Date   
Re: RD16HHF1 in the uBITX #ubitx

K5ESS
 

Eric,

Couldn’t find your earlier link to “Cash’s video”.  Could you re-post.

Thanks

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Eric KE6US
Sent: Wednesday, February 21, 2018 12:07 PM
To: BITX20@groups.io
Subject: Re: [BITX20] RD16HHF1 in the uBITX

 

Looks fine. Mine is from Michael's rated at 360w. It was $20. WalMart might even be cheaper. They're probably all nearly identical. Mine looks like the one you show except for packaging details. BTW, it's super for heat shrink tubing too.

You control the heat with the distance from the piece. I start out about a foot away to get the board warmed up to a point where I don't want to touch it, Keep the end moving. Watch Cash's video that I link to earlier. It's really that easy.

Don't get too close to the part while the solder paste is still grey. There's a point where the solder paste starts getting a little glossy and slick. You can blow the part right off the pads if you get too aggressive. For that matter, I often tape smaller PCBs down as they can scoot around from the air flow too. Then it's magic. The solder turns silver, the part aligns itself right on the pads better than you did, and it's a thing of beauty.

On very tiny parts, say ones with 0.5 pitch pins, you can get solder bridges. Don't worry about them. A light touch with solder wick and a soldering iron and they disappear leaving the part perfectly soldered in place. On many tiny parts with lots of legs, I just lay down a running blob of solder that shorts all the pins together, then wick up the excess. I did about a dozen AD9850s that way. All perfect.

I understand some guys have tremors and other things that would make SMT difficult. It takes a steady hand to place the parts but not nerves of steel. I suspect anyone who can walk from the kitchen to their workbench with a full cup of coffee without spilling any could manage the larger SMTs without difficulty.

SMTs open up a whole new world of kit building and homebrew possibilities. They aren't limiting our abilities at all. We're doing that to ourselves.

Eric KE6US

 

On 2/20/2018 9:21 PM, VE7WQ wrote:

Thank you Eric,

 

What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or any craft store ?

 

73! George

VE7WQ

 

Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste and a $20 

EK> embossing tool (heat gun) from WalMart or any craft store. It makes the 

EK> 20-QFN or any other SMT easy. 

 

Re: Variable power control

Walter
 

So do I need both the 10k ohm resistor from c1 to ground and the make before break rotary or just one or the other?

Re: Connectors

James Lynes
 

Paul:

I ordered the connector shells/hoods from Tayda.

"Housing Connector 2.54mm"

Pins 2, 3, 4, 5, 8, 12
Part # A-826, A-827, A-828, A-829, A-832, A-835

Ordered a mix of sizes (+/- 300 total). Cost about $10 USD including shipping.

I ordered the pins from Mouser. I believe  4 cents per pin.
538-08-51-0108-CT  cut tape/reel
538-08-51-0108-LP loose pins

James

Re: uBITIX Shipped

WA9GQT@...
 

uBITX ordered on 12-23-2017. Received shipping email on Mon, Feb 19, 2018 5:29 am with DHL tracking number. It was delivered to me on Wed Feb 21, 2018 11:55am.
That was definitely worth the extra $10. Wow, very impressive! Thanks Farhan and all.
73, Rod WA9GQT

Re: Variable power control

LKNDAVE
 

2 more things, a 10k from + of c1 to ground will stop voltage screaming to the rail while changing it with power on. if you go to a rotary make sure it is make before break and the spike wont happen.i am going to fix the size of the wschem but i needed folks to see what have done 
dave

Re: Variable power control

LKNDAVE
 

THE ZENERS SET THE PASS VOLTAGE OF THE 100 VOLT 10 AMP DARLINGTON. sorry caps lock. they are 1 amp devices but the transistor slaves them to 10 amp handling. i have used this ciruit fo over 40 years. tayda has most of the parts, total like 5 bucks plus cheap shipping. read notes on schem. this is a 2 voltage control. my crappy software didnt have 4 position rotaries but most will get the idea. the transistor also has reverse emf diode built in.
dave

Re: RD16HHF1 in the uBITX #ubitx

VE7WQ <v@...>
 

Thank you Eric, for the very valuable tips, can't wait to try it out. 

How do you protect the other components from the hot air?


73! George

VE7WQ


Wednesday, February 21, 2018, you wrote:

EK>  It's really that easy.

EK> and it's a thing of beauty.

EK> I did about a dozen AD9850s that way. All perfect.


