Date   
Re: Multi band Radiuno V2.0xz

Allard PE1NWL
 

Band (filter) switching would require some IO pins to drive relays.
Unfortunately there's only one free IO pin left: pin A2 (previously used
for calibration).
With just one IO pin we could only switch between two bands.

73 Allard PE1NWL

On Thu, January 25, 2018 15:11, Steve wrote:
I'm using V2.03 on my bitx40 with great results. With all the nice
features, I was thinking about adding an extra band or two or even more to
the rig. 

Would it be feasible to add multi band options to the Raduino 2 software?
It would keep the same IF shift etc but have extra controls for band up /
down and to switch in the different BPFs / LPFs? It would also need to
reverse the BFO side for USB / LSB for bands above the IF I guess. 

Any my advice would greatly appreciated!

Many thanks,

Steve MW0KST

Re: SMD Group Build

Jack Purdum
 

Mornin' Ken:

You're right, and I may have glossed over this idea too quickly. This might be a great way to get them to try at low expense and without insulting their fabrication abilities. I do have everything you suggested except the skillet. That might be the club's next project after the frequency counter.

Jack, W8TEE



From: Ken KM4NFQ <km4nfq@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 6:24 AM
Subject: Re: [BITX20] SMD Group Build

Hello Jack, W8TEE,

The SMD components are not the only thing that you might need.
Also look into:
Solder paste in a syringe with application needles (~ $20+ for 35gm)
Toaster Oven or Electric Skillet for melting the solder onto the PCB (find in a thrift store)
Tweezers (for manually placing the components)
Hot Air Gun (for removing parts)
Magnifying Loupe (for inspecting your work)
Desoldering wick (removing solder bridges from ICs)
Soldering Iron with fine tip (rework tombstoned parts)

The revolving LED kit is a challenge to build for beginners.
$3 - $4 per person in the group. All the components are in the kit.
The circuit itself is in the middle of the PCB.
But there are three columns of practice components on each side.
1206, 0805, 0805, 0603, 0603, and 0402 sizes are included, so you get an idea.
The practice columns are not connected to the revolving LED circuit.
The revolving LED circuit has a 555 and a CMOS 4017, as well as
transistors, diodes, and LEDs, so you get a variety of SMDs to work with.

In my recent and limited experience, making an SMD project consists of:
Identifying the components.
Applying solder paste evenly to the pads.
Placing the SMD components on the solder paste.
All the components are soldered at once.
Clean the flux from around the components (Isopropyl Alcohol & toothbrush)
Smoke test.
Only part of my circuit worked, but I got some SMD soldering practice for $3 - $4.

Regards,
Ken, KM4NFQ






On Wed, Jan 24, 2018 at 8:27 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
All:

We have a small group of local hams who enjoy building stuff, yet most are scared to death of SMD parts. Our last build had 29 do the build which is about half of our group. What I'd like to do is put together a small SMD project and have 30 or so boards made. (I have no idea what a good starter project would be.) If anyone has done this, are the board costs less than thru-holes boards? Also, are Mouser and Digikey the likely source for large (e.g., 1206) parts or do you know of a better source.

Thanks!

Jack, W8TEE



Re: SMD Group Build

Jerry Gaffke
 

That blinky light board looks good as a first intro.
Let them know it is possible to find kits with just 1206's and SOIC's like the 555.
Use a good hot fine tipped soldering iron and appropriately thin solder.

I can hand solder parts with 0.02" pin spacing like the si5351, but it's a chore.
Generally wind up using copious amounts of solder wick and liquid flux
to clean up the solder bridges.  There are many types of flux, I use some
fairly corrosive water soluble stuff and then wash the boards thoroughly.
Flux hiding under parts can be trouble, especially with high impedance nodes.

If laying out a PC board for hand soldering, make the pads long enough that you
can touch the pad with a soldering iron.
Many footprint libraries assume you are auto-inserting the parts onto solderpaste.

If you want to move up to solder paste and embossing guns, here's a good resource:
    :http://kd5ssj.com/solderpaste/smt-tools-and-process
With a moderately large board you may need to go with the toaster oven to get the 
whole board hot.  

To remove parts without destroying them, invest in some ChipQuik.
It's a low temperature solder alloy that you add to the pads of the offending part,
then easily remove with the embossing gun. 

Could bring a DSBGA like this   http://www.ti.com/lit/ds/symlink/tas2560.pdf
and some 0201 chip resistors to class, just in case they're getting bored.

Jerry


On Thu, Jan 25, 2018 at 03:24 am, Ken KM4NFQ wrote:
The SMD components are not the only thing that you might need.
Also look into:
Solder paste in a syringe with application needles (~ $20+ for 35gm)
Toaster Oven or Electric Skillet for melting the solder onto the PCB (find in a thrift store)
Tweezers (for manually placing the components)
Hot Air Gun (for removing parts)
Magnifying Loupe (for inspecting your work)
Desoldering wick (removing solder bridges from ICs)
Soldering Iron with fine tip (rework tombstoned parts)

Re: SMD Group Build

Michael Hagen
 

Placing down the solder mask has been a big problem for me.

My stuff (Mechanics Brand - Lo Tempt) from eBay is in a small jar.  I keep it in the refrig, it nasty stringy.

I have tried a sewing needle to dispense.  Then I move it around with the tip of an exacto knife.  And mostly get rid of all but a tiny amount.  It comes out in blobs and does not stick down, seems to just stick together while trying to drag it.

I may have bought already too old stuff on eBay, it was about $12 for 50 grams.  I use a heat gun, bought an oven but

have not tried it yet.

So is the stuff in the syringe come out nice in small amounts?  Do you wait for it to become room temperature to use?

I may try to "Thin" some with liquid flux.

I may have to learn more about getting solder masks?

