching the marketplace is much less
than was the case in past years. 

It is possible that only one of your MOSFETs is bad.  This could explain the
ability to adjust current and current flow when the PTT is activated.

A power supply that has current limiting might be a good way to power your
BITX.  Something around 3 amps should be adequate to keep from frying the
MOSFETs and still be adequate for normal operation.

Strong near-field reception is normal as long as there is some signal being
generated.  Leakage through power cables and control wiring is locally 
quite strong, even if the finals are not working.  If only one IRF510 is working
and you are adjusting the bias as if two were working it could be that you are
running that one device in a relatively linear mode due to higher than normal
current.  This could also explain strong signals on a local receiver. 

Arv  K7HKL
_._










On Fri, Jan 26, 2018 at 12:31 AM, César EA3IAV <Cesarleon@...> wrote:
Hi follks for the the ideas!
Antenna was matched with less than 1.4 swr
transistors were isolated and tested.

The only thing I can think of is that maybe, before considering to have the fets atached to the box I may shorted them by accident while initial testing

One doubt: even if they are blown, why i can transmit and be received in a nearby receiver? is it possible?
why it drains power if they are blown?

maybe it is just ine of them blown?

this afternont I will inspect tracks. I have some spare irf510 from ebay, but i was trying not to swap them because I don’t know if they are legit and the checking scenario could go very crazy with errrstuc fets...


Re: Apache Case on Sale

John P
 

Here's a link! This if the January flyer, so it doesn't show the sale price.
--
John - WA2FZW

Re: SMD Group Build

Michael Hagen
 

Good USB Microcsope

https://www.ebay.com/itm/Andonstar-500X-2MP-USB-Digital-Microscope-Video-webcam-Magnifier-Camera-Stand/371767002110?epid=1795612812&hash=item568f0a43fe:g:iGEAAOSw9~5ZS5DJ


On 1/26/2018 7:33 AM, Michael Hagen wrote:

I got a USB microscope a few years back, it looks a little different than that.  eBay about $25?

AND, yes, it works great for that.  And you can snap pictures.  I used it to investigate a failure on a product a friend manufactures.   The software seems to be universal.  I changed computers, did a search, and got it running again.

I noticed now they have them with built on displays too, for more bucks? 

Mine is all metal looking with a base plate like a drill press sort of?  You get rough focus with the distance, then there is a threaded adjuster for fine.

I am real happy with it.

73's

Mike, WA6ISP


On 1/26/2018 7:07 AM, Michael Monteith via Groups.Io wrote:
For myself I was thinking about getting one of these.   If nothing else great for close inspection of solder joints etc.

New Mega Pixels 1000X 8 LED USB Digital Microscope

73, Michael
KM4OLT

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...