EK> Eric KE6US


Re: Testing 1:1 Ferrite Transformers

K9HZ <bill@...>
 

If you were to measure the actual impedance, you would probably find that the transformer is reactive (imagine that! ). You might try a little capacitor across the windings to counter that.  


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Feb 21, 2018, at 10:03 AM, Michael Hagen <motdog@...> wrote:

I had a few days playing with my crystal filter PCBs.
I spent most of Sunday learning about my Siglent SA.  Spectrum Sunday!
I had in stored out in the shed, a sin.  I don't have room for all this stuff.

I used the tall 12 MHZ crystals.  From tests a year ago, I determined from all the testing that the cap value was 240 pF.
This is the 8 crystal filter, just like the one in uBit.  The PCB has 2 Pin Molex and matching transformers at each end.
I used Molex connected RG174 with BNCs about 1 ft long.

I made connections to the PCB for the crystals with "Machine Pins".  Nice fit.    Again tested the crystals in an Oscillator so all 8 were selected to under 70 Hz.   I did notice trimming the leads upped the frequency some.  They are trimmed to about 1/4".
I have 1:2 transformers on the 2 hole cores. I connected them as auto-transformers.
I saw about a 1.7 KHz filter with at least 4 dB ripple in the pass band.
I have tried 220pF and 270pF.
So, I started testing transformers.  I set up the SA with a Directional Coupler to measure Reflection Cooef.
Thus SWR.   I tried winding different transformers.   At 12 MHz, the best SWR I could get was 1.6 :1?
Bifilar twisted around a toroid, and used full transformer (isolated not auto connection) with a 47 Ohm SM
on the output.  With an SMA 50 Ohm Dummy I get reflection of -22 dB (really good).  With the transformer
setup I get about 12-13 (SWR 1.6).

Is this the best it gets?   How should I otherwise match my crystal filter.   Is that causing the ripple.
I thought I was driving the filter with about 200 Ohms?

What say the real RF guys?

Thanks, Mike, WA6ISP
 

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

Re: Variable power control

K9HZ <bill@...>
 

Zeners probably wont work for this application by themselves because the loading requirements are too great.  They may work as drivers for higher current transistors though. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Feb 21, 2018, at 9:53 AM, Walter <W9KJO@...> wrote:

If you could draw this up that would be great.  I am no EE just a layman enjoying the hobby. 

From what I can tell Zeners are in the mAmp range and I thought I was told in an earlier post that I needed in the 3 to 5 amp range.  Perhaps you can tell me how this works out?  I'm sure there is a way.

I have a boost power supply I can put on my 13.8 VDC supply to boost this voltage up to 24 VDC or perhaps a little less to give me the maximum allowable voltage for the PA line (Again an earlier post by another with great advice).  I have ordered a 6 position rotary switch to mount on my front panel.  it is actually 2 pole rather than one so I thought I would use the other set of poles for LED's to show what power setting I am on, not necessary but LED's are always a fun add :)

You help will be greatly appreciated and a drawing would help me greatly.

Thanks and 73 W9KJO

Re: rv2- messed up setting and txing like mad!!!

Alan -MMØWXT
 

Jerry. I was reading an article I mistook RV1 for RV2, got into a panic and before I knew it I was in the "Keeck" as we say in Scotland :-)

Tiredness, panic and daftness. I will now go and stick the Conical Hat on , and go stand in a corner.....

I did not press PTT, I had Power direct into rf power and ammeter in series with 12v power line, soon as 12v gets plugged in smokey...Fairly sure IRF, But could have been the entire capacitor bank at the Low pass filters...HOPE NOT!!!!!

Had an IRF510 , so put it in.

Not fired her up yet.
Should I have ammeter across both 12v and pa power?

Thanks

Alan

Re: RD16HHF1 in the uBITX #ubitx

Eric KE6US
 

Looks fine. Mine is from Michael's rated at 360w. It was $20. WalMart might even be cheaper. They're probably all nearly identical. Mine looks like the one you show except for packaging details. BTW, it's super for heat shrink tubing too.

You control the heat with the distance from the piece. I start out about a foot away to get the board warmed up to a point where I don't want to touch it, Keep the end moving. Watch Cash's video that I link to earlier. It's really that easy.