Thanks for any info on this frustrating ordeal.

73's Mike, WA6ISP



On 1/25/2018 6:57 AM, Jack Purdum via Groups.Io wrote:
Mornin' Ken:

You're right, and I may have glossed over this idea too quickly. This might be a great way to get them to try at low expense and without insulting their fabrication abilities. I do have everything you suggested except the skillet. That might be the club's next project after the frequency counter.

Jack, W8TEE



From: Ken KM4NFQ <km4nfq@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 6:24 AM
Subject: Re: [BITX20] SMD Group Build

Hello Jack, W8TEE,

The SMD components are not the only thing that you might need.
Also look into:
Solder paste in a syringe with application needles (~ $20+ for 35gm)
Toaster Oven or Electric Skillet for melting the solder onto the PCB (find in a thrift store)
Tweezers (for manually placing the components)
Hot Air Gun (for removing parts)
Magnifying Loupe (for inspecting your work)
Desoldering wick (removing solder bridges from ICs)
Soldering Iron with fine tip (rework tombstoned parts)

The revolving LED kit is a challenge to build for beginners.
$3 - $4 per person in the group. All the components are in the kit.
The circuit itself is in the middle of the PCB.
But there are three columns of practice components on each side.
1206, 0805, 0805, 0603, 0603, and 0402 sizes are included, so you get an idea.
The practice columns are not connected to the revolving LED circuit.
The revolving LED circuit has a 555 and a CMOS 4017, as well as
transistors, diodes, and LEDs, so you get a variety of SMDs to work with.

In my recent and limited experience, making an SMD project consists of:
Identifying the components.
Applying solder paste evenly to the pads.
Placing the SMD components on the solder paste.
All the components are soldered at once.
Clean the flux from around the components (Isopropyl Alcohol & toothbrush)
Smoke test.
Only part of my circuit worked, but I got some SMD soldering practice for $3 - $4.

Regards,
Ken, KM4NFQ






On Wed, Jan 24, 2018 at 8:27 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
All:

We have a small group of local hams who enjoy building stuff, yet most are scared to death of SMD parts. Our last build had 29 do the build which is about half of our group. What I'd like to do is put together a small SMD project and have 30 or so boards made. (I have no idea what a good starter project would be.) If anyone has done this, are the board costs less than thru-holes boards? Also, are Mouser and Digikey the likely source for large (e.g., 1206) parts or do you know of a better source.

Thanks!

Jack, W8TEE




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

Re: SMD Group Build

Michael Hagen
 

This is what is recommended.


https://www.cmlsupply.com/kester-ep256-lead-solder-paste-63-37-syringe-dispenser/



On 1/25/2018 7:52 AM, Michael Hagen wrote:

Placing down the solder mask has been a big problem for me.

My stuff (Mechanics Brand - Lo Tempt) from eBay is in a small jar.  I keep it in the refrig, it nasty stringy.

I have tried a sewing needle to dispense.  Then I move it around with the tip of an exacto knife.  And mostly get rid of all but a tiny amount.  It comes out in blobs and does not stick down, seems to just stick together while trying to drag it.

I may have bought already too old stuff on eBay, it was about $12 for 50 grams.  I use a heat gun, bought an oven but

have not tried it yet.

So is the stuff in the syringe come out nice in small amounts?  Do you wait for it to become room temperature to use?

I may try to "Thin" some with liquid flux.

I may have to learn more about getting solder masks?

Thanks for any info on this frustrating ordeal.

73's Mike, WA6ISP



On 1/25/2018 6:57 AM, Jack Purdum via Groups.Io wrote:
Mornin' Ken:

You're right, and I may have glossed over this idea too quickly. This might be a great way to get them to try at low expense and without insulting their fabrication abilities. I do have everything you suggested except the skillet. That might be the club's next project after the frequency counter.

Jack, W8TEE



From: Ken KM4NFQ <km4nfq@...>
To: BITX20@groups.io
Sent: Thursday, January 25, 2018 6:24 AM
Subject: Re: [BITX20] SMD Group Build

Hello Jack, W8TEE,

The SMD components are not the only thing that you might need.
Also look into:
Solder paste in a syringe with application needles (~ $20+ for 35gm)
Toaster Oven or Electric Skillet for melting the solder onto the PCB (find in a thrift store)
Tweezers (for manually placing the components)
Hot Air Gun (for removing parts)
Magnifying Loupe (for inspecting your work)
Desoldering wick (removing solder bridges from ICs)
Soldering Iron with fine tip (rework tombstoned parts)

The revolving LED kit is a challenge to build for beginners.
$3 - $4 per person in the group. All the components are in the kit.
The circuit itself is in the middle of the PCB.
But there are three columns of practice components on each side.
1206, 0805, 0805, 0603, 0603, and 0402 sizes are included, so you get an idea.
The practice columns are not connected to the revolving LED circuit.
The revolving LED circuit has a 555 and a CMOS 4017, as well as
transistors, diodes, and LEDs, so you get a variety of SMDs to work with.

In my recent and limited experience, making an SMD project consists of:
Identifying the components.
Applying solder paste evenly to the pads.
Placing the SMD components on the solder paste.
All the components are soldered at once.
Clean the flux from around the components (Isopropyl Alcohol & toothbrush)
Smoke test.
Only part of my circuit worked, but I got some SMD soldering practice for $3 - $4.

Regards,
Ken, KM4NFQ






On Wed, Jan 24, 2018 at 8:27 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
All:

We have a small group of local hams who enjoy building stuff, yet most are scared to death of SMD parts. Our last build had 29 do the build which is about half of our group. What I'd like to do is put together a small SMD project and have 30 or so boards made. (I have no idea what a good starter project would be.) If anyone has done this, are the board costs less than thru-holes boards? Also, are Mouser and Digikey the likely source for large (e.g., 1206) parts or do you know of a better source.

