Date   
Re: SMD size / resistor power values?

Michael Hagen
 

You can "Tombstone" 2 in series of 1/2 the value.

They stand up like an A formation. Tack solder at the top.  Gets them up in the air to dissipate.  Good way to double the power dissipation or use smaller sizes.

I hope 0603 stay popular, that is the smallest I can hand solder with my old eyes and shake.

I really like the fact that ASH used 1206's, they are big enough to hack easily.  They are going to become more expensive or go away as they get phased out for smaller parts.


73's Mike, WA6ISP


On 1/17/2018 8:45 AM, Jerry Gaffke via Groups.Io wrote:


I assume most of that 1/4 Watt of heat max from a 1206 is assumed to be dumped into a PC board,
not dissipated into the air like a 1/4 Watt axial leaded resistor.
So best to derate to 1/8 Watt or so if hacking them in ugly style.

R141 on the Bitx40 is dissipating over 1/4 Watt, not a bad idea to replace it with something bigger
if it ever burns out on you.  Not many have reported this, but it does happen.
High ambient temps, high power supply voltages, and/or long key/PTT down times will do it.

Jerry, KE7ER



On Wed, Jan 17, 2018 at 08:35 am, Jerry Gaffke wrote:

All resistors are 1206's, 1/4 Watt.
So 0.12 inches long, 0.06 inches wide.
    http://www.resistorguide.com/resistor-sizes-and-packages/

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

Re: Flashing firmware from Linux.

at91r40008
 

Ian,

where can I find your 0.27 sketch? I searched the file section but couldn't your name, call or 0.27.
I apologize if is there and I didn't see it.

Thanks.
--
73, Yvon NU6I

Re: Rugged Case Options? #ubitx

Jim Strohm
 

I got a broken DVD player over the weekend and gutted it. The bezel is good enough to support controls, and I can use my inkjet printer to print water slide decals.
73 Jim N6OTQ

Bitx40v3 wiring up Raduino query. #bitx40help

G1WDF
 

Just spending some time today finishing off my bitx40v3. 
I have a couple of questions.
8 pin connector installed. 5 spare wires? Is that normal?
5 pin connector installation halted for now.
Hfsigs website has black wire to dc socket and orange to power switch on volume.
Black to negative? Orange to positive?
Yellow wire not connected?
Just want to be certain, have let magisc smoke out too many times in the past.

Cheers, Richard.

Re: SMD size / resistor power values?

Jerry Gaffke
 


I assume most of that 1/4 Watt of heat max from a 1206 is assumed to be dumped into a PC board,
not dissipated into the air like a 1/4 Watt axial leaded resistor.
So best to derate to 1/8 Watt or so if hacking them in ugly style.

R141 on the Bitx40 is dissipating over 1/4 Watt, not a bad idea to replace it with something bigger
if it ever burns out on you.  Not many have reported this, but it does happen.
High ambient temps, high power supply voltages, and/or long key/PTT down times will do it.

Jerry, KE7ER



On Wed, Jan 17, 2018 at 08:35 am, Jerry Gaffke wrote:

All resistors are 1206's, 1/4 Watt.
So 0.12 inches long, 0.06 inches wide.
    http://www.resistorguide.com/resistor-sizes-and-packages/

Re: SMD size / resistor power values?

Michael Hagen
 

Most look to be 1206 footprint.

Don't worry about power, the size sets the power.

We are lucky, they are the largest used mostly these days.  0805 will solder nicely in there too.

I buy from Mouser.  I have all values and probably 50 1% values.  I buy 100-500 at a time of a value.

On Mouser, hit the lowest price first button.  Lately I bought all my 1, 10, 100K values in 1%.

They were cheaper than 5%!

The more you see they have in stock, that is probably the best buy.

73's

Mike, WA6ISP


On 1/17/2018 8:05 AM, Sean W7SKD wrote:

I have been looking at some of the hacks that require changing out values on the uBitx and bitx40 boards, and have a (hopefully simple question): what size and power value are the smd resistors?  I'm putting an order together for electronic components and want to make sure I get the right (same) physical size and the right power value.

thanks!

Sean 

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

Re: SMD size / resistor power values?

Jerry Gaffke
 

All resistors are 1206's, 1/4 Watt.
So 0.12 inches long, 0.06 inches wide.
    http://www.resistorguide.com/resistor-sizes-and-packages/



On Wed, Jan 17, 2018 at 08:05 am, Sean W7SKD wrote:
I have been looking at some of the hacks that require changing out values on the uBitx and bitx40 boards, and have a (hopefully simple question): what size and power value are the smd resistors?  I'm putting an order together for electronic components and want to make sure I get the right (same) physical size and the right power value.

SMD size / resistor power values?

Sean W7SKD
 


I have been looking at some of the hacks that require changing out values on the uBitx and bitx40 boards, and have a (hopefully simple question): what size and power value are the smd resistors?  I'm putting an order together for electronic components and want to make sure I get the right (same) physical size and the right power value.

thanks!

Sean 

Re: Raduino programming question

Tim Gorman
 

The Raduino provides all the RF signals for the unit, vfo/mixer/etc.