Don't get too close to the part while the solder paste is still grey. There's a point where the solder paste starts getting a little glossy and slick. You can blow the part right off the pads if you get too aggressive. For that matter, I often tape smaller PCBs down as they can scoot around from the air flow too. Then it's magic. The solder turns silver, the part aligns itself right on the pads better than you did, and it's a thing of beauty.

On very tiny parts, say ones with 0.5 pitch pins, you can get solder bridges. Don't worry about them. A light touch with solder wick and a soldering iron and they disappear leaving the part perfectly soldered in place. On many tiny parts with lots of legs, I just lay down a running blob of solder that shorts all the pins together, then wick up the excess. I did about a dozen AD9850s that way. All perfect.

I understand some guys have tremors and other things that would make SMT difficult. It takes a steady hand to place the parts but not nerves of steel. I suspect anyone who can walk from the kitchen to their workbench with a full cup of coffee without spilling any could manage the larger SMTs without difficulty.

SMTs open up a whole new world of kit building and homebrew possibilities. They aren't limiting our abilities at all. We're doing that to ourselves.

Eric KE6US


On 2/20/2018 9:21 PM, VE7WQ wrote:

Thank you Eric,


What do you think about this heat gun on eBay?

110V 300W Hot Air Gun Hand Hold Mini Heat Gun for Embossing Heat Tool $10.76

https://tinyurl.com/y7vrbfvt

Or should I buy a $20 embossing tool (heat gun) from WalMart or any craft store ?


73! George

VE7WQ


Tuesday, February 20, 2018, among other things you wrote:

EK> A syringe, a small tweezer to place the parts, solder paste and a $20 

EK> embossing tool (heat gun) from WalMart or any craft store. It makes the 

EK> 20-QFN or any other SMT easy. 


Re: Second batch of uBITX shipping? #ubitx

Dennis Voorhees
 

Okay here's my Story. Order on December 22, late in the day. Knew it would be a while, but paid $10 for DHL delivery anyway. Fast Forward to Monday February 19, the day before yesterday. Checked Paypal and sure enough It was shipped, around 5pm their local time (10 1/2 hours ahead of us so around 6am Est. The DHL tracking  said 'Delivery by end of day Wednesday, February 21", today. After traveling through a couple locations in India, then Germany, Cincinnati, Rochester, NY, the package arrived at 12:04  pm today at my door in Sayre, Pa 125 miles from Rochester, NY. To say I'm impressed and delighted is an understatement. Nice here today,so I'll be  heating up the iron tomorrow. Let the fun begin. 

On Tue, Feb 20, 2018 at 2:01 PM, Jacob Farnes via Groups.Io <kk6jtl@...> wrote:
Dec 25, 2017 order

Received notification of shipping via Paypal Feb. 20, 2018


Re: RD16HHF1 in the uBITX #ubitx

VE7WQ <v@...>
 

Thank you Vince,


I have a roll of kapton tape here, bought it for general insulation purpose.

It'l be handy for smd work then.


73! George

VE7WQ


Wednesday, February 21, 2018, you wrote:

VV> Yes, Kapton Tape is recommended when using hot air for [de]soldering.


VV> Vince.




VV> On 02/21/2018 09:10 AM, Jack Purdum via Groups.Io wrote:

>> Don't know about the tape...never tried it, but I don't see why it

>> wouldn't work.

>>

>> Jack, W8TEE

>>

>>

>> ------------------------------------------------------------------------

>> *From:* VE7WQ <v@...>

BITX20@groups.io

>> *Sent:* Wednesday, February 21, 2018 12:07 AM

>> *Subject:* Re: [BITX20] RD16HHF1 in the uBITX

>>

>> Thank you Jack,

>>

>> I ordered a SMT SMD Component Welding Practice Board Kit US $0.99

http://tinyurl.com/ya7l9hym

>>

>> Question, could I use this tape:

>> Self-adhesive Tape Soldering High Temperature Heat Resistant for BGA PCB

>> SMT US $0.99

https://tinyurl.com/yak4p4ea

>> with my Hakko FX-901 Cordless Soldering Iron to solder SMTs, SMDs?

>>

>> 73! George

>> VE7WQ

>>

>> Tuesday, February 20, 2018, you wrote:

>> JPvGI> Sorry about that. See ebay #192343157603 and picture at bottom.