Thanks!

Jack, W8TEE




-- 
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@...

Re: Creating Gerber files for pcb construction

Gordon Gibby
 

Added a 1-transistor amplifier (12volt wall wart supply) to increase my square wave input to the bridge swr measurement.  Aimed for couple of volts rms.   2n3904, schematic to follow.    Turns out there are lots of "swr bridges" out there....and exactly how you assemble the components for the reflected/forward measurements DOES make a difference (as I proved over the last 24 hours).   I used available components,, not the greatest technique, and some shottky small signal diodes, somewhat following fig 5 from here : https://www.qrz.ru/schemes/contribute/arrl/chap27.pdf

 


And got fairly reasonable measurements with two digital voltmeters (safer than connecting to the arduino at first!!!   SWR calculated by  formula  (forward+reflected)/(forward-reflected)


Voltages in millivolts, SWR in ratios. 


NEW CIRCUIT
Zero ohms


25 ohms


50 ohms


100 ohms


220 ohms


Open Circuit

expected swr:

large


2


1


2


4.4


large
3.5MHz 625 420 5.1
763 130 1.4
861 1 1.0
983 296 1.9
1121 720 4.6
1377 1542 -17.7
9.6 MHz 362 184 3.1
427 51
1.3
480 2 1.0
540 130 1.6
611 355 3.8
780 924 -11.8
18.8 MHz 155 101 4.7
169 25 1.3
193 5 1.1
225 50 1.6
255 168 4.9
349 449 -8.0
35.7 MHz
35 36 -71.0
28
10 2.1
33 3 1.2
38 6 1.4
46 27 3.8
72 118 -4.1


Looks reasonably usable.   Of course, this is a square wave input and not a pure frequency, but with the fall off in signal amplitude, likely the majority of the signal is fundamental.   


If you reverse the diode and capacitor in that fig 5 circuit for reflected, you'll end up with higher swrs on lower impedances and lower swrs on higher impedances.....been there, done that. 


next step will be to connect to Arduino circuitry / op amp....maybe later....



From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby <ggibby@...>
Sent: Thursday, January 25, 2018 4:53 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Creating Gerber files for pcb construction
 
William Maxwell—Aha!!  Thanks, now I understand.   73, 


Sent from my iPhone

On Jan 24, 2018, at 23:41, William R Maxwell <wrmaxwell@...> wrote:

If you play around with the quantity on the on-line quotation screen on the website of just about any othe Chinese manufacturers, you will see that 10 boards usually cost exactly the same total as any lesser quantity, provided the size is within the specified maximum for their current special offer, usually a maximum of 100mm x 100mm. Hence my hint of a week or so back to order 10.

Bill VK7MX

On 25/01/2018 10:57 AM, Gordon Gibby wrote:
First set of boards arrived today -- not sure why they shipped me TEN boards, I only ordered five.

This is all new to me.   Soldered in header sockets.   Wished I'da thought of that for ALL the i/o connections.



Found at least one error so far -- forgot to ground pin 5 of the LCD display.   Have not soldered in the op amp portion but got the LCD working (after adding little ground wire) and verified that the Adafruit Si5351 is bring controlled --- communications receiver hears  it right where I send its frequency to.   



This so SO cool.....   



Can't believe how much this forum has taught me in just a few weeks.

This is going to be huge for our local ARES group.   Loads of skills they can learn.



Gordon



________________________________________

From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby <ggibby@...>

Sent: Tuesday, January 23, 2018 4:35 PM

To: BITX20@groups.io

Subject: Re: [BITX20] Creating Gerber files for pcb construction



I don't have the exact number, but one company was about $24 (including shipping) and the other company was $28 (including shipping) --- 5 boards each company.   First time customer.



________________________________________

From: BITX20@groups.io <BITX20@groups.io> on behalf of B C <k9wis@...>

Sent: Tuesday, January 23, 2018 4:19 PM

To: BITX20@groups.io

Subject: Re: [BITX20] Creating Gerber files for pcb construction



what did those boards cost you??

Brian K9WIS



---- Gordon Gibby <ggibby@...> wrote:

​Thanks to all your suggestions I made two trial orders:



pcbway.com



jlcpcb.com





About last friday night/saturday.



The first set is supposed to arrive sometime tomorrow (wednesday)



and the other set on Thursday.   amazing.





Fingers crossed that I did this correctly!!!





Showed this project to my youngest son (working as a new auto mechanic) and he was motivated to get out the christmas arduino kit I gave him and immediately started building LED circuits....astonishing my wife and me....may help him out in life.









________________________________

From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby <ggibby@...>

Sent: Sunday, January 21, 2018 12:09 AM

To: BITX20@groups.io

Subject: Re: [BITX20] Creating Gerber files for pcb construction





Thanks for yet another great suggestion.





I have now created a "flying jumpers" breadboard version using a couple of different resistive bridge designs --- the K6BEZ design driven by the Si5351 directly  didn't produce enough voltage to make the reverse measurement accurate and I gave up after several hours on that.   Would need to add an amplification stage I believe...   The easy swr indicator kit from https://urldefense.proofpoint.com/v2/url?u=http-3A__www.qrpkits.com_ezseries.html-23ezswr&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=wATr3kl2cd5RzPMIGfxbDzykiABvusgbH-fnLXPAkSA&e=<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.qrpkits.com_ezseries.html-23ezswr&d=DwMFAw&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=McWMTsaWY88BIHjI9RhDX8BXq0BroHl6MaH6P7zGTVo&s=iOg3ff6bkbrqV9BQbMsupWJHkEUhFqFcHTVOepLM0YM&e=>  (no LED, just take the rectified voltage and run into an op amp with a gain of about 6)  produced a voltage that seemed to work.   My circuit is sorta haywire (with egloo jumpers everywhere) and the pcb version would be FAR MORE STABLE but I'm able to measure  shorts, 25 ohm, 50 ohm, 100 ohm, 220 ohm and open circuit and get  "sorta close SWR" measurements at frequencies up to maybe 30 MHz.   There is so much haywiredness to the breadboard that I can't make any better observations at the moment.   The PCB should be a ton more mechanically stable.  Earlier today I put it on a real antenna and it did find the resonance.