The rest of the unit won't work without it so you may as well power the
whole thing down before removing the Raduino.

tim ab0wr

On Wed, 17 Jan 2018 06:45:47 -0800
"q q via Groups.Io" <bzmdrc=yahoo.com@groups.io> wrote:

Does the Raduino have to be installed to the Bitx40 or uBitx and be
powered on or can I remove the Raduino from the rig and plug it, via
USB cable, into my computer to load firmware? Thanks Bob
N1ETS

Second batch of uBITX shipping? #ubitx

Nigel G4ZAL
 

I just got notified my uBITX has shipped today (India post) and I ordered late in the day on 13th December 2017, I guess I missed the original batch?
I see some had ordered on the 13th as well and had theirs shipped from the 1st batch a couple of weeks ago.
Expecting 2 or 3 weeks to the UK...

Nigel - G4ZAL

Re: #ubitx and 6 meters #ubitx

M Garza <mgarza896@...>
 

If I get some time this evening, I will give it a test.  I will also get to see how the radio handles 30 degree temps (it's in the garage).

Marco - KG5PRT 

On Jan 17, 2018 9:34 AM, "Tom Christian" <tmchristian@...> wrote:
Thank you, Sarma! (and Marco).  Once my ubitx finally arrives, I'll follow up.
Tom
AB7WT

Micro BITX Order UPDATE

David Robertson <kd1na363@...>
 

Micro BITX order update 



Got a response from an e-mail I sent to hfsigs.com about my order. They are currently shipping Micro BITX kits from orders received on 
December 14, 2017. My order was received by them on 
December 16 so it looks like they are getting close. Patience all who are waiting, myself included.
73
Dave KD1NA 

Re: Mica Cap replacements for WA2EBY Filter?

M Garza <mgarza896@...>
 

Here are some sites that i use for silver mica caps:
Allelectronics
RF Parts
Jameco
Ebay - when buying more than a couple of pieces.

Good luck,

Marco - KG5PRT 

On Jan 17, 2018 9:26 AM, "N8DAH" <Dherron@...> wrote:

Mark,

I used kits and parts as well a some NoS from ebay. Yes 500V to 1KV is best for this application. I have some NoS 1500pf and 2700pf, if you can't find any at a good price let me know we can work it out.

 

http://kit-projects.com/AMP.htm Bottom has some useful links

 

73

  GL with the build!

David

 

 

Re: Raduino v2.03 (BFO calibration for CW) released #bitx40

 

Hiro,

 The C91,C92 mod is for the USB mod. The Part that you remove for the V2 mod R101 is to disable the hardware BFO as you will use the other clk out of the raduino.

 

 73

    Hope that helps

Re: #ubitx and 6 meters #ubitx

Tom Christian
 

Thank you, Sarma! (and Marco).  Once my ubitx finally arrives, I'll follow up.
Tom
AB7WT

Re: Raduino v2.03 (BFO calibration for CW) released #bitx40

aidahappy@...
 

Hi  Allard  san  

     I installed V1.27.5 and I am using capacitive touchkeyer and another many function. Fine tuning is very good.  
     I ask question that why remove C91 C92 1000PF condenser  for V2 (BFO).  
     Is it possible that sidetone comes out without relay working when recieving and Semi-QSK : OFF in CW mode? 
   
  Hiro  JH1OJY

Re: Mica Cap replacements for WA2EBY Filter?

 

Mark,

I used kits and parts as well a some NoS from ebay. Yes 500V to 1KV is best for this application. I have some NoS 1500pf and 2700pf, if you can't find any at a good price let me know we can work it out.

 

http://kit-projects.com/AMP.htm Bottom has some useful links

 

73

  GL with the build!

David

 

 

Re: Mica Cap replacements for WA2EBY Filter?

Jack, W8TEE
 

Kits and Parts has SM caps, 500V, for $1.30-2.75 depending on value. See if that helps, plus the owner, Diz (W8DIZ), is most helpful in all matters.

Jack, W8TEE



From: Mark Baldridge <marktbaldridge@...>
To: BITX20@groups.io
Sent: Wednesday, January 17, 2018 10:04 AM
Subject: [BITX20] Mica Cap replacements for WA2EBY Filter?

Greetings all,

This is a little off topic I know, but I have been compiling a parts list to build the WA2EBY amplifier and was at about $12 until I started to add the mica capacitors. About $4 a pop!! That would be about $70 

Are there any reasonable modern replacements for mica capacitors? I'm assuming that SWR tolerances are what demand the 500V rating?

Here's a link to the old QST article.



Thanks!

--
Mark Baldridge
KC9DZT



Virus-free. www.avast.com

Re: Mica Cap replacements for WA2EBY Filter?

Ken
 

On Wed, Jan 17, 2018 at 10:04 AM, Mark Baldridge <marktbaldridge@...> wrote:
Greetings all,

This is a little off topic I know, but I have been compiling a parts list to build the WA2EBY amplifier and was at about $12 until I started to add the mica capacitors. About $4 a pop!! That would be about $70 

Are there any reasonable modern replacements for mica capacitors? I'm assuming that SWR tolerances are what demand the 500V rating?

Here's a link to the old QST article.



Thanks!

--
Mark Baldridge
KC9DZT


Re: Raduino programming question

Vic WA4THR
 

Actually, the BitX needs to be turned off if you are programming the Raduino, but you can completely disconnect it and power it through the USB port for programming.

=Vic=