>> JPvGI> Jack, W8TEE

>>

>>

v@...:v@...>>

BITX20@...:BITX20@groups.io>

>>

>>

>>

>> JPvGI> #yiv0457961818 #yiv0457961818 --body {margin:5px 5px 5px

>> JPvGI> 5px;background-color:#fdf4d7;}#yiv0457961818 #yiv0457961818 hr

>> JPvGI> {color:#000000;}#yiv0457961818 body, #yiv0457961818 table

>> #yiv0457961818

>> JPvGI>

>> {font-size:12pt;font-style:normal;font-weight:normal;color:#000000;text-decoration:none;}#yiv0457961818

>> JPvGI> span.yiv0457961818rvts1 #yiv0457961818

>> JPvGI> {font-size:10pt;font-weight:bold;color:#0000ff;}#yiv0457961818

>> JPvGI> span.yiv0457961818rvts2 #yiv0457961818

>> JPvGI> {font-size:10pt;font-weight:bold;color:#000080;}#yiv0457961818

>> JPvGI> span.yiv0457961818rvts3 #yiv0457961818

>> JPvGI> {font-size:10pt;font-style:italic;color:#800000;}#yiv0457961818

>> JPvGI> a.yiv0457961818rvts4, #yiv0457961818 span.yiv0457961818rvts4

>> JPvGI> #yiv0457961818

>> JPvGI>

>> {font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818

>> JPvGI> a.yiv0457961818rvts5, #yiv0457961818 span.yiv0457961818rvts5

>> JPvGI> #yiv0457961818

>> JPvGI>

>> {font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818

>> JPvGI>

>> span.yiv0457961818rvts6{font-style:italic;color:#ff0000;}#yiv0457961818

>> JPvGI>

>> span.yiv0457961818rvts7{font-style:italic;color:#ff0000;}#yiv0457961818

>> JPvGI> a.yiv0457961818rvts8, #yiv0457961818

>> JPvGI>

>> span.yiv0457961818rvts8{color:#0000ff;text-decoration:underline;}#yiv0457961818

>> JPvGI> #yiv0457961818 p, #yiv0457961818 ul, #yiv0457961818 ol #yiv0457961818

>> JPvGI> {text-align:left;text-indent:0px;padding:0px 0px 0px

>> 0px;margin:0px 0px

>> JPvGI> 0px 0px;}#yiv0457961818 .yiv0457961818rvps1 #yiv0457961818

>> JPvGI> {text-align:center;}#yiv0457961818 Hello Jack,

>> JPvGI> With three of what? No picture (:The whole thing cost $2.29 with

>> free shipping!URL please.

>> JPvGI> 73! GeorgeVE7WQ

>> JPvGI> Tuesday, February 20, 2018, you wrote:JPvGI> I've run into the SMT

>> JPvGI> inertia as well. AT our club meeting next month, IJPvGI> am

>> setting up

>> JPvGI> three solder stations with three of these:

>> JPvGI>> and I'm going to have the members each solder as small a part as

>> theyJPvGI> can handle. I think once they do it, they will see how easy

>> it really is.JPvGI> BTW, when done and voltage is applied at the bottom

>> center of the wheel,JPvGI> the LED's should light up. The whole thing

>> cost $2.29 with free shipping!JPvGI> Once they see how easy it is, then

>> I'm going to push how cheap the SMT's are.JPvGI> Jack, W8TEE

>>

>>

>>

>>

>>

>>

>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>

www.avast.com

>> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link>

>>

>>

>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>



DDS/VFO output #bitx40

Gavin Jacobs
 

I'm working on a Bitx40, that was initially purchased without the Raduino; but now I have a Raduino and I need to verify that the DDS is correctly driving the mixer. On the Bitx40V3 schematic, I removed L4, C95, C93, C91, and C92. I connected the Raduino CLK output to connector DDS1. I was messing around in that area a bit, and I suspect I've messed up something, so I would like to ask if someone can post a waveform from the collector of Q7. What I'm seeing is at the right frequency, but it only has an amplitude of 2Vpk-pk and a DC offset of +10V. I expected to see a wider swing. Any scope shots or description appreciated.

Thanks,
Jake

Re: rv2- messed up setting and txing like mad!!!

Jerry Gaffke
 

Don't get me wrong, I applaud your willingness to reach in and play with your uBitx.
That's what these rigs are all about.
Just taking the opportunity to let others in the forum know that twiddling RV2 and RV3 
can have negative consequences.


On Wed, Feb 21, 2018 at 08:49 am, Jerry Gaffke wrote:
And would also guess that the reason for your failure is mindless twiddling of RV2, RV3.
These should be set properly at hfsignals and most of us will likely never have reason to mess with them.