A friend is working on the "single meter" SWR version using a toroidial swr measurement head (which I also have built and should also work).   The goal there is to emulate the $129 LDG big meter display of SWR.....    The pcb that I cranked out (and now being built in China, fingers crossed!) should work with both.   (2 different inputs).





You folks are a lot brighter at this stuff than I am but it has been a ton of fun just getting this much to work!  I think this is going to be a great building project for our ARES group.













________________________________

From: BITX20@groups.io <BITX20@groups.io> on behalf of William R Maxwell <wrmaxwell@...>

Sent: Saturday, January 20, 2018 5:02 PM

To: BITX20@groups.io

Subject: Re: [BITX20] Creating Gerber files for pcb construction





Another to consider is www.jlcpcb.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.jlcpcb.com&d=DwMF-g&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=IdE0tYxjCfc0L_NPXEC5rll-igwhgt6ppqTzraUYlNc&s=WtrSAHHYrh1yu_YDRixyHaUjQzv0a3Hp9-zY2b8fanM&e=>. I have just received 10 boards for a mere $2 total, including DHL shipping.  Note the there is a sixe limit of 100mmx100mm, and two layers, green solder resist and 1.6mm material.



This offer I think is limited to your initial order. A subsequent set of 3 boards, 10 copies each, cost me $29, including shipping.



Bill, VK7MX



On 21/01/2018 12:38 AM, Gordon Gibby wrote:

Wow!!! Thank you for that wonderful tip.



Sent from my iPhone



On Jan 20, 2018, at 06:51, Kerr Smith <kerrsmithusa@...<mailto:kerrsmithusa@...>> wrote:



Have you looked at PCB Shopper? You just set the size of your PCB and how any boards you require and it will list all the main PCB fabrication sites and how much it will cost:



https://urldefense.proofpoint.com/v2/url?u=https-3A__pcbshopper.com&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=0xNqpq13ii9aT1Sh5iz_prDuqOsArD7fo-GvxVduS2A&e=<https://urldefense.proofpoint.com/v2/url?u=https-3A__pcbshopper.com&d=DwMFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=tVwyxBAPRZNQpdExa-g1tsq8okRaE7YCQUjWUUW6hMg&s=x1CZZZOSFNIXEjRrVRTlehkNhcaChUif1k7nsMKwx4Q&e=>



For my latest PCBs I tried AllPCB and was extremely pleased with the results, they had an offer on at the time so for $5 I got 7 boards on one order and for my second $5 order I got 17 boards (if your boards are small they seem to add in extra to your order) - they were all shipped using TNT and arrived in just 5 days. At the current time the total cost is $12 for 5 boards up to 35mm x 35mm with free TNT shipping:



https://urldefense.proofpoint.com/v2/url?u=http-3A__www.allpcb.com&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=XnTdlYHqFlKmjNeCLrFl6eNp9UdCG5Xzx2kDDYXCyOg&e=<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.allpcb.com_setinvite.aspx-3Finviteid-3D30276-26url-3Dhttp-3A__www.allpcb.com_online-5Fquote.html&d=DwMFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=tVwyxBAPRZNQpdExa-g1tsq8okRaE7YCQUjWUUW6hMg&s=VRALDmdsziyoxueeKz6mXPEvcc6DHC3hcVq_mlvqGIo&e=>



The other site I would recommend is OSHPark:



https://urldefense.proofpoint.com/v2/url?u=https-3A__oshpark.com&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=z3OHoUEftZQXgilq__PmOkVk9mUQmTqOuH12jAGHT0c&e=<https://urldefense.proofpoint.com/v2/url?u=https-3A__oshpark.com_&d=DwMFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=tVwyxBAPRZNQpdExa-g1tsq8okRaE7YCQUjWUUW6hMg&s=dqHZt9-lgSwySoNuMqvHedfU_5GT-Uu8usvQgbFEknc&e=>



They are the ones who do the purple PCBs which look really great and also pretty cheap, only a few dollars (around $9.50) for three 35mm x 35mm boards with shipping included.



I am so pleased that the price for creating PCBs yourself is now this low, up until now I have been carefully making my own by etching them but now I can get them in a few days if I need them fast or a couple of weeks if I don't mind waiting. There are so many different fabrication sites there is always going to be a great deal to be had if you shop around a bit, the PCB Shopper site I mentioned above is really great for this.























Re: uBitx TX performance with frequency

Henning Weddig
 

All,

I guess that there are two design mistakes:

1. the supply voltage to the drains of the transistors is fed via individual chokes, not the "balancing" dual winding choke

2. the input cpacitance of the FET´s do a big harm

Please have a look on the often cited WA2EBY amp: he uses the choke (T2) on the output and in addition he is using inductances from the gate (L1, L2) to the bias feeding resistor (27 ohms). To my understanding the inductor forms a parallel resonator with the input capacitance of the FET thereby flattening the frequency response.

In Part 2 of Mike Krossors article (fig 4) the "bad" frequency response of "normal" IRF510 amps is clearly shown, so it seems that L1 and L2 togehter wit the series inductance of the input balun are upgrading the performance.

Please have alook on the Philips (NXP) app note NCO8701. In this app note they are also using inductors in the input and even from the drain to the balun on the output. Design formulas are also given there.