Re: RD16HHF1 in the uBITX #ubitx

Roy Appleton
 

Vince, I'd like to know more about the uses of that tape. Do you have any additional tips or links to explanations of the tape?

Thanks
Roy
WA0YMH

On Feb 21, 2018 10:50 AM, "Vince Vielhaber" <vev@...> wrote:
Yes, Kapton Tape is recommended when using hot air for [de]soldering.

Vince.




On 02/21/2018 09:10 AM, Jack Purdum via Groups.Io wrote:
Don't know about the tape...never tried it, but I don't see why it
wouldn't work.

Jack, W8TEE


------------------------------------------------------------------------
*From:* VE7WQ <v@...>
*To:* BITX20@groups.io
*Sent:* Wednesday, February 21, 2018 12:07 AM
*Subject:* Re: [BITX20] RD16HHF1 in the uBITX


Thank you Jack,

I ordered a SMT SMD Component Welding Practice Board Kit US $0.99
http://tinyurl.com/ya7l9hym

Question, could I use this tape:
Self-adhesive Tape Soldering High Temperature Heat Resistant for BGA PCB
SMT US $0.99
https://tinyurl.com/yak4p4ea
with my Hakko FX-901 Cordless Soldering Iron to solder SMTs, SMDs?

73! George
VE7WQ

Tuesday, February 20, 2018, you wrote:
JPvGI> Sorry about that. See ebay #192343157603 and picture at bottom.
JPvGI> Jack, W8TEE


v@... <mailto:v@...>>
BITX20@groups.io <mailto:BITX20@groups.io>




JPvGI> #yiv0457961818 #yiv0457961818 --body {margin:5px 5px 5px
JPvGI> 5px;background-color:#fdf4d7;}#yiv0457961818 #yiv0457961818 hr
JPvGI> {color:#000000;}#yiv0457961818 body, #yiv0457961818 table
#yiv0457961818
JPvGI>
{font-size:12pt;font-style:normal;font-weight:normal;color:#000000;text-decoration:none;}#yiv0457961818
JPvGI> span.yiv0457961818rvts1 #yiv0457961818
JPvGI> {font-size:10pt;font-weight:bold;color:#0000ff;}#yiv0457961818
JPvGI> span.yiv0457961818rvts2 #yiv0457961818
JPvGI> {font-size:10pt;font-weight:bold;color:#000080;}#yiv0457961818
JPvGI> span.yiv0457961818rvts3 #yiv0457961818
JPvGI> {font-size:10pt;font-style:italic;color:#800000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts4, #yiv0457961818 span.yiv0457961818rvts4
JPvGI> #yiv0457961818
JPvGI>
{font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI> a.yiv0457961818rvts5, #yiv0457961818 span.yiv0457961818rvts5
JPvGI> #yiv0457961818
JPvGI>
{font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI>
span.yiv0457961818rvts6{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI>
span.yiv0457961818rvts7{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts8, #yiv0457961818
JPvGI>
span.yiv0457961818rvts8{color:#0000ff;text-decoration:underline;}#yiv0457961818
JPvGI> #yiv0457961818 p, #yiv0457961818 ul, #yiv0457961818 ol #yiv0457961818
JPvGI> {text-align:left;text-indent:0px;padding:0px 0px 0px
0px;margin:0px 0px
JPvGI> 0px 0px;}#yiv0457961818 .yiv0457961818rvps1 #yiv0457961818
JPvGI> {text-align:center;}#yiv0457961818 Hello Jack,
JPvGI> With three of what? No picture (:The whole thing cost $2.29 with
free shipping!URL please.
JPvGI> 73! GeorgeVE7WQ
JPvGI> Tuesday, February 20, 2018, you wrote:JPvGI> I've run into the SMT
JPvGI> inertia as well. AT our club meeting next month, IJPvGI> am
setting up
JPvGI> three solder stations with three of these:
JPvGI>> and I'm going to have the members each solder as small a part as
theyJPvGI> can handle. I think once they do it, they will see how easy
it really is.JPvGI> BTW, when done and voltage is applied at the bottom
center of the wheel,JPvGI> the LED's should light up. The whole thing
cost $2.29 with free shipping!JPvGI> Once they see how easy it is, then
I'm going to push how cheap the SMT's are.JPvGI> Jack, W8TEE






<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon>
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<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link>


<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>


--
  Michigan VHF Corp.   http://www.nobucks.net/   http://www.CDupe.com/
                          http://www.metalworkingfun.com




Re: RD16HHF1 in the uBITX #ubitx

Vince Vielhaber
 

Yes, Kapton Tape is recommended when using hot air for [de]soldering.