I am not sure if the drivers are "good" enough for driving the high capacitive input of the IRF510.

I recently read an article (EDN) about the 2N2219 als vidoe amps, they do not perform very well, althoug I remember that this transistor (two in parallel) was used in a 2 m AM transmitter (german company Semcoset, MBS22?, about 1969, the year I got my ham radio license). A 2N3866 is preferred even for video amps in the 50 MHz range!

What about a BFG135 or similar for the driver? Or: RD00HS ????

I am urgently waiting on my µBITX ordered on Dec 24 2017.

Henning Weddig

DK5LV


Am 25.01.2018 um 09:01 schrieb Lawrence Galea:

Farhan
I know it will increase the price, but how about switching over to the RD16HVF1 which would allow the rig to run from 12V doing away with those wanting more power to increase the voltage to the PA?
Would also do away with the PA heatsinks if the case is metal and it is used as the heatsink.
Regards
Lawrence

On Thu, Jan 25, 2018 at 6:23 AM, Ashhar Farhan <farhanbox@...> wrote:
You can increase drive with the preset of the predriver.
- f

On 24 Jan 2018 6:24 pm, "KD8CGH" <rkayakr@...> wrote:
I took some time to measure the actual performance of my uBitx with its original calibration against a dummy load. The instruments used are not lab calibrated. I did check my wattmeter against my recently factory calibrated K3 and found the power reported to be about 5% high. The power supply is rated as 25 amps and set at 13.7 volts. I tested by simply pressing the PTT (no audio input, power out 0) and keying CW.
Receive current: .25 A

  PTT CW CW
f kHz I amp I amp P watt
3,530 0.74 1.8 8
3,970 0.74 2.1 9
7,030 0.73 1.57 5
7,270 0.7 1.6 5
10,113 0.72 1.22 3
14,030 0.71 1.34 3
14,320 0.71 1.37 3
21,170 0.69 0.96 1
28,900 0.69 0.83 0.5

The results agreed in general with Dave's (WI6R) post https://groups.io/g/BITX20/message/39578, although his results start a bit higher and end even lower.
Although my current draw with PTT down agrees with the value specified on the Tune-up page, I never quite see 10 watts out. The 80 meter power isn't too bad, but the 14 MHz is half and 28 MHz is 1/4 of that mentioned on the uBitx web page.

What TX performance have others seen?
Any fixes for higher frequencies?

     Bob   KD8CGH


Re: Can uBITX be modified for AM Phone operation?

twowindsbear@...
 

Hi

Since you're interested in AM radios that glow in the dark, have you looked at the Pine Board Project 75m AM radio?  You can get more details here:

https://heilsound.com/amateur-radio-post/the-pine-board-project/

Good luck.

73
Dan 
WD4IRK

The case of Two Raduinos

q q
 






:
I have two Raduinos here, one that came with my uBitx and is working 100% with supplied firmware the other is one that was for my Bitx40 that I modified to use with the uBitx.

I loaded it with the stock uBitx software and it works ok but it makes the radio sound "Tinny".  I tried another version of software and it still sounds the same.

Am I doing something wrong here with proper loading of software or is there a component issue?  Anyone else seen this?

Thanks
Bob
N1ETS

Re: uBitx TX performance with frequency

Rod Davis
 

Henning and all,

I am not sure the individual-chokes-method is a mistake: my understanding is that technique results in a substantial improvement in IMD.

Remember, every design decision is a tradeoff.

Rod KM6SN


On 01/25/2018 09:02 AM, Henning Weddig via Groups.Io wrote:

All,

I guess that there are two design mistakes:

1. the supply voltage to the drains of the transistors is fed via individual chokes, not the "balancing" dual winding choke

2. the input cpacitance of the FET´s do a big harm

Please have a look on the often cited WA2EBY amp: he uses the choke (T2) on the output and in addition he is using inductances from the gate (L1, L2) to the bias feeding resistor (27 ohms). To my understanding the inductor forms a parallel resonator with the input capacitance of the FET thereby flattening the frequency response.

In Part 2 of Mike Krossors article (fig 4) the "bad" frequency response of "normal" IRF510 amps is clearly shown, so it seems that L1 and L2 togehter wit the series inductance of the input balun are upgrading the performance.

Please have alook on the Philips (NXP) app note NCO8701. In this app note they are also using inductors in the input and even from the drain to the balun on the output. Design formulas are also given there.

I am not sure if the drivers are "good" enough for driving the high capacitive input of the IRF510.

I recently read an article (EDN) about the 2N2219 als vidoe amps, they do not perform very well, althoug I remember that this transistor (two in parallel) was used in a 2 m AM transmitter (german company Semcoset, MBS22?, about 1969, the year I got my ham radio license). A 2N3866 is preferred even for video amps in the 50 MHz range!

What about a BFG135 or similar for the driver? Or: RD00HS ????

I am urgently waiting on my µBITX ordered on Dec 24 2017.