Vince.

On 02/21/2018 09:10 AM, Jack Purdum via Groups.Io wrote:
Don't know about the tape...never tried it, but I don't see why it
wouldn't work.

Jack, W8TEE


------------------------------------------------------------------------
*From:* VE7WQ <@VE7WQ>
*To:* BITX20@groups.io
*Sent:* Wednesday, February 21, 2018 12:07 AM
*Subject:* Re: [BITX20] RD16HHF1 in the uBITX

Thank you Jack,

I ordered a SMT SMD Component Welding Practice Board Kit US $0.99
http://tinyurl.com/ya7l9hym

Question, could I use this tape:
Self-adhesive Tape Soldering High Temperature Heat Resistant for BGA PCB
SMT US $0.99
https://tinyurl.com/yak4p4ea
with my Hakko FX-901 Cordless Soldering Iron to solder SMTs, SMDs?

73! George
VE7WQ

Tuesday, February 20, 2018, you wrote:
JPvGI> Sorry about that. See ebay #192343157603 and picture at bottom.
JPvGI> Jack, W8TEE


@VE7WQ <mailto:@VE7WQ>>
BITX20@groups.io <mailto:BITX20@groups.io>



JPvGI> #yiv0457961818 #yiv0457961818 --body {margin:5px 5px 5px
JPvGI> 5px;background-color:#fdf4d7;}#yiv0457961818 #yiv0457961818 hr
JPvGI> {color:#000000;}#yiv0457961818 body, #yiv0457961818 table
#yiv0457961818
JPvGI>
{font-size:12pt;font-style:normal;font-weight:normal;color:#000000;text-decoration:none;}#yiv0457961818
JPvGI> span.yiv0457961818rvts1 #yiv0457961818
JPvGI> {font-size:10pt;font-weight:bold;color:#0000ff;}#yiv0457961818
JPvGI> span.yiv0457961818rvts2 #yiv0457961818
JPvGI> {font-size:10pt;font-weight:bold;color:#000080;}#yiv0457961818
JPvGI> span.yiv0457961818rvts3 #yiv0457961818
JPvGI> {font-size:10pt;font-style:italic;color:#800000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts4, #yiv0457961818 span.yiv0457961818rvts4
JPvGI> #yiv0457961818
JPvGI>
{font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI> a.yiv0457961818rvts5, #yiv0457961818 span.yiv0457961818rvts5
JPvGI> #yiv0457961818
JPvGI>
{font-size:10pt;color:#008000;text-decoration:underline;}#yiv0457961818
JPvGI>
span.yiv0457961818rvts6{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI>
span.yiv0457961818rvts7{font-style:italic;color:#ff0000;}#yiv0457961818
JPvGI> a.yiv0457961818rvts8, #yiv0457961818
JPvGI>
span.yiv0457961818rvts8{color:#0000ff;text-decoration:underline;}#yiv0457961818
JPvGI> #yiv0457961818 p, #yiv0457961818 ul, #yiv0457961818 ol #yiv0457961818
JPvGI> {text-align:left;text-indent:0px;padding:0px 0px 0px
0px;margin:0px 0px
JPvGI> 0px 0px;}#yiv0457961818 .yiv0457961818rvps1 #yiv0457961818
JPvGI> {text-align:center;}#yiv0457961818 Hello Jack,
JPvGI> With three of what? No picture (:The whole thing cost $2.29 with
free shipping!URL please.
JPvGI> 73! GeorgeVE7WQ
JPvGI> Tuesday, February 20, 2018, you wrote:JPvGI> I've run into the SMT
JPvGI> inertia as well. AT our club meeting next month, IJPvGI> am
setting up
JPvGI> three solder stations with three of these:
JPvGI>> and I'm going to have the members each solder as small a part as
theyJPvGI> can handle. I think once they do it, they will see how easy
it really is.JPvGI> BTW, when done and voltage is applied at the bottom
center of the wheel,JPvGI> the LED's should light up. The whole thing
cost $2.29 with free shipping!JPvGI> Once they see how easy it is, then
I'm going to push how cheap the SMT's are.JPvGI> Jack, W8TEE






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Re: rv2- messed up setting and txing like mad!!!