Henning Weddig

DK5LV


Am 25.01.2018 um 09:01 schrieb Lawrence Galea:
Farhan
I know it will increase the price, but how about switching over to the RD16HVF1 which would allow the rig to run from 12V doing away with those wanting more power to increase the voltage to the PA?
Would also do away with the PA heatsinks if the case is metal and it is used as the heatsink.
Regards
Lawrence

On Thu, Jan 25, 2018 at 6:23 AM, Ashhar Farhan <farhanbox@...> wrote:
You can increase drive with the preset of the predriver.
- f

On 24 Jan 2018 6:24 pm, "KD8CGH" <rkayakr@...> wrote:
I took some time to measure the actual performance of my uBitx with its original calibration against a dummy load. The instruments used are not lab calibrated. I did check my wattmeter against my recently factory calibrated K3 and found the power reported to be about 5% high. The power supply is rated as 25 amps and set at 13.7 volts. I tested by simply pressing the PTT (no audio input, power out 0) and keying CW.
Receive current: .25 A

  PTT CW CW
f kHz I amp I amp P watt
3,530 0.74 1.8 8
3,970 0.74 2.1 9
7,030 0.73 1.57 5
7,270 0.7 1.6 5
10,113 0.72 1.22 3
14,030 0.71 1.34 3
14,320 0.71 1.37 3
21,170 0.69 0.96 1
28,900 0.69 0.83 0.5

The results agreed in general with Dave's (WI6R) post https://groups.io/g/BITX20/message/39578, although his results start a bit higher and end even lower.
Although my current draw with PTT down agrees with the value specified on the Tune-up page, I never quite see 10 watts out. The 80 meter power isn't too bad, but the 14 MHz is half and 28 MHz is 1/4 of that mentioned on the uBitx web page.

What TX performance have others seen?
Any fixes for higher frequencies?

     Bob   KD8CGH



Re: Multi band Radiuno V2.0xz

bill richardson
 

Ok you could do what I did and use a band switch. You can order a multi poll bandswitch and do it manually for the bandpass filtering and use external low pass filter for say 80 and 160m.

Sent from my iPhone

On Jan 25, 2018, at 9:51 AM, Allard PE1NWL <@pe1nwl> wrote:

Band (filter) switching would require some IO pins to drive relays.
Unfortunately there's only one free IO pin left: pin A2 (previously used
for calibration).
With just one IO pin we could only switch between two bands.

73 Allard PE1NWL

On Thu, January 25, 2018 15:11, Steve wrote:
I'm using V2.03 on my bitx40 with great results. With all the nice
features, I was thinking about adding an extra band or two or even more to
the rig.

Would it be feasible to add multi band options to the Raduino 2 software?
It would keep the same IF shift etc but have extra controls for band up /
down and to switch in the different BPFs / LPFs? It would also need to
reverse the BFO side for USB / LSB for bands above the IF I guess.

Any my advice would greatly appreciated!

Many thanks,

Steve MW0KST


Re: The case of Two Raduinos

Jerry Gaffke
 

I'd guess it is a calibration issue, the BFO is at a different frequency on the different Raduinos,
either because the reference oscillator is different or (more likely) because the Raduino shipped with the uBitx
had a correct calibration value stored in EEPROM to compensate
.
Try moving the BFO around using the calibration routines. 
The frequency of the BFO relative to the passband of your crystal filter 
will determine how the audio sounds.

Jerry, KE7ER



On Thu, Jan 25, 2018 at 09:08 am, q q wrote:

have two Raduinos here, one that came with my uBitx and is working 100% with supplied firmware the other is one that was for my Bitx40 that I modified to use with the uBitx.

I loaded it with the stock uBitx software and it works ok but it makes the radio sound "Tinny".  I tried another version of software and it still sounds the same.

Am I doing something wrong here with proper loading of software or is there a component issue?  Anyone else seen this?

Re: Can uBITX be modified for AM Phone operation?

Arvo W0VRA
 

On Thu, Jan 25, 2018 at 09:03 am, <twowindsbear@...> wrote:
Since you're interested in AM radios that glow in the dark, have you looked at the Pine Board Project 75m AM radio?
Wow, that's really cool!

A tube based mic pre w/EQ even!

Re: The case of Two Raduinos

q q
 

I tried very tediously to Calibrate it.
Zero beat at 5 and 10MHz , various other bands too.

Re: Can uBITX be modified for AM Phone operation?

Dexter N Muir
 

In principle, TX is simple. Bypass the filter and feed the audio on top of DC (to unbalance the modulator). RX better by a small SW set: feed the converter from the IF and BFO (suitably offset ) and the audio back in to the vol. pot.

Re: Can uBITX be modified for AM Phone operation?

Dexter N Muir
 

... sorry, VFO  and BFO. 73 :)

Re: Oscilloscope for Beginners - A story

Robert D. Bowers
 

I remember the first digitizing scope I heard or read about - one made by Heathkit and sold many years ago (when they were still in business).  It had a 50mhz bandwidth and communicated by serial port.  I wanted one in the worst way... both for ham stuff and for my industrial electronics repair business (CNC/NC).  I never owned one (too expensive), but later acquired a 7000 series digitizer plug-in (with docs and spare for parts) to add to my good (analog) scope - sold as untested surplus and required repairs.  The digitizing stuff came in REALLY handy at times (I also owned a analog Tek 7900 series storage scope for several years - impressive bandwidth and it worked great, but big and heavy!)

I lost all of my equipment (plus radios, equipment, parts and manuals) in a fire, but since then lucked out and picked up a 500mhz digital and a 35mhz analog in recent years.  The thing is, if you have an idea of what you're going to 'look for' with the scope can guide you to the one you want to use - digitizing scopes can do things (like capture glitches) that are relatively difficult for analog scopes to get, but at the same time they have their limitations.  I'm not back to near what I was before the fire, but at least I can do some stuff...

Bob N4FBZ


On 01/25/2018 12:23 AM, Ashhar Farhan wrote:
There is a very strong connection of ham radio and tek. Many of our heros are alumni of tek. They invented many things. I found out they invented the tunnel diode, made their own devices, displays.
- f

On 24 Jan 2018 11:10 pm, "Michael Hagen" <motdog@...> wrote:

The Rigol I got had about 17 hrs. on the meter.  It still was running all the options they turn off after 30 Hrs.


Then they want you to pay!

At the time they were $299 new, I bid $260 on eBay.  What a deal, and you get 4 new probes!  No tax and just a little shipping.

There are tons of information out there on the DS1054Z.    Lots of reviews.  Only big complaints are too much on the screen and it is very small.  The encoders have small knobs, and you have to push just right or the encoder might move?  There is a hack out in the wild to change the options yourself, so you get 100 Mhz and special triggering functions, and deep memory.   You do it at your own risk.  You can find info on lots of sites.  I doubt if their newer models have this "feature"?

I just wish it was a little bigger.  I hope it stays working now that I am bragging about it!

I really hated my $65 PC connected scope mentioned to start this thread.  Hantek had NO support and no Firmware

updates.  I had to carry a big 600V 1uf cap to AC couple it.  The triggering options were very minimal.

Like you I really like Real Analog scopes, but their day is gone.

73's

Mike, WA6ISP

https://www.ebay.com/itm/Rigol-DS1054Z-Digital-Oscilloscopes-Bandwidth-50-Mhz-Channels-4/331941742120?epid=2254681137&hash=item4d49450628:g:EHYAAOSwUoNaA4By


On 1/24/2018 9:12 AM, Jerry Gaffke via Groups.Io wrote:
I've always had a soft spot for a good analog scope,
and John's post had me prowling around ebay some.
Anything moderately cheap is "parts only", refurbished you spend about
as much as you would for a new Rigol.

Unless you get a really good deal on one you know works,
I can't recommend an old used scope to the typical hobbyist.
Fixing those old scopes with all their custom parts can be non-trivial.

Jerry, KE7ER 


On Wed, Jan 24, 2018 at 08:24 am, Michael Hagen wrote:

So, I gave up, if it is not a simple fix, they seemed to consume all my time.

 


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

Re: Creating Gerber files for pcb construction

n5ib_2
 

I visited the EasyEDA site this morning and noticed they have changed the portal for submitting gerbers for fabrication. It now brings you to a JLCPCB page with a gerber viewer that is different from the previous one.

Previously I'd had some problems - the previous gerber viewer provided on the site did not properly display copper pours on the bottom layer, and did not recognize drawn circles or ellipses unless they were converted to polygons. Sufficiently confidence eroding to tread carefully.

This problem seems to have been corrected with this new portal.

I received a small order of boards from them yesterday.(checked with the old gerber viewer) Very simple layout but with all of the elements in place - top&bottom copper, masks, and silkscreens, with edited features in the mask, and V-cuts to separate individual boards. Fabrication was satisfactory in all respects. I was contacted with some questions and requests to verify that my somewhat "unusual" features were intentional and not errors. So it appears their checking is more than just perfunctory. I will probably send them another more complex and fine-featured layout soon.

Jim, N5IB

Re: Multi band Radiuno V2.0xz

DuWayne Schmidlkofer
 

You could us a 2 pole multi throw switch as a andswitch.  One pole switches in the appropriate relay for the LP/BP filter.  The other pole connects to A2 and each position on the switch connects to a point on a voltage divider from 5v to ground. Each time through the loop, look for a change in voltage.  If it changes use the map function to determine the band and switch the 
VFO frequency.
--
DuWayne  KV4QB

Re: Creating Gerber files for pcb construction

Laurence Oberman
 

So far I have used this vendor and I have only Awesome words for them.
My boards are only double sided but have a combination of SMD and through hole.
I use TIna to create the boards

PCBWAY.COM

On Wed, Jan 24, 2018 at 7:04 PM, Diver Martin <diver.martin@...> wrote:
Gordon,

I'm very curious about the jclpcb order you made. How is the PCB quality?
That's a vendor I wanted to try, but haven't gotten around to. They offer
many of the same features as my current pcb house in china (DFRobot) but at
about half the cost. Are the boards pictured from jcl or pcbway?

On Wed, Jan 24, 2018 at 3:57 PM, Gordon Gibby <ggibby@...> wrote:

First set of boards arrived today -- not sure why they shipped me TEN
boards, I only ordered five.
This is all new to me. Soldered in header sockets. Wished I'da thought
of that for ALL the i/o connections.

Found at least one error so far -- forgot to ground pin 5 of the LCD
display. Have not soldered in the op amp portion but got the LCD working
(after adding little ground wire) and verified that the Adafruit Si5351 is
bring controlled --- communications receiver hears it right where I send
its frequency to.

This so SO cool.....

Can't believe how much this forum has taught me in just a few weeks.
This is going to be huge for our local ARES group. Loads of skills they
can learn.

Gordon

________________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby
<ggibby@...>
Sent: Tuesday, January 23, 2018 4:35 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Creating Gerber files for pcb construction

I don't have the exact number, but one company was about $24 (including
shipping) and the other company was $28 (including shipping) --- 5 boards
each company. First time customer.

________________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of B C <k9wis@...>
Sent: Tuesday, January 23, 2018 4:19 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Creating Gerber files for pcb construction

what did those boards cost you??
Brian K9WIS

---- Gordon Gibby <ggibby@...> wrote:
Thanks to all your suggestions I made two trial orders:

pcbway.com

jlcpcb.com


About last friday night/saturday.

The first set is supposed to arrive sometime tomorrow (wednesday)

and the other set on Thursday. amazing.


Fingers crossed that I did this correctly!!!


Showed this project to my youngest son (working as a new auto mechanic)
and he was motivated to get out the christmas arduino kit I gave him and
immediately started building LED circuits....astonishing my wife and
me....may help him out in life.




________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby
<ggibby@...>
Sent: Sunday, January 21, 2018 12:09 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Creating Gerber files for pcb construction


Thanks for yet another great suggestion.