Jerry Gaffke
 

A few more details here please:

Is the receiver working properly now?
When you measured "Current 170. Smoke coming", is that 170mA and what current were you measuring and were you pressing PTT?

It should take several Amps into PA-PWR for an IR510 to smoke like that and few of us have 170 Amp power supplies.
So my best guess is that you measured 170ma into the main board and didn't include PA-PWR in that measurement.

And would also guess that the reason for your failure is mindless twiddling of RV2, RV3.
These should be set properly at hfsignals and most of us will likely never have reason to mess with them.

Jerry, KE7ER


On Wed, Feb 21, 2018 at 08:30 am, <mm0wxt@...> wrote:

Zero volts on KT1 pad and 250ma draw on receive. No raduino going mad. So as sugested PA POWER.
3. Setup ammeter to measure current. Hoked up pa. Current 170, smoke coming i think from first 
Irf510. It was hot, rightside irf520 cold. Rig only on 2-3 secs.

Re: Testing 1:1 Ferrite Transformers

Michael Hagen
 

I answered some of the questions, method.

I made a tight setup with everything connected with SMA connectors on a tiny PCB.

Shorten leads on the transformer.  Now much better! SWR about 1.3:1 ?  This was all done at 12 MHZ with 1 MHz span.

Inductance on 3/8" ferrite toroid 6T #30 was measured at about 18uH.

So I am expecting it hard to get much better.  My SMD resistor 0805 47 Ohm,  and I forgot to measure it.

So this is why PCBs need to be small and laid out well.  Cheap SMA connectors from eBay sure make testing easier.

Impedance matching as most have stated, is the big deal in RF design.  Getting 50 ohms is tough.

73's

Mike, WA6ISP



On 2/21/2018 8:03 AM, Michael Hagen wrote:
I had a few days playing with my crystal filter PCBs.
I spent most of Sunday learning about my Siglent SA.  Spectrum Sunday!
I had in stored out in the shed, a sin.  I don't have room for all this stuff.

I used the tall 12 MHZ crystals.  From tests a year ago, I determined from all the testing that the cap value was 240 pF.
This is the 8 crystal filter, just like the one in uBit.  The PCB has 2 Pin Molex and matching transformers at each end.
I used Molex connected RG174 with BNCs about 1 ft long.

I made connections to the PCB for the crystals with "Machine Pins".  Nice fit.    Again tested the crystals in an Oscillator so all 8 were selected to under 70 Hz.   I did notice trimming the leads upped the frequency some.  They are trimmed to about 1/4".
I have 1:2 transformers on the 2 hole cores. I connected them as auto-transformers.
I saw about a 1.7 KHz filter with at least 4 dB ripple in the pass band.
I have tried 220pF and 270pF.
So, I started testing transformers.  I set up the SA with a Directional Coupler to measure Reflection Cooef.
Thus SWR.   I tried winding different transformers.   At 12 MHz, the best SWR I could get was 1.6 :1?
Bifilar twisted around a toroid, and used full transformer (isolated not auto connection) with a 47 Ohm SM
on the output.  With an SMA 50 Ohm Dummy I get reflection of -22 dB (really good).  With the transformer
setup I get about 12-13 (SWR 1.6).

Is this the best it gets?   How should I otherwise match my crystal filter.   Is that causing the ripple.
I thought I was driving the filter with about 200 Ohms?

What say the real RF guys?

Thanks, Mike, WA6ISP
 

 
-- 
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: rv2- messed up setting and txing like mad!!!

Alan -MMØWXT
 

ok wonderful people...here is what I have done.

1. I hooked up the raduino to pc and checked volts, all good.
2. Disconnected  pa power turned rv1,2,3 all fully clockwise (towards metal dot on pot?), cut of cw mic connector snd bridged green and blue with 4.7k resistor.


Zero volts on KT1 pad and 250ma draw on receive. No raduino going mad. So as sugested PA POWER.
3. Setup ammeter to measure current. Hoked up pa. Current 170, smoke coming i think from first 
Irf510. It was hot, rightside irf520 cold. Rig only on 2-3 secs.

Desoldered irf 520, replaced with new.

Still to switch on......eeeek!

All my pots are turned fully rightwards (clockwise)

Todo:hookup ammeter and power with thicker jumpers(melty on switchon!),

May God bless all who sail in Her....:-)

Thanks

Alan