I have now created a "flying jumpers" breadboard version using a couple
of different resistive bridge designs --- the K6BEZ design driven by the
Si5351 directly didn't produce enough voltage to make the reverse
measurement accurate and I gave up after several hours on that. Would need
to add an amplification stage I believe... The easy swr indicator kit from
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.qrpkits.com_ezseries.html-23ezswr&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=wATr3kl2cd5RzPMIGfxbDzykiABvusgbH-fnLXPAkSA&e=<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.qrpkits.com_ezseries.html-23ezswr&d=DwMFAw&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=McWMTsaWY88BIHjI9RhDX8BXq0BroHl6MaH6P7zGTVo&s=iOg3ff6bkbrqV9BQbMsupWJHkEUhFqFcHTVOepLM0YM&e=>
(no LED, just take the rectified voltage and run into an op amp with a gain
of about 6) produced a voltage that seemed to work. My circuit is sorta
haywire (with egloo jumpers everywhere) and the pcb version would be FAR
MORE STABLE but I'm able to measure shorts, 25 ohm, 50 ohm, 100 ohm, 220
ohm and open circuit and get "sorta close SWR" measurements at frequencies
up to maybe 30 MHz. There is so much haywiredness to the breadboard that I
can't make any better observations at the moment. The PCB should be a ton
more mechanically stable. Earlier today I put it on a real antenna and it
did find the resonance.


A friend is working on the "single meter" SWR version using a toroidial
swr measurement head (which I also have built and should also work). The
goal there is to emulate the $129 LDG big meter display of SWR..... The
pcb that I cranked out (and now being built in China, fingers crossed!)
should work with both. (2 different inputs).


You folks are a lot brighter at this stuff than I am but it has been a
ton of fun just getting this much to work! I think this is going to be a
great building project for our ARES group.






________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of William R Maxwell
<wrmaxwell@...>
Sent: Saturday, January 20, 2018 5:02 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Creating Gerber files for pcb construction


Another to consider is
www.jlcpcb.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.jlcpcb.com&d=DwMF-g&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=IdE0tYxjCfc0L_NPXEC5rll-igwhgt6ppqTzraUYlNc&s=WtrSAHHYrh1yu_YDRixyHaUjQzv0a3Hp9-zY2b8fanM&e=>.
I have just received 10 boards for a mere $2 total, including DHL shipping.
Note the there is a sixe limit of 100mmx100mm, and two layers, green solder
resist and 1.6mm material.

This offer I think is limited to your initial order. A subsequent set of
3 boards, 10 copies each, cost me $29, including shipping.

Bill, VK7MX

On 21/01/2018 12:38 AM, Gordon Gibby wrote:
Wow!!! Thank you for that wonderful tip.

Sent from my iPhone

On Jan 20, 2018, at 06:51, Kerr Smith
<kerrsmithusa@...<mailto:kerrsmithusa@...>> wrote:

Have you looked at PCB Shopper? You just set the size of your PCB and
how any boards you require and it will list all the main PCB fabrication
sites and how much it will cost:


https://urldefense.proofpoint.com/v2/url?u=https-3A__pcbshopper.com&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=0xNqpq13ii9aT1Sh5iz_prDuqOsArD7fo-GvxVduS2A&e=<https://urldefense.proofpoint.com/v2/url?u=https-3A__pcbshopper.com&d=DwMFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=tVwyxBAPRZNQpdExa-g1tsq8okRaE7YCQUjWUUW6hMg&s=x1CZZZOSFNIXEjRrVRTlehkNhcaChUif1k7nsMKwx4Q&e=>

For my latest PCBs I tried AllPCB and was extremely pleased with the
results, they had an offer on at the time so for $5 I got 7 boards on one
order and for my second $5 order I got 17 boards (if your boards are small
they seem to add in extra to your order) - they were all shipped using TNT
and arrived in just 5 days. At the current time the total cost is $12 for 5
boards up to 35mm x 35mm with free TNT shipping:


https://urldefense.proofpoint.com/v2/url?u=http-3A__www.allpcb.com&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=XnTdlYHqFlKmjNeCLrFl6eNp9UdCG5Xzx2kDDYXCyOg&e=<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.allpcb.com_setinvite.aspx-3Finviteid-3D30276-26url-3Dhttp-3A__www.allpcb.com_online-5Fquote.html&d=DwMFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=tVwyxBAPRZNQpdExa-g1tsq8okRaE7YCQUjWUUW6hMg&s=VRALDmdsziyoxueeKz6mXPEvcc6DHC3hcVq_mlvqGIo&e=>

The other site I would recommend is OSHPark:


https://urldefense.proofpoint.com/v2/url?u=https-3A__oshpark.com&d=DwIFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=E2shNumHkU2z89FEz9fB1rmv1B9-9CwkXYgBQ56sX18&s=z3OHoUEftZQXgilq__PmOkVk9mUQmTqOuH12jAGHT0c&e=<https://urldefense.proofpoint.com/v2/url?u=https-3A__oshpark.com_&d=DwMFaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=3ELgZgmTnPzGsfvQxkd1S_2NGLYM8sHTxVCQKFxhVXQ&m=tVwyxBAPRZNQpdExa-g1tsq8okRaE7YCQUjWUUW6hMg&s=dqHZt9-lgSwySoNuMqvHedfU_5GT-Uu8usvQgbFEknc&e=>

They are the ones who do the purple PCBs which look really great and
also pretty cheap, only a few dollars (around $9.50) for three 35mm x 35mm
boards with shipping included.

I am so pleased that the price for creating PCBs yourself is now this
low, up until now I have been carefully making my own by etching them but
now I can get them in a few days if I need them fast or a couple of weeks if
I don't mind waiting. There are so many different fabrication sites there is
always going to be a great deal to be had if you shop around a bit, the PCB
Shopper site I mentioned above is really great for this.













--
Martin Held - AE7EU
http://ae7eu.com/
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If there aren't any questions, then what is there to learn?